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tvl-depot/third_party/git/compat/mingw.c
Vincent Ambo f4609b896f merge(3p/git): Merge git subtree at v2.29.2 
This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb
2020-11-21 19:45:56 +01:00

2903 lines
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#include "../git-compat-util.h"
#include "win32.h"
#include <conio.h>
#include <wchar.h>
#include "../strbuf.h"
#include "../run-command.h"
#include "../cache.h"
#include "win32/lazyload.h"
#include "../config.h"
#include "dir.h"
#define HCAST(type, handle) ((type)(intptr_t)handle)
static const int delay[] = { 0, 1, 10, 20, 40 };
void open_in_gdb(void)
{
static struct child_process cp = CHILD_PROCESS_INIT;
extern char *_pgmptr;
strvec_pushl(&cp.args, "mintty", "gdb", NULL);
strvec_pushf(&cp.args, "--pid=%d", getpid());
cp.clean_on_exit = 1;
if (start_command(&cp) < 0)
die_errno("Could not start gdb");
sleep(1);
}
int err_win_to_posix(DWORD winerr)
{
int error = ENOSYS;
switch(winerr) {
case ERROR_ACCESS_DENIED: error = EACCES; break;
case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
case ERROR_ALREADY_EXISTS: error = EEXIST; break;
case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
case ERROR_BAD_COMMAND: error = EIO; break;
case ERROR_BAD_DEVICE: error = ENODEV; break;
case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
case ERROR_BAD_FORMAT: error = ENOEXEC; break;
case ERROR_BAD_LENGTH: error = EINVAL; break;
case ERROR_BAD_PATHNAME: error = ENOENT; break;
case ERROR_BAD_PIPE: error = EPIPE; break;
case ERROR_BAD_UNIT: error = ENODEV; break;
case ERROR_BAD_USERNAME: error = EINVAL; break;
case ERROR_BROKEN_PIPE: error = EPIPE; break;
case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
case ERROR_BUSY: error = EBUSY; break;
case ERROR_BUSY_DRIVE: error = EBUSY; break;
case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
case ERROR_CANNOT_MAKE: error = EACCES; break;
case ERROR_CANTOPEN: error = EIO; break;
case ERROR_CANTREAD: error = EIO; break;
case ERROR_CANTWRITE: error = EIO; break;
case ERROR_CRC: error = EIO; break;
case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
case ERROR_DEVICE_IN_USE: error = EBUSY; break;
case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
case ERROR_DIRECTORY: error = EINVAL; break;
case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
case ERROR_DISK_CHANGE: error = EIO; break;
case ERROR_DISK_FULL: error = ENOSPC; break;
case ERROR_DRIVE_LOCKED: error = EBUSY; break;
case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
case ERROR_FILE_EXISTS: error = EEXIST; break;
case ERROR_FILE_INVALID: error = ENODEV; break;
case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
case ERROR_GEN_FAILURE: error = EIO; break;
case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
case ERROR_INVALID_ACCESS: error = EACCES; break;
case ERROR_INVALID_ADDRESS: error = EFAULT; break;
case ERROR_INVALID_BLOCK: error = EFAULT; break;
case ERROR_INVALID_DATA: error = EINVAL; break;
case ERROR_INVALID_DRIVE: error = ENODEV; break;
case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
case ERROR_INVALID_FLAGS: error = EINVAL; break;
case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
case ERROR_INVALID_HANDLE: error = EBADF; break;
case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
case ERROR_INVALID_NAME: error = EINVAL; break;
case ERROR_INVALID_OWNER: error = EINVAL; break;
case ERROR_INVALID_PARAMETER: error = EINVAL; break;
case ERROR_INVALID_PASSWORD: error = EPERM; break;
case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
case ERROR_INVALID_WORKSTATION: error = EACCES; break;
case ERROR_IO_DEVICE: error = EIO; break;
case ERROR_IO_INCOMPLETE: error = EINTR; break;
case ERROR_LOCKED: error = EBUSY; break;
case ERROR_LOCK_VIOLATION: error = EACCES; break;
case ERROR_LOGON_FAILURE: error = EACCES; break;
case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
case ERROR_MORE_DATA: error = EPIPE; break;
case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
case ERROR_NOACCESS: error = EFAULT; break;
case ERROR_NONE_MAPPED: error = EINVAL; break;
case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
case ERROR_NOT_READY: error = EAGAIN; break;
case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
case ERROR_NO_DATA: error = EPIPE; break;
case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
case ERROR_OPEN_FAILED: error = EIO; break;
case ERROR_OPEN_FILES: error = EBUSY; break;
case ERROR_OPERATION_ABORTED: error = EINTR; break;
case ERROR_OUTOFMEMORY: error = ENOMEM; break;
case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
case ERROR_PATH_BUSY: error = EBUSY; break;
case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
case ERROR_PIPE_BUSY: error = EBUSY; break;
case ERROR_PIPE_CONNECTED: error = EPIPE; break;
case ERROR_PIPE_LISTENING: error = EPIPE; break;
case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
case ERROR_READ_FAULT: error = EIO; break;
case ERROR_SEEK: error = EIO; break;
case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
case ERROR_SHARING_VIOLATION: error = EACCES; break;
case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
case ERROR_SUCCESS: BUG("err_win_to_posix() called without an error!");
case ERROR_SWAPERROR: error = ENOENT; break;
case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
case ERROR_WRITE_FAULT: error = EIO; break;
case ERROR_WRITE_PROTECT: error = EROFS; break;
}
return error;
}
static inline int is_file_in_use_error(DWORD errcode)
{
switch (errcode) {
case ERROR_SHARING_VIOLATION:
case ERROR_ACCESS_DENIED:
return 1;
}
return 0;
}
static int read_yes_no_answer(void)
{
char answer[1024];
if (fgets(answer, sizeof(answer), stdin)) {
size_t answer_len = strlen(answer);
int got_full_line = 0, c;
/* remove the newline */
if (answer_len >= 2 && answer[answer_len-2] == '\r') {
answer[answer_len-2] = '\0';
got_full_line = 1;
} else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
answer[answer_len-1] = '\0';
got_full_line = 1;
}
/* flush the buffer in case we did not get the full line */
if (!got_full_line)
while ((c = getchar()) != EOF && c != '\n')
;
} else
/* we could not read, return the
* default answer which is no */
return 0;
if (tolower(answer[0]) == 'y' && !answer[1])
return 1;
if (!strncasecmp(answer, "yes", sizeof(answer)))
return 1;
if (tolower(answer[0]) == 'n' && !answer[1])
return 0;
if (!strncasecmp(answer, "no", sizeof(answer)))
return 0;
/* did not find an answer we understand */
return -1;
}
static int ask_yes_no_if_possible(const char *format, ...)
{
char question[4096];
const char *retry_hook[] = { NULL, NULL, NULL };
va_list args;
va_start(args, format);
vsnprintf(question, sizeof(question), format, args);
va_end(args);
if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
retry_hook[1] = question;
return !run_command_v_opt(retry_hook, 0);
}
if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
return 0;
while (1) {
int answer;
fprintf(stderr, "%s (y/n) ", question);
if ((answer = read_yes_no_answer()) >= 0)
return answer;
fprintf(stderr, "Sorry, I did not understand your answer. "
"Please type 'y' or 'n'\n");
}
}
/* Windows only */
enum hide_dotfiles_type {
HIDE_DOTFILES_FALSE = 0,
HIDE_DOTFILES_TRUE,
HIDE_DOTFILES_DOTGITONLY
};
static int core_restrict_inherited_handles = -1;
static enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
static char *unset_environment_variables;
int mingw_core_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "core.hidedotfiles")) {
if (value && !strcasecmp(value, "dotgitonly"))
hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
else
hide_dotfiles = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "core.unsetenvvars")) {
free(unset_environment_variables);
unset_environment_variables = xstrdup(value);
return 0;
}
if (!strcmp(var, "core.restrictinheritedhandles")) {
if (value && !strcasecmp(value, "auto"))
core_restrict_inherited_handles = -1;
else
core_restrict_inherited_handles =
git_config_bool(var, value);
return 0;
}
return 0;
}
/* Normalizes NT paths as returned by some low-level APIs. */
static wchar_t *normalize_ntpath(wchar_t *wbuf)
{
int i;
/* fix absolute path prefixes */
if (wbuf[0] == '\\') {
/* strip NT namespace prefixes */
if (!wcsncmp(wbuf, L"\\??\\", 4) ||
!wcsncmp(wbuf, L"\\\\?\\", 4))
wbuf += 4;
else if (!wcsnicmp(wbuf, L"\\DosDevices\\", 12))
wbuf += 12;
/* replace remaining '...UNC\' with '\\' */
if (!wcsnicmp(wbuf, L"UNC\\", 4)) {
wbuf += 2;
*wbuf = '\\';
}
}
/* convert backslashes to slashes */
for (i = 0; wbuf[i]; i++)
if (wbuf[i] == '\\')
wbuf[i] = '/';
return wbuf;
}
int mingw_unlink(const char *pathname)
{
int ret, tries = 0;
wchar_t wpathname[MAX_PATH];
if (xutftowcs_path(wpathname, pathname) < 0)
return -1;
if (DeleteFileW(wpathname))
return 0;
/* read-only files cannot be removed */
_wchmod(wpathname, 0666);
while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
if (!is_file_in_use_error(GetLastError()))
break;
/*
* We assume that some other process had the source or
* destination file open at the wrong moment and retry.
* In order to give the other process a higher chance to
* complete its operation, we give up our time slice now.
* If we have to retry again, we do sleep a bit.
*/
Sleep(delay[tries]);
tries++;
}
while (ret == -1 && is_file_in_use_error(GetLastError()) &&
ask_yes_no_if_possible("Unlink of file '%s' failed. "
"Should I try again?", pathname))
ret = _wunlink(wpathname);
return ret;
}
static int is_dir_empty(const wchar_t *wpath)
{
WIN32_FIND_DATAW findbuf;
HANDLE handle;
wchar_t wbuf[MAX_PATH + 2];
wcscpy(wbuf, wpath);
wcscat(wbuf, L"\\*");
handle = FindFirstFileW(wbuf, &findbuf);
if (handle == INVALID_HANDLE_VALUE)
return GetLastError() == ERROR_NO_MORE_FILES;
while (!wcscmp(findbuf.cFileName, L".") ||
!wcscmp(findbuf.cFileName, L".."))
if (!FindNextFileW(handle, &findbuf)) {
DWORD err = GetLastError();
FindClose(handle);
return err == ERROR_NO_MORE_FILES;
}
FindClose(handle);
return 0;
}
int mingw_rmdir(const char *pathname)
{
int ret, tries = 0;
wchar_t wpathname[MAX_PATH];
if (xutftowcs_path(wpathname, pathname) < 0)
return -1;
while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
if (!is_file_in_use_error(GetLastError()))
errno = err_win_to_posix(GetLastError());
if (errno != EACCES)
break;
if (!is_dir_empty(wpathname)) {
errno = ENOTEMPTY;
break;
}
/*
* We assume that some other process had the source or
* destination file open at the wrong moment and retry.
* In order to give the other process a higher chance to
* complete its operation, we give up our time slice now.
* If we have to retry again, we do sleep a bit.
*/
Sleep(delay[tries]);
tries++;
}
while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
ask_yes_no_if_possible("Deletion of directory '%s' failed. "
"Should I try again?", pathname))
ret = _wrmdir(wpathname);
return ret;
}
static inline int needs_hiding(const char *path)
{
const char *basename;
if (hide_dotfiles == HIDE_DOTFILES_FALSE)
return 0;
/* We cannot use basename(), as it would remove trailing slashes */
win32_skip_dos_drive_prefix((char **)&path);
if (!*path)
return 0;
for (basename = path; *path; path++)
if (is_dir_sep(*path)) {
do {
path++;
} while (is_dir_sep(*path));
/* ignore trailing slashes */
if (*path)
basename = path;
else
break;
}
if (hide_dotfiles == HIDE_DOTFILES_TRUE)
return *basename == '.';
assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
return !strncasecmp(".git", basename, 4) &&
(!basename[4] || is_dir_sep(basename[4]));
}
static int set_hidden_flag(const wchar_t *path, int set)
{
DWORD original = GetFileAttributesW(path), modified;
if (set)
modified = original | FILE_ATTRIBUTE_HIDDEN;
else
modified = original & ~FILE_ATTRIBUTE_HIDDEN;
if (original == modified || SetFileAttributesW(path, modified))
return 0;
errno = err_win_to_posix(GetLastError());
return -1;
}
int mingw_mkdir(const char *path, int mode)
{
int ret;
wchar_t wpath[MAX_PATH];
if (!is_valid_win32_path(path, 0)) {
errno = EINVAL;
return -1;
}
if (xutftowcs_path(wpath, path) < 0)
return -1;
ret = _wmkdir(wpath);
if (!ret && needs_hiding(path))
return set_hidden_flag(wpath, 1);
return ret;
}
/*
* Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
* is documented in [1] as opening a writable file handle in append mode.
* (It is believed that) this is atomic since it is maintained by the
* kernel unlike the O_APPEND flag which is racily maintained by the CRT.
*
* [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
*
* This trick does not appear to work for named pipes. Instead it creates
* a named pipe client handle that cannot be written to. Callers should
* just use the regular _wopen() for them. (And since client handle gets
* bound to a unique server handle, it isn't really an issue.)
*/
static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
{
HANDLE handle;
int fd;
DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
/* only these flags are supported */
if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
return errno = ENOSYS, -1;
/*
* FILE_SHARE_WRITE is required to permit child processes
* to append to the file.
*/
handle = CreateFileW(wfilename, FILE_APPEND_DATA,
FILE_SHARE_WRITE | FILE_SHARE_READ,
NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
if (handle == INVALID_HANDLE_VALUE) {
DWORD err = GetLastError();
/*
* Some network storage solutions (e.g. Isilon) might return
* ERROR_INVALID_PARAMETER instead of expected error
* ERROR_PATH_NOT_FOUND, which results in an unknown error. If
* so, let's turn the error to ERROR_PATH_NOT_FOUND instead.
*/
if (err == ERROR_INVALID_PARAMETER)
err = ERROR_PATH_NOT_FOUND;
errno = err_win_to_posix(err);
return -1;
}
/*
* No O_APPEND here, because the CRT uses it only to reset the
* file pointer to EOF before each write(); but that is not
* necessary (and may lead to races) for a file created with
* FILE_APPEND_DATA.
*/
fd = _open_osfhandle((intptr_t)handle, O_BINARY);
if (fd < 0)
CloseHandle(handle);
return fd;
}
/*
* Does the pathname map to the local named pipe filesystem?
* That is, does it have a "//./pipe/" prefix?
*/
static int is_local_named_pipe_path(const char *filename)
{
return (is_dir_sep(filename[0]) &&
is_dir_sep(filename[1]) &&
filename[2] == '.' &&
is_dir_sep(filename[3]) &&
!strncasecmp(filename+4, "pipe", 4) &&
is_dir_sep(filename[8]) &&
filename[9]);
}
int mingw_open (const char *filename, int oflags, ...)
{
typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
va_list args;
unsigned mode;
int fd, create = (oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL);
wchar_t wfilename[MAX_PATH];
open_fn_t open_fn;
va_start(args, oflags);
mode = va_arg(args, int);
va_end(args);
if (!is_valid_win32_path(filename, !create)) {
errno = create ? EINVAL : ENOENT;
return -1;
}
if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
open_fn = mingw_open_append;
else
open_fn = _wopen;
if (filename && !strcmp(filename, "/dev/null"))
wcscpy(wfilename, L"nul");
else if (xutftowcs_path(wfilename, filename) < 0)
return -1;
fd = open_fn(wfilename, oflags, mode);
if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
DWORD attrs = GetFileAttributesW(wfilename);
if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
errno = EISDIR;
}
if ((oflags & O_CREAT) && needs_hiding(filename)) {
/*
* Internally, _wopen() uses the CreateFile() API which errors
* out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
* specified and an already existing file's attributes do not
* match *exactly*. As there is no mode or flag we can set that
* would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
* again *without* the O_CREAT flag (that corresponds to the
* CREATE_ALWAYS flag of CreateFile()).
*/
if (fd < 0 && errno == EACCES)
fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
if (fd >= 0 && set_hidden_flag(wfilename, 1))
warning("could not mark '%s' as hidden.", filename);
}
return fd;
}
static BOOL WINAPI ctrl_ignore(DWORD type)
{
return TRUE;
}
#undef fgetc
int mingw_fgetc(FILE *stream)
{
int ch;
if (!isatty(_fileno(stream)))
return fgetc(stream);
SetConsoleCtrlHandler(ctrl_ignore, TRUE);
while (1) {
ch = fgetc(stream);
if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
break;
/* Ctrl+C was pressed, simulate SIGINT and retry */
mingw_raise(SIGINT);
}
SetConsoleCtrlHandler(ctrl_ignore, FALSE);
return ch;
}
#undef fopen
FILE *mingw_fopen (const char *filename, const char *otype)
{
int hide = needs_hiding(filename);
FILE *file;
wchar_t wfilename[MAX_PATH], wotype[4];
if (filename && !strcmp(filename, "/dev/null"))
wcscpy(wfilename, L"nul");
else if (!is_valid_win32_path(filename, 1)) {
int create = otype && strchr(otype, 'w');
errno = create ? EINVAL : ENOENT;
return NULL;
} else if (xutftowcs_path(wfilename, filename) < 0)
return NULL;
if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
return NULL;
if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
error("could not unhide %s", filename);
return NULL;
}
file = _wfopen(wfilename, wotype);
if (!file && GetLastError() == ERROR_INVALID_NAME)
errno = ENOENT;
if (file && hide && set_hidden_flag(wfilename, 1))
warning("could not mark '%s' as hidden.", filename);
return file;
}
FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
{
int hide = needs_hiding(filename);
FILE *file;
wchar_t wfilename[MAX_PATH], wotype[4];
if (filename && !strcmp(filename, "/dev/null"))
wcscpy(wfilename, L"nul");
else if (!is_valid_win32_path(filename, 1)) {
int create = otype && strchr(otype, 'w');
errno = create ? EINVAL : ENOENT;
return NULL;
} else if (xutftowcs_path(wfilename, filename) < 0)
return NULL;
if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
return NULL;
if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
error("could not unhide %s", filename);
return NULL;
}
file = _wfreopen(wfilename, wotype, stream);
if (file && hide && set_hidden_flag(wfilename, 1))
warning("could not mark '%s' as hidden.", filename);
return file;
}
#undef fflush
int mingw_fflush(FILE *stream)
{
int ret = fflush(stream);
/*
* write() is used behind the scenes of stdio output functions.
* Since git code does not check for errors after each stdio write
* operation, it can happen that write() is called by a later
* stdio function even if an earlier write() call failed. In the
* case of a pipe whose readable end was closed, only the first
* call to write() reports EPIPE on Windows. Subsequent write()
* calls report EINVAL. It is impossible to notice whether this
* fflush invocation triggered such a case, therefore, we have to
* catch all EINVAL errors whole-sale.
*/
if (ret && errno == EINVAL)
errno = EPIPE;
return ret;
}
#undef write
ssize_t mingw_write(int fd, const void *buf, size_t len)
{
ssize_t result = write(fd, buf, len);
if (result < 0 && errno == EINVAL && buf) {
/* check if fd is a pipe */
HANDLE h = (HANDLE) _get_osfhandle(fd);
if (GetFileType(h) == FILE_TYPE_PIPE)
errno = EPIPE;
else
errno = EINVAL;
}
return result;
}
int mingw_access(const char *filename, int mode)
{
wchar_t wfilename[MAX_PATH];
if (xutftowcs_path(wfilename, filename) < 0)
return -1;
/* X_OK is not supported by the MSVCRT version */
return _waccess(wfilename, mode & ~X_OK);
}
int mingw_chdir(const char *dirname)
{
wchar_t wdirname[MAX_PATH];
if (xutftowcs_path(wdirname, dirname) < 0)
return -1;
return _wchdir(wdirname);
}
int mingw_chmod(const char *filename, int mode)
{
wchar_t wfilename[MAX_PATH];
if (xutftowcs_path(wfilename, filename) < 0)
return -1;
return _wchmod(wfilename, mode);
}
/*
* The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
* Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
*/
static inline long long filetime_to_hnsec(const FILETIME *ft)
{
long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
/* Windows to Unix Epoch conversion */
return winTime - 116444736000000000LL;
}
static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
{
long long hnsec = filetime_to_hnsec(ft);
ts->tv_sec = (time_t)(hnsec / 10000000);
ts->tv_nsec = (hnsec % 10000000) * 100;
}
/**
* Verifies that safe_create_leading_directories() would succeed.
*/
static int has_valid_directory_prefix(wchar_t *wfilename)
{
int n = wcslen(wfilename);
while (n > 0) {
wchar_t c = wfilename[--n];
DWORD attributes;
if (!is_dir_sep(c))
continue;
wfilename[n] = L'\0';
attributes = GetFileAttributesW(wfilename);
wfilename[n] = c;
if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
attributes == FILE_ATTRIBUTE_DEVICE)
return 1;
if (attributes == INVALID_FILE_ATTRIBUTES)
switch (GetLastError()) {
case ERROR_PATH_NOT_FOUND:
continue;
case ERROR_FILE_NOT_FOUND:
/* This implies parent directory exists. */
return 1;
}
return 0;
}
return 1;
}
/* We keep the do_lstat code in a separate function to avoid recursion.
* When a path ends with a slash, the stat will fail with ENOENT. In
* this case, we strip the trailing slashes and stat again.
*
* If follow is true then act like stat() and report on the link
* target. Otherwise report on the link itself.
*/
static int do_lstat(int follow, const char *file_name, struct stat *buf)
{
WIN32_FILE_ATTRIBUTE_DATA fdata;
wchar_t wfilename[MAX_PATH];
if (xutftowcs_path(wfilename, file_name) < 0)
return -1;
if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
buf->st_ino = 0;
buf->st_gid = 0;
buf->st_uid = 0;
buf->st_nlink = 1;
buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
buf->st_size = fdata.nFileSizeLow |
(((off_t)fdata.nFileSizeHigh)<<32);
buf->st_dev = buf->st_rdev = 0; /* not used by Git */
filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
WIN32_FIND_DATAW findbuf;
HANDLE handle = FindFirstFileW(wfilename, &findbuf);
if (handle != INVALID_HANDLE_VALUE) {
if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
(findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
if (follow) {
char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
} else {
buf->st_mode = S_IFLNK;
}
buf->st_mode |= S_IREAD;
if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
buf->st_mode |= S_IWRITE;
}
FindClose(handle);
}
}
return 0;
}
switch (GetLastError()) {
case ERROR_ACCESS_DENIED:
case ERROR_SHARING_VIOLATION:
case ERROR_LOCK_VIOLATION:
case ERROR_SHARING_BUFFER_EXCEEDED:
errno = EACCES;
break;
case ERROR_BUFFER_OVERFLOW:
errno = ENAMETOOLONG;
break;
case ERROR_NOT_ENOUGH_MEMORY:
errno = ENOMEM;
break;
case ERROR_PATH_NOT_FOUND:
if (!has_valid_directory_prefix(wfilename)) {
errno = ENOTDIR;
break;
}
/* fallthru */
default:
errno = ENOENT;
break;
}
return -1;
}
/* We provide our own lstat/fstat functions, since the provided
* lstat/fstat functions are so slow. These stat functions are
* tailored for Git's usage (read: fast), and are not meant to be
* complete. Note that Git stat()s are redirected to mingw_lstat()
* too, since Windows doesn't really handle symlinks that well.
*/
static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
{
int namelen;
char alt_name[PATH_MAX];
if (!do_lstat(follow, file_name, buf))
return 0;
/* if file_name ended in a '/', Windows returned ENOENT;
* try again without trailing slashes
*/
if (errno != ENOENT)
return -1;
namelen = strlen(file_name);
if (namelen && file_name[namelen-1] != '/')
return -1;
while (namelen && file_name[namelen-1] == '/')
--namelen;
if (!namelen || namelen >= PATH_MAX)
return -1;
memcpy(alt_name, file_name, namelen);
alt_name[namelen] = 0;
return do_lstat(follow, alt_name, buf);
}
static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
{
BY_HANDLE_FILE_INFORMATION fdata;
if (!GetFileInformationByHandle(hnd, &fdata)) {
errno = err_win_to_posix(GetLastError());
return -1;
}
buf->st_ino = 0;
buf->st_gid = 0;
buf->st_uid = 0;
buf->st_nlink = 1;
buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
buf->st_size = fdata.nFileSizeLow |
(((off_t)fdata.nFileSizeHigh)<<32);
buf->st_dev = buf->st_rdev = 0; /* not used by Git */
filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
return 0;
}
int mingw_lstat(const char *file_name, struct stat *buf)
{
return do_stat_internal(0, file_name, buf);
}
int mingw_stat(const char *file_name, struct stat *buf)
{
return do_stat_internal(1, file_name, buf);
}
int mingw_fstat(int fd, struct stat *buf)
{
HANDLE fh = (HANDLE)_get_osfhandle(fd);
DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
switch (type) {
case FILE_TYPE_DISK:
return get_file_info_by_handle(fh, buf);
case FILE_TYPE_CHAR:
case FILE_TYPE_PIPE:
/* initialize stat fields */
memset(buf, 0, sizeof(*buf));
buf->st_nlink = 1;
if (type == FILE_TYPE_CHAR) {
buf->st_mode = _S_IFCHR;
} else {
buf->st_mode = _S_IFIFO;
if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
buf->st_size = avail;
}
return 0;
default:
errno = EBADF;
return -1;
}
}
static inline void time_t_to_filetime(time_t t, FILETIME *ft)
{
long long winTime = t * 10000000LL + 116444736000000000LL;
ft->dwLowDateTime = winTime;
ft->dwHighDateTime = winTime >> 32;
}
int mingw_utime (const char *file_name, const struct utimbuf *times)
{
FILETIME mft, aft;
int fh, rc;
DWORD attrs;
wchar_t wfilename[MAX_PATH];
if (xutftowcs_path(wfilename, file_name) < 0)
return -1;
/* must have write permission */
attrs = GetFileAttributesW(wfilename);
if (attrs != INVALID_FILE_ATTRIBUTES &&
(attrs & FILE_ATTRIBUTE_READONLY)) {
/* ignore errors here; open() will report them */
SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
}
if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
rc = -1;
goto revert_attrs;
}
if (times) {
time_t_to_filetime(times->modtime, &mft);
time_t_to_filetime(times->actime, &aft);
} else {
GetSystemTimeAsFileTime(&mft);
aft = mft;
}
if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
errno = EINVAL;
rc = -1;
} else
rc = 0;
close(fh);
revert_attrs:
if (attrs != INVALID_FILE_ATTRIBUTES &&
(attrs & FILE_ATTRIBUTE_READONLY)) {
/* ignore errors again */
SetFileAttributesW(wfilename, attrs);
}
return rc;
}
#undef strftime
size_t mingw_strftime(char *s, size_t max,
const char *format, const struct tm *tm)
{
/* a pointer to the original strftime in case we can't find the UCRT version */
static size_t (*fallback)(char *, size_t, const char *, const struct tm *) = strftime;
size_t ret;
DECLARE_PROC_ADDR(ucrtbase.dll, size_t, strftime, char *, size_t,
const char *, const struct tm *);
if (INIT_PROC_ADDR(strftime))
ret = strftime(s, max, format, tm);
else
ret = fallback(s, max, format, tm);
if (!ret && errno == EINVAL)
die("invalid strftime format: '%s'", format);
return ret;
}
unsigned int sleep (unsigned int seconds)
{
Sleep(seconds*1000);
return 0;
}
char *mingw_mktemp(char *template)
{
wchar_t wtemplate[MAX_PATH];
if (xutftowcs_path(wtemplate, template) < 0)
return NULL;
if (!_wmktemp(wtemplate))
return NULL;
if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
return NULL;
return template;
}
int mkstemp(char *template)
{
char *filename = mktemp(template);
if (filename == NULL)
return -1;
return open(filename, O_RDWR | O_CREAT, 0600);
}
int gettimeofday(struct timeval *tv, void *tz)
{
FILETIME ft;
long long hnsec;
GetSystemTimeAsFileTime(&ft);
hnsec = filetime_to_hnsec(&ft);
tv->tv_sec = hnsec / 10000000;
tv->tv_usec = (hnsec % 10000000) / 10;
return 0;
}
int pipe(int filedes[2])
{
HANDLE h[2];
/* this creates non-inheritable handles */
if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
errno = err_win_to_posix(GetLastError());
return -1;
}
filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
if (filedes[0] < 0) {
CloseHandle(h[0]);
CloseHandle(h[1]);
return -1;
}
filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
if (filedes[1] < 0) {
close(filedes[0]);
CloseHandle(h[1]);
return -1;
}
return 0;
}
struct tm *gmtime_r(const time_t *timep, struct tm *result)
{
if (gmtime_s(result, timep) == 0)
return result;
return NULL;
}
struct tm *localtime_r(const time_t *timep, struct tm *result)
{
if (localtime_s(result, timep) == 0)
return result;
return NULL;
}
char *mingw_getcwd(char *pointer, int len)
{
wchar_t cwd[MAX_PATH], wpointer[MAX_PATH];
DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd);
if (!ret || ret >= ARRAY_SIZE(cwd)) {
errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError());
return NULL;
}
ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer));
if (!ret && GetLastError() == ERROR_ACCESS_DENIED) {
HANDLE hnd = CreateFileW(cwd, 0,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
if (hnd == INVALID_HANDLE_VALUE)
return NULL;
ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0);
CloseHandle(hnd);
if (!ret || ret >= ARRAY_SIZE(wpointer))
return NULL;
if (xwcstoutf(pointer, normalize_ntpath(wpointer), len) < 0)
return NULL;
return pointer;
}
if (!ret || ret >= ARRAY_SIZE(wpointer))
return NULL;
if (xwcstoutf(pointer, wpointer, len) < 0)
return NULL;
convert_slashes(pointer);
return pointer;
}
/*
* See "Parsing C++ Command-Line Arguments" at Microsoft's Docs:
* https://docs.microsoft.com/en-us/cpp/cpp/parsing-cpp-command-line-arguments
*/
static const char *quote_arg_msvc(const char *arg)
{
/* count chars to quote */
int len = 0, n = 0;
int force_quotes = 0;
char *q, *d;
const char *p = arg;
if (!*p) force_quotes = 1;
while (*p) {
if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
force_quotes = 1;
else if (*p == '"')
n++;
else if (*p == '\\') {
int count = 0;
while (*p == '\\') {
count++;
p++;
len++;
}
if (*p == '"' || !*p)
n += count*2 + 1;
continue;
}
len++;
p++;
}
if (!force_quotes && n == 0)
return arg;
/* insert \ where necessary */
d = q = xmalloc(st_add3(len, n, 3));
*d++ = '"';
while (*arg) {
if (*arg == '"')
*d++ = '\\';
else if (*arg == '\\') {
int count = 0;
while (*arg == '\\') {
count++;
*d++ = *arg++;
}
if (*arg == '"' || !*arg) {
while (count-- > 0)
*d++ = '\\';
/* don't escape the surrounding end quote */
if (!*arg)
break;
*d++ = '\\';
}
}
*d++ = *arg++;
}
*d++ = '"';
*d++ = '\0';
return q;
}
#include "quote.h"
static const char *quote_arg_msys2(const char *arg)
{
struct strbuf buf = STRBUF_INIT;
const char *p2 = arg, *p;
for (p = arg; *p; p++) {
int ws = isspace(*p);
if (!ws && *p != '\\' && *p != '"' && *p != '{' && *p != '\'' &&
*p != '?' && *p != '*' && *p != '~')
continue;
if (!buf.len)
strbuf_addch(&buf, '"');
if (p != p2)
strbuf_add(&buf, p2, p - p2);
if (*p == '\\' || *p == '"')
strbuf_addch(&buf, '\\');
p2 = p;
}
if (p == arg)
strbuf_addch(&buf, '"');
else if (!buf.len)
return arg;
else
strbuf_add(&buf, p2, p - p2);
strbuf_addch(&buf, '"');
return strbuf_detach(&buf, 0);
}
static const char *parse_interpreter(const char *cmd)
{
static char buf[100];
char *p, *opt;
int n, fd;
/* don't even try a .exe */
n = strlen(cmd);
if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
return NULL;
fd = open(cmd, O_RDONLY);
if (fd < 0)
return NULL;
n = read(fd, buf, sizeof(buf)-1);
close(fd);
if (n < 4) /* at least '#!/x' and not error */
return NULL;
if (buf[0] != '#' || buf[1] != '!')
return NULL;
buf[n] = '\0';
p = buf + strcspn(buf, "\r\n");
if (!*p)
return NULL;
*p = '\0';
if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
return NULL;
/* strip options */
if ((opt = strchr(p+1, ' ')))
*opt = '\0';
return p+1;
}
/*
* exe_only means that we only want to detect .exe files, but not scripts
* (which do not have an extension)
*/
static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
int isexe, int exe_only)
{
char path[MAX_PATH];
wchar_t wpath[MAX_PATH];
snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
if (xutftowcs_path(wpath, path) < 0)
return NULL;
if (!isexe && _waccess(wpath, F_OK) == 0)
return xstrdup(path);
wpath[wcslen(wpath)-4] = '\0';
if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY)) {
path[strlen(path)-4] = '\0';
return xstrdup(path);
}
}
return NULL;
}
/*
* Determines the absolute path of cmd using the split path in path.
* If cmd contains a slash or backslash, no lookup is performed.
*/
static char *path_lookup(const char *cmd, int exe_only)
{
const char *path;
char *prog = NULL;
int len = strlen(cmd);
int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
if (strpbrk(cmd, "/\\"))
return xstrdup(cmd);
path = mingw_getenv("PATH");
if (!path)
return NULL;
while (!prog) {
const char *sep = strchrnul(path, ';');
int dirlen = sep - path;
if (dirlen)
prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
if (!*sep)
break;
path = sep + 1;
}
return prog;
}
static const wchar_t *wcschrnul(const wchar_t *s, wchar_t c)
{
while (*s && *s != c)
s++;
return s;
}
/* Compare only keys */
static int wenvcmp(const void *a, const void *b)
{
wchar_t *p = *(wchar_t **)a, *q = *(wchar_t **)b;
size_t p_len, q_len;
/* Find the keys */
p_len = wcschrnul(p, L'=') - p;
q_len = wcschrnul(q, L'=') - q;
/* If the length differs, include the shorter key's NUL */
if (p_len < q_len)
p_len++;
else if (p_len > q_len)
p_len = q_len + 1;
return _wcsnicmp(p, q, p_len);
}
/*
* Build an environment block combining the inherited environment
* merged with the given list of settings.
*
* Values of the form "KEY=VALUE" in deltaenv override inherited values.
* Values of the form "KEY" in deltaenv delete inherited values.
*
* Multiple entries in deltaenv for the same key are explicitly allowed.
*
* We return a contiguous block of UNICODE strings with a final trailing
* zero word.
*/
static wchar_t *make_environment_block(char **deltaenv)
{
wchar_t *wenv = GetEnvironmentStringsW(), *wdeltaenv, *result, *p;
size_t wlen, s, delta_size, size;
wchar_t **array = NULL;
size_t alloc = 0, nr = 0, i;
size = 1; /* for extra NUL at the end */
/* If there is no deltaenv to apply, simply return a copy. */
if (!deltaenv || !*deltaenv) {
for (p = wenv; p && *p; ) {
size_t s = wcslen(p) + 1;
size += s;
p += s;
}
ALLOC_ARRAY(result, size);
COPY_ARRAY(result, wenv, size);
FreeEnvironmentStringsW(wenv);
return result;
}
/*
* If there is a deltaenv, let's accumulate all keys into `array`,
* sort them using the stable git_stable_qsort() and then copy,
* skipping duplicate keys
*/
for (p = wenv; p && *p; ) {
ALLOC_GROW(array, nr + 1, alloc);
s = wcslen(p) + 1;
array[nr++] = p;
p += s;
size += s;
}
/* (over-)assess size needed for wchar version of deltaenv */
for (delta_size = 0, i = 0; deltaenv[i]; i++)
delta_size += strlen(deltaenv[i]) * 2 + 1;
ALLOC_ARRAY(wdeltaenv, delta_size);
/* convert the deltaenv, appending to array */
for (i = 0, p = wdeltaenv; deltaenv[i]; i++) {
ALLOC_GROW(array, nr + 1, alloc);
wlen = xutftowcs(p, deltaenv[i], wdeltaenv + delta_size - p);
array[nr++] = p;
p += wlen + 1;
}
git_stable_qsort(array, nr, sizeof(*array), wenvcmp);
ALLOC_ARRAY(result, size + delta_size);
for (p = result, i = 0; i < nr; i++) {
/* Skip any duplicate keys; last one wins */
while (i + 1 < nr && !wenvcmp(array + i, array + i + 1))
i++;
/* Skip "to delete" entry */
if (!wcschr(array[i], L'='))
continue;
size = wcslen(array[i]) + 1;
COPY_ARRAY(p, array[i], size);
p += size;
}
*p = L'\0';
free(array);
free(wdeltaenv);
FreeEnvironmentStringsW(wenv);
return result;
}
static void do_unset_environment_variables(void)
{
static int done;
char *p = unset_environment_variables;
if (done || !p)
return;
done = 1;
for (;;) {
char *comma = strchr(p, ',');
if (comma)
*comma = '\0';
unsetenv(p);
if (!comma)
break;
p = comma + 1;
}
}
struct pinfo_t {
struct pinfo_t *next;
pid_t pid;
HANDLE proc;
};
static struct pinfo_t *pinfo = NULL;
CRITICAL_SECTION pinfo_cs;
/* Used to match and chomp off path components */
static inline int match_last_path_component(const char *path, size_t *len,
const char *component)
{
size_t component_len = strlen(component);
if (*len < component_len + 1 ||
!is_dir_sep(path[*len - component_len - 1]) ||
fspathncmp(path + *len - component_len, component, component_len))
return 0;
*len -= component_len + 1;
/* chomp off repeated dir separators */
while (*len > 0 && is_dir_sep(path[*len - 1]))
(*len)--;
return 1;
}
static int is_msys2_sh(const char *cmd)
{
if (!cmd)
return 0;
if (!strcmp(cmd, "sh")) {
static int ret = -1;
char *p;
if (ret >= 0)
return ret;
p = path_lookup(cmd, 0);
if (!p)
ret = 0;
else {
size_t len = strlen(p);
ret = match_last_path_component(p, &len, "sh.exe") &&
match_last_path_component(p, &len, "bin") &&
match_last_path_component(p, &len, "usr");
free(p);
}
return ret;
}
if (ends_with(cmd, "\\sh.exe")) {
static char *sh;
if (!sh)
sh = path_lookup("sh", 0);
return !fspathcmp(cmd, sh);
}
return 0;
}
static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
const char *dir,
int prepend_cmd, int fhin, int fhout, int fherr)
{
static int restrict_handle_inheritance = -1;
STARTUPINFOEXW si;
PROCESS_INFORMATION pi;
LPPROC_THREAD_ATTRIBUTE_LIST attr_list = NULL;
HANDLE stdhandles[3];
DWORD stdhandles_count = 0;
SIZE_T size;
struct strbuf args;
wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
unsigned flags = CREATE_UNICODE_ENVIRONMENT;
BOOL ret;
HANDLE cons;
const char *(*quote_arg)(const char *arg) =
is_msys2_sh(cmd ? cmd : *argv) ?
quote_arg_msys2 : quote_arg_msvc;
const char *strace_env;
/* Make sure to override previous errors, if any */
errno = 0;
if (restrict_handle_inheritance < 0)
restrict_handle_inheritance = core_restrict_inherited_handles;
/*
* The following code to restrict which handles are inherited seems
* to work properly only on Windows 7 and later, so let's disable it
* on Windows Vista and 2008.
*/
if (restrict_handle_inheritance < 0)
restrict_handle_inheritance = GetVersion() >> 16 >= 7601;
do_unset_environment_variables();
/* Determine whether or not we are associated to a console */
cons = CreateFileW(L"CONOUT$", GENERIC_WRITE,
FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, NULL);
if (cons == INVALID_HANDLE_VALUE) {
/* There is no console associated with this process.
* Since the child is a console process, Windows
* would normally create a console window. But
* since we'll be redirecting std streams, we do
* not need the console.
* It is necessary to use DETACHED_PROCESS
* instead of CREATE_NO_WINDOW to make ssh
* recognize that it has no console.
*/
flags |= DETACHED_PROCESS;
} else {
/* There is already a console. If we specified
* DETACHED_PROCESS here, too, Windows would
* disassociate the child from the console.
* The same is true for CREATE_NO_WINDOW.
* Go figure!
*/
CloseHandle(cons);
}
memset(&si, 0, sizeof(si));
si.StartupInfo.cb = sizeof(si);
si.StartupInfo.hStdInput = winansi_get_osfhandle(fhin);
si.StartupInfo.hStdOutput = winansi_get_osfhandle(fhout);
si.StartupInfo.hStdError = winansi_get_osfhandle(fherr);
/* The list of handles cannot contain duplicates */
if (si.StartupInfo.hStdInput != INVALID_HANDLE_VALUE)
stdhandles[stdhandles_count++] = si.StartupInfo.hStdInput;
if (si.StartupInfo.hStdOutput != INVALID_HANDLE_VALUE &&
si.StartupInfo.hStdOutput != si.StartupInfo.hStdInput)
stdhandles[stdhandles_count++] = si.StartupInfo.hStdOutput;
if (si.StartupInfo.hStdError != INVALID_HANDLE_VALUE &&
si.StartupInfo.hStdError != si.StartupInfo.hStdInput &&
si.StartupInfo.hStdError != si.StartupInfo.hStdOutput)
stdhandles[stdhandles_count++] = si.StartupInfo.hStdError;
if (stdhandles_count)
si.StartupInfo.dwFlags |= STARTF_USESTDHANDLES;
if (*argv && !strcmp(cmd, *argv))
wcmd[0] = L'\0';
else if (xutftowcs_path(wcmd, cmd) < 0)
return -1;
if (dir && xutftowcs_path(wdir, dir) < 0)
return -1;
/* concatenate argv, quoting args as we go */
strbuf_init(&args, 0);
if (prepend_cmd) {
char *quoted = (char *)quote_arg(cmd);
strbuf_addstr(&args, quoted);
if (quoted != cmd)
free(quoted);
}
for (; *argv; argv++) {
char *quoted = (char *)quote_arg(*argv);
if (*args.buf)
strbuf_addch(&args, ' ');
strbuf_addstr(&args, quoted);
if (quoted != *argv)
free(quoted);
}
strace_env = getenv("GIT_STRACE_COMMANDS");
if (strace_env) {
char *p = path_lookup("strace.exe", 1);
if (!p)
return error("strace not found!");
if (xutftowcs_path(wcmd, p) < 0) {
free(p);
return -1;
}
free(p);
if (!strcmp("1", strace_env) ||
!strcasecmp("yes", strace_env) ||
!strcasecmp("true", strace_env))
strbuf_insert(&args, 0, "strace ", 7);
else {
const char *quoted = quote_arg(strace_env);
struct strbuf buf = STRBUF_INIT;
strbuf_addf(&buf, "strace -o %s ", quoted);
if (quoted != strace_env)
free((char *)quoted);
strbuf_insert(&args, 0, buf.buf, buf.len);
strbuf_release(&buf);
}
}
ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
xutftowcs(wargs, args.buf, 2 * args.len + 1);
strbuf_release(&args);
wenvblk = make_environment_block(deltaenv);
memset(&pi, 0, sizeof(pi));
if (restrict_handle_inheritance && stdhandles_count &&
(InitializeProcThreadAttributeList(NULL, 1, 0, &size) ||
GetLastError() == ERROR_INSUFFICIENT_BUFFER) &&
(attr_list = (LPPROC_THREAD_ATTRIBUTE_LIST)
(HeapAlloc(GetProcessHeap(), 0, size))) &&
InitializeProcThreadAttributeList(attr_list, 1, 0, &size) &&
UpdateProcThreadAttribute(attr_list, 0,
PROC_THREAD_ATTRIBUTE_HANDLE_LIST,
stdhandles,
stdhandles_count * sizeof(HANDLE),
NULL, NULL)) {
si.lpAttributeList = attr_list;
flags |= EXTENDED_STARTUPINFO_PRESENT;
}
ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL,
stdhandles_count ? TRUE : FALSE,
flags, wenvblk, dir ? wdir : NULL,
&si.StartupInfo, &pi);
/*
* On Windows 2008 R2, it seems that specifying certain types of handles
* (such as FILE_TYPE_CHAR or FILE_TYPE_PIPE) will always produce an
* error. Rather than playing finicky and fragile games, let's just try
* to detect this situation and simply try again without restricting any
* handle inheritance. This is still better than failing to create
* processes.
*/
if (!ret && restrict_handle_inheritance && stdhandles_count) {
DWORD err = GetLastError();
struct strbuf buf = STRBUF_INIT;
if (err != ERROR_NO_SYSTEM_RESOURCES &&
/*
* On Windows 7 and earlier, handles on pipes and character
* devices are inherited automatically, and cannot be
* specified in the thread handle list. Rather than trying
* to catch each and every corner case (and running the
* chance of *still* forgetting a few), let's just fall
* back to creating the process without trying to limit the
* handle inheritance.
*/
!(err == ERROR_INVALID_PARAMETER &&
GetVersion() >> 16 < 9200) &&
!getenv("SUPPRESS_HANDLE_INHERITANCE_WARNING")) {
DWORD fl = 0;
int i;
setenv("SUPPRESS_HANDLE_INHERITANCE_WARNING", "1", 1);
for (i = 0; i < stdhandles_count; i++) {
HANDLE h = stdhandles[i];
strbuf_addf(&buf, "handle #%d: %p (type %lx, "
"handle info (%d) %lx\n", i, h,
GetFileType(h),
GetHandleInformation(h, &fl),
fl);
}
strbuf_addstr(&buf, "\nThis is a bug; please report it "
"at\nhttps://github.com/git-for-windows/"
"git/issues/new\n\n"
"To suppress this warning, please set "
"the environment variable\n\n"
"\tSUPPRESS_HANDLE_INHERITANCE_WARNING=1"
"\n");
}
restrict_handle_inheritance = 0;
flags &= ~EXTENDED_STARTUPINFO_PRESENT;
ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL,
TRUE, flags, wenvblk, dir ? wdir : NULL,
&si.StartupInfo, &pi);
if (!ret)
errno = err_win_to_posix(GetLastError());
if (ret && buf.len) {
warning("failed to restrict file handles (%ld)\n\n%s",
err, buf.buf);
}
strbuf_release(&buf);
} else if (!ret)
errno = err_win_to_posix(GetLastError());
if (si.lpAttributeList)
DeleteProcThreadAttributeList(si.lpAttributeList);
if (attr_list)
HeapFree(GetProcessHeap(), 0, attr_list);
free(wenvblk);
free(wargs);
if (!ret)
return -1;
CloseHandle(pi.hThread);
/*
* The process ID is the human-readable identifier of the process
* that we want to present in log and error messages. The handle
* is not useful for this purpose. But we cannot close it, either,
* because it is not possible to turn a process ID into a process
* handle after the process terminated.
* Keep the handle in a list for waitpid.
*/
EnterCriticalSection(&pinfo_cs);
{
struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
info->pid = pi.dwProcessId;
info->proc = pi.hProcess;
info->next = pinfo;
pinfo = info;
}
LeaveCriticalSection(&pinfo_cs);
return (pid_t)pi.dwProcessId;
}
static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
{
return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
}
pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
const char *dir,
int fhin, int fhout, int fherr)
{
pid_t pid;
char *prog = path_lookup(cmd, 0);
if (!prog) {
errno = ENOENT;
pid = -1;
}
else {
const char *interpr = parse_interpreter(prog);
if (interpr) {
const char *argv0 = argv[0];
char *iprog = path_lookup(interpr, 1);
argv[0] = prog;
if (!iprog) {
errno = ENOENT;
pid = -1;
}
else {
pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
fhin, fhout, fherr);
free(iprog);
}
argv[0] = argv0;
}
else
pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
fhin, fhout, fherr);
free(prog);
}
return pid;
}
static int try_shell_exec(const char *cmd, char *const *argv)
{
const char *interpr = parse_interpreter(cmd);
char *prog;
int pid = 0;
if (!interpr)
return 0;
prog = path_lookup(interpr, 1);
if (prog) {
int exec_id;
int argc = 0;
#ifndef _MSC_VER
const
#endif
char **argv2;
while (argv[argc]) argc++;
ALLOC_ARRAY(argv2, argc + 1);
argv2[0] = (char *)cmd; /* full path to the script file */
COPY_ARRAY(&argv2[1], &argv[1], argc);
exec_id = trace2_exec(prog, argv2);
pid = mingw_spawnv(prog, argv2, 1);
if (pid >= 0) {
int status;
if (waitpid(pid, &status, 0) < 0)
status = 255;
trace2_exec_result(exec_id, status);
exit(status);
}
trace2_exec_result(exec_id, -1);
pid = 1; /* indicate that we tried but failed */
free(prog);
free(argv2);
}
return pid;
}
int mingw_execv(const char *cmd, char *const *argv)
{
/* check if git_command is a shell script */
if (!try_shell_exec(cmd, argv)) {
int pid, status;
int exec_id;
exec_id = trace2_exec(cmd, (const char **)argv);
pid = mingw_spawnv(cmd, (const char **)argv, 0);
if (pid < 0) {
trace2_exec_result(exec_id, -1);
return -1;
}
if (waitpid(pid, &status, 0) < 0)
status = 255;
trace2_exec_result(exec_id, status);
exit(status);
}
return -1;
}
int mingw_execvp(const char *cmd, char *const *argv)
{
char *prog = path_lookup(cmd, 0);
if (prog) {
mingw_execv(prog, argv);
free(prog);
} else
errno = ENOENT;
return -1;
}
int mingw_kill(pid_t pid, int sig)
{
if (pid > 0 && sig == SIGTERM) {
HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
if (TerminateProcess(h, -1)) {
CloseHandle(h);
return 0;
}
errno = err_win_to_posix(GetLastError());
CloseHandle(h);
return -1;
} else if (pid > 0 && sig == 0) {
HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
if (h) {
CloseHandle(h);
return 0;
}
}
errno = EINVAL;
return -1;
}
/*
* UTF-8 versions of getenv(), putenv() and unsetenv().
* Internally, they use the CRT's stock UNICODE routines
* to avoid data loss.
*/
char *mingw_getenv(const char *name)
{
#define GETENV_MAX_RETAIN 64
static char *values[GETENV_MAX_RETAIN];
static int value_counter;
int len_key, len_value;
wchar_t *w_key;
char *value;
wchar_t w_value[32768];
if (!name || !*name)
return NULL;
len_key = strlen(name) + 1;
/* We cannot use xcalloc() here because that uses getenv() itself */
w_key = calloc(len_key, sizeof(wchar_t));
if (!w_key)
die("Out of memory, (tried to allocate %u wchar_t's)", len_key);
xutftowcs(w_key, name, len_key);
/* GetEnvironmentVariableW() only sets the last error upon failure */
SetLastError(ERROR_SUCCESS);
len_value = GetEnvironmentVariableW(w_key, w_value, ARRAY_SIZE(w_value));
if (!len_value && GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
free(w_key);
return NULL;
}
free(w_key);
len_value = len_value * 3 + 1;
/* We cannot use xcalloc() here because that uses getenv() itself */
value = calloc(len_value, sizeof(char));
if (!value)
die("Out of memory, (tried to allocate %u bytes)", len_value);
xwcstoutf(value, w_value, len_value);
/*
* We return `value` which is an allocated value and the caller is NOT
* expecting to have to free it, so we keep a round-robin array,
* invalidating the buffer after GETENV_MAX_RETAIN getenv() calls.
*/
free(values[value_counter]);
values[value_counter++] = value;
if (value_counter >= ARRAY_SIZE(values))
value_counter = 0;
return value;
}
int mingw_putenv(const char *namevalue)
{
int size;
wchar_t *wide, *equal;
BOOL result;
if (!namevalue || !*namevalue)
return 0;
size = strlen(namevalue) * 2 + 1;
wide = calloc(size, sizeof(wchar_t));
if (!wide)
die("Out of memory, (tried to allocate %u wchar_t's)", size);
xutftowcs(wide, namevalue, size);
equal = wcschr(wide, L'=');
if (!equal)
result = SetEnvironmentVariableW(wide, NULL);
else {
*equal = L'\0';
result = SetEnvironmentVariableW(wide, equal + 1);
}
free(wide);
if (!result)
errno = err_win_to_posix(GetLastError());
return result ? 0 : -1;
}
static void ensure_socket_initialization(void)
{
WSADATA wsa;
static int initialized = 0;
if (initialized)
return;
if (WSAStartup(MAKEWORD(2,2), &wsa))
die("unable to initialize winsock subsystem, error %d",
WSAGetLastError());
atexit((void(*)(void)) WSACleanup);
initialized = 1;
}
#undef gethostname
int mingw_gethostname(char *name, int namelen)
{
ensure_socket_initialization();
return gethostname(name, namelen);
}
#undef gethostbyname
struct hostent *mingw_gethostbyname(const char *host)
{
ensure_socket_initialization();
return gethostbyname(host);
}
#undef getaddrinfo
int mingw_getaddrinfo(const char *node, const char *service,
const struct addrinfo *hints, struct addrinfo **res)
{
ensure_socket_initialization();
return getaddrinfo(node, service, hints, res);
}
int mingw_socket(int domain, int type, int protocol)
{
int sockfd;
SOCKET s;
ensure_socket_initialization();
s = WSASocket(domain, type, protocol, NULL, 0, 0);
if (s == INVALID_SOCKET) {
/*
* WSAGetLastError() values are regular BSD error codes
* biased by WSABASEERR.
* However, strerror() does not know about networking
* specific errors, which are values beginning at 38 or so.
* Therefore, we choose to leave the biased error code
* in errno so that _if_ someone looks up the code somewhere,
* then it is at least the number that are usually listed.
*/
errno = WSAGetLastError();
return -1;
}
/* convert into a file descriptor */
if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
closesocket(s);
return error("unable to make a socket file descriptor: %s",
strerror(errno));
}
return sockfd;
}
#undef connect
int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
{
SOCKET s = (SOCKET)_get_osfhandle(sockfd);
return connect(s, sa, sz);
}
#undef bind
int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
{
SOCKET s = (SOCKET)_get_osfhandle(sockfd);
return bind(s, sa, sz);
}
#undef setsockopt
int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
{
SOCKET s = (SOCKET)_get_osfhandle(sockfd);
return setsockopt(s, lvl, optname, (const char*)optval, optlen);
}
#undef shutdown
int mingw_shutdown(int sockfd, int how)
{
SOCKET s = (SOCKET)_get_osfhandle(sockfd);
return shutdown(s, how);
}
#undef listen
int mingw_listen(int sockfd, int backlog)
{
SOCKET s = (SOCKET)_get_osfhandle(sockfd);
return listen(s, backlog);
}
#undef accept
int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
{
int sockfd2;
SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
SOCKET s2 = accept(s1, sa, sz);
/* convert into a file descriptor */
if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
int err = errno;
closesocket(s2);
return error("unable to make a socket file descriptor: %s",
strerror(err));
}
return sockfd2;
}
#undef rename
int mingw_rename(const char *pold, const char *pnew)
{
DWORD attrs, gle;
int tries = 0;
wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
return -1;
/*
* Try native rename() first to get errno right.
* It is based on MoveFile(), which cannot overwrite existing files.
*/
if (!_wrename(wpold, wpnew))
return 0;
if (errno != EEXIST)
return -1;
repeat:
if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
return 0;
/* TODO: translate more errors */
gle = GetLastError();
if (gle == ERROR_ACCESS_DENIED &&
(attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
DWORD attrsold = GetFileAttributesW(wpold);
if (attrsold == INVALID_FILE_ATTRIBUTES ||
!(attrsold & FILE_ATTRIBUTE_DIRECTORY))
errno = EISDIR;
else if (!_wrmdir(wpnew))
goto repeat;
return -1;
}
if ((attrs & FILE_ATTRIBUTE_READONLY) &&
SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
return 0;
gle = GetLastError();
/* revert file attributes on failure */
SetFileAttributesW(wpnew, attrs);
}
}
if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
/*
* We assume that some other process had the source or
* destination file open at the wrong moment and retry.
* In order to give the other process a higher chance to
* complete its operation, we give up our time slice now.
* If we have to retry again, we do sleep a bit.
*/
Sleep(delay[tries]);
tries++;
goto repeat;
}
if (gle == ERROR_ACCESS_DENIED &&
ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
"Should I try again?", pold, pnew))
goto repeat;
errno = EACCES;
return -1;
}
/*
* Note that this doesn't return the actual pagesize, but
* the allocation granularity. If future Windows specific git code
* needs the real getpagesize function, we need to find another solution.
*/
int mingw_getpagesize(void)
{
SYSTEM_INFO si;
GetSystemInfo(&si);
return si.dwAllocationGranularity;
}
/* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
enum EXTENDED_NAME_FORMAT {
NameDisplay = 3,
NameUserPrincipal = 8
};
static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
{
DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
static wchar_t wbuffer[1024];
DWORD len;
if (!INIT_PROC_ADDR(GetUserNameExW))
return NULL;
len = ARRAY_SIZE(wbuffer);
if (GetUserNameExW(type, wbuffer, &len)) {
char *converted = xmalloc((len *= 3));
if (xwcstoutf(converted, wbuffer, len) >= 0)
return converted;
free(converted);
}
return NULL;
}
char *mingw_query_user_email(void)
{
return get_extended_user_info(NameUserPrincipal);
}
struct passwd *getpwuid(int uid)
{
static unsigned initialized;
static char user_name[100];
static struct passwd *p;
wchar_t buf[100];
DWORD len;
if (initialized)
return p;
len = ARRAY_SIZE(buf);
if (!GetUserNameW(buf, &len)) {
initialized = 1;
return NULL;
}
if (xwcstoutf(user_name, buf, sizeof(user_name)) < 0) {
initialized = 1;
return NULL;
}
p = xmalloc(sizeof(*p));
p->pw_name = user_name;
p->pw_gecos = get_extended_user_info(NameDisplay);
if (!p->pw_gecos)
p->pw_gecos = "unknown";
p->pw_dir = NULL;
initialized = 1;
return p;
}
static HANDLE timer_event;
static HANDLE timer_thread;
static int timer_interval;
static int one_shot;
static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
/* The timer works like this:
* The thread, ticktack(), is a trivial routine that most of the time
* only waits to receive the signal to terminate. The main thread tells
* the thread to terminate by setting the timer_event to the signalled
* state.
* But ticktack() interrupts the wait state after the timer's interval
* length to call the signal handler.
*/
static unsigned __stdcall ticktack(void *dummy)
{
while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
mingw_raise(SIGALRM);
if (one_shot)
break;
}
return 0;
}
static int start_timer_thread(void)
{
timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
if (timer_event) {
timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
if (!timer_thread )
return errno = ENOMEM,
error("cannot start timer thread");
} else
return errno = ENOMEM,
error("cannot allocate resources for timer");
return 0;
}
static void stop_timer_thread(void)
{
if (timer_event)
SetEvent(timer_event); /* tell thread to terminate */
if (timer_thread) {
int rc = WaitForSingleObject(timer_thread, 10000);
if (rc == WAIT_TIMEOUT)
error("timer thread did not terminate timely");
else if (rc != WAIT_OBJECT_0)
error("waiting for timer thread failed: %lu",
GetLastError());
CloseHandle(timer_thread);
}
if (timer_event)
CloseHandle(timer_event);
timer_event = NULL;
timer_thread = NULL;
}
static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
{
return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
}
int setitimer(int type, struct itimerval *in, struct itimerval *out)
{
static const struct timeval zero;
static int atexit_done;
if (out != NULL)
return errno = EINVAL,
error("setitimer param 3 != NULL not implemented");
if (!is_timeval_eq(&in->it_interval, &zero) &&
!is_timeval_eq(&in->it_interval, &in->it_value))
return errno = EINVAL,
error("setitimer: it_interval must be zero or eq it_value");
if (timer_thread)
stop_timer_thread();
if (is_timeval_eq(&in->it_value, &zero) &&
is_timeval_eq(&in->it_interval, &zero))
return 0;
timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
one_shot = is_timeval_eq(&in->it_interval, &zero);
if (!atexit_done) {
atexit(stop_timer_thread);
atexit_done = 1;
}
return start_timer_thread();
}
int sigaction(int sig, struct sigaction *in, struct sigaction *out)
{
if (sig != SIGALRM)
return errno = EINVAL,
error("sigaction only implemented for SIGALRM");
if (out != NULL)
return errno = EINVAL,
error("sigaction: param 3 != NULL not implemented");
timer_fn = in->sa_handler;
return 0;
}
#undef signal
sig_handler_t mingw_signal(int sig, sig_handler_t handler)
{
sig_handler_t old;
switch (sig) {
case SIGALRM:
old = timer_fn;
timer_fn = handler;
break;
case SIGINT:
old = sigint_fn;
sigint_fn = handler;
break;
default:
return signal(sig, handler);
}
return old;
}
#undef raise
int mingw_raise(int sig)
{
switch (sig) {
case SIGALRM:
if (timer_fn == SIG_DFL) {
if (isatty(STDERR_FILENO))
fputs("Alarm clock\n", stderr);
exit(128 + SIGALRM);
} else if (timer_fn != SIG_IGN)
timer_fn(SIGALRM);
return 0;
case SIGINT:
if (sigint_fn == SIG_DFL)
exit(128 + SIGINT);
else if (sigint_fn != SIG_IGN)
sigint_fn(SIGINT);
return 0;
#if defined(_MSC_VER)
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGTERM:
case SIGBREAK:
case SIGABRT:
case SIGABRT_COMPAT:
/*
* The <signal.h> header in the MS C Runtime defines 8 signals
* as being supported on the platform. Anything else causes an
* "Invalid signal or error" (which in DEBUG builds causes the
* Abort/Retry/Ignore dialog). We by-pass the CRT for things we
* already know will fail.
*/
return raise(sig);
default:
errno = EINVAL;
return -1;
#else
default:
return raise(sig);
#endif
}
}
int link(const char *oldpath, const char *newpath)
{
wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
if (xutftowcs_path(woldpath, oldpath) < 0 ||
xutftowcs_path(wnewpath, newpath) < 0)
return -1;
if (!CreateHardLinkW(wnewpath, woldpath, NULL)) {
errno = err_win_to_posix(GetLastError());
return -1;
}
return 0;
}
pid_t waitpid(pid_t pid, int *status, int options)
{
HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
FALSE, pid);
if (!h) {
errno = ECHILD;
return -1;
}
if (pid > 0 && options & WNOHANG) {
if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
CloseHandle(h);
return 0;
}
options &= ~WNOHANG;
}
if (options == 0) {
struct pinfo_t **ppinfo;
if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
CloseHandle(h);
return 0;
}
if (status)
GetExitCodeProcess(h, (LPDWORD)status);
EnterCriticalSection(&pinfo_cs);
ppinfo = &pinfo;
while (*ppinfo) {
struct pinfo_t *info = *ppinfo;
if (info->pid == pid) {
CloseHandle(info->proc);
*ppinfo = info->next;
free(info);
break;
}
ppinfo = &info->next;
}
LeaveCriticalSection(&pinfo_cs);
CloseHandle(h);
return pid;
}
CloseHandle(h);
errno = EINVAL;
return -1;
}
int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
{
int upos = 0, wpos = 0;
const unsigned char *utf = (const unsigned char*) utfs;
if (!utf || !wcs || wcslen < 1) {
errno = EINVAL;
return -1;
}
/* reserve space for \0 */
wcslen--;
if (utflen < 0)
utflen = INT_MAX;
while (upos < utflen) {
int c = utf[upos++] & 0xff;
if (utflen == INT_MAX && c == 0)
break;
if (wpos >= wcslen) {
wcs[wpos] = 0;
errno = ERANGE;
return -1;
}
if (c < 0x80) {
/* ASCII */
wcs[wpos++] = c;
} else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
(utf[upos] & 0xc0) == 0x80) {
/* 2-byte utf-8 */
c = ((c & 0x1f) << 6);
c |= (utf[upos++] & 0x3f);
wcs[wpos++] = c;
} else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
!(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
(utf[upos] & 0xc0) == 0x80 &&
(utf[upos + 1] & 0xc0) == 0x80) {
/* 3-byte utf-8 */
c = ((c & 0x0f) << 12);
c |= ((utf[upos++] & 0x3f) << 6);
c |= (utf[upos++] & 0x3f);
wcs[wpos++] = c;
} else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
wpos + 1 < wcslen &&
!(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
!(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
(utf[upos] & 0xc0) == 0x80 &&
(utf[upos + 1] & 0xc0) == 0x80 &&
(utf[upos + 2] & 0xc0) == 0x80) {
/* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
c = ((c & 0x07) << 18);
c |= ((utf[upos++] & 0x3f) << 12);
c |= ((utf[upos++] & 0x3f) << 6);
c |= (utf[upos++] & 0x3f);
c -= 0x10000;
wcs[wpos++] = 0xd800 | (c >> 10);
wcs[wpos++] = 0xdc00 | (c & 0x3ff);
} else if (c >= 0xa0) {
/* invalid utf-8 byte, printable unicode char: convert 1:1 */
wcs[wpos++] = c;
} else {
/* invalid utf-8 byte, non-printable unicode: convert to hex */
static const char *hex = "0123456789abcdef";
wcs[wpos++] = hex[c >> 4];
if (wpos < wcslen)
wcs[wpos++] = hex[c & 0x0f];
}
}
wcs[wpos] = 0;
return wpos;
}
int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
{
if (!wcs || !utf || utflen < 1) {
errno = EINVAL;
return -1;
}
utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
if (utflen)
return utflen - 1;
errno = ERANGE;
return -1;
}
static void setup_windows_environment(void)
{
char *tmp = getenv("TMPDIR");
/* on Windows it is TMP and TEMP */
if (!tmp) {
if (!(tmp = getenv("TMP")))
tmp = getenv("TEMP");
if (tmp) {
setenv("TMPDIR", tmp, 1);
tmp = getenv("TMPDIR");
}
}
if (tmp) {
/*
* Convert all dir separators to forward slashes,
* to help shell commands called from the Git
* executable (by not mistaking the dir separators
* for escape characters).
*/
convert_slashes(tmp);
}
/* simulate TERM to enable auto-color (see color.c) */
if (!getenv("TERM"))
setenv("TERM", "cygwin", 1);
/* calculate HOME if not set */
if (!getenv("HOME")) {
/*
* try $HOMEDRIVE$HOMEPATH - the home share may be a network
* location, thus also check if the path exists (i.e. is not
* disconnected)
*/
if ((tmp = getenv("HOMEDRIVE"))) {
struct strbuf buf = STRBUF_INIT;
strbuf_addstr(&buf, tmp);
if ((tmp = getenv("HOMEPATH"))) {
strbuf_addstr(&buf, tmp);
if (is_directory(buf.buf))
setenv("HOME", buf.buf, 1);
else
tmp = NULL; /* use $USERPROFILE */
}
strbuf_release(&buf);
}
/* use $USERPROFILE if the home share is not available */
if (!tmp && (tmp = getenv("USERPROFILE")))
setenv("HOME", tmp, 1);
}
}
int is_valid_win32_path(const char *path, int allow_literal_nul)
{
const char *p = path;
int preceding_space_or_period = 0, i = 0, periods = 0;
if (!protect_ntfs)
return 1;
skip_dos_drive_prefix((char **)&path);
goto segment_start;
for (;;) {
char c = *(path++);
switch (c) {
case '\0':
case '/': case '\\':
/* cannot end in ` ` or `.`, except for `.` and `..` */
if (preceding_space_or_period &&
(i != periods || periods > 2))
return 0;
if (!c)
return 1;
i = periods = preceding_space_or_period = 0;
segment_start:
switch (*path) {
case 'a': case 'A': /* AUX */
if (((c = path[++i]) != 'u' && c != 'U') ||
((c = path[++i]) != 'x' && c != 'X')) {
not_a_reserved_name:
path += i;
continue;
}
break;
case 'c': case 'C':
/* COM1 ... COM9, CON, CONIN$, CONOUT$ */
if ((c = path[++i]) != 'o' && c != 'O')
goto not_a_reserved_name;
c = path[++i];
if (c == 'm' || c == 'M') { /* COM1 ... COM9 */
c = path[++i];
if (c < '1' || c > '9')
goto not_a_reserved_name;
} else if (c == 'n' || c == 'N') { /* CON */
c = path[i + 1];
if ((c == 'i' || c == 'I') &&
((c = path[i + 2]) == 'n' ||
c == 'N') &&
path[i + 3] == '$')
i += 3; /* CONIN$ */
else if ((c == 'o' || c == 'O') &&
((c = path[i + 2]) == 'u' ||
c == 'U') &&
((c = path[i + 3]) == 't' ||
c == 'T') &&
path[i + 4] == '$')
i += 4; /* CONOUT$ */
} else
goto not_a_reserved_name;
break;
case 'l': case 'L': /* LPT<N> */
if (((c = path[++i]) != 'p' && c != 'P') ||
((c = path[++i]) != 't' && c != 'T') ||
!isdigit(path[++i]))
goto not_a_reserved_name;
break;
case 'n': case 'N': /* NUL */
if (((c = path[++i]) != 'u' && c != 'U') ||
((c = path[++i]) != 'l' && c != 'L') ||
(allow_literal_nul &&
!path[i + 1] && p == path))
goto not_a_reserved_name;
break;
case 'p': case 'P': /* PRN */
if (((c = path[++i]) != 'r' && c != 'R') ||
((c = path[++i]) != 'n' && c != 'N'))
goto not_a_reserved_name;
break;
default:
continue;
}
/*
* So far, this looks like a reserved name. Let's see
* whether it actually is one: trailing spaces, a file
* extension, or an NTFS Alternate Data Stream do not
* matter, the name is still reserved if any of those
* follow immediately after the actual name.
*/
i++;
if (path[i] == ' ') {
preceding_space_or_period = 1;
while (path[++i] == ' ')
; /* skip all spaces */
}
c = path[i];
if (c && c != '.' && c != ':' && c != '/' && c != '\\')
goto not_a_reserved_name;
/* contains reserved name */
return 0;
case '.':
periods++;
/* fallthru */
case ' ':
preceding_space_or_period = 1;
i++;
continue;
case ':': /* DOS drive prefix was already skipped */
case '<': case '>': case '"': case '|': case '?': case '*':
/* illegal character */
return 0;
default:
if (c > '\0' && c < '\x20')
/* illegal character */
return 0;
}
preceding_space_or_period = 0;
i++;
}
}
#if !defined(_MSC_VER)
/*
* Disable MSVCRT command line wildcard expansion (__getmainargs called from
* mingw startup code, see init.c in mingw runtime).
*/
int _CRT_glob = 0;
#endif
static NORETURN void die_startup(void)
{
fputs("fatal: not enough memory for initialization", stderr);
exit(128);
}
static void *malloc_startup(size_t size)
{
void *result = malloc(size);
if (!result)
die_startup();
return result;
}
static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
{
len = xwcstoutf(buffer, wcs, len) + 1;
return memcpy(malloc_startup(len), buffer, len);
}
static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
DWORD desired_access, DWORD flags)
{
DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
wchar_t buf[MAX_PATH];
DWORD max = ARRAY_SIZE(buf);
HANDLE handle;
DWORD ret = GetEnvironmentVariableW(key, buf, max);
if (!ret || ret >= max)
return;
/* make sure this does not leak into child processes */
SetEnvironmentVariableW(key, NULL);
if (!wcscmp(buf, L"off")) {
close(fd);
handle = GetStdHandle(std_id);
if (handle != INVALID_HANDLE_VALUE)
CloseHandle(handle);
return;
}
if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
handle = GetStdHandle(STD_OUTPUT_HANDLE);
if (handle == INVALID_HANDLE_VALUE) {
close(fd);
handle = GetStdHandle(std_id);
if (handle != INVALID_HANDLE_VALUE)
CloseHandle(handle);
} else {
int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
SetStdHandle(std_id, handle);
dup2(new_fd, fd);
/* do *not* close the new_fd: that would close stdout */
}
return;
}
handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
flags, NULL);
if (handle != INVALID_HANDLE_VALUE) {
int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
SetStdHandle(std_id, handle);
dup2(new_fd, fd);
close(new_fd);
}
}
static void maybe_redirect_std_handles(void)
{
maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
}
#ifdef _MSC_VER
#ifdef _DEBUG
#include <crtdbg.h>
#endif
#endif
/*
* We implement wmain() and compile with -municode, which would
* normally ignore main(), but we call the latter from the former
* so that we can handle non-ASCII command-line parameters
* appropriately.
*
* To be more compatible with the core git code, we convert
* argv into UTF8 and pass them directly to main().
*/
int wmain(int argc, const wchar_t **wargv)
{
int i, maxlen, exit_status;
char *buffer, **save;
const char **argv;
trace2_initialize_clock();
#ifdef _MSC_VER
#ifdef _DEBUG
_CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG);
#endif
#ifdef USE_MSVC_CRTDBG
_CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
#endif
#endif
maybe_redirect_std_handles();
/* determine size of argv and environ conversion buffer */
maxlen = wcslen(wargv[0]);
for (i = 1; i < argc; i++)
maxlen = max(maxlen, wcslen(wargv[i]));
/* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
maxlen = 3 * maxlen + 1;
buffer = malloc_startup(maxlen);
/*
* Create a UTF-8 version of w_argv. Also create a "save" copy
* to remember all the string pointers because parse_options()
* will remove claimed items from the argv that we pass down.
*/
ALLOC_ARRAY(argv, argc + 1);
ALLOC_ARRAY(save, argc + 1);
for (i = 0; i < argc; i++)
argv[i] = save[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
argv[i] = save[i] = NULL;
free(buffer);
/* fix Windows specific environment settings */
setup_windows_environment();
unset_environment_variables = xstrdup("PERL5LIB");
/* initialize critical section for waitpid pinfo_t list */
InitializeCriticalSection(&pinfo_cs);
/* set up default file mode and file modes for stdin/out/err */
_fmode = _O_BINARY;
_setmode(_fileno(stdin), _O_BINARY);
_setmode(_fileno(stdout), _O_BINARY);
_setmode(_fileno(stderr), _O_BINARY);
/* initialize Unicode console */
winansi_init();
/* invoke the real main() using our utf8 version of argv. */
exit_status = main(argc, argv);
for (i = 0; i < argc; i++)
free(save[i]);
free(save);
free(argv);
return exit_status;
}
int uname(struct utsname *buf)
{
unsigned v = (unsigned)GetVersion();
memset(buf, 0, sizeof(*buf));
xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
xsnprintf(buf->release, sizeof(buf->release),
"%u.%u", v & 0xff, (v >> 8) & 0xff);
/* assuming NT variants only.. */
xsnprintf(buf->version, sizeof(buf->version),
"%u", (v >> 16) & 0x7fff);
return 0;
}
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