f4609b896f
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
106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
#include "builtin.h"
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#include "cache.h"
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#include "pack.h"
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#include "parse-options.h"
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static const char *const show_index_usage[] = {
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"git show-index [--object-format=<hash-algorithm>]",
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NULL
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};
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int cmd_show_index(int argc, const char **argv, const char *prefix)
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{
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int i;
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unsigned nr;
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unsigned int version;
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static unsigned int top_index[256];
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unsigned hashsz;
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const char *hash_name = NULL;
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int hash_algo;
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const struct option show_index_options[] = {
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OPT_STRING(0, "object-format", &hash_name, N_("hash-algorithm"),
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N_("specify the hash algorithm to use")),
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OPT_END()
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};
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argc = parse_options(argc, argv, prefix, show_index_options, show_index_usage, 0);
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if (hash_name) {
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hash_algo = hash_algo_by_name(hash_name);
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if (hash_algo == GIT_HASH_UNKNOWN)
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die(_("Unknown hash algorithm"));
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repo_set_hash_algo(the_repository, hash_algo);
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}
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hashsz = the_hash_algo->rawsz;
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if (fread(top_index, 2 * 4, 1, stdin) != 1)
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die("unable to read header");
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if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) {
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version = ntohl(top_index[1]);
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if (version < 2 || version > 2)
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die("unknown index version");
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if (fread(top_index, 256 * 4, 1, stdin) != 1)
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die("unable to read index");
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} else {
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version = 1;
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if (fread(&top_index[2], 254 * 4, 1, stdin) != 1)
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die("unable to read index");
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}
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nr = 0;
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for (i = 0; i < 256; i++) {
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unsigned n = ntohl(top_index[i]);
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if (n < nr)
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die("corrupt index file");
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nr = n;
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}
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if (version == 1) {
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for (i = 0; i < nr; i++) {
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unsigned int offset, entry[(GIT_MAX_RAWSZ + 4) / sizeof(unsigned int)];
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if (fread(entry, 4 + hashsz, 1, stdin) != 1)
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die("unable to read entry %u/%u", i, nr);
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offset = ntohl(entry[0]);
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printf("%u %s\n", offset, hash_to_hex((void *)(entry+1)));
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}
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} else {
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unsigned off64_nr = 0;
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struct {
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struct object_id oid;
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uint32_t crc;
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uint32_t off;
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} *entries;
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ALLOC_ARRAY(entries, nr);
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for (i = 0; i < nr; i++)
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if (fread(entries[i].oid.hash, hashsz, 1, stdin) != 1)
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die("unable to read sha1 %u/%u", i, nr);
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for (i = 0; i < nr; i++)
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if (fread(&entries[i].crc, 4, 1, stdin) != 1)
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die("unable to read crc %u/%u", i, nr);
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for (i = 0; i < nr; i++)
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if (fread(&entries[i].off, 4, 1, stdin) != 1)
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die("unable to read 32b offset %u/%u", i, nr);
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for (i = 0; i < nr; i++) {
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uint64_t offset;
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uint32_t off = ntohl(entries[i].off);
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if (!(off & 0x80000000)) {
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offset = off;
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} else {
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uint32_t off64[2];
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if ((off & 0x7fffffff) != off64_nr)
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die("inconsistent 64b offset index");
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if (fread(off64, 8, 1, stdin) != 1)
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die("unable to read 64b offset %u", off64_nr);
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offset = (((uint64_t)ntohl(off64[0])) << 32) |
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ntohl(off64[1]);
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off64_nr++;
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}
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printf("%" PRIuMAX " %s (%08"PRIx32")\n",
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(uintmax_t) offset,
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oid_to_hex(&entries[i].oid),
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ntohl(entries[i].crc));
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}
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free(entries);
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}
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return 0;
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}
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