liminix-fork/pkgs/min-collect-garbage/min-list-garbage.c

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#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <string.h>
#include <unistd.h>
typedef char hash_t[32];
hash_t *hash_list = NULL;
int hash_list_entries = 0;
int hash_list_size = 0;
int add_list_entry(char *name)
{
name += strlen("/nix/store/");
if(hash_list_entries >= hash_list_size) {
if(hash_list_size == 0) hash_list_size = 4;
hash_list_size = hash_list_size * 2;
hash_list = realloc(hash_list, hash_list_size * sizeof(hash_t));
}
strncpy(hash_list[hash_list_entries++], name, 32);
}
int read_list(char *filename)
{
char s[1024];
FILE *fp;
if(fp = fopen(filename, "r")) {
while(fgets(s, 1024, fp)) {
if(strrchr(s, '\n')) {
add_list_entry(s);
} else {
puts("hash list entry too long");
exit(1);
}
}
}
fclose(fp);
}
int on_list(char *name)
{
int i;
for(i = 0; i < hash_list_entries; i++) {
if(!strncmp(hash_list[i], name, 32)) {
return 1;
}
}
return 0;
}
int main(int argc, char * argv[])
{
struct dirent * de;
DIR * dirp;
char hash[32];
if(argc < 2) {
puts("Usage: min-list-garbage store-paths-file\n\nChecks all store paths against the list of expected paths in store-paths-file,\n and prints any which are present unexpectedly");
exit(1);
}
read_list(argv[1]);
if((dirp = opendir("/nix/store")) == NULL) {
puts("can't open /nix/store");
exit(1);
}
while(de = readdir(dirp)) {
if(strlen(de->d_name) >= 32) {
strncpy(hash, de->d_name, 32);
if(!on_list(hash)) puts(de->d_name);
}
}
closedir(dirp);
}