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show-diff.c
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81 lines (73 loc) · 1.99 KB
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#include "cache.h"
#define MTIME_CHANGED 0x0001
#define CTIME_CHANGED 0x0002
#define OWNER_CHANGED 0x0004
#define MODE_CHANGED 0x0008
#define INODE_CHANGED 0x0010
#define DATA_CHANGED 0x0020
static int match_stat(struct cache_entry *ce, struct stat *st)
{
unsigned int changed = 0;
if (ce->mtime.sec != (unsigned int)st->st_mtim.tv_sec ||
ce->mtime.nsec != (unsigned int)st->st_mtim.tv_nsec)
changed |= MTIME_CHANGED;
if (ce->ctime.sec != (unsigned int)st->st_ctim.tv_sec ||
ce->ctime.nsec != (unsigned int)st->st_ctim.tv_nsec)
changed |= CTIME_CHANGED;
if (ce->st_uid != (unsigned int)st->st_uid ||
ce->st_gid != (unsigned int)st->st_gid)
changed |= OWNER_CHANGED;
if (ce->st_mode != (unsigned int)st->st_mode)
changed |= MODE_CHANGED;
if (ce->st_dev != (unsigned int)st->st_dev ||
ce->st_ino != (unsigned int)st->st_ino)
changed |= INODE_CHANGED;
if (ce->st_size != (unsigned int)st->st_size)
changed |= DATA_CHANGED;
return changed;
}
static void show_differences(struct cache_entry *ce, struct stat *cur,
void *old_contents, unsigned long long old_size)
{
static char cmd[1000];
FILE *f;
snprintf(cmd, sizeof(cmd), "diff -u - %s", ce->name);
f = popen(cmd, "w");
fwrite(old_contents, old_size, 1, f);
pclose(f);
}
int main(int argc, char **argv)
{
int entries = read_cache();
int i;
if (entries < 0) {
perror("read_cache");
exit(1);
}
for (i = 0; i < entries; i++) {
struct stat st;
struct cache_entry *ce = active_cache[i];
int n, changed;
unsigned int mode;
unsigned long size;
char type[20];
void *new;
if (stat(ce->name, &st) < 0) {
printf("%s: %s\n", ce->name, strerror(errno));
continue;
}
changed = match_stat(ce, &st);
if (!changed) {
printf("%s: ok\n", ce->name);
continue;
}
printf("%.*s: ", ce->namelen, ce->name);
for (n = 0; n < 20; n++)
printf("%02x", ce->sha1[n]);
printf("\n");
new = read_sha1_file(ce->sha1, type, &size);
show_differences(ce, &st, new, size);
free(new);
}
return 0;
}