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tar: Apply mtime at the end otherwise it gets reverted

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Consider the following scenario:

1) create a/
2) apply mtime to a/
3) create a/b # reverts mtime on a

TODO: utimes() does not work on symlinks.
This commit is contained in:
sin 2015-04-23 12:34:37 +01:00
parent aab2e273bd
commit ce4a10abe7
1 changed files with 40 additions and 8 deletions
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48
tar.c
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@ -55,6 +55,31 @@ static dev_t tardev;
static int mflag;
static char filtermode = '\0';
struct ent {
char *name;
time_t mtime;
} *ents;
static size_t entlen;
static void
pushent(char *name, time_t mtime)
{
ents = reallocarray(ents, entlen + 1, sizeof(*ents));
ents[entlen].name = strdup(name);
ents[entlen].mtime = mtime;
entlen++;
}
struct ent *
popent(void)
{
if (entlen) {
entlen--;
return &ents[entlen];
}
return NULL;
}
static FILE *
decomp(FILE *fp)
{
@ -170,7 +195,6 @@ static int
unarchive(char *fname, ssize_t l, char b[BLKSIZ])
{
FILE *f = NULL;
struct timeval times[2];
struct header *h = (struct header *)b;
long mode, major, minor, type, mtime, uid, gid;
char lname[101], *tmp, *p;
@ -247,13 +271,7 @@ unarchive(char *fname, ssize_t l, char b[BLKSIZ])
if (f)
fshut(f, fname);
if (!mflag) {
times[0].tv_sec = times[1].tv_sec = mtime;
times[0].tv_usec = times[1].tv_usec = 0;
if (utimes(fname, times) < 0)
eprintf("utimes %s:", fname);
}
pushent(fname, mtime);
return 0;
}
@ -315,7 +333,9 @@ static void
xt(int argc, char *argv[], int (*fn)(char *, ssize_t, char[BLKSIZ]))
{
char b[BLKSIZ], fname[256 + 1], *p;
struct timeval times[2];
struct header *h = (struct header *)b;
struct ent *ent;
long size;
int i, n;
@ -353,6 +373,18 @@ xt(int argc, char *argv[], int (*fn)(char *, ssize_t, char[BLKSIZ]))
}
if (ferror(tarfile))
eprintf("fread %s:", tarfilename);
if (!mflag) {
while ((ent = popent())) {
times[0].tv_sec = times[1].tv_sec = ent->mtime;
times[0].tv_usec = times[1].tv_usec = 0;
if (utimes(ent->name, times) < 0)
weprintf("utimes %s:", ent->name);
free(ent->name);
}
free(ents);
ents = NULL;
}
}
static void