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Support 'master@2 hours ago' syntax

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Extended sha1 expressions may now include date specifications
which indicate a point in time within the local repository's
history.  If the ref indicated to the left of '@' has a log in
$GIT_DIR/logs/<ref> then the value of the ref at the time indicated
by the specification is obtained from the ref's log.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Shawn Pearce
2006-05-17 05:56:09 -04:00
committed by Junio C Hamano
parent 6de08ae688
commit d556fae2c0
4 changed files with 104 additions and 17 deletions
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53
refs.c
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@ -429,3 +429,56 @@ int write_ref_sha1(struct ref_lock *lock,
unlock_ref(lock);
return 0;
}
int read_ref_at(const char *ref, unsigned long at_time, unsigned char *sha1)
{
const char *logfile, *logdata, *logend, *rec, *c;
char *tz_c;
int logfd, tz;
struct stat st;
unsigned long date;
logfile = git_path("logs/%s", ref);
logfd = open(logfile, O_RDONLY, 0);
if (logfd < 0)
die("Unable to read log %s: %s", logfile, strerror(errno));
fstat(logfd, &st);
if (!st.st_size)
die("Log %s is empty.", logfile);
logdata = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, logfd, 0);
close(logfd);
rec = logend = logdata + st.st_size;
while (logdata < rec) {
if (logdata < rec && *(rec-1) == '\n')
rec--;
while (logdata < rec && *(rec-1) != '\n')
rec--;
c = rec;
while (c < logend && *c != '>' && *c != '\n')
c++;
if (c == logend || *c == '\n')
die("Log %s is corrupt.", logfile);
date = strtoul(c, NULL, 10);
if (date <= at_time) {
if (get_sha1_hex(rec + 41, sha1))
die("Log %s is corrupt.", logfile);
munmap((void*)logdata, st.st_size);
return 0;
}
}
c = logdata;
while (c < logend && *c != '>' && *c != '\n')
c++;
if (c == logend || *c == '\n')
die("Log %s is corrupt.", logfile);
date = strtoul(c, &tz_c, 10);
tz = strtoul(tz_c, NULL, 10);
if (get_sha1_hex(logdata, sha1))
die("Log %s is corrupt.", logfile);
munmap((void*)logdata, st.st_size);
fprintf(stderr, "warning: Log %s only goes back to %s.\n",
logfile, show_rfc2822_date(date, tz));
return 0;
}