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for_each_recent_reflog_ent(): use strbuf, fix offset handling

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As Vladimir reported, "git log -g refs/stash" surprisingly showed the reflog
of HEAD if the message in the reflog file was too long.  To fix this, convert
for_each_recent_reflog_ent() to use strbuf_getwholeline() instead of fgets(),
for safety and to avoid any size limits for reflog entries.

Also reverse the logic of the part of the function that only looks at file
tails.  It used to close the file if fgets() succeeded.  The following
fgets() call in the while loop was likely to fail in this case, too, so
passing an offset to for_each_recent_reflog_ent() never worked.  Change it to
error out if strbuf_getwholeline() fails instead.

Reported-by: Vladimir Panteleev <vladimir@thecybershadow.net>
Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe 2010-03-13 18:37:50 +01:00 committed by Junio C Hamano
parent 34b383e7cd
commit 8ca7880356
1 changed files with 12 additions and 10 deletions
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22
refs.c
View file

@ -1574,7 +1574,7 @@ int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs,
{
const char *logfile;
FILE *logfp;
char buf[1024];
struct strbuf sb = STRBUF_INIT;
int ret = 0;
logfile = git_path("logs/%s", ref);
@ -1587,24 +1587,24 @@ int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs,
if (fstat(fileno(logfp), &statbuf) ||
statbuf.st_size < ofs ||
fseek(logfp, -ofs, SEEK_END) ||
fgets(buf, sizeof(buf), logfp)) {
strbuf_getwholeline(&sb, logfp, '\n')) {
fclose(logfp);
strbuf_release(&sb);
return -1;
}
}
while (fgets(buf, sizeof(buf), logfp)) {
while (!strbuf_getwholeline(&sb, logfp, '\n')) {
unsigned char osha1[20], nsha1[20];
char *email_end, *message;
unsigned long timestamp;
int len, tz;
int tz;
/* old SP new SP name <email> SP time TAB msg LF */
len = strlen(buf);
if (len < 83 || buf[len-1] != '\n' ||
get_sha1_hex(buf, osha1) || buf[40] != ' ' ||
get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' ||
!(email_end = strchr(buf + 82, '>')) ||
if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' ||
get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' ||
get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' ||
!(email_end = strchr(sb.buf + 82, '>')) ||
email_end[1] != ' ' ||
!(timestamp = strtoul(email_end + 2, &message, 10)) ||
!message || message[0] != ' ' ||
@ -1618,11 +1618,13 @@ int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs,
message += 6;
else
message += 7;
ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data);
ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message,
cb_data);
if (ret)
break;
}
fclose(logfp);
strbuf_release(&sb);
return ret;
}