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unpack-trees: handle lstat failure for existing directory 

When check_leading_path notices no file in the way of the new entry to
be checked out, verify_absent checks whether there is a directory
there or nothing at all.  If that lstat call fails (for example due to
ENOMEM), it assumes ENOENT, meaning a directory with untracked files
would be clobbered in that case.

Check errno after calling lstat, and for conditions other than ENOENT,
just error out.

This is a theoretical race condition.  lstat has to succeed moments
before it fails for there to be trouble.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Nieder 2011-01-12 20:26:36 -06:00 committed by Junio C Hamano
parent 3f14246899
commit 92fda79ed0
1 changed files with 9 additions and 5 deletions
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14
unpack-trees.c
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@ -1197,12 +1197,16 @@ static int verify_absent_1(struct cache_entry *ce,
return check_ok_to_remove(path, len, DT_UNKNOWN, NULL, &st,
error_type, o);
} else if (!lstat(ce->name, &st))
} else if (lstat(ce->name, &st)) {
if (errno != ENOENT)
return error("cannot stat '%s': %s", ce->name,
strerror(errno));
return 0;
} else {
return check_ok_to_remove(ce->name, ce_namelen(ce),
ce_to_dtype(ce), ce, &st,
error_type, o);
return 0;
ce_to_dtype(ce), ce, &st,
error_type, o);
}
}
static int verify_absent(struct cache_entry *ce,