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get_sha1_basic(): corner case ambiguity fix

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When .git/refs/heads/frotz and .git/refs/tags/frotz existed, and
the object name stored in .git/refs/heads/frotz were corrupt, we
ended up picking tags/frotz without complaining.  Worse yet, if
the corrupt .git/refs/heads/frotz was more than 40 bytes and
began with hexadecimal characters, it silently overwritten the
initial part of the returned result.

This commit adds a couple of tests to demonstrate these cases,
with a fix.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2005-12-15 12:54:00 -08:00
parent 8431c4eb09
commit 6677c4665a
3 changed files with 75 additions and 9 deletions
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35
sha1_name.c
View file

@ -203,11 +203,12 @@ const char *find_unique_abbrev(const unsigned char *sha1, int len)
return NULL;
}
static int ambiguous_path(const char *path)
static int ambiguous_path(const char *path, int len)
{
int slash = 1;
int cnt;
for (;;) {
for (cnt = 0; cnt < len; cnt++) {
switch (*path++) {
case '\0':
break;
@ -224,6 +225,7 @@ static int ambiguous_path(const char *path)
}
return slash;
}
return slash;
}
static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
@ -242,26 +244,41 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
return 0;
/* Accept only unambiguous ref paths. */
if (ambiguous_path(str))
if (ambiguous_path(str, len))
return -1;
for (p = prefix; *p; p++) {
char *pathname = git_path("%s/%.*s", *p, len, str);
if (!read_ref(pathname, sha1)) {
/* Must be unique; i.e. when heads/foo and
* tags/foo are both present, reject "foo".
* Note that read_ref() eventually calls
* get_sha1_hex() which can smudge initial
* part of the buffer even if what is read
* is found to be invalid halfway.
*/
if (1 < found++)
return -1;
}
/* We want to allow .git/description file and
* "description" branch to exist at the same time.
* "git-rev-parse description" should silently skip
* .git/description file as a candidate for
* get_sha1(). However, having garbage file anywhere
* under refs/ is not OK, and we would not have caught
* ambiguous heads and tags with the above test.
*/
else if (**p && !access(pathname, F_OK)) {
/* Garbage exists under .git/refs */
return error("garbage ref found '%s'", pathname);
}
}
if (found == 1)
switch (found) {
case 0:
return -1;
case 1:
return 0;
return -1;
default:
return error("ambiguous refname '%.*s'", len, str);
}
}
static int get_sha1_1(const char *name, int len, unsigned char *sha1);

48
t/t0000-basic.sh
View file

@ -205,4 +205,52 @@ test_expect_success \
'no diff after checkout and git-update-index --refresh.' \
'git-diff-files >current && cmp -s current /dev/null'
# extended sha1 parsing and ambiguity resolution
GIT_AUTHOR_DATE='1995-01-29T16:00:00 -0800'
GIT_AUTHOR_EMAIL=a.u.thor@example.com
GIT_AUTHOR_NAME='A U Thor'
GIT_COMMITTER_DATE='1995-01-29T16:00:00 -0800'
GIT_COMMITTER_EMAIL=c.o.mmitter@example.com
GIT_COMMITTER_NAME='C O Mmitter'
export GIT_AUTHOR_DATE
export GIT_AUTHOR_EMAIL
export GIT_AUTHOR_NAME
export GIT_COMMITTER_DATE
export GIT_COMMITTER_EMAIL
export GIT_COMMITTER_NAME
test_expect_success \
'initial commit.' \
'commit=$(echo Initial commit | git-commit-tree $tree) &&
echo "$commit" >.git/refs/heads/master &&
git-ls-tree HEAD &&
test "$commit" = 51a092e9ef6cbbe66d258acd17599d3f80be6162'
test_expect_success \
'Ambiguous' \
'echo "$commit" >.git/refs/heads/nasty &&
echo "$commit" >.git/refs/tags/nasty &&
if git-rev-parse --verify nasty
then
echo "should have barfed"
false
else
:
fi &&
# names directly underneath .git/ should not interfere
echo "$commit" >.git/refs/heads/description &&
git-rev-parse --verify description &&
# broken object name
echo fffffffffffffffffffffffffffffffffffffffg \
>.git/refs/heads/nasty &&
if git-rev-parse --verify nasty
then
echo "should have barfed"
false
else
:
fi'
test_done

1
t/test-lib.sh
View file

@ -18,6 +18,7 @@ unset GIT_ALTERNATE_OBJECT_DIRECTORIES
unset GIT_AUTHOR_DATE
unset GIT_AUTHOR_EMAIL
unset GIT_AUTHOR_NAME
unset GIT_COMMITTER_DATE
unset GIT_COMMITTER_EMAIL
unset GIT_COMMITTER_NAME
unset GIT_DIFF_OPTS