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name-hash: allow hashing an empty string

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Usually we do not pass an empty string to the function hash_name()
because we almost always ask for hash values for a path that is a
candidate to be added to the index. However, check-ignore (and most
likely check-attr, but I didn't check) apparently has a callchain
to ask the hash value for an empty path when it was given a "." from
the top-level directory to ask "Is the path . excluded by default?"

Make sure that hash_name() does not overrun the end of the given
pathname even when it is empty.

Remove a sweep-the-issue-under-the-rug conditional in check-ignore
that avoided to pass an empty string to the callchain while at it.
It is a valid question to ask for check-ignore if the top-level is
set to be ignored by default, even though the answer is most likely
no, if only because there is currently no way to specify such an
entry in the .gitignore file. But it is an unusual thing to ask and
it is not worth optimizing for it by special casing at the top level
of the call chain.

Signed-off-by: Adam Spiers <git@adamspiers.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2013-02-19 11:56:44 -08:00
parent 6866654627
commit c19387e799
3 changed files with 8 additions and 3 deletions
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2
builtin/check-ignore.c
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@ -89,7 +89,7 @@ static int check_ignore(const char *prefix, const char **pathspec)
? strlen(prefix) : 0, path);
full_path = check_path_for_gitlink(full_path);
die_if_path_beyond_symlink(full_path, prefix);
if (!seen[i] && path[0]) {
if (!seen[i]) {
exclude = last_exclude_matching_path(&check, full_path,
-1, &dtype);
if (exclude) {

4
name-hash.c
View File

@ -24,11 +24,11 @@ static unsigned int hash_name(const char *name, int namelen)
{
unsigned int hash = 0x123;
do {
while (namelen--) {
unsigned char c = *name++;
c = icase_hash(c);
hash = hash*101 + c;
} while (--namelen);
}
return hash;
}

5
t/t0008-ignores.sh
View File

@ -138,6 +138,7 @@ test_expect_success 'setup' '
cat <<-\EOF >.gitignore &&
one
ignored-*
top-level-dir/
EOF
for dir in . a
do
@ -177,6 +178,10 @@ test_expect_success 'setup' '
#
# test invalid inputs
test_expect_success_multi '. corner-case' '' '
test_check_ignore . 1
'
test_expect_success_multi 'empty command line' '' '
test_check_ignore "" 128 &&
stderr_contains "fatal: no path specified"