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tree-walk: be more specific about corrupt tree errors

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When the tree-walker runs into an error, it just calls
die(), and the message is always "corrupt tree file".
However, we are actually covering several cases here; let's
give the user a hint about what happened.

Let's also avoid using the word "corrupt", which makes it
seem like the data bit-rotted on disk. Our sha1 check would
already have found that. These errors are ones of data that
is malformed in the first place.

Signed-off-by: David Turner <dturner@twosigma.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2016-09-27 16:59:50 -04:00 committed by Junio C Hamano
parent 6fe1b1407e
commit 2edffef233
2 changed files with 30 additions and 7 deletions
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25
t/t1007-hash-object.sh
View File

@ -183,9 +183,30 @@ for args in "-w --stdin-paths" "--stdin-paths -w"; do
pop_repo
done
test_expect_success 'corrupt tree' '
test_expect_success 'too-short tree' '
echo abc >malformed-tree &&
test_must_fail git hash-object -t tree malformed-tree
test_must_fail git hash-object -t tree malformed-tree 2>err &&
test_i18ngrep "too-short tree object" err
'
hex2oct() {
perl -ne 'printf "\\%03o", hex for /../g'
}
test_expect_success 'malformed mode in tree' '
hex_sha1=$(echo foo | git hash-object --stdin -w) &&
bin_sha1=$(echo $hex_sha1 | hex2oct) &&
printf "9100644 \0$bin_sha1" >tree-with-malformed-mode &&
test_must_fail git hash-object -t tree tree-with-malformed-mode 2>err &&
test_i18ngrep "malformed mode in tree entry" err
'
test_expect_success 'empty filename in tree' '
hex_sha1=$(echo foo | git hash-object --stdin -w) &&
bin_sha1=$(echo $hex_sha1 | hex2oct) &&
printf "100644 \0$bin_sha1" >tree-with-empty-filename &&
test_must_fail git hash-object -t tree tree-with-empty-filename 2>err &&
test_i18ngrep "empty filename in tree entry" err
'
test_expect_success 'corrupt commit' '

12
tree-walk.c
View File

@ -27,12 +27,14 @@ static void decode_tree_entry(struct tree_desc *desc, const char *buf, unsigned
const char *path;
unsigned int mode, len;
if (size < 24 || buf[size - 21])
die("corrupt tree file");
if (size < 23 || buf[size - 21])
die(_("too-short tree object"));
path = get_mode(buf, &mode);
if (!path || !*path)
die("corrupt tree file");
if (!path)
die(_("malformed mode in tree entry for tree"));
if (!*path)
die(_("empty filename in tree entry for tree"));
len = strlen(path) + 1;
/* Initialize the descriptor entry */
@ -81,7 +83,7 @@ void update_tree_entry(struct tree_desc *desc)
unsigned long len = end - (const unsigned char *)buf;
if (size < len)
die("corrupt tree file");
die(_("too-short tree file"));
buf = end;
size -= len;
desc->buffer = buf;