parse_from_existing() has a special case for null_sha1 treating it
as a start of an orphaned branch. It is how null_sha1 parent is
treated in fast-import. For example parse_reset_branch() clears
sha1 of a branch but leaves it in a lookup table.
Looking at parse_from_existing() call sites, we can seen that it is
only called for sha1's that come from get_sha1() or an existing
object. So fast-import internals don't give it null_sha1 explicitly
and the only way for it to appear is direct '0{40}' in the input.
Don't treat null_sha1 as a magic sha1 in parse_from_existing thus
making 'from 0{40}' an invalid input. (Unless there is a commit
object having null_sha1, of course. And object with null_sha1 would
be a lot of trouble in fast-import regardless of this patch.)
Signed-off-by: Dmitry Ivankov <divanorama@xxxxxxxxx>
---
fast-import.c | 17 ++++++-----------
t/t9300-fast-import.sh | 2 +-
2 files changed, 7 insertions(+), 12 deletions(-)
diff --git a/fast-import.c b/fast-import.c
index 742e7da..827434a 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -2488,18 +2488,13 @@ static void parse_from_commit(struct branch *b, char *buf, unsigned long size)
static void parse_from_existing(struct branch *b)
{
- if (is_null_sha1(b->sha1)) {
- hashclr(b->branch_tree.versions[0].sha1);
- hashclr(b->branch_tree.versions[1].sha1);
- } else {
- unsigned long size;
- char *buf;
+ unsigned long size;
+ char *buf;
- buf = read_object_with_reference(b->sha1,
- commit_type, &size, b->sha1);
- parse_from_commit(b, buf, size);
- free(buf);
- }
+ buf = read_object_with_reference(b->sha1,
+ commit_type, &size, b->sha1);
+ parse_from_commit(b, buf, size);
+ free(buf);
}
static int parse_from(struct branch *b)
diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
index 8cc3f16..0784d50 100755
--- a/t/t9300-fast-import.sh
+++ b/t/t9300-fast-import.sh
@@ -381,7 +381,7 @@ data 0
from 0000000000000000000000000000000000000000
INPUT_END
-test_expect_failure 'B: fail on "from 0{40}"' '
+test_expect_success 'B: fail on "from 0{40}"' '
test_must_fail git fast-import <input
'
rm -f .git/objects/pack_* .git/objects/index_*
--
1.7.3.4
--
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