# [PATCH 0/2] fast-import: fix segfault and tests

7 messages from 2014-08-28 to 2014-08-29. Participants: Maxim Bublis, Junio C Hamano.
Thread: https://gitlist.dev/t/37437

## Maxim Bublis, 2014-08-28 14:54

Subject: [PATCH 0/2] fast-import: fix segfault and tests
Message-ID: <1409237674-74185-1-git-send-email-satori@yandex-team.ru>
URL: https://gitlist.dev/e/1409237674-74185-1-git-send-email-satori%40yandex-team.ru

```
Removing root tree with filedelete command would lead to segmentation fault
in store_tree(). First patch from patch series adds test to show incorrect
behaviour and second one fixes bug by sanity check and load_tree() usage.

Maxim Bublis (2):
  t9300: test filedelete root
  fast-import: fix segfault in store_tree()

 fast-import.c          |  6 +++++-
 t/t9300-fast-import.sh | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+), 1 deletion(-)

-- 
1.8.5.2 (Apple Git-48)

```

## Maxim Bublis, 2014-08-28 14:54

Subject: [PATCH 1/2] t9300: test filedelete root
Message-ID: <1409237674-74185-2-git-send-email-satori@yandex-team.ru>
URL: https://gitlist.dev/e/1409237674-74185-2-git-send-email-satori%40yandex-team.ru
In-Reply-To: <1409237674-74185-1-git-send-email-satori@yandex-team.ru>

```
Add new fast-import test series for filedelete command.

Signed-off-by: Maxim Bublis <satori@yandex-team.ru>
---
 t/t9300-fast-import.sh | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
index 5fc9ef2..3d557b3 100755
--- a/t/t9300-fast-import.sh
+++ b/t/t9300-fast-import.sh
@@ -3017,4 +3017,50 @@ test_expect_success 'T: empty reset doesnt delete branch' '
 	git rev-parse --verify refs/heads/not-to-delete
 '
 
+###
+### series U (filedelete)
+###
+
+cat >input <<INPUT_END
+commit refs/heads/U
+committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
+data <<COMMIT
+test setup
+COMMIT
+M 100644 inline hello.c
+data <<BLOB
+blob 1
+BLOB
+
+INPUT_END
+
+test_expect_success 'U: initialize for U tests' '
+	git fast-import <input
+'
+
+cat >input <<INPUT_END
+commit refs/heads/U
+committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
+data <<COMMIT
+must succeed
+COMMIT
+from refs/heads/U^0
+D ""
+
+INPUT_END
+
+test_expect_success 'U: filedelete root succeeds' '
+    git fast-import <input
+'
+
+cat >expect <<EOF
+:100644 000000 c18147dc648481eeb65dc5e66628429a64843327 0000000000000000000000000000000000000000 D	hello.c
+EOF
+
+git diff-tree -M -r U^1 U >actual
+
+test_expect_success 'U: validate filedelete result' '
+	compare_diff_raw expect actual
+'
+
 test_done
-- 
1.8.5.2 (Apple Git-48)

```

## Maxim Bublis, 2014-08-28 14:54

Subject: [PATCH 2/2] fast-import: fix segfault in store_tree()
Message-ID: <1409237674-74185-3-git-send-email-satori@yandex-team.ru>
URL: https://gitlist.dev/e/1409237674-74185-3-git-send-email-satori%40yandex-team.ru
In-Reply-To: <1409237674-74185-1-git-send-email-satori@yandex-team.ru>

```
Branch tree is NULLified by filedelete command if we are trying
to delete root tree. Add sanity check and use load_tree() in that case.

Signed-off-by: Maxim Bublis <satori@yandex-team.ru>
---
 fast-import.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fast-import.c b/fast-import.c
index d73f58c..b77f12c 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -1419,7 +1419,7 @@ static void mktree(struct tree_content *t, int v, struct strbuf *b)
 
 static void store_tree(struct tree_entry *root)
 {
-	struct tree_content *t = root->tree;
+	struct tree_content *t;
 	unsigned int i, j, del;
 	struct last_object lo = { STRBUF_INIT, 0, 0, /* no_swap */ 1 };
 	struct object_entry *le = NULL;
@@ -1427,6 +1427,10 @@ static void store_tree(struct tree_entry *root)
 	if (!is_null_sha1(root->versions[1].sha1))
 		return;
 
+	if (!root->tree)
+		load_tree(root)
+	t = root->tree;
+
 	for (i = 0; i < t->entry_count; i++) {
 		if (t->entries[i]->tree)
 			store_tree(t->entries[i]);
-- 
1.8.5.2 (Apple Git-48)

```

## Junio C Hamano, 2014-08-28 22:30

Subject: Re: [PATCH 1/2] t9300: test filedelete root
Message-ID: <xmqqa96o8cxa.fsf@gitster.dls.corp.google.com>
URL: https://gitlist.dev/e/xmqqa96o8cxa.fsf%40gitster.dls.corp.google.com
In-Reply-To: <1409237674-74185-2-git-send-email-satori@yandex-team.ru>

```
Maxim Bublis <satori@yandex-team.ru> writes:

> Add new fast-import test series for filedelete command.
>
> Signed-off-by: Maxim Bublis <satori@yandex-team.ru>
> ---

You may have been concentrating on the "delete root" case, but as
long as you claim "We add a series to test filedelete command", it
would be sensible to test more typical cases of deleting files, not
the entire tree as well, no?  Perhaps add three paths in the initial
commit e.g. hello.c, good/night.txt and good/bye.txt, first remove
good/night.txt and validate the result, then remove good/ directory
and validate the result, and finally remove the whole thing and
validate the result, or something like that?

In a patch series that introduces a demonstration of existing
breakage and then fixes the breakage in a separate patch, mark the
test that shows the known breakage with test_expect_failure and then
turn that line into test_expect_success in the later patch that
fixes the breakage.

What the test checks and the fix in 2/2 both looked sensible from a
cursory read.

Thanks.

>  t/t9300-fast-import.sh | 46 ++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
>
> diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
> index 5fc9ef2..3d557b3 100755
> --- a/t/t9300-fast-import.sh
> +++ b/t/t9300-fast-import.sh
> @@ -3017,4 +3017,50 @@ test_expect_success 'T: empty reset doesnt delete branch' '
>  	git rev-parse --verify refs/heads/not-to-delete
>  '
>  
> +###
> +### series U (filedelete)
> +###
> +
> +cat >input <<INPUT_END
> +commit refs/heads/U
> +committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
> +data <<COMMIT
> +test setup
> +COMMIT
> +M 100644 inline hello.c
> +data <<BLOB
> +blob 1
> +BLOB
> +
> +INPUT_END
> +
> +test_expect_success 'U: initialize for U tests' '
> +	git fast-import <input
> +'
> +
> +cat >input <<INPUT_END
> +commit refs/heads/U
> +committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
> +data <<COMMIT
> +must succeed
> +COMMIT
> +from refs/heads/U^0
> +D ""
> +
> +INPUT_END
> +
> +test_expect_success 'U: filedelete root succeeds' '
> +    git fast-import <input
> +'
> +
> +cat >expect <<EOF
> +:100644 000000 c18147dc648481eeb65dc5e66628429a64843327 0000000000000000000000000000000000000000 D	hello.c
> +EOF
> +
> +git diff-tree -M -r U^1 U >actual
> +
> +test_expect_success 'U: validate filedelete result' '
> +	compare_diff_raw expect actual
> +'
> +
>  test_done

```

## Junio C Hamano, 2014-08-28 23:16

Subject: Re: [PATCH 2/2] fast-import: fix segfault in store_tree()
Message-ID: <xmqqwq9s6w8z.fsf@gitster.dls.corp.google.com>
URL: https://gitlist.dev/e/xmqqwq9s6w8z.fsf%40gitster.dls.corp.google.com
In-Reply-To: <1409237674-74185-3-git-send-email-satori@yandex-team.ru>

```
Maxim Bublis <satori@yandex-team.ru> writes:

> Branch tree is NULLified by filedelete command if we are trying
> to delete root tree. Add sanity check and use load_tree() in that case.
>
> Signed-off-by: Maxim Bublis <satori@yandex-team.ru>
> ---
>  fast-import.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/fast-import.c b/fast-import.c
> index d73f58c..b77f12c 100644
> --- a/fast-import.c
> +++ b/fast-import.c
> @@ -1419,7 +1419,7 @@ static void mktree(struct tree_content *t, int v, struct strbuf *b)
>  
>  static void store_tree(struct tree_entry *root)
>  {
> -	struct tree_content *t = root->tree;
> +	struct tree_content *t;
>  	unsigned int i, j, del;
>  	struct last_object lo = { STRBUF_INIT, 0, 0, /* no_swap */ 1 };
>  	struct object_entry *le = NULL;
> @@ -1427,6 +1427,10 @@ static void store_tree(struct tree_entry *root)
>  	if (!is_null_sha1(root->versions[1].sha1))
>  		return;
>  
> +	if (!root->tree)
> +		load_tree(root)

Missing ';'

> +	t = root->tree;
> +
>  	for (i = 0; i < t->entry_count; i++) {
>  		if (t->entries[i]->tree)
>  			store_tree(t->entries[i]);

```

## Maxim Bublis, 2014-08-29 11:37

Subject: Re: [PATCH 1/2] t9300: test filedelete root
Message-ID: <2F10795B-457A-493F-BF0F-CCCF0E64CF9C@yandex-team.ru>
URL: https://gitlist.dev/e/2F10795B-457A-493F-BF0F-CCCF0E64CF9C%40yandex-team.ru
In-Reply-To: <xmqqa96o8cxa.fsf@gitster.dls.corp.google.com>

```
On 29 авг. 2014 г., at 2:30, Junio C Hamano <gitster@pobox.com> wrote:

> You may have been concentrating on the "delete root" case, but as
> long as you claim "We add a series to test filedelete command", it
> would be sensible to test more typical cases of deleting files, not
> the entire tree as well, no?  Perhaps add three paths in the initial
> commit e.g. hello.c, good/night.txt and good/bye.txt, first remove
> good/night.txt and validate the result, then remove good/ directory
> and validate the result, and finally remove the whole thing and
> validate the result, or something like that?

Sure, I’ll add more tests for filedelete command.

> In a patch series that introduces a demonstration of existing
> breakage and then fixes the breakage in a separate patch, mark the
> test that shows the known breakage with test_expect_failure and then
> turn that line into test_expect_success in the later patch that
> fixes the breakage.

Ok, thanks.
```

## Maxim Bublis, 2014-08-29 11:40

Subject: Re: [PATCH 2/2] fast-import: fix segfault in store_tree()
Message-ID: <F3FA18F7-324F-4E57-A936-5A8FA986E1BC@yandex-team.ru>
URL: https://gitlist.dev/e/F3FA18F7-324F-4E57-A936-5A8FA986E1BC%40yandex-team.ru
In-Reply-To: <xmqqwq9s6w8z.fsf@gitster.dls.corp.google.com>

```

On 29 авг. 2014 г., at 3:16, Junio C Hamano <gitster@pobox.com> wrote:

> Missing ‘;'

Thanks, I’ll fix it. What a stupid mistype, I was writing some amount of Go code recently and it doesn’t use semicolons.

```