Subject: Re: [PATCH 2/7] t: introduce tests for unexpected object types

From: SZEDER Gábor <[email-masked]>
Date: Fri, 5 Apr 2019 12:50:33 +0200

On Thu, Apr 04, 2019 at 08:37:44PM -0700, Taylor Blau wrote:
> diff --git a/t/t6102-rev-list-unexpected-objects.sh b/t/t6102-rev-list-unexpected-objects.sh
> new file mode 100755
> index 0000000000..472b08528a
> --- /dev/null
> +++ b/t/t6102-rev-list-unexpected-objects.sh
> @@ -0,0 +1,123 @@
> +#!/bin/sh
> +
> +test_description='git rev-list should handle unexpected object types'
> +
> +. ./test-lib.sh
> +
> +test_expect_success 'setup well-formed objects' '
> +	blob="$(printf "foo" | git hash-object -w --stdin)" &&
> +	tree="$(printf "100644 blob $blob\tfoo" | git mktree)" &&
> +	commit="$(git commit-tree $tree -m "first commit")"
> +'
> +
> +test_expect_success 'setup unexpected non-blob entry' '
> +	printf "100644 foo\0$(echo $tree | hex2oct)" >broken-tree &&
> +	broken_tree="$(git hash-object -w --literally -t tree broken-tree)"
> +'
> +
> +test_expect_failure 'traverse unexpected non-blob entry (lone)' '
> +	test_must_fail git rev-list --objects $broken_tree
> +'
> +
> +test_expect_failure 'traverse unexpected non-blob entry (seen)' '
> +	test_must_fail git rev-list --objects $tree $broken_tree
> +'
> +
> +test_expect_success 'setup unexpected non-tree entry' '
> +	printf "40000 foo\0$(echo $blob | hex2oct)" >broken-tree &&
> +	broken_tree="$(git hash-object -w --literally -t tree broken-tree)"
> +'
> +
> +test_expect_failure 'traverse unexpected non-tree entry (lone)' '
> +	test_must_fail git rev-list --objects $broken_tree
> +'
> +
> +test_expect_failure 'traverse unexpected non-tree entry (seen)' '
> +	test_must_fail git rev-list --objects $blob $broken_tree >output 2>&1

This test saves standard output and error, but doesn't look at them.

> +'
> +
> +test_expect_success 'setup unexpected non-commit parent' '
> +	git cat-file commit $commit |
> +		perl -lpe "/^author/ && print q(parent $blob)" \
> +		>broken-commit &&

Don't run git commands upstream of a pipe, because the pipe hides
their exit code.  This applies to several other tests below as well.

Wouldn't a 'sed' one-liner suffice, so we won't have yet another perl
dependency?

> +	broken_commit="$(git hash-object -w --literally -t commit \
> +		broken-commit)"
> +'
> +
> +test_expect_success 'traverse unexpected non-commit parent (lone)' '
> +	test_must_fail git rev-list --objects $broken_commit >output 2>&1 &&
> +	test_i18ngrep "not a commit" output

Please make sure that this "not a commit" message goes to the file
descriptor it is supposed to, i.e., assuming it's part of an error
message:

  test_must_fail git rev-list .... 2>err &&
  test_i18ngrep "..." err

This applies to several other tests below and in other patches as
well.

> +'
> +
> +test_expect_success 'traverse unexpected non-commit parent (seen)' '
> +	test_must_fail git rev-list --objects $commit $broken_commit \
> +		>output 2>&1 &&
> +	test_i18ngrep "not a commit" output
> +'
> +
> +test_expect_success 'setup unexpected non-tree root' '
> +	git cat-file commit $commit |
> +	sed -e "s/$tree/$blob/" >broken-commit &&
> +	broken_commit="$(git hash-object -w --literally -t commit \
> +		broken-commit)"
> +'
> +
> +test_expect_failure 'traverse unexpected non-tree root (lone)' '
> +	test_must_fail git rev-list --objects $broken_commit
> +'
> +
> +test_expect_failure 'traverse unexpected non-tree root (seen)' '
> +	test_must_fail git rev-list --objects $blob $broken_commit
> +'
> +
> +test_expect_success 'setup unexpected non-commit tag' '
> +	git tag -a -m "tagged commit" tag $commit &&
> +	test_when_finished "git tag -d tag" &&
> +	git cat-file -p tag | sed -e "s/$commit/$blob/" >broken-tag &&
> +	tag=$(git hash-object -w --literally -t tag broken-tag)
> +'
> +
> +test_expect_success 'traverse unexpected non-commit tag (lone)' '
> +	test_must_fail git rev-list --objects $tag
> +'
> +
> +test_expect_success 'traverse unexpected non-commit tag (seen)' '
> +	test_must_fail git rev-list --objects $blob $tag >output 2>&1 &&
> +	test_i18ngrep "not a commit" output
> +'
> +
> +test_expect_success 'setup unexpected non-tree tag' '
> +	git tag -a -m "tagged tree" tag $tree &&
> +	test_when_finished "git tag -d tag" &&
> +	git cat-file -p tag |
> +	sed -e "s/$tree/$blob/" >broken-tag &&
> +	tag=$(git hash-object -w --literally -t tag broken-tag)
> +'
> +
> +test_expect_success 'traverse unexpected non-tree tag (lone)' '
> +	test_must_fail git rev-list --objects $tag
> +'
> +
> +test_expect_success 'traverse unexpected non-tree tag (seen)' '
> +	test_must_fail git rev-list --objects $blob $tag >output 2>&1 &&
> +	test_i18ngrep "not a tree" output
> +'
> +
> +test_expect_success 'setup unexpected non-blob tag' '
> +	git tag -a -m "tagged blob" tag $blob &&
> +	test_when_finished "git tag -d tag" &&
> +	git cat-file -p tag |
> +	sed -e "s/$blob/$commit/" >broken-tag &&
> +	tag=$(git hash-object -w --literally -t tag broken-tag)
> +'
> +
> +test_expect_failure 'traverse unexpected non-blob tag (lone)' '
> +	test_must_fail git rev-list --objects $tag
> +'
> +
> +test_expect_success 'traverse unexpected non-blob tag (seen)' '
> +	test_must_fail git rev-list --objects $commit $tag >output 2>&1 &&
> +	test_i18ngrep "not a blob" output
> +'
> +
> +test_done
> -- 
> 2.21.0.203.g358da99528
>