git/t/t6102-rev-list-unexpected-objects.sh
Jeff King 97dd512af7 rev-list: detect broken root trees
When the traversal machinery sees a commit without a root tree, it
assumes that the tree was part of a BOUNDARY commit, and quietly ignores
the tree. But it could also be caused by a commit whose root tree is
broken or missing.

Instead, let's die() when we see a NULL root tree. We can differentiate
it from the BOUNDARY case by seeing if the commit was actually parsed.
This covers that case, plus future-proofs us against any others where we
might try to show an unparsed commit.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-04-10 12:59:39 +09:00

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#!/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")" &&
git cat-file commit $commit >good-commit
'
test_expect_success 'setup unexpected non-blob entry' '
printf "100644 foo\0$(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_success 'traverse unexpected non-blob entry (seen)' '
test_must_fail git rev-list --objects $tree $broken_tree >output 2>&1 &&
test_i18ngrep "is not a blob" output
'
test_expect_success 'setup unexpected non-tree entry' '
printf "40000 foo\0$(echo $blob | hex2oct)" >broken-tree &&
broken_tree="$(git hash-object -w --literally -t tree broken-tree)"
'
test_expect_success 'traverse unexpected non-tree entry (lone)' '
test_must_fail git rev-list --objects $broken_tree
'
test_expect_success 'traverse unexpected non-tree entry (seen)' '
test_must_fail git rev-list --objects $blob $broken_tree >output 2>&1 &&
test_i18ngrep "is not a tree" output
'
test_expect_success 'setup unexpected non-commit parent' '
sed "/^author/ { h; s/.*/parent $blob/; G; }" <good-commit \
>broken-commit &&
broken_commit="$(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
'
test_expect_success 'traverse unexpected non-commit parent (seen)' '
test_must_fail git rev-list --objects $commit $broken_commit \
>output 2>&1 &&
test_i18ngrep "not a commit" output
'
test_expect_success 'setup unexpected non-tree root' '
sed -e "s/$tree/$blob/" <good-commit >broken-commit &&
broken_commit="$(git hash-object -w --literally -t commit \
broken-commit)"
'
test_expect_success 'traverse unexpected non-tree root (lone)' '
test_must_fail git rev-list --objects $broken_commit
'
test_expect_success 'traverse unexpected non-tree root (seen)' '
test_must_fail git rev-list --objects $blob $broken_commit \
>output 2>&1 &&
test_i18ngrep "not a tree" output
'
test_expect_success 'setup unexpected non-commit tag' '
git tag -a -m "tagged commit" tag $commit &&
git cat-file tag tag >good-tag &&
test_when_finished "git tag -d tag" &&
sed -e "s/$commit/$blob/" <good-tag >broken-tag &&
tag=$(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 $tree &&
git cat-file tag tag >good-tag &&
test_when_finished "git tag -d tag" &&
sed -e "s/$tree/$blob/" <good-tag >broken-tag &&
tag=$(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 $blob &&
git cat-file tag tag >good-tag &&
test_when_finished "git tag -d tag" &&
sed -e "s/$blob/$commit/" <good-tag >broken-tag &&
tag=$(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