git/t/t1500-rev-parse.sh
Victoria Dye 5305474ec4 ref-cache.c: fix prefix matching in ref iteration
Update 'cache_ref_iterator_advance' to skip over refs that are not matched
by the given prefix.

Currently, a ref entry is considered "matched" if the entry name is fully
contained within the prefix:

* prefix: "refs/heads/v1"
* entry: "refs/heads/v1.0"

OR if the prefix is fully contained in the entry name:

* prefix: "refs/heads/v1.0"
* entry: "refs/heads/v1"

The first case is always correct, but the second is only correct if the ref
cache entry is a directory, for example:

* prefix: "refs/heads/example"
* entry: "refs/heads/"

Modify the logic in 'cache_ref_iterator_advance' to reflect these
expectations:

1. If 'overlaps_prefix' returns 'PREFIX_EXCLUDES_DIR', then the prefix and
   ref cache entry do not overlap at all. Skip this entry.
2. If 'overlaps_prefix' returns 'PREFIX_WITHIN_DIR', then the prefix matches
   inside this entry if it is a directory. Skip if the entry is not a
   directory, otherwise iterate over it.
3. Otherwise, 'overlaps_prefix' returned 'PREFIX_CONTAINS_DIR', indicating
   that the cache entry (directory or not) is fully contained by or equal to
   the prefix. Iterate over this entry.

Note that condition 2 relies on the names of directory entries having the
appropriate trailing slash. The existing function documentation of
'create_dir_entry' explicitly calls out the trailing slash requirement, so
this is a safe assumption to make.

This bug generally doesn't have any user-facing impact, since it requires:

1. using a non-empty prefix without a trailing slash in an iteration like
   'for_each_fullref_in',
2. the callback to said iteration not reapplying the original filter (as
   for-each-ref does) to ensure unmatched refs are skipped, and
3. the repository having one or more refs that match part of, but not all
   of, the prefix.

However, there are some niche scenarios that meet those criteria
(specifically, 'rev-parse --bisect' and '(log|show|shortlog) --bisect'). Add
tests covering those cases to demonstrate the fix in this patch.

Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-10-09 15:53:13 -07:00

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#!/bin/sh
test_description='test git rev-parse'
GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
test_one () {
dir="$1" &&
expect="$2" &&
shift &&
shift &&
echo "$expect" >expect &&
git -C "$dir" rev-parse "$@" >actual &&
test_cmp expect actual
}
# usage: [options] label is-bare is-inside-git is-inside-work prefix git-dir absolute-git-dir
test_rev_parse () {
d=
bare=
gitdir=
while :
do
case "$1" in
-C) d="$2"; shift; shift ;;
-b) case "$2" in
[tfu]*) bare="$2"; shift; shift ;;
*) error "test_rev_parse: bogus core.bare value '$2'" ;;
esac ;;
-g) gitdir="$2"; shift; shift ;;
-*) error "test_rev_parse: unrecognized option '$1'" ;;
*) break ;;
esac
done
name=$1
shift
for o in --is-bare-repository \
--is-inside-git-dir \
--is-inside-work-tree \
--show-prefix \
--git-dir \
--absolute-git-dir
do
test $# -eq 0 && break
expect="$1"
test_expect_success "$name: $o" '
if test -n "$gitdir"
then
test_when_finished "unset GIT_DIR" &&
GIT_DIR="$gitdir" &&
export GIT_DIR
fi &&
case "$bare" in
t*) test_config ${d:+-C} ${d:+"$d"} core.bare true ;;
f*) test_config ${d:+-C} ${d:+"$d"} core.bare false ;;
u*) test_unconfig ${d:+-C} ${d:+"$d"} core.bare ;;
esac &&
echo "$expect" >expect &&
git ${d:+-C} ${d:+"$d"} rev-parse $o >actual &&
test_cmp expect actual
'
shift
done
}
ROOT=$(pwd)
test_expect_success 'setup' '
mkdir -p sub/dir work &&
cp -R .git repo.git &&
git checkout -B main &&
test_commit abc &&
git checkout -b side &&
test_commit def &&
git checkout main &&
git worktree add worktree side
'
test_rev_parse toplevel false false true '' .git "$ROOT/.git"
test_rev_parse -C .git .git/ false true false '' . "$ROOT/.git"
test_rev_parse -C .git/objects .git/objects/ false true false '' "$ROOT/.git" "$ROOT/.git"
test_rev_parse -C sub/dir subdirectory false false true sub/dir/ "$ROOT/.git" "$ROOT/.git"
test_rev_parse -b t 'core.bare = true' true false false
test_rev_parse -b u 'core.bare undefined' false false true
test_rev_parse -C work -g ../.git -b f 'GIT_DIR=../.git, core.bare = false' false false true '' "../.git" "$ROOT/.git"
test_rev_parse -C work -g ../.git -b t 'GIT_DIR=../.git, core.bare = true' true false false ''
test_rev_parse -C work -g ../.git -b u 'GIT_DIR=../.git, core.bare undefined' false false true ''
test_rev_parse -C work -g ../repo.git -b f 'GIT_DIR=../repo.git, core.bare = false' false false true '' "../repo.git" "$ROOT/repo.git"
test_rev_parse -C work -g ../repo.git -b t 'GIT_DIR=../repo.git, core.bare = true' true false false ''
test_rev_parse -C work -g ../repo.git -b u 'GIT_DIR=../repo.git, core.bare undefined' false false true ''
test_expect_success 'rev-parse --path-format=absolute' '
test_one "." "$ROOT/.git" --path-format=absolute --git-dir &&
test_one "." "$ROOT/.git" --path-format=absolute --git-common-dir &&
test_one "sub/dir" "$ROOT/.git" --path-format=absolute --git-dir &&
test_one "sub/dir" "$ROOT/.git" --path-format=absolute --git-common-dir &&
test_one "worktree" "$ROOT/.git/worktrees/worktree" --path-format=absolute --git-dir &&
test_one "worktree" "$ROOT/.git" --path-format=absolute --git-common-dir &&
test_one "." "$ROOT" --path-format=absolute --show-toplevel &&
test_one "." "$ROOT/.git/objects" --path-format=absolute --git-path objects &&
test_one "." "$ROOT/.git/objects/foo/bar/baz" --path-format=absolute --git-path objects/foo/bar/baz
'
test_expect_success 'rev-parse --path-format=relative' '
test_one "." ".git" --path-format=relative --git-dir &&
test_one "." ".git" --path-format=relative --git-common-dir &&
test_one "sub/dir" "../../.git" --path-format=relative --git-dir &&
test_one "sub/dir" "../../.git" --path-format=relative --git-common-dir &&
test_one "worktree" "../.git/worktrees/worktree" --path-format=relative --git-dir &&
test_one "worktree" "../.git" --path-format=relative --git-common-dir &&
test_one "." "./" --path-format=relative --show-toplevel &&
test_one "." ".git/objects" --path-format=relative --git-path objects &&
test_one "." ".git/objects/foo/bar/baz" --path-format=relative --git-path objects/foo/bar/baz
'
test_expect_success '--path-format=relative does not affect --absolute-git-dir' '
git rev-parse --path-format=relative --absolute-git-dir >actual &&
echo "$ROOT/.git" >expect &&
test_cmp expect actual
'
test_expect_success '--path-format can change in the middle of the command line' '
git rev-parse --path-format=absolute --git-dir --path-format=relative --git-path objects/foo/bar >actual &&
cat >expect <<-EOF &&
$ROOT/.git
.git/objects/foo/bar
EOF
test_cmp expect actual
'
test_expect_success '--path-format does not segfault without an argument' '
test_must_fail git rev-parse --path-format
'
test_expect_success 'git-common-dir from worktree root' '
echo .git >expect &&
git rev-parse --git-common-dir >actual &&
test_cmp expect actual
'
test_expect_success 'git-common-dir inside sub-dir' '
mkdir -p path/to/child &&
test_when_finished "rm -rf path" &&
echo "$(git -C path/to/child rev-parse --show-cdup).git" >expect &&
git -C path/to/child rev-parse --git-common-dir >actual &&
test_cmp expect actual
'
test_expect_success 'git-path from worktree root' '
echo .git/objects >expect &&
git rev-parse --git-path objects >actual &&
test_cmp expect actual
'
test_expect_success 'git-path inside sub-dir' '
mkdir -p path/to/child &&
test_when_finished "rm -rf path" &&
echo "$(git -C path/to/child rev-parse --show-cdup).git/objects" >expect &&
git -C path/to/child rev-parse --git-path objects >actual &&
test_cmp expect actual
'
test_expect_success 'rev-parse --is-shallow-repository in shallow repo' '
test_commit test_commit &&
echo true >expect &&
git clone --depth 1 --no-local . shallow &&
test_when_finished "rm -rf shallow" &&
git -C shallow rev-parse --is-shallow-repository >actual &&
test_cmp expect actual
'
test_expect_success 'rev-parse --is-shallow-repository in non-shallow repo' '
echo false >expect &&
git rev-parse --is-shallow-repository >actual &&
test_cmp expect actual
'
test_expect_success 'rev-parse --show-object-format in repo' '
test_oid algo >expect &&
git rev-parse --show-object-format >actual &&
test_cmp expect actual &&
git rev-parse --show-object-format=storage >actual &&
test_cmp expect actual &&
git rev-parse --show-object-format=input >actual &&
test_cmp expect actual &&
git rev-parse --show-object-format=output >actual &&
test_cmp expect actual &&
test_must_fail git rev-parse --show-object-format=squeamish-ossifrage 2>err &&
grep "unknown mode for --show-object-format: squeamish-ossifrage" err
'
test_expect_success '--show-toplevel from subdir of working tree' '
pwd >expect &&
git -C sub/dir rev-parse --show-toplevel >actual &&
test_cmp expect actual
'
test_expect_success '--show-toplevel from inside .git' '
test_must_fail git -C .git rev-parse --show-toplevel
'
test_expect_success 'showing the superproject correctly' '
git rev-parse --show-superproject-working-tree >out &&
test_must_be_empty out &&
test_create_repo super &&
test_commit -C super test_commit &&
test_create_repo sub &&
test_commit -C sub test_commit &&
git -c protocol.file.allow=always \
-C super submodule add ../sub dir/sub &&
echo $(pwd)/super >expect &&
git -C super/dir/sub rev-parse --show-superproject-working-tree >out &&
test_cmp expect out &&
test_commit -C super submodule_add &&
git -C super checkout -b branch1 &&
git -C super/dir/sub checkout -b branch1 &&
test_commit -C super/dir/sub branch1_commit &&
git -C super add dir/sub &&
test_commit -C super branch1_commit &&
git -C super checkout -b branch2 main &&
git -C super/dir/sub checkout -b branch2 main &&
test_commit -C super/dir/sub branch2_commit &&
git -C super add dir/sub &&
test_commit -C super branch2_commit &&
test_must_fail git -C super merge branch1 &&
git -C super/dir/sub rev-parse --show-superproject-working-tree >out &&
test_cmp expect out
'
# at least one external project depends on this behavior:
test_expect_success 'rev-parse --since= unsqueezed ordering' '
x1=--since=1970-01-01T00:00:01Z &&
x2=--since=1970-01-01T00:00:02Z &&
x3=--since=1970-01-01T00:00:03Z &&
git rev-parse $x1 $x1 $x3 $x2 >actual &&
cat >expect <<-EOF &&
--max-age=1
--max-age=1
--max-age=3
--max-age=2
EOF
test_cmp expect actual
'
test_expect_success 'rev-parse --bisect includes bad, excludes good' '
test_commit_bulk 6 &&
git update-ref refs/bisect/bad-1 HEAD~1 &&
git update-ref refs/bisect/b HEAD~2 &&
git update-ref refs/bisect/bad-3 HEAD~3 &&
git update-ref refs/bisect/good-3 HEAD~3 &&
git update-ref refs/bisect/bad-4 HEAD~4 &&
git update-ref refs/bisect/go HEAD~4 &&
# Note: refs/bisect/b and refs/bisect/go should be ignored because they
# do not match the refs/bisect/bad or refs/bisect/good prefixes.
cat >expect <<-EOF &&
refs/bisect/bad-1
refs/bisect/bad-3
refs/bisect/bad-4
^refs/bisect/good-3
EOF
git rev-parse --symbolic-full-name --bisect >actual &&
test_cmp expect actual
'
test_done