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difftool: avoid $GIT_DIR and $GIT_WORK_TREE

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Environment variables are global and hard to reason about.
Use the `--git-dir` and `--work-tree` arguments when invoking `git`
instead of relying on the environment.

Add a test to ensure that difftool's dir-diff feature works when these
variables are present in the environment.

Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
David Aguilar 2016-07-18 20:57:55 -07:00 committed by Junio C Hamano
parent 9ec26e7977
commit 98f917ed42
2 changed files with 20 additions and 21 deletions
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27
git-difftool.perl
View file

@ -83,20 +83,17 @@ sub changed_files
{
my ($repo_path, $index, $worktree) = @_;
$ENV{GIT_INDEX_FILE} = $index;
$ENV{GIT_WORK_TREE} = $worktree;
my $must_unset_git_dir = 0;
if (not defined($ENV{GIT_DIR})) {
$must_unset_git_dir = 1;
$ENV{GIT_DIR} = $repo_path;
}
my @refreshargs = qw/update-index --really-refresh -q --unmerged/;
my @gitargs = qw/diff-files --name-only -z/;
my @gitargs = ('--git-dir', $repo_path, '--work-tree', $worktree);
my @refreshargs = (
@gitargs, 'update-index',
'--really-refresh', '-q', '--unmerged');
try {
Git::command_oneline(@refreshargs);
} catch Git::Error::Command with {};
my $line = Git::command_oneline(@gitargs);
my @diffargs = (@gitargs, 'diff-files', '--name-only', '-z');
my $line = Git::command_oneline(@diffargs);
my @files;
if (defined $line) {
@files = split('\0', $line);
@ -105,8 +102,6 @@ sub changed_files
}
delete($ENV{GIT_INDEX_FILE});
delete($ENV{GIT_WORK_TREE});
delete($ENV{GIT_DIR}) if ($must_unset_git_dir);
return map { $_ => 1 } @files;
}
@ -204,15 +199,6 @@ sub setup_dir_diff
mkpath($ldir) or exit_cleanup($tmpdir, 1);
mkpath($rdir) or exit_cleanup($tmpdir, 1);
# If $GIT_DIR is not set prior to calling 'git update-index' and
# 'git checkout-index', then those commands will fail if difftool
# is called from a directory other than the repo root.
my $must_unset_git_dir = 0;
if (not defined($ENV{GIT_DIR})) {
$must_unset_git_dir = 1;
$ENV{GIT_DIR} = $repo_path;
}
# Populate the left and right directories based on each index file
my ($inpipe, $ctx);
$ENV{GIT_INDEX_FILE} = "$tmpdir/lindex";
@ -241,7 +227,6 @@ sub setup_dir_diff
# If $GIT_DIR was explicitly set just for the update/checkout
# commands, then it should be unset before continuing.
delete($ENV{GIT_DIR}) if ($must_unset_git_dir);
delete($ENV{GIT_INDEX_FILE});
# Changes in the working tree need special treatment since they are

14
t/t7800-difftool.sh
View file

@ -412,6 +412,20 @@ run_dir_diff_test 'difftool --dir-diff from subdirectory' '
)
'
run_dir_diff_test 'difftool --dir-diff from subdirectory with GIT_DIR set' '
(
GIT_DIR=$(pwd)/.git &&
export GIT_DIR &&
GIT_WORK_TREE=$(pwd) &&
export GIT_WORK_TREE &&
cd sub &&
git difftool --dir-diff $symlinks --extcmd ls \
branch -- sub >output &&
grep sub output &&
! grep file output
)
'
run_dir_diff_test 'difftool --dir-diff when worktree file is missing' '
test_when_finished git reset --hard &&
rm file2 &&