On 06/07, Johannes Schindelin wrote:
> We already taught alias_lookup() to use the early config if the .git/
> directory was not yet discovered, of course, however, since we called
> setup_git_directory_gently() before expanding the alias (if any), we
> only used the early config code path only if outside of any Git-managed
> directory.
>
> With this commit, we finally switch over to really using the early
> config code path.
>
> Rather than just chdir()ing into the indicated directory in case of an
> alias expanding to a shell command, we simply set up the .git/ directory
> so that e.g. GIT_PREFIX is set as expected.
>
> This change also fixes a known issue where Git tried to read the pager
> config from an incorrect path in a subdirectory of a Git worktree if an
> alias expanded to a shell command.
>
> Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
> ---
> git.c | 59
> +++++++-------------------------------------------------
> t/t7006-pager.sh | 2 +-
> 2 files changed, 8 insertions(+), 53 deletions(-)
>
> diff --git a/git.c b/git.c
> index 4163beaead4..c82cd455948 100644
> --- a/git.c
> +++ b/git.c
> @@ -16,50 +16,6 @@ const char git_more_info_string[] =
> "to read about a specific subcommand or concept.");
>
> static int use_pager = -1;
> -static char *orig_cwd;
> -static const char *env_names[] = {
> - GIT_DIR_ENVIRONMENT,
> - GIT_WORK_TREE_ENVIRONMENT,
> - GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
> - GIT_PREFIX_ENVIRONMENT
> -};
> -static char *orig_env[4];
> -static int save_restore_env_balance;
> -
> -static void save_env_before_alias(void)
> -{
> - int i;
> -
> - assert(save_restore_env_balance == 0);
> - save_restore_env_balance = 1;
> - orig_cwd = xgetcwd();
> - for (i = 0; i < ARRAY_SIZE(env_names); i++) {
> - orig_env[i] = getenv(env_names[i]);
> - orig_env[i] = xstrdup_or_null(orig_env[i]);
> - }
> -}
> -
> -static void restore_env(int external_alias)
> -{
> - int i;
> -
> - assert(save_restore_env_balance == 1);
> - save_restore_env_balance = 0;
> - if (!external_alias && orig_cwd && chdir(orig_cwd))
> - die_errno("could not move to %s", orig_cwd);
> - free(orig_cwd);
> - for (i = 0; i < ARRAY_SIZE(env_names); i++) {
> - if (external_alias &&
> - !strcmp(env_names[i], GIT_PREFIX_ENVIRONMENT))
> - continue;
> - if (orig_env[i]) {
> - setenv(env_names[i], orig_env[i], 1);
> - free(orig_env[i]);
> - } else {
> - unsetenv(env_names[i]);
> - }
> - }
> -}
I like seeing chunks of old code being deleted :D
>
> static void commit_pager_choice(void) {
> switch (use_pager) {
> @@ -245,36 +201,37 @@ static int handle_options(const char ***argv, int
> *argc, int *envchanged)
>
> static int handle_alias(int *argcp, const char ***argv)
> {
> + struct strbuf worktree_dir = STRBUF_INIT;
> int envchanged = 0, ret = 0, saved_errno = errno;
> int count, option_count;
> const char **new_argv;
> const char *alias_command;
> char *alias_string;
> - int unused_nongit;
> -
> - save_env_before_alias();
> - setup_git_directory_gently(&unused_nongit);
>
> alias_command = (*argv)[0];
> - alias_string = alias_lookup(alias_command, NULL);
> + alias_string = alias_lookup(alias_command, &worktree_dir);
> if (alias_string) {
> if (alias_string[0] == '!') {
> struct child_process child = CHILD_PROCESS_INIT;
>
> + if (worktree_dir.len)
> + setup_git_directory();
So if there is a worktree then we run the setup code explicitly. I
assume that is to ensure that all envvars are setup properly before
running the alias. Just interesting to note that the actual value of
worktree_dir is never used, its just used essentially as a boolean
indicator of there being a worktree/gitdir/repository. I'm not
suggesting to change from what you have here, its just food for thought.
> +
> commit_pager_choice();
> - restore_env(1);
>
> child.use_shell = 1;
> argv_array_push(&child.args, alias_string + 1);
> argv_array_pushv(&child.args, (*argv) + 1);
>
> ret = run_command(&child);
> + strbuf_release(&worktree_dir);
> if (ret >= 0) /* normal exit */
> exit(ret);
>
> die_errno("While expanding alias '%s': '%s'",
> alias_command, alias_string + 1);
> }
> + strbuf_release(&worktree_dir);
> count = split_cmdline(alias_string, &new_argv);
> if (count < 0)
> die("Bad alias.%s string: %s", alias_command,
> @@ -308,8 +265,6 @@ static int handle_alias(int *argcp, const char ***argv)
> ret = 1;
> }
>
> - restore_env(0);
> -
> errno = saved_errno;
>
> return ret;
> diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
> index 83881ec3a0c..20b4d83c281 100755
> --- a/t/t7006-pager.sh
> +++ b/t/t7006-pager.sh
> @@ -391,7 +391,7 @@ test_expect_success TTY 'core.pager in repo config works
> and retains cwd' '
> )
> '
>
> -test_expect_failure TTY 'core.pager is found via alias in subdirectory' '
> +test_expect_success TTY 'core.pager is found via alias in subdirectory' '
> sane_unset GIT_PAGER &&
> test_config core.pager "cat >via-alias" &&
> (
> --
> 2.13.0.windows.1.460.g13f583bedb5
--
Brandon Williams
