rev-parse: let some options run outside repository

Once upon a time, you could use "--local-env-vars" and
"--resolve-git-dir" outside of any git repository, but they
had to come first on the command line. Commit 68889b4
(rev-parse: remove restrictions on some options, 2013-07-21)
put them into the normal option-parsing loop, fixing the
latter. But it inadvertently broke the former, as we call
setup_git_directory() before starting that loop.

We can note that those options don't care even conditionally
about whether we are in a git repo. So it's fine if we
simply wait to setup the repo until we see an option that
needs it.

However, there is one special exception we should make:
historically, rev-parse will set up the repository and read
config even if there are _no_ options. Some of the
tests in t1300 rely on this to check "git -c $config"
parsing. That's not mirroring real-world use, and we could
tweak the test.  But t0002 uses a bare "git rev-parse" to
check "are we in a git repository?". It's plausible that
real-world scripts are relying on this.

So let's cover this case specially, and treat an option-less
"rev-parse" as "see if we're in a repo".

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 7e074aad408ee7d63d86643878ff5c5bb311f732..3116d29d83564f899e2d75e710c76eefa1b5ab91 100644 (file)
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -505,6 +505,7 @@ N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 {
        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
+       int did_repo_setup = 0;
        int has_dashdash = 0;
        int output_prefix = 0;
        unsigned char sha1[20];
@@ -528,11 +529,40 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
                }
        }
 
-       prefix = setup_git_directory();
-       git_config(git_default_config, NULL);
+       /* No options; just report on whether we're in a git repo or not. */
+       if (argc == 1) {
+               setup_git_directory();
+               git_config(git_default_config, NULL);
+               return 0;
+       }
+
        for (i = 1; i < argc; i++) {
                const char *arg = argv[i];
 
+               if (!strcmp(arg, "--local-env-vars")) {
+                       int i;
+                       for (i = 0; local_repo_env[i]; i++)
+                               printf("%s\n", local_repo_env[i]);
+                       continue;
+               }
+               if (!strcmp(arg, "--resolve-git-dir")) {
+                       const char *gitdir = argv[++i];
+                       if (!gitdir)
+                               die("--resolve-git-dir requires an argument");
+                       gitdir = resolve_gitdir(gitdir);
+                       if (!gitdir)
+                               die("not a gitdir '%s'", argv[i]);
+                       puts(gitdir);
+                       continue;
+               }
+
+               /* The rest of the options require a git repository. */
+               if (!did_repo_setup) {
+                       prefix = setup_git_directory();
+                       git_config(git_default_config, NULL);
+                       did_repo_setup = 1;
+               }
+
                if (!strcmp(arg, "--git-path")) {
                        if (!argv[i + 1])
                                die("--git-path requires an argument");
@@ -706,12 +736,6 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
                                add_ref_exclusion(&ref_excludes, arg + 10);
                                continue;
                        }
-                       if (!strcmp(arg, "--local-env-vars")) {
-                               int i;
-                               for (i = 0; local_repo_env[i]; i++)
-                                       printf("%s\n", local_repo_env[i]);
-                               continue;
-                       }
                        if (!strcmp(arg, "--show-toplevel")) {
                                const char *work_tree = get_git_work_tree();
                                if (work_tree)
@@ -766,16 +790,6 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
                                puts(get_git_common_dir());
                                continue;
                        }
-                       if (!strcmp(arg, "--resolve-git-dir")) {
-                               const char *gitdir = argv[++i];
-                               if (!gitdir)
-                                       die("--resolve-git-dir requires an argument");
-                               gitdir = resolve_gitdir(gitdir);
-                               if (!gitdir)
-                                       die("not a gitdir '%s'", argv[i]);
-                               puts(gitdir);
-                               continue;
-                       }
                        if (!strcmp(arg, "--is-inside-git-dir")) {
                                printf("%s\n", is_inside_git_dir() ? "true"
                                                : "false");

diff --git a/t/t1515-rev-parse-outside-repo.sh b/t/t1515-rev-parse-outside-repo.sh
index ae330931b78ff30caa85dbe77d5d61d097d60b69..3ec2971ee5befd2ad8ffff5e099f05307746e6d1 100755 (executable)
--- a/t/t1515-rev-parse-outside-repo.sh
+++ b/t/t1515-rev-parse-outside-repo.sh
@@ -27,14 +27,14 @@ test_expect_success 'rev-parse --sq-quote' '
        test_cmp expect actual
 '
 
-test_expect_failure 'rev-parse --local-env-vars' '
+test_expect_success 'rev-parse --local-env-vars' '
        git rev-parse --local-env-vars >actual &&
        # we do not want to depend on the complete list here,
        # so just look for something plausible
        grep ^GIT_DIR actual
 '
 
-test_expect_failure 'rev-parse --resolve-git-dir' '
+test_expect_success 'rev-parse --resolve-git-dir' '
        git init --separate-git-dir repo dir &&
        test_must_fail git rev-parse --resolve-git-dir . &&
        echo "$(pwd)/repo" >expect &&