rev-parse: add --exclude-hidden= option

Add a new `--exclude-hidden=` option that is similar to the one we just
added to git-rev-list(1). Given a section name `uploadpack` or `receive`
as argument, it causes us to exclude all references that would be hidden
by the respective `$section.hideRefs` configuration.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Taylor Blau <[email protected]>

Author: pks-t

Documentation/git-rev-parse.txt

@@ -197,6 +197,13 @@ respectively, and they must begin with `refs/` when applied to `--glob`
 or `--all`. If a trailing '/{asterisk}' is intended, it must be given
 explicitly.
 
+--exclude-hidden=[receive|uploadpack]::
+	Do not include refs that would be hidden by `git-receive-pack` or
+	`git-upload-pack` by consulting the appropriate `receive.hideRefs` or
+	`uploadpack.hideRefs` configuration along with `transfer.hideRefs` (see
+	linkgit:git-config[1]). This option affects the next pseudo-ref option
+	`--all` or `--glob` and is cleared after processing them.
+
 --disambiguate=<prefix>::
 	Show every object whose name begins with the given prefix.
 	The <prefix> must be at least 4 hexadecimal digits long to

builtin/rev-parse.c

@@ -876,10 +876,14 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 				continue;
 			}
 			if (opt_with_value(arg, "--branches", &arg)) {
+				if (ref_excludes.hidden_refs_configured)
+					return error(_("--exclude-hidden cannot be used together with --branches"));
 				handle_ref_opt(arg, "refs/heads/");
 				continue;
 			}
 			if (opt_with_value(arg, "--tags", &arg)) {
+				if (ref_excludes.hidden_refs_configured)
+					return error(_("--exclude-hidden cannot be used together with --tags"));
 				handle_ref_opt(arg, "refs/tags/");
 				continue;
 			}
@@ -888,13 +892,19 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 				continue;
 			}
 			if (opt_with_value(arg, "--remotes", &arg)) {
+				if (ref_excludes.hidden_refs_configured)
+					return error(_("--exclude-hidden cannot be used together with --remotes"));
 				handle_ref_opt(arg, "refs/remotes/");
 				continue;
 			}
 			if (skip_prefix(arg, "--exclude=", &arg)) {
 				add_ref_exclusion(&ref_excludes, arg);
 				continue;
 			}
+			if (skip_prefix(arg, "--exclude-hidden=", &arg)) {
+				exclude_hidden_refs(&ref_excludes, arg);
+				continue;
+			}
 			if (!strcmp(arg, "--show-toplevel")) {
 				const char *work_tree = get_git_work_tree();
 				if (work_tree)

t/t6018-rev-list-glob.sh

@@ -187,6 +187,46 @@ test_expect_success 'rev-parse --exclude=ref with --remotes=glob' '
 	compare rev-parse "--exclude=upstream/x --remotes=upstream/*" "upstream/one upstream/two"
 '
 
+for section in receive uploadpack
+do
+	test_expect_success "rev-parse --exclude-hidden=$section with --all" '
+		compare "-c transfer.hideRefs=refs/remotes/ rev-parse" "--branches --tags" "--exclude-hidden=$section --all"
+	'
+
+	test_expect_success "rev-parse --exclude-hidden=$section with --all" '
+		compare "-c transfer.hideRefs=refs/heads/subspace/ rev-parse" "--exclude=refs/heads/subspace/* --all" "--exclude-hidden=$section --all"
+	'
+
+	test_expect_success "rev-parse --exclude-hidden=$section with --glob" '
+		compare "-c transfer.hideRefs=refs/heads/subspace/ rev-parse" "--exclude=refs/heads/subspace/* --glob=refs/heads/*" "--exclude-hidden=$section --glob=refs/heads/*"
+	'
+
+	test_expect_success "rev-parse --exclude-hidden=$section can be passed once per pseudo-ref" '
+		compare "-c transfer.hideRefs=refs/remotes/ rev-parse" "--branches --tags --branches --tags" "--exclude-hidden=$section --all --exclude-hidden=$section --all"
+	'
+
+	test_expect_success "rev-parse --exclude-hidden=$section can only be passed once per pseudo-ref" '
+		echo "fatal: --exclude-hidden= passed more than once" >expected &&
+		test_must_fail git rev-parse --exclude-hidden=$section --exclude-hidden=$section 2>err &&
+		test_cmp expected err
+	'
+
+	for pseudoopt in branches tags remotes
+	do
+		test_expect_success "rev-parse --exclude-hidden=$section fails with --$pseudoopt" '
+			echo "error: --exclude-hidden cannot be used together with --$pseudoopt" >expected &&
+			test_must_fail git rev-parse --exclude-hidden=$section --$pseudoopt 2>err &&
+			test_cmp expected err
+		'
+
+		test_expect_success "rev-parse --exclude-hidden=$section fails with --$pseudoopt=pattern" '
+			echo "error: --exclude-hidden cannot be used together with --$pseudoopt" >expected &&
+			test_must_fail git rev-parse --exclude-hidden=$section --$pseudoopt=pattern 2>err &&
+			test_cmp expected err
+		'
+	done
+done
+
 test_expect_success 'rev-list --exclude=glob with --branches=glob' '
 	compare rev-list "--exclude=subspace-* --branches=sub*" "subspace/one subspace/two"
 '