Merge branch 'da/rev-parse-verify-quiet'

"rev-parse --verify --quiet $name" is meant to quietly exit with a
non-zero status when $name is not a valid object name, but still
gave error messages in some cases.

* da/rev-parse-verify-quiet:
  stash: prefer --quiet over shell redirection of the standard error stream
  refs: make rev-parse --quiet actually quiet
  t1503: use test_must_be_empty
  Documentation: a note about stdout for git rev-parse --verify --quiet

Author: gitster

Documentation/git-rev-parse.txt

@@ -114,6 +114,7 @@ can be used.
 	Only meaningful in `--verify` mode. Do not output an error
 	message if the first argument is not a valid object name;
 	instead exit with non-zero status silently.
+	SHA-1s for valid object names are printed to stdout on success.
 
 --sq::
 	Usually the output is made one line per flag and

builtin/rev-parse.c

@@ -508,7 +508,9 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 	int has_dashdash = 0;
 	int output_prefix = 0;
 	unsigned char sha1[20];
+	unsigned int flags = 0;
 	const char *name = NULL;
+	struct object_context unused;
 
 	if (argc > 1 && !strcmp("--parseopt", argv[1]))
 		return cmd_parseopt(argc - 1, argv + 1, prefix);
@@ -596,6 +598,7 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 			}
 			if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 				quiet = 1;
+				flags |= GET_SHA1_QUIETLY;
 				continue;
 			}
 			if (!strcmp(arg, "--short") ||
@@ -818,7 +821,7 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 			name++;
 			type = REVERSED;
 		}
-		if (!get_sha1(name, sha1)) {
+		if (!get_sha1_with_context(name, flags, sha1, &unused)) {
 			if (verify)
 				revs_count++;
 			else

builtin/show-branch.c

@@ -723,6 +723,7 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 		char nth_desc[256];
 		char *ref;
 		int base = 0;
+		unsigned int flags = 0;
 
 		if (ac == 0) {
 			static const char *fake_av[2];
@@ -749,7 +750,7 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 				/* Ah, that is a date spec... */
 				unsigned long at;
 				at = approxidate(reflog_base);
-				read_ref_at(ref, at, -1, sha1, NULL,
+				read_ref_at(ref, flags, at, -1, sha1, NULL,
 					    NULL, NULL, &base);
 			}
 		}
@@ -760,7 +761,7 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 			unsigned long timestamp;
 			int tz;
 
-			if (read_ref_at(ref, 0, base+i, sha1, &logmsg,
+			if (read_ref_at(ref, flags, 0, base+i, sha1, &logmsg,
 					&timestamp, &tz, NULL)) {
 				reflog = i;
 				break;

git-stash.sh

@@ -50,7 +50,7 @@ clear_stash () {
 	then
 		die "$(gettext "git stash clear with parameters is unimplemented")"
 	fi
-	if current=$(git rev-parse --verify $ref_stash 2>/dev/null)
+	if current=$(git rev-parse --verify --quiet $ref_stash)
 	then
 		git update-ref -d $ref_stash $current
 	fi
@@ -292,7 +292,7 @@ save_stash () {
 }
 
 have_stash () {
-	git rev-parse --verify $ref_stash >/dev/null 2>&1
+	git rev-parse --verify --quiet $ref_stash >/dev/null
 }
 
 list_stash () {
@@ -392,12 +392,12 @@ parse_flags_and_rev()
 		;;
 	esac
 
-	REV=$(git rev-parse --quiet --symbolic --verify "$1" 2>/dev/null) || {
+	REV=$(git rev-parse --symbolic --verify --quiet "$1") || {
 		reference="$1"
 		die "$(eval_gettext "\$reference is not a valid reference")"
 	}
 
-	i_commit=$(git rev-parse --quiet --verify "$REV^2" 2>/dev/null) &&
+	i_commit=$(git rev-parse --verify --quiet "$REV^2") &&
 	set -- $(git rev-parse "$REV" "$REV^1" "$REV:" "$REV^1:" "$REV^2:" 2>/dev/null) &&
 	s=$1 &&
 	w_commit=$1 &&
@@ -409,7 +409,7 @@ parse_flags_and_rev()
 	test "$ref_stash" = "$(git rev-parse --symbolic-full-name "${REV%@*}")" &&
 	IS_STASH_REF=t
 
-	u_commit=$(git rev-parse --quiet --verify "$REV^3" 2>/dev/null) &&
+	u_commit=$(git rev-parse --verify --quiet "$REV^3") &&
 	u_tree=$(git rev-parse "$REV^3:" 2>/dev/null)
 }
 
@@ -531,7 +531,8 @@ drop_stash () {
 		die "$(eval_gettext "\${REV}: Could not drop stash entry")"
 
 	# clear_stash if we just dropped the last stash entry
-	git rev-parse --verify "$ref_stash@{0}" >/dev/null 2>&1 || clear_stash
+	git rev-parse --verify --quiet "$ref_stash@{0}" >/dev/null ||
+	clear_stash
 }
 
 apply_to_branch () {

refs.c

@@ -3159,7 +3159,7 @@ static int read_ref_at_ent_oldest(unsigned char *osha1, unsigned char *nsha1,
 	return 1;
 }
 
-int read_ref_at(const char *refname, unsigned long at_time, int cnt,
+int read_ref_at(const char *refname, unsigned int flags, unsigned long at_time, int cnt,
 		unsigned char *sha1, char **msg,
 		unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
 {
@@ -3177,8 +3177,12 @@ int read_ref_at(const char *refname, unsigned long at_time, int cnt,
 
 	for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb);
 
-	if (!cb.reccnt)
-		die("Log for %s is empty.", refname);
+	if (!cb.reccnt) {
+		if (flags & GET_SHA1_QUIETLY)
+			exit(128);
+		else
+			die("Log for %s is empty.", refname);
+	}
 	if (cb.found_it)
 		return 0;
 

refs.h

@@ -206,7 +206,8 @@ extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, cons
 int log_ref_setup(const char *refname, char *logfile, int bufsize);
 
 /** Reads log for the value of ref during at_time. **/
-extern int read_ref_at(const char *refname, unsigned long at_time, int cnt,
+extern int read_ref_at(const char *refname, unsigned int flags,
+		       unsigned long at_time, int cnt,
 		       unsigned char *sha1, char **msg,
 		       unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt);
 

sha1_name.c

@@ -432,7 +432,8 @@ static inline int upstream_mark(const char *string, int len)
 static int get_sha1_1(const char *name, int len, unsigned char *sha1, unsigned lookup_flags);
 static int interpret_nth_prior_checkout(const char *name, int namelen, struct strbuf *buf);
 
-static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
+static int get_sha1_basic(const char *str, int len, unsigned char *sha1,
+			  unsigned int flags)
 {
 	static const char *warn_msg = "refname '%.*s' is ambiguous.";
 	static const char *object_name_msg = N_(
@@ -511,7 +512,7 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 	if (!refs_found)
 		return -1;
 
-	if (warn_ambiguous_refs &&
+	if (warn_ambiguous_refs && !(flags & GET_SHA1_QUIETLY) &&
 	    (refs_found > 1 ||
 	     !get_short_sha1(str, len, tmp_sha1, GET_SHA1_QUIETLY)))
 		warning(warn_msg, len, str);
@@ -545,7 +546,7 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 				return -1;
 			}
 		}
-		if (read_ref_at(real_ref, at_time, nth, sha1, NULL,
+		if (read_ref_at(real_ref, flags, at_time, nth, sha1, NULL,
 				&co_time, &co_tz, &co_cnt)) {
 			if (!len) {
 				if (starts_with(real_ref, "refs/heads/")) {
@@ -557,11 +558,16 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 					len = 4;
 				}
 			}
-			if (at_time)
-				warning("Log for '%.*s' only goes "
-					"back to %s.", len, str,
-					show_date(co_time, co_tz, DATE_RFC2822));
-			else {
+			if (at_time) {
+				if (!(flags & GET_SHA1_QUIETLY)) {
+					warning("Log for '%.*s' only goes "
+						"back to %s.", len, str,
+						show_date(co_time, co_tz, DATE_RFC2822));
+				}
+			} else {
+				if (flags & GET_SHA1_QUIETLY) {
+					exit(128);
+				}
 				die("Log for '%.*s' only has %d entries.",
 				    len, str, co_cnt);
 			}
@@ -801,7 +807,7 @@ static int get_sha1_1(const char *name, int len, unsigned char *sha1, unsigned l
 	if (!ret)
 		return 0;
 
-	ret = get_sha1_basic(name, len, sha1);
+	ret = get_sha1_basic(name, len, sha1, lookup_flags);
 	if (!ret)
 		return 0;
 

t/t1503-rev-parse-verify.sh

@@ -72,15 +72,42 @@ test_expect_success 'fails with any bad rev or many good revs' '
 
 test_expect_success 'fails silently when using -q' '
 	test_must_fail git rev-parse --verify --quiet 2>error &&
-	test -z "$(cat error)" &&
+	test_must_be_empty error &&
 	test_must_fail git rev-parse -q --verify foo 2>error &&
-	test -z "$(cat error)" &&
+	test_must_be_empty error &&
 	test_must_fail git rev-parse --verify -q HEAD bar 2>error &&
-	test -z "$(cat error)" &&
+	test_must_be_empty error &&
 	test_must_fail git rev-parse --quiet --verify baz HEAD 2>error &&
-	test -z "$(cat error)" &&
+	test_must_be_empty error &&
 	test_must_fail git rev-parse -q --verify $HASH2 HEAD 2>error &&
-	test -z "$(cat error)"
+	test_must_be_empty error
+'
+
+test_expect_success 'fails silently when using -q with deleted reflogs' '
+	ref=$(git rev-parse HEAD) &&
+	: >.git/logs/refs/test &&
+	git update-ref -m "message for refs/test" refs/test "$ref" &&
+	git reflog delete --updateref --rewrite refs/test@{0} &&
+	test_must_fail git rev-parse -q --verify refs/test@{0} >error 2>&1 &&
+	test_must_be_empty error
+'
+
+test_expect_success 'fails silently when using -q with not enough reflogs' '
+	ref=$(git rev-parse HEAD) &&
+	: >.git/logs/refs/test2 &&
+	git update-ref -m "message for refs/test2" refs/test2 "$ref" &&
+	test_must_fail git rev-parse -q --verify refs/test2@{999} >error 2>&1 &&
+	test_must_be_empty error
+'
+
+test_expect_success 'succeeds silently with -q and reflogs that do not go far back enough in time' '
+	ref=$(git rev-parse HEAD) &&
+	: >.git/logs/refs/test3 &&
+	git update-ref -m "message for refs/test3" refs/test3 "$ref" &&
+	git rev-parse -q --verify refs/test3@{1.year.ago} >actual 2>error &&
+	test_must_be_empty error &&
+	echo "$ref" >expect &&
+	test_cmp expect actual
 '
 
 test_expect_success 'no stdout output on error' '