Merge branch 'sp/refspec-match'

* sp/refspec-match:
  refactor fetch's ref matching to use refname_match()
  push: use same rules as git-rev-parse to resolve refspecs
  add refname_match()
  push: support pushing HEAD to real branch name

Documentation/git-send-pack.txt

@@ -85,7 +85,9 @@ Each pattern pair consists of the source side (before the colon)
 and the destination side (after the colon).  The ref to be
 pushed is determined by finding a match that matches the source
 side, and where it is pushed is determined by using the
-destination side.
+destination side. The rules used to match a ref are the same
+rules used by gitlink:git-rev-parse[1] to resolve a symbolic ref
+name.
 
  - It is an error if <src> does not match exactly one of the
    local refs.

builtin-push.c

@@ -44,6 +44,15 @@ static void set_refspecs(const char **refs, int nr)
 			strcat(tag, refs[i]);
 			ref = tag;
 		}
+		if (!strcmp("HEAD", ref)) {
+			unsigned char sha1_dummy[20];
+			ref = resolve_ref(ref, sha1_dummy, 1, NULL);
+			if (!ref)
+				die("HEAD cannot be resolved.");
+			if (prefixcmp(ref, "refs/heads/"))
+				die("HEAD cannot be resolved to branch.");
+			ref = xstrdup(ref + 11);
+		}
 		add_refspec(ref);
 	}
 }

cache.h

@@ -423,6 +423,10 @@ extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *
 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 
+extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
+extern const char *ref_rev_parse_rules[];
+extern const char *ref_fetch_rules[];
+
 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 extern int validate_headref(const char *ref);
 

refs.c

@@ -643,6 +643,37 @@ int check_ref_format(const char *ref)
 	}
 }
 
+const char *ref_rev_parse_rules[] = {
+	"%.*s",
+	"refs/%.*s",
+	"refs/tags/%.*s",
+	"refs/heads/%.*s",
+	"refs/remotes/%.*s",
+	"refs/remotes/%.*s/HEAD",
+	NULL
+};
+
+const char *ref_fetch_rules[] = {
+	"%.*s",
+	"refs/%.*s",
+	"refs/heads/%.*s",
+	NULL
+};
+
+int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
+{
+	const char **p;
+	const int abbrev_name_len = strlen(abbrev_name);
+
+	for (p = rules; *p; p++) {
+		if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
 static struct ref_lock *verify_lock(struct ref_lock *lock,
 	const unsigned char *old_sha1, int mustexist)
 {

remote.c

@@ -419,25 +419,6 @@ int remote_has_url(struct remote *remote, const char *url)
 	return 0;
 }
 
-/*
- * Returns true if, under the matching rules for fetching, name is the
- * same as the given full name.
- */
-static int ref_matches_abbrev(const char *name, const char *full)
-{
-	if (!prefixcmp(name, "refs/") || !strcmp(name, "HEAD"))
-		return !strcmp(name, full);
-	if (prefixcmp(full, "refs/"))
-		return 0;
-	if (!prefixcmp(name, "heads/") ||
-	    !prefixcmp(name, "tags/") ||
-	    !prefixcmp(name, "remotes/"))
-		return !strcmp(name, full + 5);
-	if (prefixcmp(full + 5, "heads/"))
-		return 0;
-	return !strcmp(full + 11, name);
-}
-
 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 {
 	int find_src = refspec->src == NULL;
@@ -533,10 +514,7 @@ static int count_refspec_match(const char *pattern,
 		char *name = refs->name;
 		int namelen = strlen(name);
 
-		if (namelen < patlen ||
+		if (!refname_match(pattern, name, ref_rev_parse_rules))
-		    memcmp(name + namelen - patlen, pattern, patlen))
-			continue;
-		if (namelen != patlen && name[namelen - patlen - 1] != '/')
 			continue;
 
 		/* A match is "weak" if it is with refs outside
@@ -818,7 +796,7 @@ int branch_merge_matches(struct branch *branch,
 {
 	if (!branch || i < 0 || i >= branch->merge_nr)
 		return 0;
-	return ref_matches_abbrev(branch->merge[i]->src, refname);
+	return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
 }
 
 static struct ref *get_expanded_map(const struct ref *remote_refs,
@@ -857,7 +835,7 @@ static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const c
 {
 	const struct ref *ref;
 	for (ref = refs; ref; ref = ref->next) {
-		if (ref_matches_abbrev(name, ref->name))
+		if (refname_match(name, ref->name, ref_fetch_rules))
 			return ref;
 	}
 	return NULL;

sha1_name.c

@@ -239,23 +239,13 @@ static int ambiguous_path(const char *path, int len)
 	return slash;
 }
 
-static const char *ref_fmt[] = {
-	"%.*s",
-	"refs/%.*s",
-	"refs/tags/%.*s",
-	"refs/heads/%.*s",
-	"refs/remotes/%.*s",
-	"refs/remotes/%.*s/HEAD",
-	NULL
-};
-
 int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
 {
 	const char **p, *r;
 	int refs_found = 0;
 
 	*ref = NULL;
-	for (p = ref_fmt; *p; p++) {
+	for (p = ref_rev_parse_rules; *p; p++) {
 		unsigned char sha1_from_ref[20];
 		unsigned char *this_result;
 
@@ -277,7 +267,7 @@ int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
 	int logs_found = 0;
 
 	*log = NULL;
-	for (p = ref_fmt; *p; p++) {
+	for (p = ref_rev_parse_rules; *p; p++) {
 		struct stat st;
 		unsigned char hash[20];
 		char path[PATH_MAX];

t/t5510-fetch.sh

@@ -95,6 +95,31 @@ test_expect_success 'fetch following tags' '
 
 '
 
+test_expect_failure 'fetch must not resolve short tag name' '
+
+	cd "$D" &&
+
+	mkdir five &&
+	cd five &&
+	git init &&
+
+	git fetch .. anno:five
+
+'
+
+test_expect_failure 'fetch must not resolve short remote name' '
+
+	cd "$D" &&
+	git-update-ref refs/remotes/six/HEAD HEAD
+
+	mkdir six &&
+	cd six &&
+	git init &&
+
+	git fetch .. six:six
+
+'
+
 test_expect_success 'create bundle 1' '
 	cd "$D" &&
 	echo >file updated again by origin &&

t/t5516-fetch-push.sh

@@ -145,11 +145,21 @@ test_expect_success 'push with no ambiguity (1)' '
 test_expect_success 'push with no ambiguity (2)' '
 
 	mk_test remotes/origin/master &&
-	git push testrepo master:master &&
+	git push testrepo master:origin/master &&
 	check_push_result $the_commit remotes/origin/master
 
 '
 
+test_expect_success 'push with colon-less refspec, no ambiguity' '
+
+	mk_test heads/master heads/t/master &&
+	git branch -f t/master master &&
+	git push testrepo master &&
+	check_push_result $the_commit heads/master &&
+	check_push_result $the_first_commit heads/t/master
+
+'
+
 test_expect_success 'push with weak ambiguity (1)' '
 
 	mk_test heads/master remotes/origin/master &&
@@ -244,6 +254,23 @@ test_expect_success 'push with colon-less refspec (4)' '
 
 '
 
+test_expect_success 'push with HEAD' '
+
+	mk_test heads/master &&
+	git checkout master &&
+	git push testrepo HEAD &&
+	check_push_result $the_commit heads/master
+
+'
+
+test_expect_success 'push with HEAD nonexisting at remote' '
+
+	mk_test heads/master &&
+	git checkout -b local master &&
+	git push testrepo HEAD &&
+	check_push_result $the_commit heads/local
+'
+
 test_expect_success 'push with dry-run' '
 
 	mk_test heads/master &&