remote: support downloading all tags

Also honor remote.$name.tagopt = --tags.

include/git2/remote.h

@@ -307,7 +307,8 @@ GIT_EXTERN(void) git_remote_set_callbacks(git_remote *remote, git_remote_callbac
 enum {
 	GIT_REMOTE_DOWNLOAD_TAGS_UNSET,
 	GIT_REMOTE_DOWNLOAD_TAGS_NONE,
-	GIT_REMOTE_DOWNLOAD_TAGS_AUTO
+	GIT_REMOTE_DOWNLOAD_TAGS_AUTO,
+	GIT_REMOTE_DOWNLOAD_TAGS_ALL
 };
 
 /**

src/fetch.c

@@ -21,7 +21,7 @@
 
 struct filter_payload {
 	git_remote *remote;
-	const git_refspec *spec;
+	const git_refspec *spec, *tagspec;
 	git_odb *odb;
 	int found_head;
 };
@@ -29,18 +29,21 @@ struct filter_payload {
 static int filter_ref__cb(git_remote_head *head, void *payload)
 {
 	struct filter_payload *p = payload;
+	int match = 0;
 
-	if (!p->found_head && strcmp(head->name, GIT_HEAD_FILE) == 0) {
+	if (!git_reference_is_valid_name(head->name))
+		return 0;
+
+	if (!p->found_head && strcmp(head->name, GIT_HEAD_FILE) == 0)
 		p->found_head = 1;
-	} else {
-		/* If it doesn't match the refpec, we don't want it */
-		if (!git_refspec_src_matches(p->spec, head->name))
-			return 0;
+	else if (git_refspec_src_matches(p->spec, head->name))
+			match = 1;
+	else if (p->remote->download_tags == GIT_REMOTE_DOWNLOAD_TAGS_ALL &&
+		 git_refspec_src_matches(p->tagspec, head->name))
+			match = 1;
 
-		/* Don't even try to ask for the annotation target */
-		if (!git__suffixcmp(head->name, "^{}"))
-			return 0;
-	}
+	if (!match)
+		return 0;
 
 	/* If we have the object, mark it so we don't ask for it */
 	if (git_odb_exists(p->odb, &head->oid))
@@ -54,8 +57,11 @@ static int filter_ref__cb(git_remote_head *head, void *payload)
 static int filter_wants(git_remote *remote)
 {
 	struct filter_payload p;
+	git_refspec tagspec;
 
 	git_vector_clear(&remote->refs);
+	if (git_refspec__parse(&tagspec, GIT_REFSPEC_TAGS, true) < 0)
+		return -1;
 
 	/*
 	 * The fetch refspec can be NULL, and what this means is that the
@@ -64,6 +70,7 @@ static int filter_wants(git_remote *remote)
 	 * HEAD, which will be stored in FETCH_HEAD after the fetch.
 	 */
 	p.spec = git_remote_fetchspec(remote);
+	p.tagspec = &tagspec;
 	p.found_head = 0;
 	p.remote = remote;
 

src/refspec.h

@@ -19,6 +19,8 @@ struct git_refspec {
 		matching :1;
 };
 
+#define GIT_REFSPEC_TAGS "refs/tags/*:refs/tags/*"
+
 int git_refspec_parse(struct git_refspec *refspec, const char *str);
 int git_refspec__parse(
 	struct git_refspec *refspec,

src/remote.c

@@ -47,6 +47,8 @@ static int download_tags_value(git_remote *remote, git_config *cfg)
 	git_buf_free(&buf);
 	if (!error && !strcmp(val, "--no-tags"))
 		remote->download_tags = GIT_REMOTE_DOWNLOAD_TAGS_NONE;
+	else if (!error && !strcmp(val, "--tags"))
+		remote->download_tags = GIT_REMOTE_DOWNLOAD_TAGS_ALL;
 
 	if (error == GIT_ENOTFOUND)
 		error = 0;
@@ -455,7 +457,6 @@ int git_remote_update_tips(git_remote *remote)
 	git_remote_head *head;
 	git_reference *ref;
 	struct git_refspec *spec;
-	char *tagstr = "refs/tags/*:refs/tags/*";
 	git_refspec tagspec;
 
 	assert(remote);
@@ -469,7 +470,7 @@ int git_remote_update_tips(git_remote *remote)
 	if (git_repository_odb(&odb, remote->repo) < 0)
 		return -1;
 
-	if (git_refspec__parse(&tagspec, tagstr, true) < 0)
+	if (git_refspec__parse(&tagspec, GIT_REFSPEC_TAGS, true) < 0)
 		return -1;
 
 	/* HEAD is only allowed to be the first in the list */
@@ -500,7 +501,9 @@ int git_remote_update_tips(git_remote *remote)
 			if (git_refspec_transform_r(&refname, spec, head->name) < 0)
 				goto on_error;
 		} else if (remote->download_tags != GIT_REMOTE_DOWNLOAD_TAGS_NONE) {
-			autotag = 1;
+
+			if (remote->download_tags != GIT_REMOTE_DOWNLOAD_TAGS_ALL)
+				autotag = 1;
 
 			if (!git_refspec_src_matches(&tagspec, head->name))
 				continue;

src/remote.h

@@ -24,7 +24,7 @@ struct git_remote {
 	git_repository *repo;
 	git_remote_callbacks callbacks;
 	unsigned int need_pack:1,
-		download_tags:2, /* There are three possible values */
+		download_tags:2, /* There are four possible values */
 		check_cert:1;
 };