Only guess default branch when a repo page is requested

There's no need to invoke guess_defbranch() for each repo during
scan-path, since repo.defbranch is only used when repo content is
being displayed.

Also, some users prefer to register their projects manually in cgitrc
but they got no benefit from the new repo.defbranch handling.

This patch tries to rectify these issues by only invoking guess_defbranch()
when needed, regardless of how the repo was registered.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cgit.c

@@ -416,6 +416,37 @@ char *find_default_branch(struct cgit_repo *repo)
 	return ref;
 }
 
+static char *guess_defbranch(const char *repo_path)
+{
+	int fd, len;
+	char buffer[256];
+	char *ref_start;
+	char *head;
+
+	head = fmt("%s/HEAD", repo_path);
+	fd = open(head, O_RDONLY);
+	if (fd == -1)
+		return xstrdup("master");
+
+	memset(buffer, 0, sizeof(buffer));
+	len = read_in_full(fd, buffer, sizeof(buffer) - 1);
+	close(fd);
+
+	if(!memcmp(buffer, "ref: refs/heads/", 16))
+		return xstrndup(buffer + 16, len - 17);
+
+	if(strlen(buffer) == 41) {
+		/* probably contains a SHA1 sum */
+		memset(buffer, 0, sizeof(buffer));
+		if(readlink(head, buffer, sizeof(buffer)-1)) {
+			ref_start = memmem(buffer, sizeof(buffer)-1, "refs/heads/", 11);
+			if(ref_start)
+				return xstrdup(ref_start+11);
+		}
+	}
+	return xstrdup("master");
+}
+
 static int prepare_repo_cmd(struct cgit_context *ctx)
 {
 	char *tmp;
@@ -442,10 +473,12 @@ static int prepare_repo_cmd(struct cgit_context *ctx)
 	}
 	ctx->page.title = fmt("%s - %s", ctx->repo->name, ctx->repo->desc);
 
+	if (!ctx->repo->defbranch)
+		ctx->repo->defbranch = guess_defbranch(ctx->repo->path);
+
 	if (!ctx->qry.head) {
 		ctx->qry.nohead = 1;
 		ctx->qry.head = find_default_branch(ctx->repo);
-		ctx->repo->defbranch = ctx->qry.head;
 	}
 
 	if (!ctx->qry.head) {

scan-tree.c

@@ -68,39 +68,6 @@ static char *xstrrchr(char *s, char *from, int c)
 	return from < s ? NULL : from;
 }
 
-static char *guess_defbranch(const char *repo_path)
-{
-	int fd, len;
-	char buffer[256];
-	char *ref_start;
-	char *head;
-
-	head = fmt("%s/HEAD", repo_path);
-	fd = open(head, O_RDONLY);
-	if (fd == -1)
-		return xstrdup("master");
-
-	memset(buffer, 0, sizeof(buffer));
-	len = read_in_full(fd, buffer, sizeof(buffer)-1);
-	close(fd);
-
-	if(!memcmp(buffer, "ref: refs/heads/", 16))
-		return xstrndup(buffer+16, len-17);
-
-	if(strlen(buffer) == 41) {
-		/* probably contains a SHA1 sum */
-		memset(buffer, 0, sizeof(buffer));
-		if(readlink(head, buffer, sizeof(buffer)-1)) {
-			ref_start = memmem(buffer, sizeof(buffer)-1, "refs/heads/", 11);
-			if(ref_start)
-				return xstrdup(ref_start+11);
-		}
-	}
-
-	return xstrdup("master");
-}
-
-
 static void add_repo(const char *base, const char *path, repo_config_fn fn)
 {
 	struct stat st;
@@ -138,9 +105,6 @@ static void add_repo(const char *base, const char *path, repo_config_fn fn)
 			*p = '\0';
 	repo->name = repo->url;
 	repo->path = xstrdup(path);
-
-	repo->defbranch = guess_defbranch(repo->path);
-
 	while (!owner) {
 		if ((pwd = getpwuid(st.st_uid)) == NULL) {
 			fprintf(stderr, "Error reading owner-info for %s: %s (%d)\n",

shared.c

@@ -56,7 +56,6 @@ struct cgit_repo *cgit_add_repo(const char *url)
 	ret->desc = "[no description]";
 	ret->owner = NULL;
 	ret->section = ctx.cfg.section;
-	ret->defbranch = "master";
 	ret->snapshots = ctx.cfg.snapshots;
 	ret->enable_commit_graph = ctx.cfg.enable_commit_graph;
 	ret->enable_log_filecount = ctx.cfg.enable_log_filecount;