Support Git over HTTP using git-http-backendworking

This saves users from the hassle of setting up git-http-backend when
they already run cgit.

References: man git-http-backend

Signed-off-by: Florian Pritz <bluewind@xinu.at>

1 files changed, 61 insertions, 0 deletions

diff --git a/ui-clone.c b/ui-clone.c
index a4ffd6e..91d8306 100644
--- a/ui-clone.c
+++ b/ui-clone.c
@@ -69,8 +69,43 @@ static void send_file(char *path)
 	html_include(path);
 }
 
+static void dispatch_to_git_http_backend(void)
+{
+	if (access(ctx.cfg.http_backend_path, X_OK) != -1) {
+		size_t git_root_len;
+		char *git_root = NULL;
+
+		/* git-http-backend does it's own URL parsing and concatenates
+		 * GIT_PROJECT_ROOT and PATH_INFO to find the git repo.
+		 * The root is the same as scan-path, but scan-path is not
+		 * always available so we calculate the root path.
+		 * Example:
+		 *   repo.path   = /srv/git/some/more/dirs/
+		 *   qry.repo    = some/more/dirs
+		 *   -> git_root = /srv/git/
+		 */
+		strip_suffix(ctx.repo->path, "/", &git_root_len);
+		strip_suffix_mem(ctx.repo->path, &git_root_len, ctx.qry.repo);
+
+		git_root = xmalloc(git_root_len + 1);
+		strncpy(git_root, ctx.repo->path, git_root_len);
+		git_root[git_root_len] = '\0';
+
+		setenv("GIT_PROJECT_ROOT", git_root, 1);
+		execl(ctx.cfg.http_backend_path, "git-http-backend", NULL);
+	} else {
+		fprintf(stderr, "[cgit] http-backend-path (%s) is not executable: %s\n",
+			ctx.cfg.http_backend_path, strerror(errno));
+		html_status(500, "Internal Server Error", 0);
+	}
+}
+
 void cgit_clone_info(void)
 {
+	if (ctx.cfg.http_backend_path) {
+		return dispatch_to_git_http_backend();
+	}
+
 	if (!ctx.qry.path || strcmp(ctx.qry.path, "refs"))
 		return;
 
@@ -82,6 +117,10 @@ void cgit_clone_info(void)
 
 void cgit_clone_objects(void)
 {
+	if (ctx.cfg.http_backend_path) {
+		return dispatch_to_git_http_backend();
+	}
+
 	if (!ctx.qry.path) {
 		html_status(400, "Bad request", 0);
 		return;
@@ -97,5 +136,27 @@ void cgit_clone_objects(void)
 
 void cgit_clone_head(void)
 {
+	if (ctx.cfg.http_backend_path) {
+		return dispatch_to_git_http_backend();
+	}
+
 	send_file(git_path("%s", "HEAD"));
 }
+
+void cgit_clone_git_upload_pack(void)
+{
+	if (ctx.cfg.http_backend_path) {
+		return dispatch_to_git_http_backend();
+	}
+
+	html_status(404, "Not found", 0);
+}
+
+void cgit_clone_git_receive_pack(void)
+{
+	if (ctx.cfg.http_backend_path) {
+		return dispatch_to_git_http_backend();
+	}
+
+	html_status(404, "Not found", 0);
+}