Add support for cloning over http

This patch implements basic support for cloning over http, based on the
work on git-http-backend by Shawn O. Pearce.

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

1 files changed, 104 insertions, 0 deletions

diff --git a/ui-clone.c b/ui-clone.c
new file mode 100644
index 0000000..3a037ad
--- /dev/null
+++ b/ui-clone.c
@@ -0,0 +1,104 @@
+/* ui-clone.c: functions for http cloning, based on
+ * git's http-backend.c by Shawn O. Pearce
+ *
+ * Copyright (C) 2008 Lars Hjemli
+ *
+ * Licensed under GNU General Public License v2
+ *   (see COPYING for full license text)
+ */
+
+#include "cgit.h"
+#include "html.h"
+#include "ui-shared.h"
+
+static int print_ref_info(const char *refname, const unsigned char *sha1,
+                          int flags, void *cb_data)
+{
+	struct object *obj;
+
+	if (!(obj = parse_object(sha1)))
+		return 0;
+
+	if (!strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"))
+		htmlf("%s\t%s\n", sha1_to_hex(sha1), refname);
+	else if (!prefixcmp(refname, "refs/tags") && obj->type == OBJ_TAG) {
+		if (!(obj = deref_tag(obj, refname, 0)))
+			return 0;
+		htmlf("%s\t%s\n", sha1_to_hex(sha1), refname);
+		htmlf("%s\t%s^{}\n", sha1_to_hex(obj->sha1), refname);
+	}
+	return 0;
+}
+
+static void print_pack_info(struct cgit_context *ctx)
+{
+	struct packed_git *pack;
+	int ofs;
+
+	ctx->page.mimetype = "text/plain";
+	ctx->page.filename = "objects/info/packs";
+	cgit_print_http_headers(ctx);
+	ofs = strlen(ctx->repo->path) + strlen("/objects/pack/");
+	prepare_packed_git();
+	for (pack = packed_git; pack; pack = pack->next)
+		if (pack->pack_local)
+			htmlf("P %s\n", pack->pack_name + ofs);
+}
+
+static void send_file(struct cgit_context *ctx, char *path)
+{
+	struct stat st;
+	int err;
+
+	if (stat(path, &st)) {
+		switch (errno) {
+		case ENOENT:
+			err = 404;
+			break;
+		case EACCES:
+			err = 403;
+			break;
+		default:
+			err = 400;
+		}
+		html_status(err, 0);
+		return;
+	}
+	ctx->page.mimetype = "application/octet-stream";
+	ctx->page.filename = path;
+	if (prefixcmp(ctx->repo->path, path))
+		ctx->page.filename += strlen(ctx->repo->path) + 1;
+	cgit_print_http_headers(ctx);
+	html_include(path);
+}
+
+void cgit_clone_info(struct cgit_context *ctx)
+{
+	if (!ctx->qry.path || strcmp(ctx->qry.path, "refs"))
+		return;
+
+	ctx->page.mimetype = "text/plain";
+	ctx->page.filename = "info/refs";
+	cgit_print_http_headers(ctx);
+	for_each_ref(print_ref_info, ctx);
+}
+
+void cgit_clone_objects(struct cgit_context *ctx)
+{
+	if (!ctx->qry.path) {
+		html_status(400, 0);
+		return;
+	}
+
+	if (!strcmp(ctx->qry.path, "info/packs")) {
+		print_pack_info(ctx);
+		return;
+	}
+
+	send_file(ctx, git_path("objects/%s", ctx->qry.path));
+}
+
+void cgit_clone_head(struct cgit_context *ctx)
+{
+	send_file(ctx, git_path("%s", "HEAD"));
+}