Add 'Support Git over HTTP by proxying git-http-backend(1)' patch.el6

1 files changed, 223 insertions, 0 deletions

diff --git a/support-Git-over-HTTP-by-proxying_git-http-backend.patch b/support-Git-over-HTTP-by-proxying_git-http-backend.patch
new file mode 100644
index 0000000..d07ea7e
--- /dev/null
+++ b/support-Git-over-HTTP-by-proxying_git-http-backend.patch
@@ -0,0 +1,223 @@
+From 2d8f83a3072970a51c45d2f72724696781ef6de8 Mon Sep 17 00:00:00 2001
+From: Wolfgang Müller
+Date: Fri, 28 May 2021 16:03:01 +0200
+Subject: Support Git over HTTP by proxying git-http-backend(1)
+
+cgit lacks an easy way to support the "smart" HTTP protocol out of the
+box. A patch [1] has been proposed in the past, but was never merged.
+A few years later there was a short discussion at [2] which did not go
+anywhere.
+
+The majority of users who want to support the "smart" HTTP protocol
+right now seem to conditionally point their web server to
+git-http-backend(1) directly. This relies on proper path-matching and
+regular expression support in the web server as seen in the EXMAPLES
+section of git-http-backend(1).
+
+As proposed in [3], it is possible to have cgit interface with the
+necessary functionality in Git directly, but that would require more
+work. It does not seem that this is something forthcoming in cgit.
+
+Instead, for now, use a modified version of the patch suggested in [1],
+which simply executes git-http-backend(1) when needed. This removes the
+need for any additional plumbing in the web server.
+
+Notable changes to the original patch:
+
+ * Remove automatic handling of GIT_PROJECT_ROOT in favour of having the
+   user set the variable correctly themselves. This reduces complexity.
+
+ * Use the correct function to generate error pages. The original patch
+   used html_status(), which does not exist anymore.
+
+ * In cmd.c, adjust the struct entries to fit. Sadly we cannot use the
+   def_cmd() macro directly, as the endpoints "git-upload-pack" and
+   "git-receive-pack" contain dashes.
+
+[1] https://lists.zx2c4.com/pipermail/cgit/2014-December/002312.html
+[2] https://lists.zx2c4.com/pipermail/cgit/2016-February/002907.html
+[3] https://lists.zx2c4.com/pipermail/cgit/2016-February/002926.html
+---
+ cgit.c       |  3 +++
+ cgit.h       |  1 +
+ cgitrc.5.txt |  8 ++++++++
+ cmd.c        | 13 +++++++++++++
+ ui-clone.c   | 44 ++++++++++++++++++++++++++++++++++++++++++++
+ ui-clone.h   |  2 ++
+ 6 files changed, 71 insertions(+)
+
+diff --git a/cgit.c b/cgit.c
+index c4320f0..fc85c18 100644
+--- a/cgit.c
++++ b/cgit.c
+@@ -151,6 +151,8 @@ static void config_cb(const char *name, const char *value)
+ 		ctx.cfg.head_include = xstrdup(value);
+ 	else if (!strcmp(name, "header"))
+ 		ctx.cfg.header = xstrdup(value);
++	else if (!strcmp(name, "http-backend-path"))
++		ctx.cfg.http_backend_path = xstrdup(value);
+ 	else if (!strcmp(name, "logo"))
+ 		ctx.cfg.logo = xstrdup(value);
+ 	else if (!strcmp(name, "logo-link"))
+@@ -379,6 +381,7 @@ static void prepare_context(void)
+ 	ctx.cfg.css = "/cgit.css";
+ 	ctx.cfg.logo = "/cgit.png";
+ 	ctx.cfg.favicon = "/favicon.ico";
++	ctx.cfg.http_backend_path = NULL;
+ 	ctx.cfg.local_time = 0;
+ 	ctx.cfg.enable_http_clone = 1;
+ 	ctx.cfg.enable_index_owner = 1;
+diff --git a/cgit.h b/cgit.h
+index 7ec46b4..cd29892 100644
+--- a/cgit.h
++++ b/cgit.h
+@@ -200,6 +200,7 @@ struct cgit_config {
+ 	char *footer;
+ 	char *head_include;
+ 	char *header;
++	char *http_backend_path;
+ 	char *logo;
+ 	char *logo_link;
+ 	char *mimetype_file;
+diff --git a/cgitrc.5.txt b/cgitrc.5.txt
+index 33a6a8c..820cfa6 100644
+--- a/cgitrc.5.txt
++++ b/cgitrc.5.txt
+@@ -234,6 +234,11 @@ header::
+ 	The content of the file specified with this option will be included
+ 	verbatim at the top of all pages. Default value: none.
+ 
++http-backend-path::
++	Path to the git-http-backend binary. Setting this allows the git clone to
++	fetch/push via Git over HTTP. You'll also need to set enable-http-clone
++	for this to work. See git-http-backend(1). Default value: none.
++
+ include::
+ 	Name of a configfile to include before the rest of the current config-
+ 	file is parsed. Default value: none. See also: "MACRO EXPANSION".
+@@ -824,6 +829,9 @@ enable-index-owner=1
+ # Allow http transport git clone
+ enable-http-clone=1
+ 
++# Use git-http-backend to serve Git over HTTP
++http-backend-path=/usr/lib/git-core/git-http-backend
++
+ 
+ # Show extra links for each repository on the index page
+ enable-index-links=1
+diff --git a/cmd.c b/cmd.c
+index bf6d8f5..7f1ca98 100644
+--- a/cmd.c
++++ b/cmd.c
+@@ -164,6 +164,17 @@ static void tree_fn(void)
+ 	cgit_print_tree(ctx.qry.sha1, ctx.qry.path);
+ }
+ 
++static void git_upload_pack_fn(void)
++{
++	cgit_clone_git_upload_pack();
++}
++
++static void git_receive_pack_fn(void)
++{
++	cgit_clone_git_receive_pack();
++}
++
++
+ #define def_cmd(name, want_repo, want_vpath, is_clone) \
+ 	{#name, name##_fn, want_repo, want_vpath, is_clone}
+ 
+@@ -191,6 +202,8 @@ struct cgit_cmd *cgit_get_cmd(void)
+ 		def_cmd(summary, 1, 0, 0),
+ 		def_cmd(tag, 1, 0, 0),
+ 		def_cmd(tree, 1, 1, 0),
++		{"git-upload-pack", git_upload_pack_fn, 1, 0, 1},
++		{"git-receive-pack", git_receive_pack_fn, 1, 0, 1},
+ 	};
+ 	int i;
+ 
+diff --git a/ui-clone.c b/ui-clone.c
+index 5dccb63..3a9cfeb 100644
+--- a/ui-clone.c
++++ b/ui-clone.c
+@@ -77,8 +77,22 @@ static void send_file(const char *path)
+ 	html_include(path);
+ }
+ 
++static void dispatch_to_git_http_backend(void)
++{
++	if (execl(ctx.cfg.http_backend_path, "git-http-backend", NULL) == -1) {
++		fprintf(stderr, "[cgit] http-backend-path (%s) could not be spawned: %s\n",
++				ctx.cfg.http_backend_path, strerror(errno));
++		cgit_print_error_page(500, "Internal Server Error", "Internal Server Error");
++	}
++}
++
+ void cgit_clone_info(void)
+ {
++	if (ctx.cfg.http_backend_path) {
++		dispatch_to_git_http_backend();
++		return;
++	}
++
+ 	if (!ctx.qry.path || strcmp(ctx.qry.path, "refs")) {
+ 		cgit_print_error_page(400, "Bad request", "Bad request");
+ 		return;
+@@ -94,6 +108,11 @@ void cgit_clone_objects(void)
+ {
+ 	char *p;
+ 
++	if (ctx.cfg.http_backend_path) {
++		dispatch_to_git_http_backend();
++		return;
++	}
++
+ 	if (!ctx.qry.path)
+ 		goto err;
+ 
+@@ -122,5 +141,30 @@ err:
+ 
+ void cgit_clone_head(void)
+ {
++	if (ctx.cfg.http_backend_path) {
++		dispatch_to_git_http_backend();
++		return;
++	}
++
+ 	send_file(git_path("%s", "HEAD"));
+ }
++
++void cgit_clone_git_upload_pack(void)
++{
++	if (ctx.cfg.http_backend_path) {
++		dispatch_to_git_http_backend();
++		return;
++	}
++
++	cgit_print_error_page(404, "Not found", "Not found");
++}
++
++void cgit_clone_git_receive_pack(void)
++{
++	if (ctx.cfg.http_backend_path) {
++		dispatch_to_git_http_backend();
++		return;
++	}
++
++	cgit_print_error_page(404, "Not found", "Not found");
++}
+diff --git a/ui-clone.h b/ui-clone.h
+index 3e460a3..b27087e 100644
+--- a/ui-clone.h
++++ b/ui-clone.h
+@@ -4,5 +4,7 @@
+ void cgit_clone_info(void);
+ void cgit_clone_objects(void);
+ void cgit_clone_head(void);
++void cgit_clone_git_upload_pack(void);
++void cgit_clone_git_receive_pack(void);
+ 
+ #endif /* UI_CLONE_H */
+-- 
+cgit v1.2.3-2-gb3c3
+