Add `strict-export` option

This option is used to specify a filename which needs to be present in
the repositories found during `scan-path` processing. By setting this
option to 'git-daemon-export-ok', only repositories explicitly marked
for git daemon export will be included in the cgit configuration.

Signed-off-by: Felix Hanley <felix@seconddrawer.com.au>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cgit.c

@@ -121,6 +121,8 @@ void config_cb(const char *name, const char *value)
 		ctx.cfg.logo_link = xstrdup(value);
 	else if (!strcmp(name, "module-link"))
 		ctx.cfg.module_link = xstrdup(value);
+	else if (!strcmp(name, "strict-export"))
+		ctx.cfg.strict_export = xstrdup(value);
 	else if (!strcmp(name, "virtual-root")) {
 		ctx.cfg.virtual_root = trim_end(value, '/');
 		if (!ctx.cfg.virtual_root && (!strcmp(value, "/")))

cgit.h

@@ -176,6 +176,7 @@ struct cgit_config {
 	char *script_name;
 	char *section;
 	char *virtual_root;
+	char *strict_export;
 	int cache_size;
 	int cache_dynamic_ttl;
 	int cache_max_create_time;

cgitrc.5.txt

@@ -317,6 +317,13 @@ summary-tags::
 	Specifies the number of tags to display in the repository "summary"
 	view. Default value: "10".
 
+strict-export::
+	Filename which, if specified, needs to be present within the repository
+	for cgit to allow access to that repository. This can be used to emulate
+	gitweb's EXPORT_OK and STRICT_EXPORT functionality and limit cgit's
+	repositories to match those exported by git-daemon. This option MUST come
+	before 'scan-path'.
+
 virtual-root::
 	Url which, if specified, will be used as root for all cgit links. It
 	will also cause cgit to generate 'virtual urls', i.e. urls like

scan-tree.c

@@ -81,6 +81,10 @@ static void add_repo(const char *base, const char *path, repo_config_fn fn)
 			path, strerror(errno), errno);
 		return;
 	}
+
+	if (ctx.cfg.strict_export && stat(fmt("%s/%s", path, ctx.cfg.strict_export), &st))
+		return;
+
 	if (!stat(fmt("%s/noweb", path), &st))
 		return;