Teach cgit how to use PATH_INFO

This commit makes cgit use the cgi variables SCRIPT_NAME and PATH_INFO
when virtual-root is unspecified in cgitrc and no url-parameter is
specified on the querystring. This has two nice effects:

* Virtual urls works out of the box, no more need for rewrite-rules in httpd.
* Virtual urls with special querystring characters are handled correctly.

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

2 files changed, 28 insertions, 0 deletions

diff --git a/cgit.c b/cgit.c
index 497337b..a47cad0 100644
--- a/cgit.c
+++ b/cgit.c
@@ -117,32 +117,33 @@ void config_cb(const char *name, const char *value)
 		if (*value == '/')
 			ctx.repo->readme = xstrdup(value);
 		else
 			ctx.repo->readme = xstrdup(fmt("%s/%s", ctx.repo->path, value));
 	} else if (!strcmp(name, "include"))
 		parse_configfile(value, config_cb);
 }
 
 static void querystring_cb(const char *name, const char *value)
 {
 	if (!strcmp(name,"r")) {
 		ctx.qry.repo = xstrdup(value);
 		ctx.repo = cgit_get_repoinfo(value);
 	} else if (!strcmp(name, "p")) {
 		ctx.qry.page = xstrdup(value);
 	} else if (!strcmp(name, "url")) {
+		ctx.qry.url = xstrdup(value);
 		cgit_parse_url(value);
 	} else if (!strcmp(name, "qt")) {
 		ctx.qry.grep = xstrdup(value);
 	} else if (!strcmp(name, "q")) {
 		ctx.qry.search = xstrdup(value);
 	} else if (!strcmp(name, "h")) {
 		ctx.qry.head = xstrdup(value);
 		ctx.qry.has_symref = 1;
 	} else if (!strcmp(name, "id")) {
 		ctx.qry.sha1 = xstrdup(value);
 		ctx.qry.has_sha1 = 1;
 	} else if (!strcmp(name, "id2")) {
 		ctx.qry.sha2 = xstrdup(value);
 		ctx.qry.has_sha1 = 1;
 	} else if (!strcmp(name, "ofs")) {
 		ctx.qry.ofs = atoi(value);
@@ -360,44 +361,70 @@ static int calc_ttl()
 
 	if (!ctx.qry.page)
 		return ctx.cfg.cache_repo_ttl;
 
 	if (ctx.qry.has_symref)
 		return ctx.cfg.cache_dynamic_ttl;
 
 	if (ctx.qry.has_sha1)
 		return ctx.cfg.cache_static_ttl;
 
 	return ctx.cfg.cache_repo_ttl;
 }
 
 int main(int argc, const char **argv)
 {
 	const char *cgit_config_env = getenv("CGIT_CONFIG");
+	const char *path;
+	char *qry;
 	int err, ttl;
 
 	prepare_context(&ctx);
 	cgit_repolist.length = 0;
 	cgit_repolist.count = 0;
 	cgit_repolist.repos = NULL;
 
 	parse_configfile(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
 			 config_cb);
 	ctx.repo = NULL;
 	if (getenv("SCRIPT_NAME"))
 		ctx.cfg.script_name = xstrdup(getenv("SCRIPT_NAME"));
 	if (getenv("QUERY_STRING"))
 		ctx.qry.raw = xstrdup(getenv("QUERY_STRING"));
 	cgit_parse_args(argc, argv);
 	http_parse_querystring(ctx.qry.raw, querystring_cb);
 
+	/* If virtual-root isn't specified in cgitrc and no url
+	 * parameter is specified on the querystring, lets pretend
+	 * that virtualroot equals SCRIPT_NAME and use PATH_INFO as
+	 * url. This allows cgit to work with virtual urls without
+	 * the need for rewriterules in the webserver (as long as
+	 * PATH_INFO is included in the cache lookup key).
+	 */
+	if (!ctx.cfg.virtual_root && !ctx.qry.url) {
+		ctx.cfg.virtual_root = ctx.cfg.script_name;
+		path = getenv("PATH_INFO");
+		if (path) {
+			if (path[0] == '/')
+				path++;
+			ctx.qry.url = xstrdup(path);
+			if (ctx.qry.raw) {
+				qry = ctx.qry.raw;
+				ctx.qry.raw = xstrdup(fmt("%s?%s", path, qry));
+				free(qry);
+			} else
+				ctx.qry.raw = ctx.qry.url;
+			cgit_parse_url(ctx.qry.url);
+		}
+	}
+
 	ttl = calc_ttl();
 	ctx.page.expires += ttl*60;
 	if (ctx.cfg.nocache)
 		ctx.cfg.cache_size = 0;
 	err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
 			    ctx.qry.raw, ttl, process_request, &ctx);
 	if (err)
 		cgit_print_error(fmt("Error processing page: %s (%d)",
 				     strerror(err), err));
 	return err;
 }
diff --git a/cgit.h b/cgit.h
index 08fd95a..d07185c 100644
--- a/cgit.h
+++ b/cgit.h
@@ -105,32 +105,33 @@ struct reflist {
 };
 
 struct cgit_query {
 	int has_symref;
 	int has_sha1;
 	char *raw;
 	char *repo;
 	char *page;
 	char *search;
 	char *grep;
 	char *head;
 	char *sha1;
 	char *sha2;
 	char *path;
 	char *name;
 	char *mimetype;
+	char *url;
 	int   ofs;
 };
 
 struct cgit_config {
 	char *agefile;
 	char *cache_root;
 	char *clone_prefix;
 	char *css;
 	char *favicon;
 	char *footer;
 	char *index_header;
 	char *index_info;
 	char *logo;
 	char *logo_link;
 	char *module_link;
 	char *repo_group;