Untie logic for SCRIPT_NAME and PATH_INFO

SCRIPT_NAME is used as fallback for virtual-root when virtual-root is
unspecified in cgitrc and PATH_INFO is used as fallback for the query-
string parameter 'url' when the latter is unspecified. But until now,
the use of PATH_INFO depended on virtual-root also being unspecified,
i.e. it was impossible to use PATH_INFO when virtual-root was specified.

This commit makes the fallback on SCRIPT_NAME and PATH_INFO independent
code paths, i.e. it is now possible to specify virtual-root in cgitrc
while still using PATH_INFO (instead of rewrite rules) to get 'pretty
urls'.

Noticed-by: Jack Moffitt <jack@chesspark.com>
Noticed-by: LiKai Liu <liulk@cs.bu.edu>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 10 insertions, 9 deletions

diff --git a/cgit.c b/cgit.c
index 166fbc6..d1cee58 100644
--- a/cgit.c
+++ b/cgit.c
@@ -250,227 +250,228 @@ static int prepare_repo_cmd(struct cgit_context *ctx)
 		ctx->repo = NULL;
 		cgit_print_http_headers(ctx);
 		cgit_print_docstart(ctx);
 		cgit_print_pageheader(ctx);
 		cgit_print_error(tmp);
 		cgit_print_docend();
 		return 1;
 	}
 	ctx->page.title = fmt("%s - %s", ctx->repo->name, ctx->repo->desc);
 
 	if (!ctx->qry.head) {
 		ctx->qry.nohead = 1;
 		ctx->qry.head = find_default_branch(ctx->repo);
 		ctx->repo->defbranch = ctx->qry.head;
 	}
 
 	if (!ctx->qry.head) {
 		cgit_print_http_headers(ctx);
 		cgit_print_docstart(ctx);
 		cgit_print_pageheader(ctx);
 		cgit_print_error("Repository seems to be empty");
 		cgit_print_docend();
 		return 1;
 	}
 
 	if (get_sha1(ctx->qry.head, sha1)) {
 		tmp = xstrdup(ctx->qry.head);
 		ctx->qry.head = ctx->repo->defbranch;
 		cgit_print_http_headers(ctx);
 		cgit_print_docstart(ctx);
 		cgit_print_pageheader(ctx);
 		cgit_print_error(fmt("Invalid branch: %s", tmp));
 		cgit_print_docend();
 		return 1;
 	}
 	return 0;
 }
 
 static void process_request(void *cbdata)
 {
 	struct cgit_context *ctx = cbdata;
 	struct cgit_cmd *cmd;
 
 	cmd = cgit_get_cmd(ctx);
 	if (!cmd) {
 		ctx->page.title = "cgit error";
 		ctx->repo = NULL;
 		cgit_print_http_headers(ctx);
 		cgit_print_docstart(ctx);
 		cgit_print_pageheader(ctx);
 		cgit_print_error("Invalid request");
 		cgit_print_docend();
 		return;
 	}
 
 	if (cmd->want_repo && !ctx->repo) {
 		cgit_print_http_headers(ctx);
 		cgit_print_docstart(ctx);
 		cgit_print_pageheader(ctx);
 		cgit_print_error(fmt("No repository selected"));
 		cgit_print_docend();
 		return;
 	}
 
 	if (ctx->repo && prepare_repo_cmd(ctx))
 		return;
 
 	if (cmd->want_layout) {
 		cgit_print_http_headers(ctx);
 		cgit_print_docstart(ctx);
 		cgit_print_pageheader(ctx);
 	}
 
 	cmd->fn(ctx);
 
 	if (cmd->want_layout)
 		cgit_print_docend();
 }
 
 int cmp_repos(const void *a, const void *b)
 {
 	const struct cgit_repo *ra = a, *rb = b;
 	return strcmp(ra->url, rb->url);
 }
 
 void print_repo(struct cgit_repo *repo)
 {
 	printf("repo.url=%s\n", repo->url);
 	printf("repo.name=%s\n", repo->name);
 	printf("repo.path=%s\n", repo->path);
 	if (repo->owner)
 		printf("repo.owner=%s\n", repo->owner);
 	if (repo->desc)
 		printf("repo.desc=%s\n", repo->desc);
 	if (repo->readme)
 		printf("repo.readme=%s\n", repo->readme);
 	printf("\n");
 }
 
 void print_repolist(struct cgit_repolist *list)
 {
 	int i;
 
 	for(i = 0; i < list->count; i++)
 		print_repo(&list->repos[i]);
 }
 
 
 static void cgit_parse_args(int argc, const char **argv)
 {
 	int i;
 	int scan = 0;
 
 	for (i = 1; i < argc; i++) {
 		if (!strncmp(argv[i], "--cache=", 8)) {
 			ctx.cfg.cache_root = xstrdup(argv[i]+8);
 		}
 		if (!strcmp(argv[i], "--nocache")) {
 			ctx.cfg.nocache = 1;
 		}
 		if (!strncmp(argv[i], "--query=", 8)) {
 			ctx.qry.raw = xstrdup(argv[i]+8);
 		}
 		if (!strncmp(argv[i], "--repo=", 7)) {
 			ctx.qry.repo = xstrdup(argv[i]+7);
 		}
 		if (!strncmp(argv[i], "--page=", 7)) {
 			ctx.qry.page = xstrdup(argv[i]+7);
 		}
 		if (!strncmp(argv[i], "--head=", 7)) {
 			ctx.qry.head = xstrdup(argv[i]+7);
 			ctx.qry.has_symref = 1;
 		}
 		if (!strncmp(argv[i], "--sha1=", 7)) {
 			ctx.qry.sha1 = xstrdup(argv[i]+7);
 			ctx.qry.has_sha1 = 1;
 		}
 		if (!strncmp(argv[i], "--ofs=", 6)) {
 			ctx.qry.ofs = atoi(argv[i]+6);
 		}
 		if (!strncmp(argv[i], "--scan-tree=", 12)) {
 			scan++;
 			scan_tree(argv[i] + 12);
 		}
 	}
 	if (scan) {
 		qsort(cgit_repolist.repos, cgit_repolist.count,
 			sizeof(struct cgit_repo), cmp_repos);
 		print_repolist(&cgit_repolist);
 		exit(0);
 	}
 }
 
 static int calc_ttl()
 {
 	if (!ctx.repo)
 		return ctx.cfg.cache_root_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;
 
 	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);
 	parse_configfile(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
 			 config_cb);
 	ctx.repo = NULL;
 	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 virtual-root isn't specified in cgitrc, lets pretend
+	 * that virtual-root equals SCRIPT_NAME.
 	 */
-	if (!ctx.cfg.virtual_root && !ctx.qry.url) {
+	if (!ctx.cfg.virtual_root)
 		ctx.cfg.virtual_root = ctx.cfg.script_name;
+
+	/* If no url parameter is specified on the querystring, lets
+	 * 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).
+	 */
 		path = getenv("PATH_INFO");
-		if (path) {
+	if (!ctx.qry.url && 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;
 }