Add argument parsing + switch for uncached operation

This adds support for the following options to cgit:
  --root=<path>
  --cache=<path>
  --nocache
  --query=<querystring>
  --repo=<reponame>
  --page=<pagename>
  --head=<branchname>
  --sha1=<sha1>
  --ofs=<number>

On startup, /etc/cgitrc is parsed, followed by argument parsing and
finally querystring parsing.

If --nocache is specified (or set in /etc/gitrc), caching is disabled and
cgit instead generates pages to stdout.

The combined effect of these two changes makes testing/debugging a lot
less painfull.

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

1 files changed, 47 insertions, 3 deletions

diff --git a/cgit.c b/cgit.c
index 37cdb83..9dbc608 100644
--- a/cgit.c
+++ b/cgit.c
@@ -1,110 +1,154 @@
 /* cgit.c: cgi for the git scm
  *
  * Copyright (C) 2006 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */
 
 #include "cgit.h"
 
 const char cgit_version[] = CGIT_VERSION;
 
 static void cgit_print_repo_page(struct cacheitem *item)
 {
         if (chdir(fmt("%s/%s", cgit_root, cgit_query_repo)) || 
             cgit_read_config("info/cgit", cgit_repo_config_cb)) {
                 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
                 cgit_print_docstart(title, item);
                 cgit_print_pageheader(title);
                 cgit_print_error(fmt("Unable to scan repository: %s",
                                      strerror(errno)));
                 cgit_print_docend();
                 return;
         }
         setenv("GIT_DIR", fmt("%s/%s", cgit_root, cgit_query_repo), 1);
         char *title = fmt("%s - %s", cgit_repo_name, cgit_repo_desc);
         cgit_print_docstart(title, item);
         cgit_print_pageheader(title);
         if (!cgit_query_page) {
                 cgit_print_summary();
         } else if (!strcmp(cgit_query_page, "log")) {
                 cgit_print_log(cgit_query_head, cgit_query_ofs, 100);
         } else if (!strcmp(cgit_query_page, "tree")) {
                 cgit_print_tree(cgit_query_sha1);
         } else if (!strcmp(cgit_query_page, "commit")) {
                 cgit_print_commit(cgit_query_sha1);
         } else if (!strcmp(cgit_query_page, "view")) {
                 cgit_print_view(cgit_query_sha1);
         }
         cgit_print_docend();
 }
 
 static void cgit_fill_cache(struct cacheitem *item)
 {
         htmlfd = item->fd;
         item->st.st_mtime = time(NULL);
         if (cgit_query_repo)
                 cgit_print_repo_page(item);
         else
                 cgit_print_repolist(item);
 }
 
 static void cgit_check_cache(struct cacheitem *item)
 {
         int i = 0;
 
         cache_prepare(item);
  top:
         if (++i > cgit_max_lock_attempts) {
                 die("cgit_refresh_cache: unable to lock %s: %s",
                     item->name, strerror(errno));
         }
         if (!cache_exist(item)) {
                 if (!cache_lock(item)) {
                         sleep(1);
                         goto top;
                 }
                 if (!cache_exist(item)) {
                         cgit_fill_cache(item);
                         cache_unlock(item);
                 } else {
                         cache_cancel_lock(item);
                 }
         } else if (cache_expired(item) && cache_lock(item)) {
                 if (cache_expired(item)) {
                         cgit_fill_cache(item);
                         cache_unlock(item);
                 } else {
                         cache_cancel_lock(item);
                 }
         }
 }
 
 static void cgit_print_cache(struct cacheitem *item)
 {
         static char buf[4096];
         ssize_t i;
 
         int fd = open(item->name, O_RDONLY);
         if (fd<0)
                 die("Unable to open cached file %s", item->name);
 
         while((i=read(fd, buf, sizeof(buf))) > 0)
                 write(STDOUT_FILENO, buf, i);
 
         close(fd);
 }
 
+static void cgit_parse_args(int argc, const char **argv)
+{
+        int i;
+
+        for (i = 1; i < argc; i++) {
+                if (!strncmp(argv[i], "--root=", 7)) {
+                        cgit_root = xstrdup(argv[i]+7);
+                }
+                if (!strncmp(argv[i], "--cache=", 8)) {
+                        cgit_cache_root = xstrdup(argv[i]+8);
+                }
+                if (!strcmp(argv[i], "--nocache")) {
+                        cgit_nocache = 1;
+                }
+                if (!strncmp(argv[i], "--query=", 8)) {
+                        cgit_querystring = xstrdup(argv[i]+8);
+                }
+                if (!strncmp(argv[i], "--repo=", 7)) {
+                        cgit_query_repo = xstrdup(argv[i]+7);
+                }
+                if (!strncmp(argv[i], "--page=", 7)) {
+                        cgit_query_page = xstrdup(argv[i]+7);
+                }
+                if (!strncmp(argv[i], "--head=", 7)) {
+                        cgit_query_head = xstrdup(argv[i]+7);
+                        cgit_query_has_symref = 1;
+                }
+                if (!strncmp(argv[i], "--sha1=", 7)) {
+                        cgit_query_sha1 = xstrdup(argv[i]+7);
+                        cgit_query_has_sha1 = 1;
+                }
+                if (!strncmp(argv[i], "--ofs=", 6)) {
+                        cgit_query_ofs = atoi(argv[i]+6);
+                }
+        }
+}
+
 int main(int argc, const char **argv)
 {
         struct cacheitem item;
 
         cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
-        cgit_querystring = xstrdup(getenv("QUERY_STRING"));
+        if (getenv("QUERY_STRING"))
+                cgit_querystring = xstrdup(getenv("QUERY_STRING"));
+        cgit_parse_args(argc, argv);
         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 
-        cgit_check_cache(&item);
-        cgit_print_cache(&item);
+        if (cgit_nocache) {
+                item.fd = STDOUT_FILENO;
+                cgit_fill_cache(&item);
+        } else {
+                cgit_check_cache(&item);
+                cgit_print_cache(&item);
+        }
         return 0;
 }