/* 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"
static int cgit_prepare_cache(struct cacheitem *item)
{
if (!cgit_repo && cgit_query_repo) {
char *title = fmt("%s - %s", cgit_root_title, "Bad request");
cgit_print_docstart(title, item);
cgit_print_pageheader(title, 0);
cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));
cgit_print_docend();
return 0;
}
if (!cgit_repo) {
item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
item->ttl = cgit_cache_root_ttl;
return 1;
}
if (!cgit_cmd) {
item->name = xstrdup(fmt("%s/%s/index.%s.html", cgit_cache_root,
cache_safe_filename(cgit_repo->url),
cache_safe_filename(cgit_querystring)));
item->ttl = cgit_cache_repo_ttl;
} else {
item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,
cache_safe_filename(cgit_repo->url),
cgit_query_page,
cache_safe_filename(cgit_querystring)));
if (cgit_query_has_symref)
item->ttl = cgit_cache_dynamic_ttl;
else if (cgit_query_has_sha1)
item->ttl = cgit_cache_static_ttl;
else
item->ttl = cgit_cache_repo_ttl;
}
return 1;
}
static void cgit_print_repo_page(struct cacheitem *item)
{
char *title;
int show_search;
if (!cgit_query_head)
cgit_query_head = cgit_repo->defbranch;
if (chdir(cgit_repo->path)) {
title = fmt("%s - %s", cgit_root_title, "Bad request");
cgit_print_docstart(title, item);
cgit_print_pageheader(title, 0);
cgit_print_error(fmt("Unable to scan repository: %s",
strerror(errno)));
cgit_print_docend();
return;
}
title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
show_search = 0;
setenv("GIT_DIR", cgit_repo->path, 1);
if ((cgit_cmd == CMD_SNAPSHOT) && cgit_repo->snapshots) {
cgit_print_snapshot(item, cgit_query_head, cgit_query_sha1,
cgit_repobasename(cgit_repo->url),
cgit_query_path,
cgit_repo->snapshots );
return;
}
if (cgit_cmd == CMD_BLOB) {
cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
return;
}
show_search = (cgit_cmd == CMD_LOG);
cgit_print_docstart(title, item);
if (!cgit_cmd) {
cgit_print_pageheader("summary", show_search);
cgit_print_summary();
cgit_print_docend();
return;
}
cgit_print_pageheader(cgit_query_page, show_search);
switch(cgit_cmd) {
case CMD_LOG:
cgit_print_log(cgit_query_sha1, cgit_query_ofs,
cgit_max_commit_count, cgit_query_search,
cgit_query_path, 1);
break;
case CMD_TREE:
cgit_print_tree(cgit_query_sha1, cgit_query_path);
break;
case CMD_COMMIT:
cgit_print_commit(cgit_query_sha1);
break;
case CMD_TAG:
cgit_print_tag(cgit_query_sha1);
break;
case CMD_DIFF:
cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
break;
default:
cgit_print_error("Invalid request");
}
cgit_print_docend();
}
static void cgit_fill_cache(struct cacheitem *item, int use_cache)
{
static char buf[PATH_MAX];
int stdout2;
getcwd(buf, sizeof(buf));
item->st.st_mtime = time(NULL);
if (use_cache) {
stdout2 = chk_positive(dup(STDOUT_FILENO),
"Preserving STDOUT");
chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
}
if (cgit_repo)
cgit_print_repo_page(item);
else
cgit_print_repolist(item);
if (use_cache) {
chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
chk_positive(dup2(stdout2, STDOUT_FILENO),
"Restoring original STDOUT");
chk_zero(close(stdout2), "Closing temporary STDOUT");
}
chdir(buf);
}
static void cgit_check_cache(struct cacheitem *item)
{
int i = 0;
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, 1);
cache_unlock(item);
} else {
cache_cancel_lock(item);
}
} else if (cache_expired(item) && cache_lock(item)) {
if (cache_expired(item)) {
cgit_fill_cache(item, 1);
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], "--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;
const char *cgit_config_env = getenv("CGIT_CONFIG");
htmlfd = STDOUT_FILENO;
item.st.st_mtime = time(NULL);
cgit_repolist.length = 0;
cgit_repolist.count = 0;
cgit_repolist.repos = NULL;
cgit_read_config(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
cgit_global_config_cb);
cgit_repo = NULL;
if (getenv("SCRIPT_NAME"))
cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
if (getenv("QUERY_STRING"))
cgit_querystring = xstrdup(getenv("QUERY_STRING"));
cgit_parse_args(argc, argv);
cgit_parse_query(cgit_querystring, cgit_querystring_cb);
if (!cgit_prepare_cache(&item))
return 0;
if (cgit_nocache) {
cgit_fill_cache(&item, 0);
} else {
cgit_check_cache(&item);
cgit_print_cache(&item);
}
return 0;
}
