Improve initialization of git directory

Using the functions offered by libgit feels like the right thing to do. Also,
make sure that config errors gets properly reported.

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

2 files changed, 9 insertions, 10 deletions

diff --git a/cgit.c b/cgit.c
index b270fdc..2c933dc 100644
--- a/cgit.c
+++ b/cgit.c
@@ -1,318 +1,317 @@
 /* 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 (!ctx.repo && ctx.qry.repo) {
 		char *title = fmt("%s - %s", ctx.cfg.root_title, "Bad request");
 		cgit_print_docstart(title, item);
 		cgit_print_pageheader(title, 0);
 		cgit_print_error(fmt("Unknown repo: %s", ctx.qry.repo));
 		cgit_print_docend();
 		return 0;
 	}
 
 	if (!ctx.repo) {
 		item->name = xstrdup(fmt("%s/index.html", ctx.cfg.cache_root));
 		item->ttl = ctx.cfg.cache_root_ttl;
 		return 1;
 	}
 
 	if (!cgit_cmd) {
 		item->name = xstrdup(fmt("%s/%s/index.%s.html", ctx.cfg.cache_root,
 					 cache_safe_filename(ctx.repo->url),
 					 cache_safe_filename(ctx.qry.raw)));
 		item->ttl = ctx.cfg.cache_repo_ttl;
 	} else {
 		item->name = xstrdup(fmt("%s/%s/%s/%s.html", ctx.cfg.cache_root,
 					 cache_safe_filename(ctx.repo->url),
 					 ctx.qry.page,
 					 cache_safe_filename(ctx.qry.raw)));
 		if (ctx.qry.has_symref)
 			item->ttl = ctx.cfg.cache_dynamic_ttl;
 		else if (ctx.qry.has_sha1)
 			item->ttl = ctx.cfg.cache_static_ttl;
 		else
 			item->ttl = ctx.cfg.cache_repo_ttl;
 	}
 	return 1;
 }
 
 struct refmatch {
 	char *req_ref;
 	char *first_ref;
 	int match;
 };
 
 int find_current_ref(const char *refname, const unsigned char *sha1,
 		     int flags, void *cb_data)
 {
 	struct refmatch *info;
 
 	info = (struct refmatch *)cb_data;
 	if (!strcmp(refname, info->req_ref))
 		info->match = 1;
 	if (!info->first_ref)
 		info->first_ref = xstrdup(refname);
 	return info->match;
 }
 
 char *find_default_branch(struct cgit_repo *repo)
 {
 	struct refmatch info;
 
 	info.req_ref = repo->defbranch;
 	info.first_ref = NULL;
 	info.match = 0;
 	for_each_branch_ref(find_current_ref, &info);
 	if (info.match)
 		return info.req_ref;
 	else
 		return info.first_ref;
 }
 
 static void cgit_print_repo_page(struct cacheitem *item)
 {
 	char *title, *tmp;
 	int show_search;
 	unsigned char sha1[20];
+	int nongit = 0;
 
-	if (chdir(ctx.repo->path)) {
-		title = fmt("%s - %s", ctx.cfg.root_title, "Bad request");
+	setenv("GIT_DIR", ctx.repo->path, 1);
+	setup_git_directory_gently(&nongit);
+	if (nongit) {
+		title = fmt("%s - %s", ctx.cfg.root_title, "config error");
+		tmp = fmt("Not a git repository: '%s'", ctx.repo->path);
+		ctx.repo = NULL;
 		cgit_print_docstart(title, item);
 		cgit_print_pageheader(title, 0);
-		cgit_print_error(fmt("Unable to scan repository: %s",
-				     strerror(errno)));
+		cgit_print_error(tmp);
 		cgit_print_docend();
 		return;
 	}
 
 	title = fmt("%s - %s", ctx.repo->name, ctx.repo->desc);
 	show_search = 0;
-	setenv("GIT_DIR", ctx.repo->path, 1);
 
 	if (!ctx.qry.head) {
 		ctx.qry.head = xstrdup(find_default_branch(ctx.repo));
 		ctx.repo->defbranch = ctx.qry.head;
 	}
 
 	if (!ctx.qry.head) {
 		cgit_print_docstart(title, item);
 		cgit_print_pageheader(title, 0);
 		cgit_print_error("Repository seems to be empty");
 		cgit_print_docend();
 		return;
 	}
 
 	if (get_sha1(ctx.qry.head, sha1)) {
 		tmp = xstrdup(ctx.qry.head);
 		ctx.qry.head = ctx.repo->defbranch;
 		cgit_print_docstart(title, item);
 		cgit_print_pageheader(title, 0);
 		cgit_print_error(fmt("Invalid branch: %s", tmp));
 		cgit_print_docend();
 		return;
 	}
 
 	if ((cgit_cmd == CMD_SNAPSHOT) && ctx.repo->snapshots) {
 		cgit_print_snapshot(item, ctx.qry.head, ctx.qry.sha1,
 				    cgit_repobasename(ctx.repo->url),
 				    ctx.qry.path,
 				    ctx.repo->snapshots );
 		return;
 	}
 
 	if (cgit_cmd == CMD_PATCH) {
 		cgit_print_patch(ctx.qry.sha1, item);
 		return;
 	}
 
 	if (cgit_cmd == CMD_BLOB) {
 		cgit_print_blob(item, ctx.qry.sha1, ctx.qry.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(ctx.qry.page, show_search);
 
 	switch(cgit_cmd) {
 	case CMD_LOG:
 		cgit_print_log(ctx.qry.sha1, ctx.qry.ofs,
 			       ctx.cfg.max_commit_count, ctx.qry.grep, ctx.qry.search,
 			       ctx.qry.path, 1);
 		break;
 	case CMD_TREE:
 		cgit_print_tree(ctx.qry.sha1, ctx.qry.path);
 		break;
 	case CMD_COMMIT:
 		cgit_print_commit(ctx.qry.sha1);
 		break;
 	case CMD_REFS:
 		cgit_print_refs();
 		break;
 	case CMD_TAG:
 		cgit_print_tag(ctx.qry.sha1);
 		break;
 	case CMD_DIFF:
 		cgit_print_diff(ctx.qry.sha1, ctx.qry.sha2, ctx.qry.path);
 		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 (ctx.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 > ctx.cfg.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)) {
 			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);
 		}
 	}
 }
 
 int main(int argc, const char **argv)
 {
 	struct cacheitem item;
 	const char *cgit_config_env = getenv("CGIT_CONFIG");
 
 	cgit_prepare_context(&ctx);
 	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);
 	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);
 	cgit_parse_query(ctx.qry.raw, cgit_querystring_cb);
 	if (!cgit_prepare_cache(&item))
 		return 0;
 	if (ctx.cfg.nocache) {
 		cgit_fill_cache(&item, 0);
 	} else {
 		cgit_check_cache(&item);
 		cgit_print_cache(&item);
 	}
 	return 0;
 }
diff --git a/ui-shared.c b/ui-shared.c
index b9f487a..cc1ab8b 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -287,284 +287,284 @@ void cgit_object_link(struct object *obj)
 				 ctx.qry.head, sha1_to_hex(obj->sha1));
 		return;
 	} else if (obj->type == OBJ_TREE) {
 		page = "tree";
 		arg = "id";
 	} else if (obj->type == OBJ_TAG) {
 		page = "tag";
 		arg = "id";
 	} else {
 		page = "blob";
 		arg = "id";
 	}
 
 	url = cgit_pageurl(ctx.qry.repo, page,
 			   fmt("%s=%s", arg, sha1_to_hex(obj->sha1)));
 	html_link_open(url, NULL, NULL);
 	htmlf("%s %s", typename(obj->type),
 	      sha1_to_hex(obj->sha1));
 	html_link_close();
 }
 
 void cgit_print_date(time_t secs, char *format)
 {
 	char buf[64];
 	struct tm *time;
 
 	if (!secs)
 		return;
 	time = gmtime(&secs);
 	strftime(buf, sizeof(buf)-1, format, time);
 	html_txt(buf);
 }
 
 void cgit_print_age(time_t t, time_t max_relative, char *format)
 {
 	time_t now, secs;
 
 	if (!t)
 		return;
 	time(&now);
 	secs = now - t;
 
 	if (secs > max_relative && max_relative >= 0) {
 		cgit_print_date(t, format);
 		return;
 	}
 
 	if (secs < TM_HOUR * 2) {
 		htmlf("<span class='age-mins'>%.0f min.</span>",
 		      secs * 1.0 / TM_MIN);
 		return;
 	}
 	if (secs < TM_DAY * 2) {
 		htmlf("<span class='age-hours'>%.0f hours</span>",
 		      secs * 1.0 / TM_HOUR);
 		return;
 	}
 	if (secs < TM_WEEK * 2) {
 		htmlf("<span class='age-days'>%.0f days</span>",
 		      secs * 1.0 / TM_DAY);
 		return;
 	}
 	if (secs < TM_MONTH * 2) {
 		htmlf("<span class='age-weeks'>%.0f weeks</span>",
 		      secs * 1.0 / TM_WEEK);
 		return;
 	}
 	if (secs < TM_YEAR * 2) {
 		htmlf("<span class='age-months'>%.0f months</span>",
 		      secs * 1.0 / TM_MONTH);
 		return;
 	}
 	htmlf("<span class='age-years'>%.0f years</span>",
 	      secs * 1.0 / TM_YEAR);
 }
 
 void cgit_print_docstart(char *title, struct cacheitem *item)
 {
 	html("Content-Type: text/html; charset=" PAGE_ENCODING "\n");
 	htmlf("Last-Modified: %s\n", http_date(item->st.st_mtime));
 	htmlf("Expires: %s\n", http_date(item->st.st_mtime +
 					 ttl_seconds(item->ttl)));
 	html("\n");
 	html(cgit_doctype);
 	html("<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en' lang='en'>\n");
 	html("<head>\n");
 	html("<title>");
 	html_txt(title);
 	html("</title>\n");
 	htmlf("<meta name='generator' content='cgit %s'/>\n", cgit_version);
 	if (ctx.cfg.robots && *ctx.cfg.robots)
 		htmlf("<meta name='robots' content='%s'/>\n", ctx.cfg.robots);
 	html("<link rel='stylesheet' type='text/css' href='");
 	html_attr(ctx.cfg.css);
 	html("'/>\n");
 	html("</head>\n");
 	html("<body>\n");
 }
 
 void cgit_print_docend()
 {
 	html("</td>\n</tr>\n</table>\n</body>\n</html>\n");
 }
 
 int print_branch_option(const char *refname, const unsigned char *sha1,
 			int flags, void *cb_data)
 {
 	char *name = (char *)refname;
 	html_option(name, name, ctx.qry.head);
 	return 0;
 }
 
 int print_archive_ref(const char *refname, const unsigned char *sha1,
 		       int flags, void *cb_data)
 {
 	struct tag *tag;
 	struct taginfo *info;
 	struct object *obj;
 	char buf[256], *url;
 	unsigned char fileid[20];
 	int *header = (int *)cb_data;
 
 	if (prefixcmp(refname, "refs/archives"))
 		return 0;
 	strncpy(buf, refname+14, sizeof(buf));
 	obj = parse_object(sha1);
 	if (!obj)
 		return 1;
 	if (obj->type == OBJ_TAG) {
 		tag = lookup_tag(sha1);
 		if (!tag || parse_tag(tag) || !(info = cgit_parse_tag(tag)))
 			return 0;
 		hashcpy(fileid, tag->tagged->sha1);
 	} else if (obj->type != OBJ_BLOB) {
 		return 0;
 	} else {
 		hashcpy(fileid, sha1);
 	}
 	if (!*header) {
 		html("<h1>download</h1>\n");
 		*header = 1;
 	}
 	url = cgit_pageurl(ctx.qry.repo, "blob",
 			   fmt("id=%s&amp;path=%s", sha1_to_hex(fileid),
 			       buf));
 	html_link_open(url, NULL, "menu");
 	html_txt(strlpart(buf, 20));
 	html_link_close();
 	return 0;
 }
 
 void add_hidden_formfields(int incl_head, int incl_search, char *page)
 {
 	char *url;
 
 	if (!ctx.cfg.virtual_root) {
 		url = fmt("%s/%s", ctx.qry.repo, page);
 		if (ctx.qry.path)
 			url = fmt("%s/%s", url, ctx.qry.path);
 		html_hidden("url", url);
 	}
 
 	if (incl_head && strcmp(ctx.qry.head, ctx.repo->defbranch))
 		html_hidden("h", ctx.qry.head);
 
 	if (ctx.qry.sha1)
 		html_hidden("id", ctx.qry.sha1);
 	if (ctx.qry.sha2)
 		html_hidden("id2", ctx.qry.sha2);
 
 	if (incl_search) {
 		if (ctx.qry.grep)
 			html_hidden("qt", ctx.qry.grep);
 		if (ctx.qry.search)
 			html_hidden("q", ctx.qry.search);
 	}
 }
 
 void cgit_print_pageheader(char *title, int show_search)
 {
 	static const char *default_info = "This is cgit, a fast webinterface for git repositories";
 	int header = 0;
 	char *url;
 
 	html("<table id='layout' summary=''>\n");
 	html("<tr><td id='sidebar'>\n");
 	html("<table class='sidebar' cellspacing='0' summary=''>\n");
 	html("<tr><td class='sidebar'>\n<a href='");
 	html_attr(cgit_rooturl());
 	htmlf("'><img src='%s' alt='cgit'/></a>\n",
 	      ctx.cfg.logo);
 	html("</td></tr>\n<tr><td class='sidebar'>\n");
-	if (ctx.qry.repo) {
+	if (ctx.repo) {
 		html("<h1 class='first'>");
 		html_txt(strrpart(ctx.repo->name, 20));
 		html("</h1>\n");
 		html_txt(ctx.repo->desc);
 		if (ctx.repo->owner) {
 			html("<h1>owner</h1>\n");
 			html_txt(ctx.repo->owner);
 		}
 		html("<h1>navigate</h1>\n");
 		reporevlink(NULL, "summary", NULL, "menu", ctx.qry.head,
 			    NULL, NULL);
 		cgit_log_link("log", NULL, "menu", ctx.qry.head, NULL, NULL,
 			      0, NULL, NULL);
 		cgit_tree_link("tree", NULL, "menu", ctx.qry.head,
 			       ctx.qry.sha1, NULL);
 		cgit_commit_link("commit", NULL, "menu", ctx.qry.head,
 			      ctx.qry.sha1);
 		cgit_diff_link("diff", NULL, "menu", ctx.qry.head,
 			       ctx.qry.sha1, ctx.qry.sha2, NULL);
 		cgit_patch_link("patch", NULL, "menu", ctx.qry.head,
 				ctx.qry.sha1);
 
 		for_each_ref(print_archive_ref, &header);
 
 		if (ctx.repo->clone_url || ctx.cfg.clone_prefix) {
 			html("<h1>clone</h1>\n");
 			if (ctx.repo->clone_url)
 				url = ctx.repo->clone_url;
 			else
 				url = fmt("%s%s", ctx.cfg.clone_prefix,
 					  ctx.repo->url);
 			html("<a class='menu' href='");
 			html_attr(url);
 			html("' title='");
 			html_attr(url);
 			html("'>\n");
 			html_txt(strrpart(url, 20));
 			html("</a>\n");
 		}
 
 		html("<h1>branch</h1>\n");
 		html("<form method='get' action=''>\n");
 		add_hidden_formfields(0, 1, ctx.qry.page);
 //		html("<table summary='branch selector' class='grid'><tr><td id='branch-dropdown-cell'>");
 		html("<select name='h' onchange='this.form.submit();'>\n");
 		for_each_branch_ref(print_branch_option, ctx.qry.head);
 		html("</select>\n");
 //		html("</td><td>");
 		html("<noscript><input type='submit' id='switch-btn' value='switch'/></noscript>\n");
 //		html("</td></tr></table>");
 		html("</form>\n");
 
 		html("<h1>search</h1>\n");
 		html("<form method='get' action='");
 		if (ctx.cfg.virtual_root)
 			html_attr(cgit_fileurl(ctx.qry.repo, "log",
 					       ctx.qry.path, NULL));
 		html("'>\n");
 		add_hidden_formfields(1, 0, "log");
 		html("<select name='qt'>\n");
 		html_option("grep", "log msg", ctx.qry.grep);
 		html_option("author", "author", ctx.qry.grep);
 		html_option("committer", "committer", ctx.qry.grep);
 		html("</select>\n");
 		html("<input class='txt' type='text' name='q' value='");
 		html_attr(ctx.qry.search);
 		html("'/>\n");
 		html("</form>\n");
 	} else {
 		if (!ctx.cfg.index_info || html_include(ctx.cfg.index_info))
 			html(default_info);
 	}
 
 	html("</td></tr></table></td>\n");
 
 	html("<td id='content'>\n");
 }
 
 
 void cgit_print_snapshot_start(const char *mimetype, const char *filename,
 			       struct cacheitem *item)
 {
 	htmlf("Content-Type: %s\n", mimetype);
 	htmlf("Content-Disposition: inline; filename=\"%s\"\n", filename);
 	htmlf("Last-Modified: %s\n", http_date(item->st.st_mtime));
 	htmlf("Expires: %s\n", http_date(item->st.st_mtime +
 					 ttl_seconds(item->ttl)));
 	html("\n");
 }
 
 /* vim:set sw=8: */