teach convert_to_git a "dry run" mode

diff --git a/daemon.c b/daemon.c
index 4c8346d5a1fe1325de2dd335a4e61a2dad994211..fa283003ea8809a2defc63f3b36cebe135028ddb 100644 (file)
--- a/daemon.c
+++ b/daemon.c
@@ -20,6 +20,7 @@
 static int log_syslog;
 static int verbose;
 static int reuseaddr;
+static int informative_errors;
 
 static const char daemon_usage[] =
 "git daemon [--verbose] [--syslog] [--export-all]\n"
@@ -108,11 +109,11 @@ static void NORETURN daemon_die(const char *err, va_list params)
        exit(1);
 }
 
-static char *path_ok(char *directory)
+static const char *path_ok(char *directory)
 {
        static char rpath[PATH_MAX];
        static char interp_path[PATH_MAX];
-       char *path;
+       const char *path;
        char *dir;
 
        dir = directory;
@@ -247,6 +248,14 @@ static int git_daemon_config(const char *var, const char *value, void *cb)
        return 0;
 }
 
+static int daemon_error(const char *dir, const char *msg)
+{
+       if (!informative_errors)
+               msg = "access denied or repository not exported";
+       packet_write(1, "ERR %s: %s", msg, dir);
+       return -1;
+}
+
 static int run_service(char *dir, struct daemon_service *service)
 {
        const char *path;
@@ -257,11 +266,11 @@ static int run_service(char *dir, struct daemon_service *service)
        if (!enabled && !service->overridable) {
                logerror("'%s': service not enabled.", service->name);
                errno = EACCES;
-               return -1;
+               return daemon_error(dir, "service not enabled");
        }
 
        if (!(path = path_ok(dir)))
-               return -1;
+               return daemon_error(dir, "no such repository");
 
        /*
         * Security on the cheap.
@@ -277,7 +286,7 @@ static int run_service(char *dir, struct daemon_service *service)
        if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
                logerror("'%s': repository not exported.", path);
                errno = EACCES;
-               return -1;
+               return daemon_error(dir, "repository not exported");
        }
 
        if (service->overridable) {
@@ -291,7 +300,7 @@ static int run_service(char *dir, struct daemon_service *service)
                logerror("'%s': service not enabled for '%s'",
                         service->name, path);
                errno = EACCES;
-               return -1;
+               return daemon_error(dir, "service not enabled");
        }
 
        /*
@@ -734,6 +743,29 @@ struct socketlist {
        size_t alloc;
 };
 
+static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
+{
+#ifdef NO_IPV6
+       static char ip[INET_ADDRSTRLEN];
+#else
+       static char ip[INET6_ADDRSTRLEN];
+#endif
+
+       switch (family) {
+#ifndef NO_IPV6
+       case AF_INET6:
+               inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
+               break;
+#endif
+       case AF_INET:
+               inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
+               break;
+       default:
+               strcpy(ip, "<unknown>");
+       }
+       return ip;
+}
+
 #ifndef NO_IPV6
 
 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
@@ -780,15 +812,22 @@ static int setup_named_sock(char *listen_addr, int listen_port, struct socketlis
 #endif
 
                if (set_reuse_addr(sockfd)) {
+                       logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
                        close(sockfd);
                        continue;
                }
 
                if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
+                       logerror("Could not bind to %s: %s",
+                                ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
+                                strerror(errno));
                        close(sockfd);
                        continue;       /* not fatal */
                }
                if (listen(sockfd, 5) < 0) {
+                       logerror("Could not listen to %s: %s",
+                                ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
+                                strerror(errno));
                        close(sockfd);
                        continue;       /* not fatal */
                }
@@ -835,16 +874,23 @@ static int setup_named_sock(char *listen_addr, int listen_port, struct socketlis
                return 0;
 
        if (set_reuse_addr(sockfd)) {
+               logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
                close(sockfd);
                return 0;
        }
 
        if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
+               logerror("Could not listen to %s: %s",
+                        ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
+                        strerror(errno));
                close(sockfd);
                return 0;
        }
 
        if (listen(sockfd, 5) < 0) {
+               logerror("Could not listen to %s: %s",
+                        ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
+                        strerror(errno));
                close(sockfd);
                return 0;
        }
@@ -1167,6 +1213,14 @@ int main(int argc, char **argv)
                        make_service_overridable(arg + 18, 0);
                        continue;
                }
+               if (!prefixcmp(arg, "--informative-errors")) {
+                       informative_errors = 1;
+                       continue;
+               }
+               if (!prefixcmp(arg, "--no-informative-errors")) {
+                       informative_errors = 0;
+                       continue;
+               }
                if (!strcmp(arg, "--")) {
                        ok_paths = &argv[i+1];
                        break;