blame: improve diagnosis for "--reverse NEW"

diff --git a/credential-cache--daemon.c b/credential-cache--daemon.c
index 9365f2ce5c188d86b1b60029e4549e1bd844214f..291c0fd5e935b5abedc629697d44e5a9f57727bd 100644 (file)
--- a/credential-cache--daemon.c
+++ b/credential-cache--daemon.c
@@ -96,12 +96,12 @@ static int read_request(FILE *fh, struct credential *c,
        static struct strbuf item = STRBUF_INIT;
        const char *p;
 
-       strbuf_getline(&item, fh, '\n');
+       strbuf_getline_lf(&item, fh);
        if (!skip_prefix(item.buf, "action=", &p))
                return error("client sent bogus action line: %s", item.buf);
        strbuf_addstr(action, p);
 
-       strbuf_getline(&item, fh, '\n');
+       strbuf_getline_lf(&item, fh);
        if (!skip_prefix(item.buf, "timeout=", &p))
                return error("client sent bogus timeout line: %s", item.buf);
        *timeout = atoi(p);
@@ -126,8 +126,17 @@ static void serve_one_client(FILE *in, FILE *out)
                        fprintf(out, "password=%s\n", e->item.password);
                }
        }
-       else if (!strcmp(action.buf, "exit"))
+       else if (!strcmp(action.buf, "exit")) {
+               /*
+                * It's important that we clean up our socket first, and then
+                * signal the client only once we have finished the cleanup.
+                * Calling exit() directly does this, because we clean up in
+                * our atexit() handler, and then signal the client when our
+                * process actually ends, which closes the socket and gives
+                * them EOF.
+                */
                exit(0);
+       }
        else if (!strcmp(action.buf, "erase"))
                remove_credential(&c);
        else if (!strcmp(action.buf, "store")) {
@@ -215,7 +224,7 @@ static const char permissions_advice[] =
 "users may be able to read your cached credentials. Consider running:\n"
 "\n"
 "      chmod 0700 %s";
-static void check_socket_directory(const char *path)
+static void init_socket_directory(const char *path)
 {
        struct stat st;
        char *path_copy = xstrdup(path);
@@ -224,20 +233,27 @@ static void check_socket_directory(const char *path)
        if (!stat(dir, &st)) {
                if (st.st_mode & 077)
                        die(permissions_advice, dir);
-               free(path_copy);
-               return;
+       } else {
+               /*
+                * We must be sure to create the directory with the correct mode,
+                * not just chmod it after the fact; otherwise, there is a race
+                * condition in which somebody can chdir to it, sleep, then try to open
+                * our protected socket.
+                */
+               if (safe_create_leading_directories_const(dir) < 0)
+                       die_errno("unable to create directories for '%s'", dir);
+               if (mkdir(dir, 0700) < 0)
+                       die_errno("unable to mkdir '%s'", dir);
        }
 
-       /*
-        * We must be sure to create the directory with the correct mode,
-        * not just chmod it after the fact; otherwise, there is a race
-        * condition in which somebody can chdir to it, sleep, then try to open
-        * our protected socket.
-        */
-       if (safe_create_leading_directories_const(dir) < 0)
-               die_errno("unable to create directories for '%s'", dir);
-       if (mkdir(dir, 0700) < 0)
-               die_errno("unable to mkdir '%s'", dir);
+       if (chdir(dir))
+               /*
+                * We don't actually care what our cwd is; we chdir here just to
+                * be a friendly daemon and avoid tying up our original cwd.
+                * If this fails, it's OK to just continue without that benefit.
+                */
+               ;
+
        free(path_copy);
 }
 
@@ -264,7 +280,10 @@ int main(int argc, const char **argv)
        if (!socket_path)
                usage_with_options(usage, options);
 
-       check_socket_directory(socket_path);
+       if (!is_absolute_path(socket_path))
+               die("socket directory must be an absolute path");
+
+       init_socket_directory(socket_path);
        register_tempfile(&socket_file, socket_path);
 
        if (ignore_sighup)