firstboot: add new component to query basic system settings on first boot, or when creating OS images offline

A new tool "systemd-firstboot" can be used either interactively on boot,
where it will query basic locale, timezone, hostname, root password
information and set it. Or it can be used non-interactively from the
command line when prepareing disk images for booting. When used
non-inertactively the tool can either copy settings from the host, or
take settings on the command line.

$ systemd-firstboot --root=/path/to/my/new/root --copy-locale --copy-root-password --hostname=waldi

The tool will be automatically invoked (interactively) now on first boot
if /etc is found unpopulated.

This also creates the infrastructure for generators to be notified via
an environment variable whether they are running on the first boot, or
not.

1 files changed, 71 insertions, 0 deletions

diff --git a/src/firstboot/firstboot-generator.c b/src/firstboot/firstboot-generator.c
new file mode 100644
index 0000000000..6d23f40fa2
--- /dev/null
+++ b/src/firstboot/firstboot-generator.c
@@ -0,0 +1,71 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "util.h"
+#include "mkdir.h"
+
+static const char *arg_dest = "/tmp";
+
+static bool is_first_boot(void) {
+        const char *e;
+
+        e = getenv("SYSTEMD_FIRST_BOOT");
+        if (!e)
+                return false;
+
+        return parse_boolean(e) > 0;
+}
+
+int main(int argc, char *argv[]) {
+        int r;
+
+        if (argc > 1 && argc != 4) {
+                log_error("This program takes three or no arguments.");
+                return EXIT_FAILURE;
+        }
+
+        if (argc > 1)
+                arg_dest = argv[2];
+
+        log_set_target(LOG_TARGET_SAFE);
+        log_parse_environment();
+        log_open();
+
+        umask(0022);
+
+        if (is_first_boot()) {
+                const char *t;
+
+                t = strappenda(arg_dest, "/default.target.wants/systemd-firstboot.service");
+
+                mkdir_parents(t, 0755);
+                if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-firstboot.service", t) < 0 && errno != EEXIST) {
+                        log_error("Failed to create firstboot service symlinks %s: %m", t);
+                        r = -errno;
+                        goto finish;
+                }
+        }
+
+        r = 0;
+
+finish:
+        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}