efi: add efi boot generator that automatically mounts the ESP to /boot

1 files changed, 117 insertions, 0 deletions

diff --git a/src/efi-boot-generator/efi-boot-generator.c b/src/efi-boot-generator/efi-boot-generator.c
new file mode 100644
index 0000000000..ee6ec31c0e
--- /dev/null
+++ b/src/efi-boot-generator/efi-boot-generator.c
@@ -0,0 +1,117 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 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 <unistd.h>
+#include <stdlib.h>
+
+#include "efivars.h"
+#include "path-util.h"
+#include "util.h"
+
+static const char *arg_dest = NULL;
+
+int main(int argc, char *argv[]) {
+        int r = EXIT_SUCCESS;
+        sd_id128_t id;
+        _cleanup_free_ char *name = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+
+        if (argc > 1 && argc != 4) {
+                log_error("This program takes three or no arguments.");
+                return EXIT_FAILURE;
+        }
+
+        if (argc > 1)
+                arg_dest = argv[3];
+
+        log_set_target(LOG_TARGET_SAFE);
+        log_parse_environment();
+        log_open();
+
+        umask(0022);
+
+        if (!is_efiboot())
+                return EXIT_SUCCESS;
+
+        if (dir_is_empty("/boot") <= 0)
+                return EXIT_SUCCESS;
+
+        r = efi_get_loader_device_part_uuid(&id);
+        if (r == -ENOENT)
+                return EXIT_SUCCESS;
+        if (r < 0) {
+                log_error("Failed to read ESP partition UUID: %s", strerror(-r));
+                return EXIT_FAILURE;
+        }
+
+        name = strjoin(arg_dest, "/boot.mount", NULL);
+        if (!name) {
+                log_oom();
+                return EXIT_FAILURE;
+        }
+
+        f = fopen(name, "wxe");
+        if (!f) {
+                log_error("Failed to create mount unit file %s: %m", name);
+                return EXIT_FAILURE;
+        }
+
+        fprintf(f,
+                "# Automatially generated by systemd-efi-boot-generator\n\n"
+                "[Mount]\n"
+                "Where=/boot\n"
+                "What=/dev/disk/by-partuuid/%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n"
+                "Options=umask=0077\n",
+                SD_ID128_FORMAT_VAL(id));
+
+        free(name);
+        name = strjoin(arg_dest, "/boot.automount", NULL);
+        if (!name) {
+                log_oom();
+                return EXIT_FAILURE;
+        }
+
+        fclose(f);
+        f = fopen(name, "wxe");
+        if (!f) {
+                log_error("Failed to create automount unit file %s: %m", name);
+                return EXIT_FAILURE;
+        }
+
+        fprintf(f,
+                "# Automatially generated by systemd-efi-boot-generator\n\n"
+                "[Automount]\n"
+                "Where=/boot\n");
+
+        free(name);
+        name = strjoin(arg_dest, "/local-fs.target.wants/boot.automount", NULL);
+        if (!name) {
+                log_oom();
+                return EXIT_FAILURE;
+        }
+
+        if (symlink("../boot.automount", name) < 0) {
+                log_error("Failed to create symlink: %m");
+                return EXIT_FAILURE;
+        }
+
+        return 0;
+}