generators: rework mount generators

- Add support for finding and mounting /srv based on GPT data, similar
  to how we already handly /home.

- Share the fsck logic between GPT, EFI and fstab generators

- Make sure we never run the EFI generator inside containers

- Drop DefaultDependencies=no from EFI mount units

- Other fixes

src/shared/generator.c

@@ -0,0 +1,84 @@
+/*-*- 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 <unistd.h>
+
+#include "util.h"
+#include "special.h"
+#include "mkdir.h"
+#include "unit-name.h"
+#include "generator.h"
+
+int generator_write_fsck_deps(
+                FILE *f,
+                const char *dest,
+                const char *what,
+                const char *where,
+                const char *type) {
+
+        assert(f);
+
+        if (!is_device_path(what)) {
+                log_warning("Checking was requested for \"%s\", but it is not a device.", what);
+                return 0;
+        }
+
+        if (type && !streq(type, "auto")) {
+                const char *checker;
+                int r;
+
+                checker = strappenda("/sbin/fsck.", type);
+                r = access(checker, X_OK);
+                if (r < 0) {
+                        log_warning("Checking was requested for %s, but %s cannot be used: %m", what, checker);
+
+                        /* treat missing check as essentially OK */
+                        return errno == ENOENT ? 0 : -errno;
+                }
+        }
+
+        if (streq(where, "/")) {
+                char *lnk;
+
+                lnk = strappenda(dest, "/" SPECIAL_LOCAL_FS_TARGET ".wants/systemd-fsck-root.service");
+
+                mkdir_parents(lnk, 0755);
+                if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-fsck-root.service", lnk) < 0) {
+                        log_error("Failed to create symlink %s: %m", lnk);
+                        return -errno;
+                }
+
+        } else {
+                _cleanup_free_ char *fsck = NULL;
+
+                fsck = unit_name_from_path_instance("systemd-fsck", what, ".service");
+                if (!fsck)
+                        return log_oom();
+
+                fprintf(f,
+                        "RequiresOverridable=%s\n"
+                        "After=%s\n",
+                        fsck,
+                        fsck);
+        }
+
+        return 0;
+}

src/shared/generator.h

@@ -0,0 +1,26 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  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 <stdio.h>
+
+int generator_write_fsck_deps(FILE *f, const char *dest, const char *what, const char *where, const char *type);

src/shared/gpt.h

@@ -0,0 +1,28 @@
+/*-*- 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 "sd-id128.h"
+
+#define GPT_ESP  SD_ID128_MAKE(c1,2a,73,28,f8,1f,11,d2,ba,4b,00,a0,c9,3e,c9,3b)
+#define GPT_ROOT SD_ID128_MAKE(4f,68,bc,e3,e8,cd,4d,b1,96,e7,fb,ca,f9,84,b7,09)
+#define GPT_SWAP SD_ID128_MAKE(06,57,fd,6d,a4,ab,43,c4,84,e5,09,33,c8,4b,4f,4f)
+#define GPT_HOME SD_ID128_MAKE(93,3a,c7,e1,2e,b4,4f,13,b8,44,0e,14,e2,ae,f9,15)
+#define GPT_SRV  SD_ID128_MAKE(3b,8f,84,25,20,e0,4f,3b,90,7f,1a,25,a7,6f,98,e8)