From: Frederic Crozat <fcrozat@suse.com>
Date: Mon, 7 Nov 2011 18:04:20 +0100
Subject: force lvm restart after cryptsetup target is reached

---
 src/cryptsetup/cryptsetup-generator.c | 57 ++++++++++++++++++++++++++++++++++-
 1 file changed, 56 insertions(+), 1 deletion(-)

diff --git a/src/cryptsetup/cryptsetup-generator.c b/src/cryptsetup/cryptsetup-generator.c
index 81b7708..1940985 100644
--- a/src/cryptsetup/cryptsetup-generator.c
+++ b/src/cryptsetup/cryptsetup-generator.c
@@ -22,6 +22,7 @@
 #include <string.h>
 #include <errno.h>
 #include <unistd.h>
+#include <stdlib.h>
 
 #include "log.h"
 #include "util.h"
@@ -64,6 +65,54 @@ static bool has_option(const char *haystack, const char *needle) {
         return false;
 }
 
+static int create_storage_after_cryptsetup (void) {
+        _cleanup_free_ char *to = NULL, *p = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+
+        if (asprintf(&p, "%s/storage-after-cryptsetup.service", arg_dest) < 0)
+                return log_oom();
+
+        if (!(f = fopen(p, "wxe"))) {
+                log_error("Failed to create unit file: %m");
+                return -errno;
+        }
+
+        fprintf(f,
+                "[Unit]\n"
+                "Description=Restart storage after cryptsetup\n"
+                "DefaultDependencies=no\n"
+                "After=cryptsetup.target\n"
+                "Wants=cryptsetup.target\n"
+                "Before=local-fs.target\n"
+                "Before=shutdown.target\n");
+
+        fprintf(f,
+                "\n[Service]\n"
+                "RemainAfterExit=true\n"
+                "Type=oneshot\n"
+                "TimeoutSec=0\n"
+                "ExecStart=/usr/bin/systemctl restart lvm.service\n");
+
+        fflush(f);
+
+        if (ferror(f)) {
+                log_error("Failed to write file: %m");
+                return -errno;
+        }
+
+        if (asprintf(&to, "%s/local-fs.target.wants/storage-after-cryptsetup.service", arg_dest) < 0)
+                return log_oom();
+
+        mkdir_parents(to, 0755);
+
+        if (symlink("../storage-after-cryptsetup.service", to) < 0) {
+                log_error("Failed to create symlink ../storage-after-cryptsetup.service to '%s': %m", to);
+                return -errno;
+        }
+
+        return 0;
+}
+
 static int create_disk(
                 const char *name,
                 const char *device,
@@ -334,6 +383,7 @@ int main(int argc, char *argv[]) {
         _cleanup_fclose_ FILE *f = NULL;
         unsigned n = 0;
         int r = EXIT_SUCCESS;
+        bool no_crypttab = false;
         char **i;
 
         if (argc > 1 && argc != 4) {
@@ -361,8 +411,10 @@ int main(int argc, char *argv[]) {
 
                 f = fopen("/etc/crypttab", "re");
                 if (!f) {
-                        if (errno == ENOENT)
+                        if (errno == ENOENT) {
+                                no_crypttab = true;
                                 r = EXIT_SUCCESS;
+                        }
                         else {
                                 r = EXIT_FAILURE;
                                 log_error("Failed to open /etc/crypttab: %m");
@@ -464,5 +516,8 @@ next:
                         r = EXIT_FAILURE;
         }
 
+        if ((r == EXIT_SUCCESS && !no_crypttab) && (create_storage_after_cryptsetup () < 0))
+                r = EXIT_FAILURE;
+
         return r;
 }