dracut: Add ostree-remount

Linux creates a copy of the soure mount flags when creating a bind
mount; if the source is read-only, then the bind mount is.

The problem is that systemd will remount the rootfs read/write, but
each mount (/home, /var etc.) will still be read-only.  We need to
remount every bind mount except for /usr to read-write too.

This only "worked" with the old ostree-switch-root because it
effectively force mounted the rootfs read-write always, ignoring the
"ro" flag.

1 files changed, 50 insertions, 0 deletions

diff --git a/src/switchroot/ostree-mount-util.c b/src/switchroot/ostree-mount-util.c
new file mode 100644
index 00000000..c993c238
--- /dev/null
+++ b/src/switchroot/ostree-mount-util.c
@@ -0,0 +1,50 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
+ *
+ * Copyright (C) 2011,2013 Colin Walters <walters@verbum.org>
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: Colin Walters <walters@verbum.org>
+ */
+
+#define _GNU_SOURCE
+
+#include <stdarg.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "ostree-mount-util.h"
+
+int
+perrorv (const char *format, ...)
+{
+  va_list args;
+  char buf[1024];
+  char *p;
+
+  p = strerror_r (errno, buf, sizeof (buf));
+
+  va_start (args, format);
+
+  vfprintf (stderr, format, args);
+  fprintf (stderr, ": %s\n", p);
+  fflush (stderr);
+
+  va_end (args);
+
+  return 0;
+}