9990-misc-helpers.sh: remove mdadm.conf in initramfs if existent.

[live-boot-grml.git] / components / 9990-misc-helpers.sh

diff --git a/components/9990-misc-helpers.sh b/components/9990-misc-helpers.sh
index 535d592..d14b072 100755 (executable)
--- a/components/9990-misc-helpers.sh
+++ b/components/9990-misc-helpers.sh
@@ -268,6 +268,21 @@ check_dev ()
                                # Adding raid support
                                if [ -x /scripts/local-block/mdadm ]
                                then
+                                       # Before actually doing anything, make sure that no auto-generated
+                                       # mdadm.conf is around in the initramfs.
+                                       # Short explanation of why this is needed:
+                                       # /usr/share/initramfs-tools/hooks/mdadm is executed as part of
+                                       # mkinitramfs, which generates an /etc/mdadm/mdadm.conf file if one
+                                       # doesn't exist yet (which should always be the case in our new
+                                       # chroot) based on the host system configuration. Eventually, this
+                                       # is copied into the generated initramfs and then causes issues on
+                                       # other systems.
+                                       # It's safe to delete the file within the initramfs. The actual
+                                       # squashfs root will not be affected by that (and, additionally,
+                                       # a FAI script makes sure that the mdadm.conf in there gets wiped
+                                       # of any auto-generated arrays).
+                                       rm -rf '/etc/mdadm/mdadm.conf'
+
                                        # Back in the day, when there was still a local-top mdadm script, we
                                        # used to select specific devices to be auto-assembled.
                                        # This functionality was dropped in the local-block script, so just