The failure is due to grub_probe() returning more than one line when
using btrfs. In the case of a 4-device raid1 created with:
make.btrfs -m raid1 -d raid1 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sds1
grub_probe() returns and assigns to $rootfs:
/dev/sda1
/dev/sdb1
/dev/sdc1
/dev/sdd1
which causes calls to mapdevfs to fail since it receives 4 arguments
with error code 1 and message "Wrong number of args: mapdevfs <path>".
The fix is to amend the grub-installer script's grub_probe() function:
diff -u grub-installer.orig grub-installer
--- grub-installer.orig 2014-08-10 04:22:23.009006148 +0100
+++ grub-installer 2014-08-10 04:22:38.249815612 +0100
@@ -113,7 +113,7 @@
apt-install grub-common
is_grub_common_installed=true
fi
- $chroot $ROOT grub-probe $@
+ $chroot $ROOT grub-probe $@ | head -1
}
** Changed in: grub-installer (Ubuntu)
Status: In Progress => Triaged
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https://bugs.launchpad.net/bugs/1354730
Title:
14.04 grub-install failed: Wrong number of args: mapdevfs <path>
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