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Improve checks to make sure loop and dm-mod module are present #111

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merged 2 commits into from Nov 14, 2018
Merged

Improve checks to make sure loop and dm-mod module are present #111

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2df0d24
Improve checks to make sure loop and dm-mod module are present
jkirk Jul 24, 2018
fc0a6d8
Simplify module loading
zeha Jul 25, 2018
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34 changes: 15 additions & 19 deletions grml-debootstrap
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Expand Up @@ -1387,6 +1387,21 @@ prepare_vm() {
bailout 1
fi

# make sure loop module is present and an usable loop device exists
modprobe -q loop
if ! losetup -f >/dev/null 2>&1; then
eerror "Error finding usable loop device" ; eend 1
bailout 1
fi

# if dm-mod isn't available then kpartx will fail with
# "Is device-mapper driver missing from kernel? [...]"
modprobe -q dm-mod
if ! grep -q 'device-mapper' /proc/misc >/dev/null 2>&1 ; then
einfo "Device-mapper support missing in kernel."
bailout 1
fi

ORIG_TARGET="$TARGET" # store for later reuse

if [ -n "$VMFILE" ]; then
Expand All @@ -1404,25 +1419,6 @@ prepare_vm() {
parted -s "${TARGET}" 'mkpart primary ext4 2M -1'
parted -s "${TARGET}" 'set 1 boot on'

# if dm-mod isn't available then kpartx will fail with
# "Is device-mapper driver missing from kernel? [...]"
if ! kpartx -av "$TARGET" >/dev/null 2>&1 || ! grep -q 'device-mapper' /proc/misc >/dev/null 2>&1 ; then
einfo "Device-mapper not ready yet, trying to load dm-mod module."
modprobe dm-mod ; eend $?
fi

# make sure loop module is present
if ! losetup -f >/dev/null 2>&1; then
einfo "Can not find a usable loop device, retrying after loading loop module."
modprobe loop
if losetup -f >/dev/null 2>&1; then
einfo "Found a usable loop device now, continuing."
else
eerror "Error finding usable loop device" ; eend 1
bailout 1
fi
fi

DEVINFO=$(kpartx -asv "$TARGET") # e.g. 'add map loop0p1 (254:5): 0 20477 linear 7:0 3'
if [ -z "${DEVINFO}" ] ; then
eerror "Error setting up loopback device." ; eend 1
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