zdev/initramfs: add s390-tools- prefix to hook, due to conflicts.

Unfortunately zdev hook already exists in Ubuntu, from an unrelated
project. ZFS uses zdev/zpool names, and ships a zdev hook to do ZFS
specific initialisation. It is available on s390x and thus results in
file-conflict upon installing both. Thus renaming this zdev hook to
s390-tools-zdev.

Closes: https://github.com/ibm-s390-tools/s390-tools/pull/41
Signed-off-by: Dimitri John Ledkov <xnox@ubuntu.com>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

zdev/initramfs/hooks/s390-tools-zdev

@@ -0,0 +1,56 @@
+#!/bin/sh
+#
+# Copyright IBM Corp. 2016, 2017
+#
+# s390-tools is free software; you can redistribute it and/or modify
+# it under the terms of the MIT license. See LICENSE for details.
+#
+# hooks/s390-tools-zdev
+#   This hook script adds files required to apply firmware-provided I/O
+#   configuration data during boot.
+#
+
+# Needs to run after udev or resulting udev rules could be overwritten
+PREREQ="udev"
+
+prereqs()
+{
+	echo "$PREREQ"
+}
+
+case $1 in
+	prereqs)
+	prereqs
+	exit 0
+	;;
+esac
+
+. /usr/share/initramfs-tools/hook-functions
+
+# Add modules for all device types supported by chzdev (required for
+# auto-configuration)
+zdev_modules="lcs qeth qeth_l2 qeth_l3 dasd_mod dasd_eckd_mod dasd_fba_mod dasd_diag_mod zfcp"
+
+for x in $zdev_modules ; do
+	manual_add_modules ${x}
+done
+
+copy_exec /sbin/chzdev
+copy_exec /sbin/lszdev
+copy_exec /sbin/vmcp
+
+_tempfile=$(mktemp --tmpdir initramfs-zdev.XXXXXX)
+
+# Obtain early + root device configuration
+chzdev --export "$_tempfile" --persistent --by-path / \
+       --by-attrib "zdev:early=1" --quiet --type 2>/dev/null
+
+# Apply via --import to prevent other devices from being configured.
+# Rename the resulting cio-ignore rule to ensure that it does not override
+# the one copied by the initramfs udev hook to /lib/udev.
+chzdev --import "$_tempfile" --persistent \
+       --base "/etc/udev/rules.d/41-cio-ignore.rules=$DESTDIR/etc/udev/rules.d/41-cio-ignore-root.rules" \
+       --base "/etc=$DESTDIR/etc" --yes --quiet --no-root-update --force \
+       >/dev/null
+
+rm -f "$_tempfile"