95qeth_rules: Add new module to copy qeth rules

Only pick rules for interfaces which have a carrier in the running
system. Those interfaces will be assembled by udev to allow booting
from those devices (i.e. iSCSI).

Reference: FATE#323440

modules.d/95qeth_rules/module-setup.sh

@@ -0,0 +1,59 @@
+#!/bin/bash
+
+# called by dracut
+check() {
+    local _arch=$(uname -m)
+    local _online=0
+    [ "$_arch" = "s390" -o "$_arch" = "s390x" ] || return 1
+    require_binaries /usr/lib/udev/collect || return 1
+    dracut_module_included network || return 1
+
+    [[ $hostonly ]] && {
+        for i in /sys/devices/qeth/*/online; do
+            read _online < $i
+            [ $_online -eq 1 ] && return 0
+	done
+    }
+    return 255
+}
+
+# called by dracut
+installkernel() {
+   instmods qeth
+}
+
+# called by dracut
+install() {
+    ccwid() {
+        qeth_path=$(readlink -e -q $1/device)
+        basename "$qeth_path"
+    }
+
+    inst_rules_qeth() {
+        for rule in /etc/udev/rules.d/{4,5}1-qeth-${1}.rules; do
+           # prefer chzdev generated 41- rules
+           if [ -f "$rule" ]; then
+              inst_rules "$rule"
+              break
+           fi
+        done
+    }
+
+    has_carrier() {
+        carrier=0
+        # not readable in qeth interfaces
+        # that have just been assembled, ignore
+        # read error and assume no carrier
+        read carrier 2>/dev/null < "$1/carrier"
+        [ "$carrier" -eq 1 ] && return 0
+        return 1;
+    }
+
+    for dev in /sys/class/net/*; do
+        has_carrier $dev || continue
+        id=$(ccwid $dev)
+        [ -n "$id" ] && inst_rules_qeth $id
+    done
+
+    inst_simple /usr/lib/udev/collect
+}