livenet: add livenet-generator

Resolves issues where systemd attempts to boot a live URL as an NFS mount.

This patch uses systemd's generator arg[2] to generate an early sysroot.mount
that preempts systemd-fstab-generator.

See https://bugzilla.redhat.com/show_bug.cgi?id=1280103

diff --git a/modules.d/90livenet/livenet-generator.sh b/modules.d/90livenet/livenet-generator.sh
new file mode 100644 (file)
index 0000000..377d53b
--- /dev/null
+++ b/modules.d/90livenet/livenet-generator.sh
@@ -0,0 +1,57 @@
+#!/bin/sh
+
+type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
+
+[ -z "$root" ] && root=$(getarg root=)
+
+# support legacy syntax of passing liveimg and then just the base root
+if getargbool 0 rd.live.image -d -y liveimg; then
+    liveroot="live:$root"
+fi
+
+if [ "${root%%:*}" = "live" ] ; then
+    liveroot=$root
+fi
+
+[ "${liveroot%%:*}" = "live" ] || exit 0
+
+case "$liveroot" in
+    live:http://*|http://*) \
+        root="${root#live:}"
+        rootok=1 ;;
+    live:https://*|https://*) \
+        root="${root#live:}"
+        rootok=1 ;;
+    live:ftp://*|ftp://*) \
+        root="${root#live:}"
+        rootok=1 ;;
+    live:torrent://*|torrent://*) \
+        root="${root#live:}"
+        rootok=1 ;;
+    live:tftp://*|tftp://*) \
+        root="${root#live:}"
+        rootok=1 ;;
+esac
+
+[ "$rootok" != "1" ] && exit 0
+
+GENERATOR_DIR="$2"
+[ -z "$GENERATOR_DIR" ] && exit 1
+
+[ -d "$GENERATOR_DIR" ] || mkdir "$GENERATOR_DIR"
+
+ROOTFLAGS="$(getarg rootflags)"
+{
+    echo "[Unit]"
+    echo "Before=initrd-root-fs.target"
+    echo "[Mount]"
+    echo "Where=/sysroot"
+    echo "What=/dev/mapper/live-rw"
+    [ -n "$ROOTFLAGS" ] && echo "Options=${ROOTFLAGS}"
+} > "$GENERATOR_DIR"/sysroot.mount
+
+mkdir -p "$GENERATOR_DIR/dev-mapper-live\x2drw.device.d"
+{
+    echo "[Unit]"
+    echo "JobTimeoutSec=3000"
+} > "$GENERATOR_DIR/dev-mapper-live\x2drw.device.d/timeout.conf"

diff --git a/modules.d/90livenet/module-setup.sh b/modules.d/90livenet/module-setup.sh
index f1e757e786a1f0d54c741779711d95e5c8ffe7b5..3a8d4ba8d4eb9e5e5d63038349c2279dac8b274e 100755 (executable)
--- a/modules.d/90livenet/module-setup.sh
+++ b/modules.d/90livenet/module-setup.sh
@@ -17,6 +17,6 @@ install() {
     inst_hook cmdline 29 "$moddir/parse-livenet.sh"
     inst_hook initqueue/online 95 "$moddir/fetch-liveupdate.sh"
     inst_script "$moddir/livenetroot.sh" "/sbin/livenetroot"
+    inst_script "$moddir/livenet-generator.sh" $systemdutildir/system-generators/dracut-livenet-generator
     dracut_need_initqueue
 }
-