live, grub, isolinux: new target use/live/rescue

The new target adds rescue mode to the regular livecd.
live should do not be installable, since in it serious changes
that are unacceptable for a normal system.

features.in/grub/cfg.in/33live-rescue.cfg

@@ -0,0 +1,8 @@
+menuentry $"Rescue LiveCD" --id 'live_rescue' {
+  savedefault
+  echo $"Loading Linux vmlinuz$KFLAVOUR ..."
+  linux /boot/vmlinuz$KFLAVOUR fastboot live @initrd_bootargs@ @stagename@=live systemd.unit=live-rescue.target ramdisk_size=@live_size@ nosplash vga=@bootvga@ @rescue_bootargs@ $EFI_BOOTARGS lang=$lang lowmem
+  echo $"Loading initial ramdisk ..."
+  initrd /boot/@initrd@$KFLAVOUR.@initrd_ext@
+}
+

features.in/live/config.mk

@@ -99,6 +99,11 @@ else
 use/live/suspend: use/live; @:
 endif
 
+# live as Rescue
+use/live/rescue: use/live use/grub/live-rescue.cfg use/syslinux/live-rescue.cfg
+	@$(call add,LIVE_PACKAGES,startup-rescue)
+	@$(call add,LIVE_LISTS,tagged/base+rescue)
+
 # for kiosks
 use/live/runapp: use/live
 	@$(call add,LIVE_PACKAGES,livecd-runapp)

features.in/live/live/image-scripts.d/30-live-rescue-root

@@ -0,0 +1,60 @@
+#!/bin/sh -efu
+
+# don't cripple the image to be copied over
+[ -n "${GLOBAL_LIVE_INSTALL-}" ] || \
+	[ -x /usr/sbin/live-install ] || \
+	[ -x /usr/sbin/livecd-install ] && exit 0
+
+[ -x /sbin/rescue-launcher ] || [ -x /usr/bin/rescue-shell-show ] || exit 0
+
+# for systemd only
+rpm -q systemd-sysvinit >/dev/null 2>&1 || exit 0
+
+# disable issue "Hello friend, say '$LIVECD_LOGIN' to log in at"
+[ ! -f /etc/sysconfig/livecd-user ] ||
+    sed -i 's/^#LIVECD_NO_ISSUE=1/LIVECD_NO_ISSUE=1/' /etc/sysconfig/livecd-user
+
+mkdir -p /etc/systemd/system/getty@.service.d
+cat>>/etc/systemd/system/getty@.service.d/override.conf<<'EOF'
+[Service]
+Type=simple
+ExecStart=
+ExecStart=-agetty -a root --noclear - $TERM
+EOF
+
+mkdir -p /etc/systemd/system/live-rescue.target.d
+cat>>/etc/systemd/system/live-rescue.target<<'EOF'
+[Unit]
+Description=Live Rescue System
+Documentation=man:systemd.special(7)
+Requires=basic.target network.target getty.target
+Conflicts=rescue.service rescue.target multi-user.target
+Conflicts=altlinux-first_time.service vconsole-setup-kludge@tty1.service
+Before=altlinux-first_time.service vconsole-setup-kludge@.service
+After=basic.target rescue.service rescue.target multi-user.target
+After=getty.target
+AllowIsolate=yes
+EOF
+
+cat>>/root/.bash_profile<<'EOF'
+if grep -qsv 'init=' /proc/cmdline; then
+
+EOF
+
+[ -x /sbin/rescue-launcher ] && cat>>/root/.bash_profile<<'EOF'
+	if grep -wqs autorun /proc/cmdline; then
+		if [ -x /sbin/rescue-launcher ]; then
+			if [ "$(tty 2>/dev/null)" = "/dev/tty1" ]; then
+				/sbin/rescue-launcher "$@"
+			fi
+		fi
+	fi
+
+EOF
+
+[ -x /usr/bin/rescue-shell-show ] && cat>>/root/.bash_profile<<'EOF'
+rescue-shell-show
+
+EOF
+
+echo "fi" >> /root/.bash_profile

features.in/syslinux/cfg.in/33live-rescue.cfg

@@ -0,0 +1,5 @@
+label live_rescue
+  menu label ^Rescue LiveCD
+  kernel /boot/vmlinuz
+  append initrd=/boot/@initrd@ fastboot live @initrd_bootargs@ @stagename@=live systemd.unit=live-rescue.target ramdisk_size=@live_size@ nosplash showopts vga=@bootvga@ @rescue_bootargs@ lowmem
+