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init: preliminary support for splash image during boot

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -4,6 +4,7 @@

 VERSION=@VERSION@

 SINGLEMODE=no

 sysroot=/sysroot

+splashfile=/.splash.ctrl

 /bin/busybox mkdir -p /usr/bin /usr/sbin /proc /sys /dev $sysroot \

 	/media/cdrom /media/usb /tmp

@@ -386,7 +387,7 @@

 myopts="alpine_dev autodetect autoraid chart cryptroot cryptdm debug_init

 	dma init_args keep_apk_new modules ovl_dev pkgs quiet root_size root

-	usbdelay ip alpine_repo apkovl alpine_start nofbcon"

+	usbdelay ip alpine_repo apkovl alpine_start nofbcon splash"

 for opt; do

 	case "$opt" in

@@ -677,6 +678,14 @@

 	rm -f "$sysroot/etc/.default_boot_services"

 fi

+if [ "$KOPT_splash" != "no" -a -e $ALPINE_MNT/fbsplash.ppm -a -e $ALPINE_MNT/fbsplash.cfg ]; then

+	ebegin "Starting bootsplash (from $ALPINE_MNT)"

+	setsid fbsplash -T 16 -s $ALPINE_MNT/fbsplash.ppm -i $ALPINE_MNT/fbsplash.cfg -f $sysroot/$splashfile &

+	eend 0

+else

+	KOPT_splash="no"

+fi

+

 if [ -f $sysroot/etc/fstab ]; then

 	has_fstab=1

@@ -742,7 +751,6 @@

 	apkflags="$apkflags --clean-protected"

 	[ -n "$ovlfiles" ] && apkflags="$apkflags --overlay-from-stdin"

 fi

-

 if [ -n "$ovlfiles" ]; then

 	apk add --root $sysroot $repo_opt $apkflags $pkgs <$ovlfiles

 else

@@ -793,6 +801,7 @@

 fi

 if [ ! -x $sysroot/sbin/init ]; then

+	[ "$KOPT_splash" != "no" ] && echo exit > $sysroot/$splashfile

 	echo "/sbin/init not found in new root. Launching emergency recovery shell"

 	echo "Type exit to continue boot."

 	/bin/busybox sh

@@ -807,9 +816,11 @@

 done

 sync

+[ "$KOPT_splash" = "init" ] && echo exit > $sysroot/$splashfile

 echo ""

 exec /bin/busybox switch_root $sysroot $chart_init /sbin/init $KOPT_init_args

+[ "$KOPT_splash" != "no" ] && echo exit > $sysroot/$splashfile

 echo "initramfs emergency recovery shell launched"

 exec /bin/busybox sh

 reboot