Experimental overlayfs support

If aufs not available/broken we could try to use overlayfs. NB: changes below doesn't work without modified make-initrd-propagator!

Experimental overlayfs support
9f72780d · Konstantin A. Lepikhov · Michael Shigorin · 388f2d79 · 9f72780d · 9f72780d
Commit 9f72780d authored Sep 11, 2015 by Konstantin A. Lepikhov Committed by Michael Shigorin May 23, 2016
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10-stage2 features.in/stage2/stage1/modules.d/10-stage2 +1 -0

03-test-kernel features.in/stage2/stage1/scripts.d/03-test-kernel +2 -1

modules sub.in/stage1/modules +1 -0

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--- a/features.in/stage2/stage1/modules.d/10-stage2
+++ b/features.in/stage2/stage1/modules.d/10-stage2
@@ -34,6 +34,7 @@ atl2.ko
 atp870u.ko
 atp.ko
 aufs.ko
+overlay.ko
 axnet_cs.ko
 b44.ko
 bnx2.ko

--- a/features.in/stage2/stage1/scripts.d/03-test-kernel
+++ b/features.in/stage2/stage1/scripts.d/03-test-kernel
@@ -24,7 +24,8 @@ configured()
 ls $CONFIGS >&/dev/null || fatal "no stage1 kernel config found in /boot"

 # test for installer-required filesystems support
-for opt in SQUASHFS AUFS_FS $GLOBAL_STAGE1_KCONFIG; do
+for opt in SQUASHFS AUFS_FS OVERLAY_FS $GLOBAL_STAGE1_KCONFIG; do
+	[ "$opt" = AUFS_FS ] && [ $(configured "OVERLAY_FS=[my]") -a $(configured "AUFS_FS=n") ] && continue
 	configured "$opt=[my]" || fatal "stage1 kernel must have $opt support"
 done


--- a/sub.in/stage1/modules
+++ b/sub.in/stage1/modules
@@ -4,6 +4,7 @@ kernel/drivers/rtc
 af_packet.ko
 arc4.ko
 aufs.ko
+overlay.ko
 cdrom.ko
 evdev.ko
 ext4.ko