From 2789c57616056b936e33603e297e8320f83b97c0 Mon Sep 17 00:00:00 2001
From: Christian Nilsson <nikize@gmail.com>
Date: Wed, 25 Jul 2018 01:08:23 +0200
Subject: [PATCH] linuxrc: Add detection of squashfs in initrd root

Allows for the squashfs to be found in the initrd root without mounting CD
This allows iPXE boot by adding the squashfs in a extra cpio initrd

Related: https://bugs.gentoo.org/74628
Related: https://bugs.gentoo.org/494300
Closes: https://bugs.gentoo.org/396467
Signed-off-by: Christian Nilsson <nikize@gmail.com>
---
 defaults/initrd.defaults |  5 +++++
 defaults/linuxrc         | 21 +++++++++++++++------
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/defaults/initrd.defaults b/defaults/initrd.defaults
index 924bdea..2bf14f4 100755
--- a/defaults/initrd.defaults
+++ b/defaults/initrd.defaults
@@ -70,6 +70,11 @@ CDROOT_PATH='/mnt/cdrom'
 CDROOT_MARKER='/livecd'
 VERIFY=0
 
+# Flag for if ok when using CDROOT
+got_good_root='0'
+# if LOOP found on root before mount, trigger Unpacking additional packages
+got_loop_wo_mount='0'
+
 # AUFS variables
 aufs=0
 aufs_union_file=/livecd.aufs
diff --git a/defaults/linuxrc b/defaults/linuxrc
index 81e7799..17697fc 100644
--- a/defaults/linuxrc
+++ b/defaults/linuxrc
@@ -431,6 +431,15 @@ then
 	startiscsi
 fi
 
+# Loop file already exists on fs, assume no mount needed,
+# This allows for squashfs in initrd, which can be used for (i)PXE booting
+if [ -e "${LOOP}" ]
+then
+	got_good_root=1
+	got_loop_wo_mount=1
+	CDROOT_PATH=$(dirname "${LOOP}")
+fi
+
 # Apply scan delay if specified
 sdelay
 
@@ -497,16 +506,16 @@ then
 	if [ 1 = "$aufs" ]; then
                 setup_aufs
 		CHROOT=$aufs_union
-        elif [ 1 = "$overlayfs" ]; then
+        elif [ 1 = "$overlayfs" ] && [ "${got_good_root}" != '1' ]; then
                 bootstrapCD
 		CHROOT=${NEW_ROOT}
 	fi
 
-	if [ /dev/nfs != "$REAL_ROOT" ] && [ sgimips != "$LOOPTYPE" ] && [ 1 != "$aufs" ] && [ 1 != "$overlayfs" ]; then
+	if [ "${got_good_root}" != '1' ] && [ /dev/nfs != "$REAL_ROOT" ] && [ sgimips != "$LOOPTYPE" ] && [ 1 != "$aufs" ] && [ 1 != "$overlayfs" ]; then
 		bootstrapCD
 	fi
 
-	if [ "${REAL_ROOT}" = '' ]
+	if [ "${REAL_ROOT}" = '' ] && [ "${got_good_root}" != '1' ]
 	then
 		warn_msg "No bootable medium found. Waiting for new devices..."
 		COUNTER=0
@@ -518,7 +527,7 @@ then
 		bootstrapCD
 	fi
 
-	if [ "${REAL_ROOT}" = '' ]
+	if [ "${REAL_ROOT}" = '' ] && [ "${got_good_root}" != '1' ]
 	then
 		# Undo stuff
 		umount  "${NEW_ROOT}/dev" 2>/dev/null
@@ -865,10 +874,10 @@ FSTAB
                 fi
 	fi
 
-	# Unpacking additional packages from NFS mount
+	# Unpacking additional packages from NFS mount, or root (if squashfs was found there)
 	# This is useful for adding kernel modules to /lib
 	# We do this now, so that additional packages can add whereever they want.
-	if [ "${REAL_ROOT}" = '/dev/nfs' ]
+	if [ "${REAL_ROOT}" = '/dev/nfs' ] || [ "${got_loop_wo_mount}" == '1' ]
 	then
 		if [ -e "${CDROOT_PATH}/add" ]
 		then
-- 
2.16.4