saving uncommitted changes in /etc prior to emerge run

init.d/bootmisc

@@ -1,4 +1,4 @@
-#!/sbin/runscript
+#!/sbin/openrc-run
 # Copyright (c) 2007-2009 Roy Marples <roy@marples.name>
 # Released under the 2-clause BSD license.
 
@@ -6,7 +6,7 @@ depend()
 {
 	need localmount
 	before logger
-	after clock sysctl
+	after clock root sysctl
 	keyword -prefix -timeout
 }
 
@@ -68,7 +68,7 @@ cleanup_var_run_dir()
 	do
 		# Clean stale sockets
 		if [ -S "$x" ]; then
-			if type fuser >/dev/null 2>&1; then
+			if command -v fuser >/dev/null 2>&1; then
 				fuser "$x" >/dev/null 2>&1 || rm -- "$x"
 			else
 				rm -- "$x"
@@ -117,19 +117,42 @@ migrate_to_run()
 
 clean_run()
 {
-	[ "$RC_SYS" = VSERVER ] && return 0
+	[ "$RC_SYS" = VSERVER -o "$RC_SYS" = LXC ] && return 0
 	local dir
+	# If / is still read-only due to a problem, this will fail!
+	if ! checkpath -W /; then
+		eerror "/ is not writable; unable to clean up underlying /run"
+		return 1
+	fi
+	if ! checkpath -W /tmp; then
+		eerror "/tmp is not writable; unable to clean up underlying /run"
+		return 1
+	fi
+	# Now we know that we can modify /tmp and /
+	# if mktemp -d fails, it returns an EMPTY string
+	# STDERR: mktemp: failed to create directory via template ‘/tmp/tmp.XXXXXXXXXX’: Read-only file system
+	# STDOUT: ''
+	rc=0
 	dir=$(mktemp -d)
-	mount --bind / $dir
-	rm -rf $dir/run/*
-	umount $dir
-	rm -rf $dir
+	if [ -n "$dir" -a -d $dir -a -w $dir ]; then
+		mount --bind / $dir && rm -rf $dir/run/* || rc=1
+		umount $dir
+		rm -rf $dir
+	else
+		rc=1
+	fi
+	if [ $rc -ne 0 ]; then
+		eerror "Could not clean up underlying /run on /"
+		return 1
+	fi
 }
 
 start()
 {
 	# Remove any added console dirs
-	rm -rf "$RC_LIBEXECDIR"/console/*
+	if checkpath -W "$RC_LIBEXECDIR"; then
+		rm -rf "$RC_LIBEXECDIR"/console/*
+	fi
 
 	local logw=false runw=false extra=
 	# Ensure that our basic dirs exist
@@ -191,10 +214,13 @@ start()
 	if yesno $log_dmesg; then
 		if $logw || checkpath -W /var/log; then
 			# Create an 'after-boot' dmesg log
-			if [ "$RC_SYS" != VSERVER -a "$RC_SYS" != OPENVZ -a "$RC_SYS" != LXC ]; then
-				dmesg > /var/log/dmesg
-				chmod 640 /var/log/dmesg
-			fi
+			case "$RC_SYS" in
+				VSERVER|OPENVZ|LXC|SYSTEMD-NSPAWN) ;;
+				*)
+					dmesg > /var/log/dmesg
+					chmod 640 /var/log/dmesg
+					;;
+			esac
 		fi
 	fi