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init: allow user to override tmpfs root size in fstab in apkovl

fixes http://redmine.alpinelinux.org/issues/show/93

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -318,6 +318,14 @@

 	rc_add savecache shutdown

 fi

+# let user override tmpfs size in fstab in apkovl

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

+	mountopts=$(awk '$2 == "/" && $3 == "tmpfs" { print $4 }' $sysroot/etc/fstab)

+	if [ -n "$mountopts" ]; then

+		mount -o remount,$mountopts $sysroot

+	fi

+fi

+

 # in case we upgrade we might need those:

 rc_add hwdrivers sysinit

 rc_add modloop sysinit