Bug #414581: ensure built-in initramfs compress config options are set to avoid silentoldconfig bailing out.

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>

ChangeLog

@@ -5,6 +5,10 @@
 # Distributed under the GPL v2
 # $Id$
 
+  13 Oct 2012; Robin H. Johnson <robbat2@gentoo.org> gen_initramfs.sh:
+  Bug #414581: ensure built-in initramfs compress config options are set to
+  avoid silentoldconfig bailing out.
+
   13 Oct 2012; Łukasz Stelmach <stlman@poczta.fm> gen_cmdline.sh,
   gen_compile.sh, gen_configkernel.sh, gen_determineargs.sh, gen_funcs.sh,
   genkernel:

gen_initramfs.sh

@@ -802,10 +802,28 @@ create_initramfs() {
 		# The kernel will do a better job of it than us.
 		mv ${TMPDIR}/initramfs-${KV} ${TMPDIR}/initramfs-${KV}.cpio
 		sed -i '/^.*CONFIG_INITRAMFS_SOURCE=.*$/d' ${KERNEL_DIR}/.config
+		compress_config='INITRAMFS_COMPRESSION_NONE'
+		case ${compress_ext} in
+			gz)  compress_config='INITRAMFS_COMPRESSION_GZIP' ;;
+			bz2) compress_config='INITRAMFS_COMPRESSION_BZIP2' ;;
+			lzma) compress_config='INITRAMFS_COMPRESSION_LZMA' ;;
+			xz) compress_config='INITRAMFS_COMPRESSION_XZ' ;;
+			lzo) compress_config='INITRAMFS_COMPRESSION_LZO' ;;
+			*) compress_config='INITRAMFS_COMPRESSION_NONE' ;;
+		esac
+		# All N default except XZ, so there it gets used if the kernel does
+		# compression on it's own.
 		cat >>${KERNEL_DIR}/.config	<<-EOF
 		CONFIG_INITRAMFS_SOURCE="${TMPDIR}/initramfs-${KV}.cpio${compress_ext}"
 		CONFIG_INITRAMFS_ROOT_UID=0
 		CONFIG_INITRAMFS_ROOT_GID=0
+		CONFIG_INITRAMFS_COMPRESSION_NONE=n
+		CONFIG_INITRAMFS_COMPRESSION_GZIP=n
+		CONFIG_INITRAMFS_COMPRESSION_BZIP2=n
+		CONFIG_INITRAMFS_COMPRESSION_LZMA=n
+		CONFIG_INITRAMFS_COMPRESSION_XZ=y
+		CONFIG_INITRAMFS_COMPRESSION_LZO=n
+		CONFIG_${compress_config}=y
 		EOF
 	else
 		if isTrue "${COMPRESS_INITRD}"