[PATCH] image_types: use COMPRESSIONTYPES variable for backward compatibility

[Ed Bartosh <ed.bartosh@linux.intel.com>]

Recent renaming of COMPRESSIONTYPES variable can break recipes that
still use it. Including value of COMPRESSIONTYPES variable into
CONVERSIONTYPES should prevent this.

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
---
 meta/classes/image_types.bbclass | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
index 4d92866..2e852af 100644
--- a/meta/classes/image_types.bbclass
+++ b/meta/classes/image_types.bbclass
@@ -316,7 +316,13 @@ IMAGE_TYPES = " \
     wic wic.gz wic.bz2 wic.lzma \
 "
 
-CONVERSIONTYPES = "gz bz2 lzma xz lz4 zip sum md5sum sha1sum sha224sum sha256sum sha384sum sha512sum bmap"
+# Compression is a special case of conversion. The old variable
+# names are still supported for backward-compatibility. When defining
+# new compression or conversion commands, use CONVERSIONTYPES and
+# CONVERSION_CMD/DEPENDS.
+COMPRESSIONTYPES ?= ""
+
+CONVERSIONTYPES = "gz bz2 lzma xz lz4 zip sum md5sum sha1sum sha224sum sha256sum sha384sum sha512sum bmap ${COMPRESSIONTYPES}"
 CONVERSION_CMD_lzma = "lzma -k -f -7 ${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type}"
 CONVERSION_CMD_gz = "gzip -f -9 -c ${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type} > ${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type}.gz"
 CONVERSION_CMD_bz2 = "pbzip2 -f -k ${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type}"
-- 
2.6.6