[Buildroot] [PATCH] support: Allow compression of sdcard.img

[Evgeniy Didin <Evgeniy.Didin@synopsys.com>]

In image files, generated by genimage.sh, there
are tens of megabytes most of which might be filled
with zeros as partitions are made a bit larger than
needed for minimalictic rootfs (which allows users to
add more libs and aps later on without messign with
partition sizes).

So adding an option for genimage.sh script, setting which
we gzip image file and greatly reduce it size.

Signed-off-by: Evgeniy Didin <didin@synopsys.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Cc: arc-buildroot at synopsys.com
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 support/scripts/genimage.sh | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/support/scripts/genimage.sh b/support/scripts/genimage.sh
index 039b3fef1d..fa00e12855 100755
--- a/support/scripts/genimage.sh
+++ b/support/scripts/genimage.sh
@@ -1,16 +1,17 @@
 #!/usr/bin/env bash
+# -g option gzips IMAGE_FILE to reduce it size
 
 die() {
   cat <<EOF >&2
 Error: $@
 
-Usage: ${0} -c GENIMAGE_CONFIG_FILE
+Usage: ${0} -c GENIMAGE_CONFIG_FILE -g IMAGE_FILE
 EOF
   exit 1
 }
 
 # Parse arguments and put into argument list of the script
-opts="$(getopt -n "${0##*/}" -o c: -- "$@")" || exit $?
+opts="$(getopt -n "${0##*/}" -o c:g: -- "$@")" || exit $?
 eval set -- "$opts"
 
 GENIMAGE_TMP="${BUILD_DIR}/genimage.tmp"
@@ -23,6 +24,9 @@ while true ; do
 	--) # Discard all non-option parameters
 	  shift 1;
 	  break ;;
+        -g)
+	  GENIMAGE_NAME="${2}";
+          shift 2;;
 	*)
 	  die "unknown option '${1}'" ;;
 	esac
@@ -38,3 +42,8 @@ genimage \
 	--inputpath "${BINARIES_DIR}"  \
 	--outputpath "${BINARIES_DIR}" \
 	--config "${GENIMAGE_CFG}"
+if [ ${GENIMAGE_NAME} ]
+then
+echo ${GENIMAGE_NAME}
+gzip < ${BINARIES_DIR}/${GENIMAGE_NAME} > ${BINARIES_DIR}/${GENIMAGE_NAME}.gz
+fi
-- 
2.11.0