Image files will typically contain lots of null blocks and should compress well.
This will help with distribution of images over slow network links.
Signed-off-by: Paul Barker <p...@paulbarker.me.uk>
---
classes/sdcard_image-rpi.bbclass | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/classes/sdcard_image-rpi.bbclass b/classes/sdcard_image-rpi.bbclass
index a2fcd52..8d2a5f2 100644
--- a/classes/sdcard_image-rpi.bbclass
+++ b/classes/sdcard_image-rpi.bbclass
@@ -50,6 +50,11 @@ IMAGE_DEPENDS_rpi-sdimg = " \
# SD card image name
SDIMG = "${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.rpi-sdimg"
+# Compression method to apply to SDIMG after it has been created. May be
"none",
+# "gzip", "bzip2" or "xz". Setting this to something other than "none" will
+# cause SDIMG to be renamed.
+SDIMG_COMPRESSION ?= "none"
+
# Additional files and/or directories to be copied into the vfat partition
from the IMAGE_ROOTFS.
FATPAYLOAD ?= ""
@@ -107,6 +112,19 @@ IMAGE_CMD_rpi-sdimg () {
else
dd if=${SDIMG_ROOTFS} of=${SDIMG} conv=notrunc seek=1 bs=$(expr
1024 \* ${BOOT_SPACE_ALIGNED} + ${IMAGE_ROOTFS_ALIGNMENT} \* 1024) && sync &&
sync
fi
+
+ # Optionally apply compression
+ case "${SDIMG_COMPRESSION}" in
+ "gzip")
+ gzip -9 "${SDIMG}"
+ ;;
+ "bzip2")
+ bzip2 -9 "${SDIMG}"
+ ;;
+ "xz")
+ xz "${SDIMG}"
+ ;;
+ esac
}
ROOTFS_POSTPROCESS_COMMAND += " rpi_generate_sysctl_config ; "
--
1.8.3.4
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