Add lzma compression option for `MENDER_COMPRESS_DISK_IMAGE`.

It uses the parallel pxz compression tool.

Changelog: Title

Signed-off-by: Kristian Amlie <kristian.amlie@northern.tech>

Dockerfile

@@ -1,3 +1,14 @@
+# Build pxz in separate image to avoid big image size
+FROM ubuntu:19.04 AS build
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    git \
+    liblzma-dev
+
+# Parallel xz (LZMA) compression
+RUN git clone https://github.com/jnovy/pxz.git /root/pxz
+RUN cd /root/pxz && make
+
 FROM ubuntu:19.04
 
 ARG MENDER_ARTIFACT_VERSION=3.1.0
@@ -30,7 +41,11 @@ RUN apt-get update && apt-get install -y \
 # to get rid of 'sh: 1: udevadm: not found' errors triggered by parted
     udev \
 # to create bmap index file (MENDER_USE_BMAP)
-    bmap-tools
+    bmap-tools \
+# needed to run pxz
+    libgomp1
+
+COPY --from=build /root/pxz/pxz /usr/bin/pxz
 
 RUN wget -q -O /usr/bin/mender-artifact https://d1b0l86ne08fsf.cloudfront.net/mender-artifact/$MENDER_ARTIFACT_VERSION/linux/mender-artifact \
     && chmod +x /usr/bin/mender-artifact

configs/mender_convert_config

@@ -4,12 +4,18 @@
 #
 # NOTE! This file will always be sourced.
 
-# Compress generated disk image using gzip
+# Compress generated disk image
 #
 # This is useful when you have large disk images, compressing them
 # makes it easier to transfer them between e.g an build server and a local
 # machine, and obviously saves space.
-MENDER_COMPRESS_DISK_IMAGE=y
+#
+# Possible values are:
+# 'n'    - No compression
+# 'gzip' - Compress with gzip
+# 'lzma' - Compress with xz (LZMA)
+# 'y'    - Alias for 'gzip'
+MENDER_COMPRESS_DISK_IMAGE=gzip
 
 # Compression algorithm for Mender Artifact
 #

mender-convert-package

@@ -251,10 +251,22 @@ if [ "${MENDER_USE_BMAP}" == "y" ]; then
   run_and_log_cmd "${BMAP_TOOL} create ${sdimg_path} > ${sdimg_path}.bmap"
 fi
 
-if [ "${MENDER_COMPRESS_DISK_IMAGE}" == "y" ]; then
-  log_info "Compressing ${sdimg_path}.gz"
-  run_and_log_cmd "pigz --best --force ${sdimg_path}"
-fi
+case "${MENDER_COMPRESS_DISK_IMAGE}" in
+  y | gzip)
+    log_info "Compressing ${sdimg_path}.gz"
+    run_and_log_cmd "pigz --best --force ${sdimg_path}"
+    ;;
+  lzma)
+    log_info "Compressing ${sdimg_path}.xz"
+    run_and_log_cmd "pxz --best --force ${sdimg_path}"
+    ;;
+  n)
+    :
+    ;;
+  *)
+    log_fatal "Unknown MENDER_COMPRESS_DISK_IMAGE value: ${MENDER_COMPRESS_DISK_IMAGE}"
+    ;;
+esac
 
 log_info "Conversion has completed! \o/"