[build] enable pigz by default (sonic-net#16959)

Why I did it
pigz, which stands for parallel implementation of gzip,
is a fully functional replacement for gzip that exploits multiple processors
and multiple cores to the hilt when compressing data.

We can use it for compression instead of gzip to speed up builds.
It reduces build time (especially at final stage where we compress whole file system).

But solution with special option GZ_COMPRESS_PROGRAM is not good,
because it's hard to maintain (developers need to pass this flag to every script).
I think it's better to remove this option at all and use pigz directly where it's possible.

How I did it
Remove config flag GZ_COMPRESS_PROGRAM
Use pigz directly instead of gzip where it's possible.

How to verify it
I have tested builds with pigz almost 1 year and no issues were detected.
So I think it's better to enable it by default for all builds.
If we found some issues we can always replace pigz with gzip.

Makefile.work

@@ -54,9 +54,6 @@
 #  * ENABLE_BOOTCHART: Enable SONiC bootchart
 #  *                 Default: n
 #  *                 Values: y,n
-#  * GZ_COMPRESS_PROGRAM: Select pigz to reduce build time
-#  *                 Default: gzip
-#  *                 Values: pigz,gzip
 #  * UNATTENDED: Don't wait for interactive input from terminal, setting this
 #  *             value to anything will enable it
 #  *             Default: unset
@@ -157,10 +154,6 @@ ifeq ($(LEGACY_SONIC_MGMT_DOCKER),)
 	override LEGACY_SONIC_MGMT_DOCKER = y
 endif
 
-ifneq ($(GZ_COMPRESS_PROGRAM), pigz)
-override GZ_COMPRESS_PROGRAM = gzip
-endif
-
 ifeq ($(CONFIGURED_ARCH),amd64)
 SLAVE_BASE_IMAGE = $(SLAVE_DIR)
 MULTIARCH_QEMU_ENVIRON = n
@@ -229,7 +222,6 @@ $(shell CONFIGURED_ARCH=$(CONFIGURED_ARCH) \
 	INCLUDE_FIPS=$(INCLUDE_FIPS) \
 	DOCKER_EXTRA_OPTS=$(DOCKER_EXTRA_OPTS) \
 	DEFAULT_CONTAINER_REGISTRY=$(DEFAULT_CONTAINER_REGISTRY) \
-	GZ_COMPRESS_PROGRAM=$(GZ_COMPRESS_PROGRAM) \
 	j2 $(SLAVE_DIR)/Dockerfile.j2 > $(SLAVE_DIR)/Dockerfile)
 
 $(shell CONFIGURED_ARCH=$(CONFIGURED_ARCH) \
@@ -587,7 +579,6 @@ SONIC_BUILD_INSTRUCTION :=  $(MAKE) \
                            SONIC_SLAVE_DOCKER_DRIVER=$(SONIC_SLAVE_DOCKER_DRIVER) \
                            MIRROR_URLS=$(MIRROR_URLS) \
                            MIRROR_SECURITY_URLS=$(MIRROR_SECURITY_URLS) \
-                           GZ_COMPRESS_PROGRAM=$(GZ_COMPRESS_PROGRAM) \
                            MIRROR_SNAPSHOT=$(MIRROR_SNAPSHOT) \
                            SONIC_VERSION_CONTROL_COMPONENTS=$(SONIC_VERSION_CONTROL_COMPONENTS) \
                            ONIE_IMAGE_PART_SIZE=$(ONIE_IMAGE_PART_SIZE) \

build_debian.sh

@@ -150,9 +150,7 @@ else
 fi
 
 ## docker and mkinitramfs on target system will use pigz/unpigz automatically
-if [[ $GZ_COMPRESS_PROGRAM == pigz ]]; then
-    sudo LANG=C chroot $FILESYSTEM_ROOT apt-get -y install pigz
-fi
+sudo LANG=C chroot $FILESYSTEM_ROOT apt-get -y install pigz
 
 ## Install initramfs-tools and linux kernel
 ## Note: initramfs-tools recommends depending on busybox, and we really want busybox for
@@ -879,8 +877,8 @@ if [[ $MULTIARCH_QEMU_ENVIRON == y || $CROSS_BUILD_ENVIRON == y ]]; then
 fi
 
 ## Compress docker files
-pushd $FILESYSTEM_ROOT && sudo tar -I $GZ_COMPRESS_PROGRAM -cf $OLDPWD/$FILESYSTEM_DOCKERFS -C ${DOCKERFS_PATH}var/lib/docker .; popd
+pushd $FILESYSTEM_ROOT && sudo tar -I pigz -cf $OLDPWD/$FILESYSTEM_DOCKERFS -C ${DOCKERFS_PATH}var/lib/docker .; popd
 
 ## Compress together with /boot, /var/lib/docker and $PLATFORM_DIR as an installer payload zip file
-pushd $FILESYSTEM_ROOT && sudo tar -I $GZ_COMPRESS_PROGRAM -cf platform.tar.gz -C $PLATFORM_DIR . && sudo zip -n .gz $OLDPWD/$INSTALLER_PAYLOAD -r boot/ platform.tar.gz; popd
+pushd $FILESYSTEM_ROOT && sudo tar -I pigz -cf platform.tar.gz -C $PLATFORM_DIR . && sudo zip -n .gz $OLDPWD/$INSTALLER_PAYLOAD -r boot/ platform.tar.gz; popd
 sudo zip -g -n .squashfs:.gz $INSTALLER_PAYLOAD $FILESYSTEM_SQUASHFS $FILESYSTEM_DOCKERFS

build_image.sh

@@ -60,10 +60,10 @@ generate_kvm_image()
         exit 1
     }
 
-    $GZ_COMPRESS_PROGRAM $KVM_IMAGE_DISK
+    pigz $KVM_IMAGE_DISK
 
     [ -r $KVM_IMAGE_DISK.gz ] || {
-        echo "Error : $GZ_COMPRESS_PROGRAM $KVM_IMAGE_DISK failed!"
+        echo "Error : pigz $KVM_IMAGE_DISK failed!"
         exit 1
     }
 

rules/config

@@ -307,10 +307,6 @@ ENABLE_FIPS ?= n
 # SONIC_SLAVE_DOCKER_DRIVER - set the sonic slave docker storage driver
 SONIC_SLAVE_DOCKER_DRIVER ?= vfs
 
-# GZ_COMPRESS_PROGRAM - select pigz (a parallel implementation of gzip) to reduce a build time
-# and speed up a decompression of docker images on target system
-GZ_COMPRESS_PROGRAM ?= gzip
-
 # SONIC_OS_VERSION - sonic os version
 SONIC_OS_VERSION ?= 12
 

slave.mk

@@ -92,7 +92,6 @@ export DOCKER_BASE_ARCH
 export CROSS_BUILD_ENVIRON
 export BLDENV
 export BUILD_WORKDIR
-export GZ_COMPRESS_PROGRAM
 export MIRROR_SNAPSHOT
 export SONIC_OS_VERSION
 export FILES_PATH
@@ -461,7 +460,6 @@ ifeq ($(CONFIGURED_PLATFORM),vs)
 $(info "BUILD_MULTIASIC_KVM"             : "$(BUILD_MULTIASIC_KVM)")
 endif
 $(info "CROSS_BUILD_ENVIRON"             : "$(CROSS_BUILD_ENVIRON)")
-$(info "GZ_COMPRESS_PROGRAM"             : "$(GZ_COMPRESS_PROGRAM)")
 $(info "LEGACY_SONIC_MGMT_DOCKER"        : "$(LEGACY_SONIC_MGMT_DOCKER)")
 $(info "INCLUDE_EXTERNAL_PATCHES"        : "$(INCLUDE_EXTERNAL_PATCHES)")
 $(info "PTF_ENV_PY_VER"                  : "$(PTF_ENV_PY_VER)")
@@ -553,7 +551,7 @@ define docker-image-save
     @echo "Tagging docker image $(1)-$(DOCKER_USERNAME):$(DOCKER_USERTAG) as $(1):$(call docker-get-tag,$(1))" $(LOG)
     docker tag $(1)-$(DOCKER_USERNAME):$(DOCKER_USERTAG) $(1):$(call docker-get-tag,$(1)) $(LOG)
     @echo "Saving docker image $(1):$(call docker-get-tag,$(1))" $(LOG)
-        docker save $(1):$(call docker-get-tag,$(1)) | $(GZ_COMPRESS_PROGRAM) -c > $(2)
+        docker save $(1):$(call docker-get-tag,$(1)) | pigz -c > $(2)
     if [ x$(SONIC_CONFIG_USE_NATIVE_DOCKERD_FOR_BUILD) == x"y" ]; then
         @echo "Removing docker image $(1):$(call docker-get-tag,$(1))" $(LOG)
         docker rmi -f $(1):$(call docker-get-tag,$(1)) $(LOG)

sonic-slave-bookworm/Dockerfile.j2

@@ -88,7 +88,8 @@ RUN apt-get update && apt-get install -y \
         curl \
         wget \
         unzip \
-        {{ GZ_COMPRESS_PROGRAM }} \
+        gzip \
+        pigz \
         git \
         build-essential \
         remake \

sonic-slave-bullseye/Dockerfile.j2

@@ -94,7 +94,8 @@ RUN apt-get update && apt-get install -y eatmydata && eatmydata apt-get install
         curl \
         wget \
         unzip \
-        {{ GZ_COMPRESS_PROGRAM }} \
+        gzip \
+        pigz \
         git \
         build-essential \
         remake \

sonic-slave-buster/Dockerfile.j2

@@ -90,7 +90,8 @@ RUN apt-get update && apt-get install -y eatmydata && eatmydata apt-get install
         curl \
         wget \
         unzip \
-        {{ GZ_COMPRESS_PROGRAM }} \
+        gzip \
+        pigz \
         git \
         build-essential \
         remake \

sonic-slave-stretch/Dockerfile.j2

@@ -23,7 +23,8 @@ RUN apt-get update && apt-get install -y \
         curl \
         wget \
         unzip \
-        {{ GZ_COMPRESS_PROGRAM }} \
+        gzip \
+        pigz \
         git \
         build-essential \
         libtool \