[Buildroot] [[Next]RFC] sdk-docker: new make target using Dockcross

[Buildroot] [[Next]RFC] sdk-docker: new make target using Dockcross

[Matt Weber]

This patch adds a new make target for building a Docker with
an SDK installed. This patch has not been broken up and is for
RFC only to get feedback on the technical approach.

 - `make sdk-docker` first sets up the dockcross package and
   the environment-setup script to stage the environment.

 - The dockcross package in Buildroot includes a folder with
   a custom Dockerfile and pre-exec setup scripts which are
   copied into the dockcross build folder at configure time.
   This Dockerfile uses the Buildroot base and sets up other
   tools to allow a project to completely execute a build flow
   with make / cmake / meson / scons.

 - Within the Dockcross package, the entrypoint and sudo
   scripting are reused but a new standard image/custom image
   is not defined.  Instead this patchset duplicates the
   docker build step in the Buildroot top-level Makefile.
   The entrypoint / sudo scripting were reused because it
   handles seamless mapping of the calling user into the
   container for the build and back with all the files uid/gid
   intacted.

 - One of the best advantages of this environment is the
   fact it resets on each new lauch and is clean for a new
   build.  I.e. just the PWD which is mapped as /work inside
   is maintained after the container tears down.

 - I'm unsure if it makes sense to use dockcross or just pull
   over the concepts they use into Buildroot directly....
   I think I found a good balance considering each Buildroot
   defconfig build is unique so it doesn't seem like there is
   a chance to upstream a Buildroot configuration to dockcross.

 - TODO: Add a manual section that includes usage notes

 - How to test
   make qemu_aarch64_virt_defconfig
   make sdk-docker
   # Usage from https://github.com/dockcross/dockcross
   # Setup container launch script
   docker run --rm dockcross/buildroot-sdk-aarch64-buildroot-linux-gnu  > ./dockcross
   # This dockcross script maps the pwd into the container as /work
   # as well as the current users $HOME as $HOME inside.
   # Executing the script to dump the env, should list all the
   # environment-setup exported values for use
   ./dockcross bash -c 'export'
   # Check that the cross toolchain executes
   ./dockcross bash -c '$CC -version'

Signed-off-by: Matt Weber <matt@thewebers.ws>
---
 Makefile                                  | 16 +++++
 docs/manual/using-buildroot-toolchain.txt |  2 +
 package/dockcross/buildroot/Dockerfile    | 88 +++++++++++++++++++++++
 package/dockcross/buildroot/pre_exec.sh   |  9 +++
 package/dockcross/dockcross.hash          |  3 +
 package/dockcross/dockcross.mk            | 24 +++++++
 6 files changed, 142 insertions(+)
 create mode 100644 package/dockcross/buildroot/Dockerfile
 create mode 100644 package/dockcross/buildroot/pre_exec.sh
 create mode 100644 package/dockcross/dockcross.hash
 create mode 100644 package/dockcross/dockcross.mk

diff --git a/Makefile b/Makefile
index 14e10223ed..f3a37dff26 100644
--- a/Makefile
+++ b/Makefile
@@ -617,6 +617,21 @@ sdk: prepare-sdk $(BR2_TAR_HOST_DEPENDENCY)
 		--transform='s#^$(patsubst /%,%,$(HOST_DIR))#$(BR2_SDK_PREFIX)#' \
 		-C / $(patsubst /%,%,$(HOST_DIR))
 
+.PHONY: sdk-docker
+sdk-docker: sdk host-dockcross host-environment-setup
+	@$(call MESSAGE,"Generating SDK Docker image")
+	cd $(HOST_DOCKCROSS_SRCDIR) && \
+	cp -a "$(BINARIES_DIR)/$(BR2_SDK_PREFIX).tar.gz" buildroot/ && \
+	docker build -t dockcross/buildroot-sdk-$(GNU_TARGET_NAME):latest \
+		--build-arg BUILDROOT_SDK_FILE=$(BR2_SDK_PREFIX).tar.gz \
+		--build-arg IMAGE=dockcross/buildroot-sdk-$(GNU_TARGET_NAME) \
+		--build-arg VCS_REF=`git -C $(TOPDIR) rev-parse --short HEAD` \
+		--build-arg VCS_URL=`git -C $(TOPDIR) config --get remote.origin.url` \
+		--build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
+		-f buildroot/Dockerfile .
+	docker save dockcross/buildroot-sdk-$(GNU_TARGET_NAME):latest | \
+		gzip > $(BINARIES_DIR)/$(BR2_SDK_PREFIX)_docker.tar.gz
+
 RSYNC_VCS_EXCLUSIONS = \
 	--exclude .svn --exclude .git --exclude .hg --exclude .bzr \
 	--exclude CVS
@@ -1099,6 +1114,7 @@ help:
 	@echo '  all                    - make world'
 	@echo '  toolchain              - build toolchain'
 	@echo '  sdk                    - build relocatable SDK'
+	@echo '  sdk-docker             - build a Docker for SDK Deployment'
 	@echo
 	@echo 'Configuration:'
 	@echo '  menuconfig             - interactive curses-based configurator'
diff --git a/docs/manual/using-buildroot-toolchain.txt b/docs/manual/using-buildroot-toolchain.txt
index 09408ef05a..017e2df496 100644
--- a/docs/manual/using-buildroot-toolchain.txt
+++ b/docs/manual/using-buildroot-toolchain.txt
@@ -46,3 +46,5 @@ cross-compile _autotools_ projects. It also provides some useful
 commands. Note however that once this script is sourced, the
 environment is setup only for cross-compilation, and no longer for
 native compilation.
+
+Docker notes??
diff --git a/package/dockcross/buildroot/Dockerfile b/package/dockcross/buildroot/Dockerfile
new file mode 100644
index 0000000000..3c7a2ed522
--- /dev/null
+++ b/package/dockcross/buildroot/Dockerfile
@@ -0,0 +1,88 @@
+##############################################
+##############################################
+FROM buildroot/base:20200814.2228
+# Revert defaults of the buildroot/base
+USER 0
+ENV HOME /root
+RUN echo "root:root" | chpasswd
+RUN deluser br-user && rm -rf /home/br-user
+WORKDIR /work
+##############################################
+##############################################
+
+##############################################
+##############################################
+# Add dev environment extras
+RUN apt-get update && apt-get install -y \
+	curl gpg git-email openssl vim scons meson \
+	squashfs-tools 
+##############################################
+##############################################
+
+##############################################
+##############################################
+# Add in common.dockcross features for handling
+# current user transparency
+COPY \
+  imagefiles/install-gosu-binary.sh \
+  imagefiles/install-gosu-binary-wrapper.sh \
+  /buildscripts/
+RUN \
+  set -x && \
+  /buildscripts/install-gosu-binary.sh && \
+  /buildscripts/install-gosu-binary-wrapper.sh && \
+  rm -rf /buildscripts
+COPY imagefiles/entrypoint.sh imagefiles/dockcross /dockcross/
+ENTRYPOINT ["/dockcross/entrypoint.sh"]
+##############################################
+##############################################
+
+##############################################
+##############################################
+# Setup the Buildroot SDK
+#
+# This Dockerfile can be called from within the
+# host-dockcross folder but a path has to be
+# set to the sdk tarball like the TOPDIR/Makefile
+# target does.
+#
+ARG BUILDROOT_SDK_FILE
+RUN test -n "$BUILDROOT_SDK_FILE"
+ENV CROSS_SDK_FILE $BUILDROOT_SDK_FILE
+ENV CROSS_ROOT /opt/toolchain
+COPY buildroot/${CROSS_SDK_FILE} /opt
+RUN cd /opt && \
+    mkdir -p ${CROSS_ROOT} && \
+    tar xf ${CROSS_SDK_FILE} -C ${CROSS_ROOT} \
+	--strip-components=1 && \
+    rm ${CROSS_SDK_FILE} && \
+    cd ${CROSS_ROOT} && \
+    ./relocate-sdk.sh && \
+    cd / && \
+    find ${CROSS_ROOT} -xtype l ! -exec test -e {} \; -delete && \
+    find ${CROSS_ROOT} -exec chmod a+r '{}' \; && \
+    find ${CROSS_ROOT} -executable -exec chmod a+x '{}' \;
+
+# Place fixups file that's exec by entrypoint.sh before the <command>
+# in ./dockcross bash -c '<command>'
+COPY buildroot/pre_exec.sh /dockcross
+RUN chmod 777 /dockcross/pre_exec.sh
+# Forces the /etc/profile.d to be sourced and pickup script(s) staged
+# by pre_exec.sh
+ENV BASH_ENV=/etc/profile
+##############################################
+##############################################
+
+# Build-time metadata as defined at http://label-schema.org
+ARG BUILD_DATE
+ARG IMAGE=dockcross/buildroot
+ARG VERSION=latest
+ARG VCS_REF
+ARG VCS_URL
+LABEL org.label-schema.build-date=$BUILD_DATE \
+      org.label-schema.name=$IMAGE \
+      org.label-schema.version=$VERSION \
+      org.label-schema.vcs-ref=$VCS_REF \
+      org.label-schema.vcs-url=$VCS_URL \
+      org.label-schema.schema-version="1.0"
+ENV DEFAULT_DOCKCROSS_IMAGE ${IMAGE}:${VERSION}
diff --git a/package/dockcross/buildroot/pre_exec.sh b/package/dockcross/buildroot/pre_exec.sh
new file mode 100644
index 0000000000..86a71c67a9
--- /dev/null
+++ b/package/dockcross/buildroot/pre_exec.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+if [ -e "/opt/toolchain/environment-setup" ]; then
+	echo "#!/bin/bash" > /etc/profile.d/setup-buildroot-shell.sh
+	echo "cd /opt/toolchain" >> /etc/profile.d/setup-buildroot-shell.sh
+	echo "source ./environment-setup" >> /etc/profile.d/setup-buildroot-shell.sh
+	chmod 777 /etc/profile.d/setup-buildroot-shell.sh
+fi
+
diff --git a/package/dockcross/dockcross.hash b/package/dockcross/dockcross.hash
new file mode 100644
index 0000000000..5058089e85
--- /dev/null
+++ b/package/dockcross/dockcross.hash
@@ -0,0 +1,3 @@
+# Locally calculated
+sha256  db0fcc1146a7442531512fa7648e634aca223a067bdc6e23f6d4b2b26b055fe2  dockcross-541794d41d04b9b3e9173d1368a8f43d38c9419c.tar.gz
+sha256  4e037c6b9506ca72dd076686468c0761adda7fb0e102e3bd6eb41650a4193f38  LICENSE
diff --git a/package/dockcross/dockcross.mk b/package/dockcross/dockcross.mk
new file mode 100644
index 0000000000..dc5c6eb44b
--- /dev/null
+++ b/package/dockcross/dockcross.mk
@@ -0,0 +1,24 @@
+################################################################################
+#
+# dockcross
+#
+################################################################################
+
+DOCKCROSS_VERSION = 541794d41d04b9b3e9173d1368a8f43d38c9419c
+DOCKCROSS_SITE = $(call github,dockcross,dockcross,$(DOCKCROSS_VERSION))
+DOCKCROSS_LICENSE = MIT
+DOCKCROSS_LICENSE_FILES = LICENSE
+
+define HOST_DOCKCROSS_CONFIGURE_CMDS
+	cp $(TOPDIR)/package/dockcross/buildroot $(@D)/ -a
+	
+	@id -nG ${USER} | grep -qw docker || exit 1
+	#	echo -e "\n\n# Check if Docker is installed \n \
+	#		which docker \n \
+	#		# Add your non-root user to the Docker group \
+	##		(Requires you to logout for it to take affect) \n \
+	#	sudo usermod -a -G docker ${USER} \n\n" && \
+	#	exit 1
+endef
+
+$(eval $(host-generic-package))
-- 
2.25.1

Re: [Buildroot] [[Next]RFC] sdk-docker: new make target using Dockcross

[Joachim Wiberg]

Hi,

sorry for the late review:

On Sun, Feb 14, 2021 at 23:32, Matt Weber <matt@thewebers.ws> wrote:
> This patch adds a new make target for building a Docker with
> an SDK installed. This patch has not been broken up and is for
> RFC only to get feedback on the technical approach.
>
>  - `make sdk-docker` first sets up the dockcross package and
>    the environment-setup script to stage the environment.
>
>  - The dockcross package in Buildroot includes a folder with
>    a custom Dockerfile and pre-exec setup scripts which are
>    copied into the dockcross build folder at configure time.
>    This Dockerfile uses the Buildroot base and sets up other
>    tools to allow a project to completely execute a build flow
>    with make / cmake / meson / scons.
>
>  - Within the Dockcross package, the entrypoint and sudo
>    scripting are reused but a new standard image/custom image
>    is not defined.  Instead this patchset duplicates the
>    docker build step in the Buildroot top-level Makefile.
>    The entrypoint / sudo scripting were reused because it
>    handles seamless mapping of the calling user into the
>    container for the build and back with all the files uid/gid
>    intacted.
>
>  - One of the best advantages of this environment is the
>    fact it resets on each new lauch and is clean for a new
>    build.  I.e. just the PWD which is mapped as /work inside
>    is maintained after the container tears down.
>
>  - I'm unsure if it makes sense to use dockcross or just pull
>    over the concepts they use into Buildroot directly....
>    I think I found a good balance considering each Buildroot
>    defconfig build is unique so it doesn't seem like there is
>    a chance to upstream a Buildroot configuration to dockcross.
>
>  - TODO: Add a manual section that includes usage notes
>
>  - How to test
>    make qemu_aarch64_virt_defconfig
>    make sdk-docker
>    # Usage from https://github.com/dockcross/dockcross
>    # Setup container launch script
>    docker run --rm dockcross/buildroot-sdk-aarch64-buildroot-linux-gnu  > ./dockcross
>    # This dockcross script maps the pwd into the container as /work
>    # as well as the current users $HOME as $HOME inside.
>    # Executing the script to dump the env, should list all the
>    # environment-setup exported values for use
>    ./dockcross bash -c 'export'
>    # Check that the cross toolchain executes
>    ./dockcross bash -c '$CC -version'
>
> Signed-off-by: Matt Weber <matt@thewebers.ws>

This looks *really* interesting!  At $DAYJOB we currently have locally
maintained docker containers to get reproducible build environments on
developer laptops.  Having it integrated in Buildroot would be great!

I've tested your patch using latest Buildroot and qemu_x86_64_defconfig
but it failed with the following, which turned out to be a too old
buildroot/base.  When I bumped to 20211120.1925 it worked fine.  Turns
out GitHub dropped insecure cryptos last summer and the old Debian base
had a bit too old curl:

Downloading https://github.com/tianon/gosu/releases/download/1.10/gosu-amd64
######################################################################## 100.0%
curl: (35) Unknown SSL protocol error in connection to objects.githubusercontent.com:443 
The command '/bin/sh -c set -x &&   /buildscripts/install-gosu-binary.sh &&   /buildscripts/install-gosu-binary-wrapper.sh &&   rm -rf /buildscripts' returned a non-zero code: 35
make[1]: *** [Makefile:629: sdk-docker] Error 35

Only two things that stick out to me are:

 1. might need to have some small check in the top Makefile to verify
    that 'docker' is available on the host system -- maybe obvious to
    experienced users, but it would help reduce the support burden for
    the mailing list, I think
 2. the dockcross project apparently doesn't do releases, or even tags,
    so it might be a bit of a hassle to track changes and do updates?
    Maybe we could reach out to them and ask for tags, at least

Can't give better technical feedback than that, maybe Mr Petazzoni can
chime in here wrt the actual integration.

Reviewed-by: Joachim Wiberg <troglobit@gmail.com>

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Re: [Buildroot] [[Next]RFC] sdk-docker: new make target using Dockcross

[Romain Naour]

Hello Matt,

Le 15/02/2021 à 06:32, Matt Weber a écrit :
> This patch adds a new make target for building a Docker with
> an SDK installed. This patch has not been broken up and is for
> RFC only to get feedback on the technical approach.
> 
>  - `make sdk-docker` first sets up the dockcross package and
>    the environment-setup script to stage the environment.
> 
>  - The dockcross package in Buildroot includes a folder with
>    a custom Dockerfile and pre-exec setup scripts which are
>    copied into the dockcross build folder at configure time.
>    This Dockerfile uses the Buildroot base and sets up other
>    tools to allow a project to completely execute a build flow
>    with make / cmake / meson / scons.

Usually meson, scons and sometime cmake are provided by Buildroot as host
package. The Buildroot SDK rely on Buildroot provided host build tools.

> 
>  - Within the Dockcross package, the entrypoint and sudo
>    scripting are reused but a new standard image/custom image
>    is not defined.

It seems that label-schema (rc1) is deprecated in favour of oci image spec :

http://label-schema.org/rc1/

>    Instead this patchset duplicates the
>    docker build step in the Buildroot top-level Makefile.
>    The entrypoint / sudo scripting were reused because it
>    handles seamless mapping of the calling user into the
>    container for the build and back with all the files uid/gid
>    intacted.
> 
>  - One of the best advantages of this environment is the
>    fact it resets on each new lauch and is clean for a new
>    build.  I.e. just the PWD which is mapped as /work inside
>    is maintained after the container tears down.
> 
>  - I'm unsure if it makes sense to use dockcross or just pull
>    over the concepts they use into Buildroot directly....

I'm not sure either. dockcross provide a cross-toolchain along with build tools
but without target libraries. Here you extend dockcross with the Buildroot SDK
(cross-toolchain + staging that contains target libraries selected in the
Buildroot configuration used to generate the SDK).

Maybe we need a new name but "buildrootcross" is already a pleonasm :)

>    I think I found a good balance considering each Buildroot
>    defconfig build is unique so it doesn't seem like there is
>    a chance to upstream a Buildroot configuration to dockcross.
> 
>  - TODO: Add a manual section that includes usage notes
> 
>  - How to test
>    make qemu_aarch64_virt_defconfig
>    make sdk-docker
>    # Usage from https://github.com/dockcross/dockcross
>    # Setup container launch script
>    docker run --rm dockcross/buildroot-sdk-aarch64-buildroot-linux-gnu  > ./dockcross
>    # This dockcross script maps the pwd into the container as /work
>    # as well as the current users $HOME as $HOME inside.
>    # Executing the script to dump the env, should list all the
>    # environment-setup exported values for use
>    ./dockcross bash -c 'export'
>    # Check that the cross toolchain executes
>    ./dockcross bash -c '$CC -version'
> 
> Signed-off-by: Matt Weber <matt@thewebers.ws>
> ---
>  Makefile                                  | 16 +++++
>  docs/manual/using-buildroot-toolchain.txt |  2 +
>  package/dockcross/buildroot/Dockerfile    | 88 +++++++++++++++++++++++
>  package/dockcross/buildroot/pre_exec.sh   |  9 +++
>  package/dockcross/dockcross.hash          |  3 +
>  package/dockcross/dockcross.mk            | 24 +++++++
>  6 files changed, 142 insertions(+)
>  create mode 100644 package/dockcross/buildroot/Dockerfile
>  create mode 100644 package/dockcross/buildroot/pre_exec.sh
>  create mode 100644 package/dockcross/dockcross.hash
>  create mode 100644 package/dockcross/dockcross.mk
> 
> diff --git a/Makefile b/Makefile
> index 14e10223ed..f3a37dff26 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -617,6 +617,21 @@ sdk: prepare-sdk $(BR2_TAR_HOST_DEPENDENCY)
>  		--transform='s#^$(patsubst /%,%,$(HOST_DIR))#$(BR2_SDK_PREFIX)#' \
>  		-C / $(patsubst /%,%,$(HOST_DIR))
>  
> +.PHONY: sdk-docker
> +sdk-docker: sdk host-dockcross host-environment-setup
> +	@$(call MESSAGE,"Generating SDK Docker image")
> +	cd $(HOST_DOCKCROSS_SRCDIR) && \
> +	cp -a "$(BINARIES_DIR)/$(BR2_SDK_PREFIX).tar.gz" buildroot/ && \
> +	docker build -t dockcross/buildroot-sdk-$(GNU_TARGET_NAME):latest \

I would use an unique tag here instead using latest.

> +		--build-arg BUILDROOT_SDK_FILE=$(BR2_SDK_PREFIX).tar.gz \
> +		--build-arg IMAGE=dockcross/buildroot-sdk-$(GNU_TARGET_NAME) \
> +		--build-arg VCS_REF=`git -C $(TOPDIR) rev-parse --short HEAD` \
> +		--build-arg VCS_URL=`git -C $(TOPDIR) config --get remote.origin.url` \

Using git here requires running sdk-docker from a Buildroot git repository. It
will not work from a release archive.

> +		--build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
> +		-f buildroot/Dockerfile .
> +	docker save dockcross/buildroot-sdk-$(GNU_TARGET_NAME):latest | \
> +		gzip > $(BINARIES_DIR)/$(BR2_SDK_PREFIX)_docker.tar.gz
> +
>  RSYNC_VCS_EXCLUSIONS = \
>  	--exclude .svn --exclude .git --exclude .hg --exclude .bzr \
>  	--exclude CVS
> @@ -1099,6 +1114,7 @@ help:
>  	@echo '  all                    - make world'
>  	@echo '  toolchain              - build toolchain'
>  	@echo '  sdk                    - build relocatable SDK'
> +	@echo '  sdk-docker             - build a Docker for SDK Deployment'
>  	@echo
>  	@echo 'Configuration:'
>  	@echo '  menuconfig             - interactive curses-based configurator'
> diff --git a/docs/manual/using-buildroot-toolchain.txt b/docs/manual/using-buildroot-toolchain.txt
> index 09408ef05a..017e2df496 100644
> --- a/docs/manual/using-buildroot-toolchain.txt
> +++ b/docs/manual/using-buildroot-toolchain.txt
> @@ -46,3 +46,5 @@ cross-compile _autotools_ projects. It also provides some useful
>  commands. Note however that once this script is sourced, the
>  environment is setup only for cross-compilation, and no longer for
>  native compilation.
> +
> +Docker notes??
> diff --git a/package/dockcross/buildroot/Dockerfile b/package/dockcross/buildroot/Dockerfile
> new file mode 100644
> index 0000000000..3c7a2ed522
> --- /dev/null
> +++ b/package/dockcross/buildroot/Dockerfile
> @@ -0,0 +1,88 @@
> +##############################################
> +##############################################
> +FROM buildroot/base:20200814.2228
> +# Revert defaults of the buildroot/base
> +USER 0
> +ENV HOME /root
> +RUN echo "root:root" | chpasswd
> +RUN deluser br-user && rm -rf /home/br-user

For the final version of sdk-docker, we should avoid using the Buildroot/base
image but building a new image from Debian docker image is slow.


> +WORKDIR /work
> +##############################################
> +##############################################
> +
> +##############################################
> +##############################################
> +# Add dev environment extras
> +RUN apt-get update && apt-get install -y \
> +	curl gpg git-email openssl vim scons meson \
> +	squashfs-tools 

I'm not sure why we need to install more package here, scons meson etc should be
provided by Buildroot SDK already.

Why git-email ?

> +##############################################
> +##############################################
> +
> +##############################################
> +##############################################
> +# Add in common.dockcross features for handling
> +# current user transparency
> +COPY \
> +  imagefiles/install-gosu-binary.sh \
> +  imagefiles/install-gosu-binary-wrapper.sh \
> +  /buildscripts/
> +RUN \
> +  set -x && \
> +  /buildscripts/install-gosu-binary.sh && \
> +  /buildscripts/install-gosu-binary-wrapper.sh && \
> +  rm -rf /buildscripts
> +COPY imagefiles/entrypoint.sh imagefiles/dockcross /dockcross/
> +ENTRYPOINT ["/dockcross/entrypoint.sh"]

Ok, we needs curl and gpg installed to use these scripts.

But gosu package is now available in Debian since buster:

https://repology.org/project/gosu/versions

Running these script should not be necessary anymore.

> +##############################################
> +##############################################
> +
> +##############################################
> +##############################################
> +# Setup the Buildroot SDK
> +#
> +# This Dockerfile can be called from within the
> +# host-dockcross folder but a path has to be
> +# set to the sdk tarball like the TOPDIR/Makefile
> +# target does.
> +#
> +ARG BUILDROOT_SDK_FILE
> +RUN test -n "$BUILDROOT_SDK_FILE"
> +ENV CROSS_SDK_FILE $BUILDROOT_SDK_FILE
> +ENV CROSS_ROOT /opt/toolchain
> +COPY buildroot/${CROSS_SDK_FILE} /opt
> +RUN cd /opt && \
> +    mkdir -p ${CROSS_ROOT} && \
> +    tar xf ${CROSS_SDK_FILE} -C ${CROSS_ROOT} \
> +	--strip-components=1 && \
> +    rm ${CROSS_SDK_FILE} && \
> +    cd ${CROSS_ROOT} && \
> +    ./relocate-sdk.sh && \
> +    cd / && \
> +    find ${CROSS_ROOT} -xtype l ! -exec test -e {} \; -delete && \
> +    find ${CROSS_ROOT} -exec chmod a+r '{}' \; && \
> +    find ${CROSS_ROOT} -executable -exec chmod a+x '{}' \;

Maybe a comment here should help to underdant why these three find command are
needed.

> +
> +# Place fixups file that's exec by entrypoint.sh before the <command>
> +# in ./dockcross bash -c '<command>'
> +COPY buildroot/pre_exec.sh /dockcross
> +RUN chmod 777 /dockcross/pre_exec.sh
> +# Forces the /etc/profile.d to be sourced and pickup script(s) staged
> +# by pre_exec.sh
> +ENV BASH_ENV=/etc/profile
> +##############################################
> +##############################################
> +
> +# Build-time metadata as defined at http://label-schema.org
> +ARG BUILD_DATE
> +ARG IMAGE=dockcross/buildroot
> +ARG VERSION=latest
> +ARG VCS_REF
> +ARG VCS_URL
> +LABEL org.label-schema.build-date=$BUILD_DATE \
> +      org.label-schema.name=$IMAGE \
> +      org.label-schema.version=$VERSION \
> +      org.label-schema.vcs-ref=$VCS_REF \
> +      org.label-schema.vcs-url=$VCS_URL \
> +      org.label-schema.schema-version="1.0"
> +ENV DEFAULT_DOCKCROSS_IMAGE ${IMAGE}:${VERSION}
> diff --git a/package/dockcross/buildroot/pre_exec.sh b/package/dockcross/buildroot/pre_exec.sh
> new file mode 100644
> index 0000000000..86a71c67a9
> --- /dev/null
> +++ b/package/dockcross/buildroot/pre_exec.sh
> @@ -0,0 +1,9 @@
> +#!/bin/bash
> +
> +if [ -e "/opt/toolchain/environment-setup" ]; then
> +	echo "#!/bin/bash" > /etc/profile.d/setup-buildroot-shell.sh
> +	echo "cd /opt/toolchain" >> /etc/profile.d/setup-buildroot-shell.sh
> +	echo "source ./environment-setup" >> /etc/profile.d/setup-buildroot-shell.sh
> +	chmod 777 /etc/profile.d/setup-buildroot-shell.sh
> +fi
> +
> diff --git a/package/dockcross/dockcross.hash b/package/dockcross/dockcross.hash
> new file mode 100644
> index 0000000000..5058089e85
> --- /dev/null
> +++ b/package/dockcross/dockcross.hash
> @@ -0,0 +1,3 @@
> +# Locally calculated
> +sha256  db0fcc1146a7442531512fa7648e634aca223a067bdc6e23f6d4b2b26b055fe2  dockcross-541794d41d04b9b3e9173d1368a8f43d38c9419c.tar.gz
> +sha256  4e037c6b9506ca72dd076686468c0761adda7fb0e102e3bd6eb41650a4193f38  LICENSE
> diff --git a/package/dockcross/dockcross.mk b/package/dockcross/dockcross.mk
> new file mode 100644
> index 0000000000..dc5c6eb44b
> --- /dev/null
> +++ b/package/dockcross/dockcross.mk
> @@ -0,0 +1,24 @@
> +################################################################################
> +#
> +# dockcross
> +#
> +################################################################################
> +
> +DOCKCROSS_VERSION = 541794d41d04b9b3e9173d1368a8f43d38c9419c
> +DOCKCROSS_SITE = $(call github,dockcross,dockcross,$(DOCKCROSS_VERSION))
> +DOCKCROSS_LICENSE = MIT
> +DOCKCROSS_LICENSE_FILES = LICENSE
> +
> +define HOST_DOCKCROSS_CONFIGURE_CMDS
> +	cp $(TOPDIR)/package/dockcross/buildroot $(@D)/ -a

The copy should belong to HOST_DOCKCROSS_EXTRACT_CMDS step IMHO.

> +	
> +	@id -nG ${USER} | grep -qw docker || exit 1

This check is done too late (after generating the sdk), usually such check
should be done early as possible.

Best regards,
Romain


> +	#	echo -e "\n\n# Check if Docker is installed \n \
> +	#		which docker \n \
> +	#		# Add your non-root user to the Docker group \
> +	##		(Requires you to logout for it to take affect) \n \
> +	#	sudo usermod -a -G docker ${USER} \n\n" && \
> +	#	exit 1
> +endef
> +
> +$(eval $(host-generic-package))

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