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This meta layer adds support for snapd and snaps for all OpenEmbedded/Yocto based devices.
This meta layer mainly contains the following components which are required for supporting snaps in your system:
- snapd
The layer follows Yocto master branch.
The following layers are required:
- meta-openembedded/meta-oe
- meta-openembedded/meta-networking
- meta-openembedded/meta-perl
- meta-openembedded/meta-pythoin
- meta-openembedded/meta-filesystems
- meta-security
-
Follow the Yocto Quickstart guide to get your build host properly setup: https://www.yoctoproject.org/docs/latest/yocto-project-qs/yocto-project-qs.html
-
Download latest yocto release
$ git clone git://git.yoctoproject.org/poky
$ cd poky
- Fetch meta-openembedded layer:
$ git clone git://git.openembedded.org/meta-openembedded
- Fetch meta-security layer:
$ git clone git://git.yoctoproject.org/meta-security
- Fetch meta-snapd layer
$ git clone https://github.com/snapcore/meta-snapd.git
- Prepare the build environment
$ source oe-init-build-env
Now add meta-snapd to your conf/bblayers.conf so that it looks similar to this
BBLAYERS ?= " \
...
/tmp/poky/meta-snapd \
/tmp/meta-openembedded/meta-oe \
/tmp/meta-openembedded/meta-networking \
/tmp/meta-openembedded/meta-perl \
/tmp/meta-openembedded/meta-python \
/tmp/meta-openembedded/meta-filesystems \
/tmp/meta-openembedded/meta-security \
"
- Modify your conf/local.conf
Enable support for systemd which is mandatory for snapd. See https://www.yoctoproject.org/docs/latest/dev-manual/dev-manual.html#using-systemd-exclusively for more details.
cat <<EOF >> conf/local.conf
DISTRO_FEATURES:append = " systemd security"
INIT_MANAGER = "systemd"
EOF
Optionally enable AppArmor support:
cat <<EOF >> conf/local.conf
DISTRO_FEATURES:append = " apparmor"
EOF
The snap-confine tool assumes that the home directory of root is /root.
Make sure we do not break this assumption, otherwise snaps mount namespace
setup will fail early in the process. To use /root', set ROOT_HOME like this:
cat <<EOF >> conf/local.conf
ROOT_HOME = "/root"
EOF
(Optional) The build can take up a huge amount of disk space, inheriting
rm_work class will help deal with that (see
https://www.yoctoproject.org/docs/latest/ref-manual/ref-manual.html#ref-classes-rm-work
for details):
INHERIT += "rm_work"
# exclude snapd in case you want to develop snapd recipes
RM_WORK_EXCLUDE += "snapd"
- Finally you can now build the demo image via
$ bitbake snapd-demo-image
Depending on your host system the build will take a while.
The snapd-demo-image set IMAGE_ROOTFS_SIZE ?= "819200", this the resulting
image is > 800MB in size. When building custom images make sure to add room for
storing snaps by either setting IMAGE_ROOTFS_EXTRA_SPACE or tuning
IMAGE_ROOTFS_SIZE
- Once the build is done you can boot the image with QEMU with the following command:
$ runqemu qemux86-64 nographic slirp stdioserial
- When the system has fully booted login with root and no password. Afterwards you can use the the snap system as normal.
$ snap install hello-world
$ /snap/bin/hello-world.shell
# path to /snap/bin is automatically addded to user's environment
$ hello-world
Please submit any issues or pull requests on out github project at http://github.com/snapcore/meta-snapd
Head out to https://forum.snapcraft.io/ for support and questions about snapd.