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feat(coreos-container-image): systemd can be installed in the image 

Allow to use systemd as an IMAGE_FEATURES inside a container image
This commit is contained in:
Samuel Dolt 2023-03-01 15:17:55 +01:00
parent e9247d5cd0
commit 75c190ab38
3 changed files with 33 additions and 6 deletions
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6
layers/meta-belden-coreos-demo/recipes-demo/containers/coreos-container-image-lighttpd.bb
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@ -2,6 +2,12 @@ SUMMARY = "A lighttpd container image"
inherit coreos-container-image
# Install systemd in the container
IMAGE_FEATURES += "systemd"
# Allow to log using systemd without password
IMAGE_FEATURES += "empty-root-password"
IMAGE_INSTALL:append = " \
busybox \
lighttpd \

3
layers/meta-belden-coreos-demo/recipes-demo/containers/coreos-container-lighttpd.bb
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@ -3,5 +3,4 @@ SUMMARY = "A lighttpd container package"
inherit coreos-container-package
CONTAINER_IMAGE = "coreos-container-image-lighttpd"
PODMAN_RUN_OPTIONS = "-p 80:80 --entrypoint /usr/sbin/lighttpd"
PODMAN_RUN_CMD = "-D -f /etc/lighttpd/lighttpd.conf"
PODMAN_RUN_OPTIONS = "-p 80:80"

30
layers/meta-belden-coreos/classes/coreos-container-image.bbclass
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@ -22,12 +22,24 @@ COREOS_CONTAINER_IMAGE_BASE_INSTALL = '\
COREOS_CONTAINER_IMAGE_EXTRA_INSTALL ?= ""
IMAGE_INSTALL ?= "${COREOS_CONTAINER_IMAGE_BASE_INSTALL} ${COREOS_CONTAINER_IMAGE_EXTRA_INSTALL}"
# Images features for containers
# OCI Parameters
# ==============================================================================
OCI_IMAGE_ENTRYPOINT ?= "${@bb.utils.contains('IMAGE_FEATURES', 'systemd', '/usr/sbin/init', '/usr/bin/sh', d)}"
inherit image
inherit image-oci
# Images features for containers
# ==============================================================================
# Install systemd inside the container
FEATURE_PACKAGES_systemd = "systemd"
# Image Post processings
# ==============================================================================
IMAGE_CMD:oci:append() {
# meta-virtualization default IMAGE_CMD doesn't create a symlink on kirkstone
image_link_name="${IMAGE_LINK_NAME}${IMAGE_NAME_SUFFIX}-oci"
@ -41,17 +53,27 @@ IMAGE_CMD:oci:append() {
# Workaround /var/volatile for now
# See layers/meta-virtualization/recipes-extended/images/container-base.bb
ROOTFS_POSTPROCESS_COMMAND += "${@bb.utils.contains('IMAGE_FEATURES', 'init-manager', '', 'rootfs_fixup_var_volatile ; ', d)}"
ROOTFS_POSTPROCESS_COMMAND += "rootfs_fixup_var_volatile ; "
rootfs_fixup_var_volatile () {
install -m 1777 -d ${IMAGE_ROOTFS}/${localstatedir}/volatile/tmp
install -m 755 -d ${IMAGE_ROOTFS}/${localstatedir}/volatile/log
# When using systemd, systemd is responsible to link /var/{log,tmp} to /var/volutile/{log,tmp}
# As container doesn't normally use systemd, we create the link by ourself here
# in rootfs-postcommands.bbclass, when using initscripts theses link
# are created by running ${IMAGE_ROOTFS}/etc/init.d/populate-volatile.sh
# When the distro is configured to systemd, this is not done, so we need to
# do it here manually (As systemd is not always included in the container)
ln -sf ${localstatedir}/volatile/tmp ${IMAGE_ROOTFS}/${localstatedir}/tmp
ln -sf ${localstatedir}/volatile/log ${IMAGE_ROOTFS}/${localstatedir}/log
}
ROOTFS_POSTPROCESS_COMMAND += "${@bb.utils.contains('IMAGE_FEATURES', 'systemd', 'rootfs_fixup_systemd ; ', '', d)}"
rootfs_fixup_systemd () {
# Mask systemd services that are not needed/doesn't work in a container
# This ensure that the container doesn't boot in systemd emergency mode
systemctl --root=${IMAGE_ROOTFS} mask systemd-remount-fs.service
systemctl --root=${IMAGE_ROOTFS} mask var-volatile.mount
}
# Add support for plugin classes like in coreos-image.bbclass
COREOS_IMAGE_EXTRACLASSES ?= ""
inherit ${COREOS_IMAGE_EXTRACLASSES}