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113 lines
3.6 KiB
113 lines
3.6 KiB
error_handler() {
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echo failed at ${BASH_LINENO[0]}
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}
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trap error_handler ERR
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create_rootfs_diff() {
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sudo rm -f "$CACHE_ROOTFS_TARBALL_PATH" # remove the old diff tarball from previous run, if exists
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cd /upper
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sudo tar -cf "$CACHE_ROOTFS_TARBALL_PATH" .
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cd
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}
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apply_rootfs_diff() {
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cd /
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sudo tar -xf "$CACHE_ROOTFS_TARBALL_PATH" 2>/dev/null || true
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cd
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}
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prepare_build() {
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# create and mount the required volumes where they're expected
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mkdir -p /tmp/openpilot /tmp/scons_cache /tmp/comma_download_cache /tmp/openpilot_cache
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sudo mount --bind "$REPO" /tmp/openpilot
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sudo mount --bind "$REPO/.ci_cache/scons_cache" /tmp/scons_cache || true
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sudo mount --bind "$REPO/.ci_cache/comma_download_cache" /tmp/comma_download_cache || true
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sudo mount --bind "$REPO/.ci_cache/openpilot_cache" /tmp/openpilot_cache || true
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# needed for the unit tests not to fail
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sudo chmod 755 /sys/fs/pstore
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}
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post_commit_root() {
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# we have the diff tarball, now let's remove the folder too
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sudo rm -rf /upper
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# now we apply it straight away
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apply_rootfs_diff
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# before the next tasks are run, finalize the environment for them
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prepare_build
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}
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# warning: this function initiates a somewhat complicated program flow, follow carefully
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# (even despite this part was made sure to not be too relevant for the rest of the job)
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commit_root() {
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# if that's a first execution
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if ! [ -e /root_committed ]
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then
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# prepare directories
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sudo mkdir -p /base /newroot /upper /work
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# re-execute the main script (causing it to go straight to `build_inside_namespace`), but
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# inside the newly created namespace, in a way which would cause all mounts
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# created to automatically umount before it exits
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sudo unshare -f --kill-child -m "$SELF_PATH" build_inside_namespace
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ec=$?
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# after it exited, remove the created directories (except the one containing created diff)
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sudo rm -rf /base /newroot /work
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# finally, create the rootfs diff tarball (to be pushed into the CI native cache)
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create_rootfs_diff
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# after creating the rootfs diff, bring the system into a state as if it was restored from cache
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post_commit_root
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exit $ec
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fi
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}
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reexecute() {
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touch /root_committed
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sudo -u runner "$SELF_PATH"
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ec=$?
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exit $ec
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}
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# that's where the script goes after being re-executed for the first time
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build_inside_namespace() {
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# initialize the mounts namespace on overlayfs to be able to prepare the rootfs diff
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mount --bind / /base
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mount -t overlay overlay -o lowerdir=/base,upperdir=/upper,workdir=/work /newroot
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# apply the current DNS config (beware: systemd often symlinks /etc/resolv.conf, that's why it's needed)
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rm -f /newroot/etc/resolv.conf
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touch /newroot/etc/resolv.conf
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cat /etc/resolv.conf > /newroot/etc/resolv.conf
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# switch the namespace's root mount to the newly created one
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mkdir -p /newroot/old
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cd /newroot
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pivot_root . old
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# initialize basic required POSIX-standard additional mounts
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mount -t proc proc /proc
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mount -t devtmpfs devtmpfs /dev
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mkdir -p /dev/pts
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mount -t devpts devpts /dev/pts
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mount -t proc proc /proc
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mount -t sysfs sysfs /sys
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# re-execute the main script for the 2nd time, causing it to go back to the main flow
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# (but this time already inside the newly created namespace)
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reexecute
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# after the main flow terminates and the namespace exist, post_commit_root is executed - be sure to look at it
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}
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if [ "$1" = "build_inside_namespace" ]
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then
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build_inside_namespace
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exit
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fi
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