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add support for unified image layout #1870

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merged 5 commits into from
Dec 17, 2021
+590 −218
Merged

add support for unified image layout #1870

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c4c2dc2
systemd: exclude default repart service
bcressey Nov 18, 2021
067671a
release: use systemd-repart for partition resizing
bcressey Nov 18, 2021
6f2c173
build: add support for building unified images
bcressey Nov 18, 2021
4c7912f
pubsys: add support for publishing unified images
bcressey Nov 18, 2021
29de89f
release: label overlayfs state directories
bcressey Dec 13, 2021
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14 changes: 14 additions & 0 deletions packages/release/local.mount
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
[Unit]
Description=Local Directory (/local)
DefaultDependencies=no
Conflicts=umount.target
Before=local-fs.target umount.target

[Mount]
What=/dev/disk/by-partlabel/BOTTLEROCKET-DATA
Where=/local
Type=ext4
Options=defaults,noatime,nosuid,nodev

[Install]
WantedBy=preconfigured.target
42 changes: 10 additions & 32 deletions packages/release/prepare-local.service
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Original file line number Diff line number Diff line change
@@ -1,44 +1,20 @@
[Unit]
Description=Prepare Local Directory (/local)
DefaultDependencies=no

# We need udev to create /dev/disk/by-partlabel/BOTTLEROCKET-DATA first.
Wants=dev-disk-by\x2dpartlabel-BOTTLEROCKET\x2dDATA.device
After=dev-disk-by\x2dpartlabel-BOTTLEROCKET\x2dDATA.device
RequiresMountsFor=/local

[Service]
Type=oneshot
Environment=BOTTLEROCKET_DATA=/dev/disk/by-partlabel/BOTTLEROCKET-DATA
Environment=LOCAL_DIR=/local

# To "grow" the partition, we delete it and recreate it at the larger size, then
# write it back to the device. udevd observes the write via inotify, and tells
# the kernel to reload the partition table. This causes the partition link to be
# deleted and then recreated.
ExecStart=/usr/sbin/growpart ${BOTTLEROCKET_DATA}

# If the GPT label was not already at the end of the disk, the first pass will
# write it there, but any additional sectors beyond the original position were
# not included in the resized partition. Now that the kernel has reloaded the
# partition table, the second pass can find and use those sectors.
ExecStart=/usr/sbin/growpart ${BOTTLEROCKET_DATA}

# The above note means we can't have a "normal" mount unit here, because it would
# depend on the link, and would immediately transition to the failed state when the
# link is removed. systemd will create local.mount for us as a side effect.
ExecStart=/usr/bin/mount \
-o defaults,noatime,nosuid,nodev \
${BOTTLEROCKET_DATA} ${LOCAL_DIR}

# After the mount is active, we grow the filesystem to fill the resized partition,
# and ensure that it has the directories we need for subsequent mounts.
ExecStart=/usr/lib/systemd/systemd-growfs ${LOCAL_DIR}
# Create the directories we need for our bind mounts.
ExecStart=/usr/bin/mkdir -p ${LOCAL_DIR}/var ${LOCAL_DIR}/opt ${LOCAL_DIR}/mnt

# Create the directories we need to set up a read-write overlayfs for the kernel
# development sources and the kernel modules
ExecStart=/usr/bin/rm -rf ${LOCAL_DIR}/var/lib/kernel-devel \
%{LOCAL_DIR}/var/lib/kernel-modules
# development sources and kernel modules.
ExecStart=/usr/bin/rm -rf \
${LOCAL_DIR}/var/lib/kernel-devel \
${LOCAL_DIR}/var/lib/kernel-modules
ExecStart=/usr/bin/mkdir -p \
${LOCAL_DIR}/var/lib/kernel-devel/.overlay/lower \
${LOCAL_DIR}/var/lib/kernel-devel/.overlay/upper \
Expand All @@ -48,11 +24,13 @@ ExecStart=/usr/bin/mkdir -p \

# Create the directories we need to set up a read-write overlayfs for any CNI
# plugin binaries.
ExecStart=/usr/bin/rm -rf ${LOCAL_DIR}/opt/cni ${LOCAL_DIR}/var/lib/cni-plugins
ExecStart=/usr/bin/rm -rf \
${LOCAL_DIR}/opt/cni \
${LOCAL_DIR}/var/lib/cni-plugins
ExecStart=/usr/bin/mkdir -p \
${LOCAL_DIR}/opt/cni/bin \
${LOCAL_DIR}/var/lib/cni-plugins/.overlay/upper \
${LOCAL_DIR}/var/lib/cni-plugins/.overlay/work \
${LOCAL_DIR}/var/lib/cni-plugins/.overlay/work

RemainAfterExit=true
StandardError=journal+console
Expand Down
12 changes: 12 additions & 0 deletions packages/release/release-repart-local.conf
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@@ -0,0 +1,12 @@
[Partition]
# This is the partition type UUID for BOTTLEROCKET-DATA, which will be resized
# to fill the remaining sectors on the disk where it resides.
Type=626f7474-6c65-6474-6861-726d61726b73

# We want the partition to end on the last 1 MiB boundary before the end of
# the disk, to match the historical implementation. Assuming the disk itself is
# an even multiple of MiBs in size, and using 512 byte sectors as an example,
# we need 33 sectors for the GPT label in the last MiB, and therefore want 2015
# sectors left, or 1031680 bytes. The repart tool expects a multiple of 4096,
# which is (1031680 - (1031680 % 4096)), or 1028096 bytes.
PaddingMinBytes=1028096
16 changes: 13 additions & 3 deletions packages/release/release.spec
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Expand Up @@ -7,6 +7,7 @@ Summary: Bottlerocket release
License: Apache-2.0 OR MIT

Source11: nsswitch.conf
Source96: release-repart-local.conf
Source97: release-sysctl.conf
Source98: release-systemd-system.conf
Source99: release-tmpfiles.conf
Expand All @@ -31,6 +32,7 @@ Source1008: var-lib-bottlerocket.mount
Source1009: etc-cni.mount
Source1010: mnt.mount
Source1012: opt-cni-bin.mount
Source1013: local.mount

# CD-ROM mount & associated udev rules
Source1015: media-cdrom.mount
Expand All @@ -45,6 +47,7 @@ Source1023: lib-modules.mount.in
# Mounts that require helper programs
Source1040: prepare-boot.service
Source1041: prepare-local.service
Source1042: repart-local.service

# Services for kdump support
Source1060: capture-kernel-dump.service
Expand Down Expand Up @@ -101,6 +104,9 @@ install -p -m 0644 %{S:11} %{buildroot}%{_cross_factorydir}%{_cross_sysconfdir}
install -d %{buildroot}%{_cross_factorydir}%{_cross_sysconfdir}/wicked/ifconfig
install -p -m 0644 %{S:1000} %{buildroot}%{_cross_factorydir}%{_cross_sysconfdir}/wicked/ifconfig

install -d %{buildroot}%{_cross_libdir}/repart.d
install -p -m 0644 %{S:96} %{buildroot}%{_cross_libdir}/repart.d/80-local.conf
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Why is this a drop-in, and not part of the unit itself?

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systemd-repart looks for its config files in /usr/lib/repart.d, like howsystemd-tmpfiles looks in /usr/lib/tmpfiles.d.


install -d %{buildroot}%{_cross_sysctldir}
install -p -m 0644 %{S:97} %{buildroot}%{_cross_sysctldir}/80-release.conf

Expand All @@ -117,9 +123,9 @@ EOF

install -d %{buildroot}%{_cross_unitdir}
install -p -m 0644 \
%{S:1001} %{S:1002} %{S:1003} %{S:1004} %{S:1005} \
%{S:1006} %{S:1007} %{S:1008} %{S:1009} %{S:1010} %{S:1011} %{S:1012} \
%{S:1015} %{S:1040} %{S:1041} %{S:1060} %{S:1061} %{S:1062} %{S:1080} \
%{S:1001} %{S:1002} %{S:1003} %{S:1004} %{S:1005} %{S:1006} %{S:1007} \
%{S:1008} %{S:1009} %{S:1010} %{S:1011} %{S:1012} %{S:1013} %{S:1015} \
%{S:1040} %{S:1041} %{S:1042} %{S:1060} %{S:1061} %{S:1062} %{S:1080} \
Comment on lines -120 to +128
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This hurts to review 😰

%{buildroot}%{_cross_unitdir}

install -d %{buildroot}%{_cross_unitdir}/systemd-tmpfiles-setup.service.d
Expand Down Expand Up @@ -162,6 +168,8 @@ ln -s %{_cross_unitdir}/preconfigured.target %{buildroot}%{_cross_unitdir}/defau
%{_cross_sysctldir}/80-release.conf
%{_cross_tmpfilesdir}/release.conf
%{_cross_libdir}/os-release
%dir %{_cross_libdir}/repart.d
%{_cross_libdir}/repart.d/80-local.conf
%{_cross_libdir}/systemd/system.conf.d/80-release.conf
%{_cross_unitdir}/configured.target
%{_cross_unitdir}/preconfigured.target
Expand All @@ -174,12 +182,14 @@ ln -s %{_cross_unitdir}/preconfigured.target %{buildroot}%{_cross_unitdir}/defau
%{_cross_unitdir}/load-crash-kernel.service
%{_cross_unitdir}/prepare-boot.service
%{_cross_unitdir}/prepare-local.service
%{_cross_unitdir}/repart-local.service
%{_cross_unitdir}/var.mount
%{_cross_unitdir}/opt.mount
%{_cross_unitdir}/mnt.mount
%{_cross_unitdir}/etc-cni.mount
%{_cross_unitdir}/opt-cni-bin.mount
%{_cross_unitdir}/media-cdrom.mount
%{_cross_unitdir}/local.mount
%{_cross_unitdir}/*-lower.mount
%{_cross_unitdir}/*-kernels.mount
%{_cross_unitdir}/*-licenses.mount
Expand Down
29 changes: 29 additions & 0 deletions packages/release/repart-local.service
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Original file line number Diff line number Diff line change
@@ -0,0 +1,29 @@
[Unit]
Description=Resize Data Partition
DefaultDependencies=no
Conflicts=shutdown.target
Wants=dev-disk-by\x2dpartlabel-BOTTLEROCKET\x2dDATA.device
After=dev-disk-by\x2dpartlabel-BOTTLEROCKET\x2dDATA.device

# Ensure the device is mounted first, to avoid racing with the unit that tries
# to mount it since the symlink can disappear if the partition is resized.
RequiresMountsFor=/local

[Service]
Type=oneshot

# Resize the partition, whether or not it resides on the same disk as /.
ExecStart=/usr/bin/systemd-repart --dry-run=no /dev/disk/by-partlabel/BOTTLEROCKET-DATA

# Grow the filesystem to fill the partition. Doing this in another unit could
# introduce a race if the underlying block device is not ready after resizing.
ExecStart=/usr/lib/systemd/systemd-growfs /local

RemainAfterExit=true
StandardError=journal+console

# systemd-repart returns 77 if there's no existing GPT partition table
SuccessExitStatus=77

[Install]
WantedBy=local-fs.target
1 change: 1 addition & 0 deletions packages/systemd/systemd.spec
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Expand Up @@ -326,6 +326,7 @@ rm -f %{buildroot}%{_cross_libdir}/systemd/{system,user}/graphical.target
%exclude %{_cross_unitdir}/systemd-ask-password-console.path
%exclude %{_cross_unitdir}/systemd-ask-password-wall.path
%exclude %{_cross_unitdir}/systemd-oomd.service
%exclude %{_cross_unitdir}/systemd-repart.service
%exclude %{_cross_unitdir}/sysinit.target.wants/systemd-ask-password-console.path
%exclude %{_cross_unitdir}/multi-user.target.wants/systemd-ask-password-wall.path

Expand Down