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Use shell script instead of OS Agent for device wipe (#3916)

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Use simple shell script to perform device wipe instead of calling OS Agent to
do that through the UDisks2 API. While it might have been a good idea to use
high level interface for that back then, it turns out it causes more issues
than the benefits it could bring.

Main problem currently is that the OS Agent needs to read sysctl variables, but
those are only set after mounting the overlay partition. But at the same time,
the overlay partition can't be mounted if we want to wipe it - this creates a
dependency cycle through the haos-agent.service.

To get rid of the cycle and simplify things, use a shell script doing basically
the same what the OS Agent does. Since the wipe functionality only makes sense
to be implemented on HAOS targets (not on Supervised), there's little point of
having it in higher layer of abstraction that OS Agent provides.

It should be also checked if changes from #1291 are needed anymore, as the
driving factor for those have been probably the wipe feature in OS Agent too,
but at this point they seem to be harmless.

(cherry picked from commit 6c4f32a8c0cb48ba203d48068a773a5b3895ccfc)
This commit is contained in:
Jan Čermák 2025-03-06 16:39:40 +01:00 committed by Jan Čermák
parent 25ca83287e
commit 4ccc875520
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2 changed files with 32 additions and 4 deletions
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6
buildroot-external/rootfs-overlay/usr/lib/systemd/system/haos-wipe.service
View File

@ -4,15 +4,13 @@ DefaultDependencies=no
RefuseManualStart=true
RefuseManualStop=true
Wants=mnt-boot.mount
Requires=haos-agent.service
After=haos-agent.service mnt-boot.mount
After=mnt-boot.mount
Before=mnt-data.mount mnt-overlay.mount
ConditionKernelCommandLine=haos.wipe=1
[Service]
Type=oneshot
ExecStart=/usr/bin/busctl --verbose --timeout=1h call io.hass.os /io/hass/os/System io.hass.os.System WipeDevice
ExecStartPost=/usr/bin/sed -i 's/\s*haos.wipe=1//g' /mnt/boot/cmdline.txt
ExecStart=/usr/libexec/haos-wipe
[Install]
WantedBy=sysinit.target

30
buildroot-external/rootfs-overlay/usr/libexec/haos-wipe Executable file
View File

@ -0,0 +1,30 @@
#!/bin/sh
set -e
PARTITION_OVERLAY="/dev/disk/by-label/hassos-overlay"
PARTITION_DATA="/dev/disk/by-label/hassos-data"
if [ ! -b "$PARTITION_OVERLAY" ]; then
echo "[ERROR] Overlay partition not found"
exit 1
elif findmnt "$PARTITION_OVERLAY" > /dev/null; then
echo "[ERROR] Unable to wipe overlay partition while it is already mounted"
exit 1
fi
if [ ! -b "$PARTITION_DATA" ]; then
echo "[ERROR] Data partition not found"
exit 1
elif findmnt "$PARTITION_DATA" > /dev/null; then
echo "[ERROR] Unable to wipe data partition while it is already mounted"
exit 1
fi
echo "[INFO] Wiping data partition"
mkfs.ext4 -L "hassos-data" -E lazy_itable_init=0,lazy_journal_init=0 "$PARTITION_DATA"
echo "[INFO] Wiping overlay partition"
mkfs.ext4 -L "hassos-overlay" -I 256 -E lazy_itable_init=0,lazy_journal_init=0 "$PARTITION_OVERLAY"
echo "[INFO] Removing wipe flag from cmdline.txt"
/usr/bin/sed -i 's/\s*haos.wipe=1//g' /mnt/boot/cmdline.txt