I disabled/enabled arm and this confirmed it is the interpreter being
used.
$ sudo update-binfmts --disable qemu-arm
# now fails missing interpreter
Eventually I found I need to unimport&import it after exchanging the binary.
Then I get it to use the new version.
Note (disable all for some ease to read)
$ for i in /usr/share/binfmts/qemu-*; do sudo update-binfmts --unimport $i; done
$ sudo update-binfmts --unimport /usr/share/binfmts/qemu-arm
$ sudo cp /usr/bin/qemu-arm-static.pkg /usr/bin/qemu-arm-static
$ sudo update-binfmts --import /usr/share/binfmts/qemu-arm
$ sudo systemd-nspawn -D /var/lib/machines/armhf-focal -M armhf-focal -b
...
works now
$ machinectl
MACHINE CLASS SERVICE OS VERSION ADDRESSES
armhf-focal container systemd-nspawn ubuntu 20.04 -
And I see it running properly with its tree using qemu static:
$ sudo machinectl status armhf-focal
armhf-focal(a008dc84011f4382b74546f73f43cbaa)
Since: Tue 2020-08-18 12:38:02 UTC; 2min 59s ago
Leader: 81194 (systemd)
Service: systemd-nspawn; class container
Root: /var/lib/machines/armhf-focal
OS: Ubuntu 20.04 LTS
Unit: machine-armhf\x2dfocal.scope
└─payload
├─init.scope
│ └─81194 /usr/bin/qemu-arm-static /lib/systemd/systemd
└─system.slice
├─accounts-daemon.service
│ └─82253 /usr/bin/qemu-arm-static
/usr/lib/accountsservice/accounts-daemon
├─console-getty.service
│ └─82301 /usr/bin/qemu-arm-static /sbin/agetty -o -p --
\u --noclear --keep-baud console 115200,38400,9600 xterm-256color
├─cron.service
│ └─82254 /usr/bin/qemu-arm-static /usr/sbin/cron -f
├─dbus.service
│ ├─81377 /usr/bin/qemu-arm-static /usr/bin/dbus-daemon
--system --address=systemd: --nofork --nopidfile --systemd-activation
--syslog-only
│ ├─81689 /usr/bin/qemu-arm-static /usr/bin/dbus-daemon
--system --address=systemd: --nofork --nopidfile --systemd-activation
--syslog-only
│ └─82256 /usr/bin/qemu-arm-static /usr/bin/dbus-daemon
--system --address=systemd: --nofork --nopidfile --systemd-activation
--syslog-only
├─networkd-dispatcher.service
│ └─82265 /usr/bin/qemu-arm-static /usr/bin/python3
/usr/bin/networkd-dispatcher --run-startup-triggers
├─rsyslog.service
│ └─82267 /usr/bin/qemu-arm-static /usr/sbin/rsyslogd -n
-iNONE
├─systemd-journald.service
│ └─82065 /usr/bin/qemu-arm-static
/lib/systemd/systemd-journald
├─systemd-logind.service
│ └─82271 /usr/bin/qemu-arm-static
/lib/systemd/systemd-logind
└─systemd-resolved.service
└─82250 /usr/bin/qemu-arm-static
/lib/systemd/systemd-resolved
There is one issue left to replace this in a bisect loop around
cp: cannot create regular file '/usr/bin/qemu-arm-static': Text file busy
binfmt Unloads won't help, lsof doesn't list it, ...
But worst case it can be done with reboots.
Ah found it, cp refuses but rm+cp works.
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https://bugs.launchpad.net/bugs/1890881
Title:
qemu-user-static 1:5.0-5ubuntu4 in groovy does not start armhf
container
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