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Bug#1061960: systemd-binfmt.service should get started when something gets added into a previously empty /usr/lib/binfmt.d

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Johannes Schauer Marin Rodrigues

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Jan 30, 2024, 9:00:05 AM1/30/24

Package: systemd
Version: 252.19-1~deb12u1
Severity: normal

Hi,

steps to reproduce:

$ debvm-create
[...]
$ debvm-run
[...]
root@testvm:~# systemctl status systemd-binfmt.service
○ systemd-binfmt.service - Set Up Additional Binary Formats
Loaded: loaded (/usr/lib/systemd/system/systemd-binfmt.service; static)
Active: inactive (dead)
Condition: start condition unmet at Tue 2024-01-30 13:44:24 UTC; 25s ago
├─ ConditionDirectoryNotEmpty=|/lib/binfmt.d was not met
├─ ConditionDirectoryNotEmpty=|/usr/lib/binfmt.d was not met
├─ ConditionDirectoryNotEmpty=|/usr/local/lib/binfmt.d was not met
├─ ConditionDirectoryNotEmpty=|/etc/binfmt.d was not met
└─ ConditionDirectoryNotEmpty=|/run/binfmt.d was not met
root@testvm:~# apt install qemu-user-static
[...]
root@testvm:~# systemctl status systemd-binfmt.service
○ systemd-binfmt.service - Set Up Additional Binary Formats
Loaded: loaded (/usr/lib/systemd/system/systemd-binfmt.service; static)
Active: inactive (dead)
Condition: start condition unmet at Tue 2024-01-30 13:44:24 UTC; 2min 47s ago
├─ ConditionDirectoryNotEmpty=|/lib/binfmt.d was not met
├─ ConditionDirectoryNotEmpty=|/usr/lib/binfmt.d was not met
├─ ConditionDirectoryNotEmpty=|/usr/local/lib/binfmt.d was not met
├─ ConditionDirectoryNotEmpty=|/etc/binfmt.d was not met
└─ ConditionDirectoryNotEmpty=|/run/binfmt.d was not met

As a result, just installing a binfmt provider will not immediately enable it.

Starting or restarting makes it work as tested by Jochen Sprickerhof

Maybe the binfmt.d trigger should restart systemd-binfmt.service so that
enabling a new binfmt works without rebooting the machine.

Thanks!

cheers, josch

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