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man: Document mask workaround for sysext images

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A read-only /usr may ship a sysext image by default and the user wants
to opt out. Currently it's not clear how to do this.
Document that a /dev/null symlink in /etc/extensions/ works to "mask" a
sysext image in a folder with lower precedence.
This commit is contained in:
Kai Lueke 2022-07-22 15:09:21 +02:00
parent 566e4b3a19
commit 519c2f0d6b
1 changed files with 3 additions and 1 deletions
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4
man/systemd-sysext.xml
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@ -108,7 +108,9 @@
accessed.</para>
<para>Note that there is no concept of enabling/disabling installed system extension images: all
installed extension images are automatically activated at boot.</para>
installed extension images are automatically activated at boot. However, you can place a symlink
to <filename>/dev/null</filename> in <filename>/etc/extensions/</filename> to "mask" an image with
the same name in a folder with lower precedence.</para>
<para>A simple mechanism for version compatibility is enforced: a system extension image must carry a
<filename>/usr/lib/extension-release.d/extension-release.<replaceable>$name</replaceable></filename>