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man: Document mask workaround for sysext images
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.
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@ -108,7 +108,9 @@
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accessed.</para>
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<para>Note that there is no concept of enabling/disabling installed system extension images: all
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installed extension images are automatically activated at boot.</para>
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installed extension images are automatically activated at boot. However, you can place a symlink
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to <filename>/dev/null</filename> in <filename>/etc/extensions/</filename> to "mask" an image with
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the same name in a folder with lower precedence.</para>
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<para>A simple mechanism for version compatibility is enforced: a system extension image must carry a
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<filename>/usr/lib/extension-release.d/extension-release.<replaceable>$name</replaceable></filename>
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