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credentials: document that their path is stable for system services

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This commit is contained in:
Joerg Behrmann
2023-10-20 11:44:46 +01:00
committed by Luca Boccassi
parent af7417ac7b
commit cf37171890
2 changed files with 12 additions and 2 deletions
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man/systemd.exec.xml
+6 -1
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@@ -3430,7 +3430,12 @@ StandardInputData=V2XigLJyZSBubyBzdHJhbmdlcnMgdG8gbG92ZQpZb3Uga25vdyB0aGUgcnVsZX
<varname>ExecStart=</varname> command line use <literal>${CREDENTIALS_DIRECTORY}/mycred</literal>,
e.g. <literal>ExecStart=cat ${CREDENTIALS_DIRECTORY}/mycred</literal>. In order to reference the path
a credential may be read from within a <varname>Environment=</varname> line use
<literal>%d/mycred</literal>, e.g. <literal>Environment=MYCREDPATH=%d/mycred</literal>.</para>
<literal>%d/mycred</literal>, e.g. <literal>Environment=MYCREDPATH=%d/mycred</literal>. For system
services the path may also be referenced as
<literal>/run/credentials/<replaceable>UNITNAME</replaceable></literal> in cases where no
interpolation is possible, e.g. configuration files of software that does not yet support credentials
natively. <varname>$CREDENTIALS_DIRECTORY</varname> is considered the primary interface to look for
credentials, though, since it also works for user services.</para>
<para>Currently, an accumulated credential size limit of 1 MB per unit is enforced.</para>