6156bec7a4
If DefaultDependencies=no, /var/ may not be mounted yet when the service is being started. Previously, In such case, if the service has PrivateTmp=disconnected, the service manager created /var/tmp/ on the root filesystem and mounted the disconnected private tmpfs there. That poluted the root filesystem and disturbed gpt-auto-generator on next boot, as /var/ would not be empty anymore. See issue #37258. This changes PrivateTmp=disconnected as the following: - If DefaultDependencies=no and RootDirectory=/RootImage= are not set, then a private tmpfs is mounted _only_ on /tmp/, and set $TMPDIR=/tmp environment variable to suggest the service to use /tmp/. - If DefaultDependencies=yes and RootDirectory=/RootImage= are not set, then implies RequiresMountsFor=/var/, though that is typically redundant, but anyway. Hence, we can safely mount /var/tmp/. - Otherwise, i.e. when one of RootDirectory=/RootImage= is set, behaves as the same as the previous, as the private root filesystem for the service is explicitly prepared by the service manager, and we can safely mount a private tmpfs on /var/tmp/ without any extra dependencies. Fixes #37258. Co-authored-by: Mike Yuan <me@yhndnzj.com>
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