Owen W. Taylor
ff6883ca06
/var needs to be read-write for a functioning system. Various systemd services will fail to start if /var is read-only. After we remount /var (or if we skip remounting /var because / is read-only), if /var is still readonly, mount a tmpfs file system on /var. While this isn't strictly part of ostree, keeping it here makes sense because it keeps twiddling around with the /var mount in one place for easier coordination and maintenance. This will likely need updating if systemd gains better support for a readonly root filesystem. https://bugzilla.gnome.org/show_bug.cgi?id=732979
OSTree is a tool for managing bootable, immutable, versioned filesystem trees. While it takes over some of the roles of tradtional "package managers" like dpkg and rpm, it is not a package system; nor is it a tool for managing full disk images. Instead, it sits between those levels, offering a blend of the advantages (and disadvantages) of both.
For more information, see: