While trying to mount CephFS using libceph and systemd, mount.ceph tries to call "modinfo", "modprobe", and "grep", but fails with the error "sh: line 1: modprobe: command not found". This is because ceph calls these binaries by running the command "sh -c -- <application> %s %s", which does not pass the PATH environment variable through. This isn't usually a problem, because ceph, by default, calls the paths of these binaries as they would be in debian, in /sbin and /bin, but a change was made to replace these with relative paths, thus breaking the mounting process entirely. Replacing these relative paths with absolute store paths alleviates this issue whilst preserving all functionality.
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