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* mount: check for more requisite mountpoint conditions In order to be able to mount a repository over a mountpoint target directory via FUSE, that target directory needs to be both writeable and executable for the UID performing the mount. Without this patch, `restic mount` only checks for the target pathname's existence, which can lead to a lot of data transfer and/or computation for large repos to be performed before eventually croaking with a fatal "fusermount: failed to chdir to mountpoint: Permission denied" (or similar) error. FUSE does allow for mounting over a target path that refers to a regular (writeable) file, but the result is not accessible via chdir(), so we prevent that as well, and accept only directory inodes as the intended target mountpoint path. * Don't use snake_case identifiers * Add changelog entry * tweak changelog summary --------- Co-authored-by: Michael Eischer <michael.eischer@fau.de>