$ git clone -n https://src.fedoraproject.org/rpms/rust-devicemapper.git /var/lib/mock/f40-build-2655684-66912/root/chroot_tmpdir/scmroot/rust-devicemapper
Cloning into '/var/lib/mock/f40-build-2655684-66912/root/chroot_tmpdir/scmroot/rust-devicemapper'...
$ git fetch origin c8f2b699dd536331510f5e78482ed647e17e8513:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-devicemapper
 * [new ref]         c8f2b699dd536331510f5e78482ed647e17e8513 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8f2b69 Update to version 0.34.2