$ git clone -n https://src.fedoraproject.org/rpms/rust-devicemapper-sys.git /var/lib/mock/f40-build-2659755-66918/root/chroot_tmpdir/scmroot/rust-devicemapper-sys
Cloning into '/var/lib/mock/f40-build-2659755-66918/root/chroot_tmpdir/scmroot/rust-devicemapper-sys'...
$ git fetch origin c7599691945fda45aa26b70a8a63bb65cd7f65fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-devicemapper-sys
 * [new ref]         c7599691945fda45aa26b70a8a63bb65cd7f65fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c759969 Update to version 0.3.0