$ git clone -n https://src.fedoraproject.org/rpms/rust-libblkid-rs.git /var/lib/mock/f40-build-2642124-66446/root/chroot_tmpdir/scmroot/rust-libblkid-rs
Cloning into '/var/lib/mock/f40-build-2642124-66446/root/chroot_tmpdir/scmroot/rust-libblkid-rs'...
$ git fetch origin 52f09dc0f43b9800680de6a75fa6a5251e924270:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libblkid-rs
 * [new ref]         52f09dc0f43b9800680de6a75fa6a5251e924270 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52f09dc Update to 0.3.2