$ git clone -n https://src.fedoraproject.org/rpms/libblockdev.git /var/lib/mock/f41-build-824565-154178/root/chroot_tmpdir/scmroot/libblockdev
Cloning into '/var/lib/mock/f41-build-824565-154178/root/chroot_tmpdir/scmroot/libblockdev'...
$ git fetch origin d5f60691e7a12fe7e944486226f1996b2f777ba8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libblockdev
 * [new ref]         d5f60691e7a12fe7e944486226f1996b2f777ba8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5f6069 fs: Ignore unused-parameter warning in the FS plugin