$ git clone -n https://src.fedoraproject.org/rpms/libblockdev.git /var/lib/mock/f41-build-side-1-2780631-32492/root/chroot_tmpdir/scmroot/libblockdev
Cloning into '/var/lib/mock/f41-build-side-1-2780631-32492/root/chroot_tmpdir/scmroot/libblockdev'...
$ git fetch origin d4b20d00c089f509dee1070e19cd25bef11f1117:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libblockdev
 * [new ref]         d4b20d00c089f509dee1070e19cd25bef11f1117 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4b20d0 New version 3.2.0