$ git clone -n https://src.fedoraproject.org/rpms/rust-libblkid-rs.git /var/lib/mock/f39-build-1861489-42487/root/chroot_tmpdir/scmroot/rust-libblkid-rs
Cloning into '/var/lib/mock/f39-build-1861489-42487/root/chroot_tmpdir/scmroot/rust-libblkid-rs'...
$ git fetch origin 195232fb4d2515080412b2776980af7a0a608fb5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libblkid-rs
 * [new ref]         195232fb4d2515080412b2776980af7a0a608fb5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 195232f Rebuild for new side-tag build