$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_cat.git /var/lib/mock/f40-build-1971912-25224/root/chroot_tmpdir/scmroot/rust-uu_cat
Cloning into '/var/lib/mock/f40-build-1971912-25224/root/chroot_tmpdir/scmroot/rust-uu_cat'...
$ git fetch origin 95e7ba99c7387538c09ab04611850ea35a830739:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_cat
 * [new ref]         95e7ba99c7387538c09ab04611850ea35a830739 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 95e7ba9 Update to version 0.0.27; Fixes: RHBZ#2260196