$ git clone -n https://src.fedoraproject.org/rpms/rust-fail.git /var/lib/mock/f41-build-side-1-2928810-35102/root/chroot_tmpdir/scmroot/rust-fail
Cloning into '/var/lib/mock/f41-build-side-1-2928810-35102/root/chroot_tmpdir/scmroot/rust-fail'...
$ git fetch origin ba7755c00df1d02041b4182e57d77518ff67f18f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fail
 * [new ref]         ba7755c00df1d02041b4182e57d77518ff67f18f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba7755c unused leaf package for more than two release cycles