$ git clone -n https://src.fedoraproject.org/rpms/rust-which.git /var/lib/mock/f45-build-46228-832/root/chroot_tmpdir/scmroot/rust-which
Cloning into '/var/lib/mock/f45-build-46228-832/root/chroot_tmpdir/scmroot/rust-which'...
$ git fetch origin 3a574b80619d0aa08ec4778e9ed5e1e7969b6a91:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-which
 * [new ref]         3a574b80619d0aa08ec4778e9ed5e1e7969b6a91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a574b8 Update to version 8.0.6; Fixes RHBZ#2524623