$ git clone -n https://src.fedoraproject.org/rpms/rust-async-channel.git /var/lib/mock/f45-build-40243-769/root/chroot_tmpdir/scmroot/rust-async-channel
Cloning into '/var/lib/mock/f45-build-40243-769/root/chroot_tmpdir/scmroot/rust-async-channel'...
$ git fetch origin a800169cb43fdd9c049921c25030ed8fb082be07:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-channel
 * [new ref]         a800169cb43fdd9c049921c25030ed8fb082be07 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a800169 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild