$ git clone -n https://src.fedoraproject.org/rpms/rust-choosier.git /var/lib/mock/f45-build-40749-775/root/chroot_tmpdir/scmroot/rust-choosier
Cloning into '/var/lib/mock/f45-build-40749-775/root/chroot_tmpdir/scmroot/rust-choosier'...
$ git fetch origin e7b51b59501b14c88d8a3afb19b22baca082469c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-choosier
 * [new ref]         e7b51b59501b14c88d8a3afb19b22baca082469c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7b51b5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild