$ git clone -n https://src.fedoraproject.org/rpms/rust-async-signal.git /var/lib/mock/f45-build-40280-770/root/chroot_tmpdir/scmroot/rust-async-signal
Cloning into '/var/lib/mock/f45-build-40280-770/root/chroot_tmpdir/scmroot/rust-async-signal'...
$ git fetch origin b6c245e23b1f2e793bec96840c552497ece99618:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-signal
 * [new ref]         b6c245e23b1f2e793bec96840c552497ece99618 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6c245e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild