$ git clone -n https://src.fedoraproject.org/rpms/firewalk.git /var/lib/mock/f45-build-8986-397/root/chroot_tmpdir/scmroot/firewalk
Cloning into '/var/lib/mock/f45-build-8986-397/root/chroot_tmpdir/scmroot/firewalk'...
$ git fetch origin a3e221053515e809d2eccc2d970c74430cff6d98:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firewalk
 * [new ref]         a3e221053515e809d2eccc2d970c74430cff6d98 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3e2210 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild