$ git clone -n https://src.fedoraproject.org/rpms/ghc-NumInstances.git /var/lib/mock/f42-build-877430-180226/root/chroot_tmpdir/scmroot/ghc-NumInstances
Cloning into '/var/lib/mock/f42-build-877430-180226/root/chroot_tmpdir/scmroot/ghc-NumInstances'...
$ git fetch origin 7e3bd63201a5a17898972ec79d4ee8f36a172b64:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-NumInstances
 * [new ref]         7e3bd63201a5a17898972ec79d4ee8f36a172b64 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e3bd63 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild