$ git clone -n https://src.fedoraproject.org/rpms/ghc-pattern-arrows.git /var/lib/mock/f45-build-10575-419/root/chroot_tmpdir/scmroot/ghc-pattern-arrows
Cloning into '/var/lib/mock/f45-build-10575-419/root/chroot_tmpdir/scmroot/ghc-pattern-arrows'...
$ git fetch origin cd5cb2c195eda4fba1ee086b2a135343665b0daa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-pattern-arrows
 * [new ref]         cd5cb2c195eda4fba1ee086b2a135343665b0daa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cd5cb2c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild