$ git clone -n https://src.fedoraproject.org/rpms/fpc-srpm-macros.git /var/lib/mock/f45-build-609-284/root/chroot_tmpdir/scmroot/fpc-srpm-macros
Cloning into '/var/lib/mock/f45-build-609-284/root/chroot_tmpdir/scmroot/fpc-srpm-macros'...
$ git fetch origin e69f6f7c79c37c6cce49687f6f3a72b027af0ead:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fpc-srpm-macros
 * [new ref]         e69f6f7c79c37c6cce49687f6f3a72b027af0ead -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e69f6f7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild