$ git clone -n https://src.fedoraproject.org/rpms/ninja-build.git /var/lib/mock/f42-build-868157-175963/root/chroot_tmpdir/scmroot/ninja-build
Cloning into '/var/lib/mock/f42-build-868157-175963/root/chroot_tmpdir/scmroot/ninja-build'...
$ git fetch origin 7cdb599c20416d2a31fd413cb35e94234a38da1a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ninja-build
 * [new ref]         7cdb599c20416d2a31fd413cb35e94234a38da1a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7cdb599 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild