$ git clone -n https://src.fedoraproject.org/rpms/ninja-build.git /var/lib/mock/f40-build-787482-134780/root/chroot_tmpdir/scmroot/ninja-build
Cloning into '/var/lib/mock/f40-build-787482-134780/root/chroot_tmpdir/scmroot/ninja-build'...
$ git fetch origin 6af36aa78369ad66ee116422f792ffce5d8abfe5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ninja-build
 * [new ref]         6af36aa78369ad66ee116422f792ffce5d8abfe5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6af36aa Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild