$ git clone -n https://src.fedoraproject.org/rpms/flatpak-builder.git /var/lib/mock/f39-build-1533123-36226/root/chroot_tmpdir/scmroot/flatpak-builder
Cloning into '/var/lib/mock/f39-build-1533123-36226/root/chroot_tmpdir/scmroot/flatpak-builder'...
$ git fetch origin 0628f902d0e646eda8c4d18bffb0f95b7f431894:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak-builder
 * [new ref]         0628f902d0e646eda8c4d18bffb0f95b7f431894 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0628f90 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild