$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-images.git /var/lib/mock/f39-build-1506884-35212/root/chroot_tmpdir/scmroot/gap-pkg-images
Cloning into '/var/lib/mock/f39-build-1506884-35212/root/chroot_tmpdir/scmroot/gap-pkg-images'...
$ git fetch origin 19b14cc8f94fd96be73d1a76b319c58df9d7778c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-images
 * [new ref]         19b14cc8f94fd96be73d1a76b319c58df9d7778c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19b14cc Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild