$ git clone -n https://src.fedoraproject.org/rpms/poppler.git /var/lib/mock/f39-build-1493355-34539/root/chroot_tmpdir/scmroot/poppler
Cloning into '/var/lib/mock/f39-build-1493355-34539/root/chroot_tmpdir/scmroot/poppler'...
$ git fetch origin cc20dd56fffba0fe83e98adc4a107201d9d1cb56:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/poppler
 * [new ref]         cc20dd56fffba0fe83e98adc4a107201d9d1cb56 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc20dd5 Update to 23.08.0