$ git clone -n https://src.fedoraproject.org/rpms/unpaper.git /var/lib/mock/f40-build-2064823-49167/root/chroot_tmpdir/scmroot/unpaper
Cloning into '/var/lib/mock/f40-build-2064823-49167/root/chroot_tmpdir/scmroot/unpaper'...
$ git fetch origin 1a8fccbf3dad90deac5fd4089450333c997c2777:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/unpaper
 * [new ref]         1a8fccbf3dad90deac5fd4089450333c997c2777 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a8fccb Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild