$ git clone -n https://src.fedoraproject.org/rpms/libmng.git /var/lib/mock/f39-build-1457984-33029/root/chroot_tmpdir/scmroot/libmng
Cloning into '/var/lib/mock/f39-build-1457984-33029/root/chroot_tmpdir/scmroot/libmng'...
$ git fetch origin 2682aeff1aef29d45a7e94f23583a6b4e6bb0dc5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmng
 * [new ref]         2682aeff1aef29d45a7e94f23583a6b4e6bb0dc5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2682aef Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild