$ git clone -n https://src.fedoraproject.org/rpms/udunits2.git /var/lib/mock/f39-build-1535411-36247/root/chroot_tmpdir/scmroot/udunits2
Cloning into '/var/lib/mock/f39-build-1535411-36247/root/chroot_tmpdir/scmroot/udunits2'...
$ git fetch origin abe8313e648de552c2b695b5a82fcd19e0440a6e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/udunits2
 * [new ref]         abe8313e648de552c2b695b5a82fcd19e0440a6e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at abe8313 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild