$ git clone -n https://src.fedoraproject.org/rpms/perl-Ref-Util.git /var/lib/mock/f39-build-1439249-32239/root/chroot_tmpdir/scmroot/perl-Ref-Util
Cloning into '/var/lib/mock/f39-build-1439249-32239/root/chroot_tmpdir/scmroot/perl-Ref-Util'...
$ git fetch origin 79a1acee75a36f06b795a3a1c88556b1a1adaa88:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Ref-Util
 * [new ref]         79a1acee75a36f06b795a3a1c88556b1a1adaa88 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79a1ace Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild