$ git clone -n https://src.fedoraproject.org/rpms/perl-Unicode-String.git /var/lib/mock/f40-build-778585-129996/root/chroot_tmpdir/scmroot/perl-Unicode-String
Cloning into '/var/lib/mock/f40-build-778585-129996/root/chroot_tmpdir/scmroot/perl-Unicode-String'...
$ git fetch origin ef285dc67146a1647c17385b05f4f09e0c9854f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Unicode-String
 * [new ref]         ef285dc67146a1647c17385b05f4f09e0c9854f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef285dc Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild