$ git clone -n https://src.fedoraproject.org/rpms/perl-Callback.git /var/lib/mock/f39-build-1434035-31903/root/chroot_tmpdir/scmroot/perl-Callback
Cloning into '/var/lib/mock/f39-build-1434035-31903/root/chroot_tmpdir/scmroot/perl-Callback'...
$ git fetch origin 47a89ae51b32b904318df7f4b8c7a50f74e1c9bc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Callback
 * [new ref]         47a89ae51b32b904318df7f4b8c7a50f74e1c9bc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47a89ae Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild