$ git clone -n https://src.fedoraproject.org/rpms/perl-Geography-Countries.git /var/lib/mock/f39-build-1434740-31948/root/chroot_tmpdir/scmroot/perl-Geography-Countries
Cloning into '/var/lib/mock/f39-build-1434740-31948/root/chroot_tmpdir/scmroot/perl-Geography-Countries'...
$ git fetch origin 42a3f8f20ff7a878166d622d1a941bb6da73da3e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Geography-Countries
 * [new ref]         42a3f8f20ff7a878166d622d1a941bb6da73da3e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42a3f8f Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild