$ git clone -n https://src.fedoraproject.org/rpms/perl-rpm-build-perl.git /var/lib/mock/f42-build-877226-180138/root/chroot_tmpdir/scmroot/perl-rpm-build-perl
Cloning into '/var/lib/mock/f42-build-877226-180138/root/chroot_tmpdir/scmroot/perl-rpm-build-perl'...
$ git fetch origin b5a8b174d9066857a94f6189dd2ee84e58866f01:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-rpm-build-perl
 * [new ref]         b5a8b174d9066857a94f6189dd2ee84e58866f01 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5a8b17 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild