$ git clone -n https://src.fedoraproject.org/rpms/perl-Bisect-Perl-UsingGit.git /var/lib/mock/f45-build-21881-588/root/chroot_tmpdir/scmroot/perl-Bisect-Perl-UsingGit
Cloning into '/var/lib/mock/f45-build-21881-588/root/chroot_tmpdir/scmroot/perl-Bisect-Perl-UsingGit'...
$ git fetch origin 8ffeb89118eef7d5598c95a6d0dc48fa0a10c4e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Bisect-Perl-UsingGit
 * [new ref]         8ffeb89118eef7d5598c95a6d0dc48fa0a10c4e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ffeb89 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild