$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Taint.git /var/lib/mock/f45-build-26860-619/root/chroot_tmpdir/scmroot/perl-Test-Taint
Cloning into '/var/lib/mock/f45-build-26860-619/root/chroot_tmpdir/scmroot/perl-Test-Taint'...
$ git fetch origin 2837d6bc8640395b28e6436f915d8d8e41137565:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Taint
 * [new ref]         2837d6bc8640395b28e6436f915d8d8e41137565 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2837d6b Perl 5.44 rebuild