$ git clone -n https://src.fedoraproject.org/rpms/perl-Taint-Runtime.git /var/lib/mock/f45-build-26336-617/root/chroot_tmpdir/scmroot/perl-Taint-Runtime
Cloning into '/var/lib/mock/f45-build-26336-617/root/chroot_tmpdir/scmroot/perl-Taint-Runtime'...
$ git fetch origin 754925353ffd1062c5ffeda1b2360a89d30258ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Taint-Runtime
 * [new ref]         754925353ffd1062c5ffeda1b2360a89d30258ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7549253 Perl 5.44 rebuild