$ git clone -n https://src.fedoraproject.org/rpms/perl-constant.git /var/lib/mock/f45-build-27662-625/root/chroot_tmpdir/scmroot/perl-constant
Cloning into '/var/lib/mock/f45-build-27662-625/root/chroot_tmpdir/scmroot/perl-constant'...
$ git fetch origin 2df913e9cf2965a6e920e382541aabbfd6d0b9cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-constant
 * [new ref]         2df913e9cf2965a6e920e382541aabbfd6d0b9cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2df913e Perl 5.44 re-rebuild of bootstrapped packages