$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Cover.git /var/lib/mock/f40-build-749765-114634/root/chroot_tmpdir/scmroot/perl-Devel-Cover
Cloning into '/var/lib/mock/f40-build-749765-114634/root/chroot_tmpdir/scmroot/perl-Devel-Cover'...
$ git fetch origin eaef11e796dfb4d22831fabef7cd0183d50d90b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Cover
 * [new ref]         eaef11e796dfb4d22831fabef7cd0183d50d90b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eaef11e Add dependency to Perl version on which was build