$ git clone -n https://src.fedoraproject.org/rpms/perl-Specio.git /var/lib/mock/f42-build-side-1-3499862-45966/root/chroot_tmpdir/scmroot/perl-Specio
Cloning into '/var/lib/mock/f42-build-side-1-3499862-45966/root/chroot_tmpdir/scmroot/perl-Specio'...
$ git fetch origin 1608a566ebf6a7cb8007e352df2a4335a49f986e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Specio
 * [new ref]         1608a566ebf6a7cb8007e352df2a4335a49f986e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1608a56 Update to 0.50