$ git clone -n http://git.inferitos.ru/rpms/ppc64-diag /var/lib/mock/inferit-8_8-build-16018-23083/root/chroot_tmpdir/scmroot/ppc64-diag
Cloning into '/var/lib/mock/inferit-8_8-build-16018-23083/root/chroot_tmpdir/scmroot/ppc64-diag'...
$ git fetch origin changed/i8c/ppc64-diag-2.7.9-1.el8:KOJI_FETCH_HEAD
fatal: couldn't find remote ref changed/i8c/ppc64-diag-2.7.9-1.el8
$ git reset --hard changed/i8c/ppc64-diag-2.7.9-1.el8
fatal: ambiguous argument 'changed/i8c/ppc64-diag-2.7.9-1.el8': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'