$ git clone -n https://src.koozali.org/smeserver/smeserver-email /var/lib/mock/dist-sme11-os-build-185-15054/root/chroot_tmpdir/scmroot/smeserver-email
Cloning into '/var/lib/mock/dist-sme11-os-build-185-15054/root/chroot_tmpdir/scmroot/smeserver-email'...
$ git fetch origin 2.6.0-21:KOJI_FETCH_HEAD
fatal: couldn't find remote ref 2.6.0-21
$ git reset --hard 2.6.0-21
fatal: ambiguous argument '2.6.0-21': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'