$ git clone -n https://src.fedoraproject.org/rpms/vobcopy.git /var/lib/mock/f40-build-750529-115123/root/chroot_tmpdir/scmroot/vobcopy
Cloning into '/var/lib/mock/f40-build-750529-115123/root/chroot_tmpdir/scmroot/vobcopy'...
$ git fetch origin ca1f91eab9dd15ea25c09e1724dff8ba9818c9c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vobcopy
 * [new ref]         ca1f91eab9dd15ea25c09e1724dff8ba9818c9c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca1f91e Initial import; Fixes: RHBZ#2235391