$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer0.22.git /var/lib/mock/f40-build-59022405-6570255/root/chroot_tmpdir/scmroot/rust-gstreamer0.22
Cloning into '/var/lib/mock/f40-build-59022405-6570255/root/chroot_tmpdir/scmroot/rust-gstreamer0.22'...
$ git fetch origin e12577f3953873b17fa0d9319aa76851b5cc749d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer0.22
 * [new ref]         e12577f3953873b17fa0d9319aa76851b5cc749d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e12577f Bump ron dev-dependency from 0.8 to 0.9