$ git clone -n https://src.fedoraproject.org/rpms/rust-cmd_lib.git /var/lib/mock/f42-build-side-1-3533183-46342/root/chroot_tmpdir/scmroot/rust-cmd_lib
Cloning into '/var/lib/mock/f42-build-side-1-3533183-46342/root/chroot_tmpdir/scmroot/rust-cmd_lib'...
$ git fetch origin f4bc773805795bf4fa702d1b5e29bf5483210c38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cmd_lib
 * [new ref]         f4bc773805795bf4fa702d1b5e29bf5483210c38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f4bc773 Update to version 1.9.5