$ git clone -n https://src.fedoraproject.org/rpms/rust-is_ci.git /var/lib/mock/f40-build-795554-140206/root/chroot_tmpdir/scmroot/rust-is_ci
Cloning into '/var/lib/mock/f40-build-795554-140206/root/chroot_tmpdir/scmroot/rust-is_ci'...
$ git fetch origin 9b0b8ff04547c58d61f26fbc70d9e40b4833d238:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-is_ci
 * [new ref]         9b0b8ff04547c58d61f26fbc70d9e40b4833d238 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b0b8ff Update to 1.2.0 (rhbz#2262586)