$ git clone -n https://src.fedoraproject.org/rpms/rust-typetag.git /var/lib/mock/f40-build-2260689-54418/root/chroot_tmpdir/scmroot/rust-typetag
Cloning into '/var/lib/mock/f40-build-2260689-54418/root/chroot_tmpdir/scmroot/rust-typetag'...
$ git fetch origin 30c5fd3fb46dc030564e0490d3a7371485a7dd30:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-typetag
 * [new ref]         30c5fd3fb46dc030564e0490d3a7371485a7dd30 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30c5fd3 Update to version 0.2.15; Fixes RHBZ#2253825