$ git clone -n https://src.fedoraproject.org/rpms/rust-typetag-impl.git /var/lib/mock/f40-build-2260690-54418/root/chroot_tmpdir/scmroot/rust-typetag-impl
Cloning into '/var/lib/mock/f40-build-2260690-54418/root/chroot_tmpdir/scmroot/rust-typetag-impl'...
$ git fetch origin 865b55526bd8e99156880fb0bad43a2207e4871d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-typetag-impl
 * [new ref]         865b55526bd8e99156880fb0bad43a2207e4871d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 865b555 Update to version 0.2.15; Fixes RHBZ#2253826