$ git clone -n https://src.fedoraproject.org/rpms/rust-typetag.git /var/lib/mock/f45-build-45825-828/root/chroot_tmpdir/scmroot/rust-typetag
Cloning into '/var/lib/mock/f45-build-45825-828/root/chroot_tmpdir/scmroot/rust-typetag'...
$ git fetch origin e4b3bfcc8bd05b8cb64a35a6e65bc7ba3563d55c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-typetag
 * [new ref]         e4b3bfcc8bd05b8cb64a35a6e65bc7ba3563d55c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4b3bfc Update to version 0.2.23; Fixes RHBZ#2480027