$ git clone -n https://src.fedoraproject.org/rpms/rust-io-lifetimes.git /var/lib/mock/f45-build-42627-795/root/chroot_tmpdir/scmroot/rust-io-lifetimes
Cloning into '/var/lib/mock/f45-build-42627-795/root/chroot_tmpdir/scmroot/rust-io-lifetimes'...
$ git fetch origin efed63a6a435a1db19e4327e7fe3f003ac465f1a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-io-lifetimes
 * [new ref]         efed63a6a435a1db19e4327e7fe3f003ac465f1a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at efed63a Update to version 3.0.1; Fixes RHBZ#2386914