$ git clone -n https://src.fedoraproject.org/rpms/rust-aes-gcm.git /var/lib/mock/f45-build-40033-767/root/chroot_tmpdir/scmroot/rust-aes-gcm
Cloning into '/var/lib/mock/f45-build-40033-767/root/chroot_tmpdir/scmroot/rust-aes-gcm'...
$ git fetch origin 487c4fa1e787a357040259fc22c2b334fb6d3f0a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-aes-gcm
 * [new ref]         487c4fa1e787a357040259fc22c2b334fb6d3f0a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 487c4fa Update to version 0.11.1; Fixes RHBZ#2494008