$ git clone -n https://src.fedoraproject.org/rpms/rust-aes-gcm.git /var/lib/mock/f39-build-1470310-33888/root/chroot_tmpdir/scmroot/rust-aes-gcm
Cloning into '/var/lib/mock/f39-build-1470310-33888/root/chroot_tmpdir/scmroot/rust-aes-gcm'...
$ git fetch origin 08350e5b6a543d2aad8d7639ae0f735de29bf072:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-aes-gcm
 * [new ref]         08350e5b6a543d2aad8d7639ae0f735de29bf072 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08350e5 Update to version 0.10.3; Fixes RHBZ#2240136