$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_yaml.git /var/lib/mock/f40-build-2716520-72641/root/chroot_tmpdir/scmroot/rust-serde_yaml
Cloning into '/var/lib/mock/f40-build-2716520-72641/root/chroot_tmpdir/scmroot/rust-serde_yaml'...
$ git fetch origin 91fd314156be726e66fcfa95764356f7e4d67c9b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_yaml
 * [new ref]         91fd314156be726e66fcfa95764356f7e4d67c9b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91fd314 Update to version 0.9.33; Fixes RHBZ#2264822