$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_yaml.git /var/lib/mock/f39-build-2160726-50946/root/chroot_tmpdir/scmroot/rust-serde_yaml
Cloning into '/var/lib/mock/f39-build-2160726-50946/root/chroot_tmpdir/scmroot/rust-serde_yaml'...
$ git fetch origin fe98afe350b615035b6cb4f702540198327f4d53:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_yaml
 * [new ref]         fe98afe350b615035b6cb4f702540198327f4d53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe98afe Update to version 0.9.29; Fixes RHBZ#2255451