$ git clone -n https://src.fedoraproject.org/rpms/rust-serde.git /var/lib/mock/f39-build-2190082-51430/root/chroot_tmpdir/scmroot/rust-serde
Cloning into '/var/lib/mock/f39-build-2190082-51430/root/chroot_tmpdir/scmroot/rust-serde'...
$ git fetch origin a11888437445f06dc8b721e37523a15a2fc9a5b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde
 * [new ref]         a11888437445f06dc8b721e37523a15a2fc9a5b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a118884 Update to version 1.0.194; Fixes RHBZ#2256427