$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_derive.git /var/lib/mock/f39-build-2339490-59650/root/chroot_tmpdir/scmroot/rust-serde_derive
Cloning into '/var/lib/mock/f39-build-2339490-59650/root/chroot_tmpdir/scmroot/rust-serde_derive'...
$ git fetch origin 0d08355997706881dabe9040e5a0d90f24d0cbb9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_derive
 * [new ref]         0d08355997706881dabe9040e5a0d90f24d0cbb9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d08355 Update to version 1.0.196; Fixes RHBZ#2260591