$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_path_to_error.git /var/lib/mock/f39-build-2192357-51468/root/chroot_tmpdir/scmroot/rust-serde_path_to_error
Cloning into '/var/lib/mock/f39-build-2192357-51468/root/chroot_tmpdir/scmroot/rust-serde_path_to_error'...
$ git fetch origin 50139a2b37a682e4f18cbf1ecd1d1599a7051a3b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_path_to_error
 * [new ref]         50139a2b37a682e4f18cbf1ecd1d1599a7051a3b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50139a2 Update to version 0.1.15; Fixes RHBZ#2256499