$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_derive.git /var/lib/mock/f41-build-side-1-3134304-39731/root/chroot_tmpdir/scmroot/rust-serde_derive
Cloning into '/var/lib/mock/f41-build-side-1-3134304-39731/root/chroot_tmpdir/scmroot/rust-serde_derive'...
$ git fetch origin a012da8aa35541a02660289605a131dfadfba443:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_derive
 * [new ref]         a012da8aa35541a02660289605a131dfadfba443 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a012da8 Update to version 1.0.215; Fixes RHBZ#2325335