$ git clone -n https://src.fedoraproject.org/rpms/rust-pep440_rs.git /var/lib/mock/f39-build-1543951-36603/root/chroot_tmpdir/scmroot/rust-pep440_rs
Cloning into '/var/lib/mock/f39-build-1543951-36603/root/chroot_tmpdir/scmroot/rust-pep440_rs'...
$ git fetch origin 916459d6129e21de9118e50d4ae3f3a456e6d5d7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pep440_rs
 * [new ref]         916459d6129e21de9118e50d4ae3f3a456e6d5d7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 916459d Update to version 0.3.12; Fixes RHBZ#2241144