$ git clone -n https://src.fedoraproject.org/rpms/rust-percent-encoding.git /var/lib/mock/f40-build-2250990-54100/root/chroot_tmpdir/scmroot/rust-percent-encoding
Cloning into '/var/lib/mock/f40-build-2250990-54100/root/chroot_tmpdir/scmroot/rust-percent-encoding'...
$ git fetch origin c3300717cb8124b5873b1c09073ba65a30b0467d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-percent-encoding
 * [new ref]         c3300717cb8124b5873b1c09073ba65a30b0467d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c330071 Update to version 2.3.1; Fixes RHBZ#2251080