$ git clone -n https://src.fedoraproject.org/rpms/rust-url.git /var/lib/mock/f40-build-2040547-48365/root/chroot_tmpdir/scmroot/rust-url
Cloning into '/var/lib/mock/f40-build-2040547-48365/root/chroot_tmpdir/scmroot/rust-url'...
$ git fetch origin 36781a57cb6c1dcc4839f55f7846c8a0deeae525:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-url
 * [new ref]         36781a57cb6c1dcc4839f55f7846c8a0deeae525 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 36781a5 Update to version 2.4.1; Fixes RHBZ#2235305