$ git clone -n https://src.fedoraproject.org/rpms/rust.git /var/lib/mock/f41-build-side-1-2934389-35233/root/chroot_tmpdir/scmroot/rust
Cloning into '/var/lib/mock/f41-build-side-1-2934389-35233/root/chroot_tmpdir/scmroot/rust'...
$ git fetch origin 57f6a22eeaa0aab106739e427ed42a27573e0109:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust
 * [new ref]         57f6a22eeaa0aab106739e427ed42a27573e0109 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57f6a22 Require rust libraries for rust-analyzer; Fixes RHBZ#2316529