$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo-config2.git /var/lib/mock/f40-build-2607914-63689/root/chroot_tmpdir/scmroot/rust-cargo-config2
Cloning into '/var/lib/mock/f40-build-2607914-63689/root/chroot_tmpdir/scmroot/rust-cargo-config2'...
$ git fetch origin bb57525a6492193f707e96f242f6c0aff22e00b6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo-config2
 * [new ref]         bb57525a6492193f707e96f242f6c0aff22e00b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb57525 Update to version 0.1.19; Fixes RHBZ#2263663