$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo-config2.git /var/lib/mock/f40-build-2701556-70452/root/chroot_tmpdir/scmroot/rust-cargo-config2
Cloning into '/var/lib/mock/f40-build-2701556-70452/root/chroot_tmpdir/scmroot/rust-cargo-config2'...
$ git fetch origin e79b1adc42dd0cfd87934d8be654506d5dca882e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo-config2
 * [new ref]         e79b1adc42dd0cfd87934d8be654506d5dca882e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e79b1ad Update to version 0.1.23; Fixes RHBZ#2270420