$ git clone -n https://src.fedoraproject.org/rpms/rust-regex.git /var/lib/mock/f38-build-side-42-init-devel-1138453-30393/root/chroot_tmpdir/scmroot/rust-regex
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1138453-30393/root/chroot_tmpdir/scmroot/rust-regex'...
$ git fetch origin 0a61c6821fc5355a678bf6f7da9f078ee1b2edb3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-regex
 * [new ref]         0a61c6821fc5355a678bf6f7da9f078ee1b2edb3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a61c68 Ignore harmless test failures on 32-bit architectures