Lisanna LisannaAtHome

Lisanna's eclectic nix troubleshooting guide for suicidal power users

tar fails with exit code 1

unpacking 'https://example.com/nixexprs.tar.xz'...
tar: Error opening archive: Failed to open '/nix/store/411sszfqfya5ad2wllmqcr15z5d30575-nixexprs.tar.xz'
error: program 'tar' failed with exit code 1

Discussion:

I created these small git commands to help make exploring commits and editing them easier.

The first set of commands, git uc (Undo Commit) and git rc (Redo Commit), will undo a commit while saving the commit message and keeping the changes staged, so you can make changes to the commit and re-perform the commit while having the original commit message restored. Example:

$ git uc
...make edits to staged changes...
$ git rc
...update commit message, original one is loaded into editor...

	{ config, pkgs, ... }:
	let
	myCustomChannel = import <myCustomChannel>
	{ inherit pkgs; };
	in {
	imports = [ (import <myCustomChannel/myCustomModule.nix> { inherit myCustomChannel; }) ];
	}

	{
	fixup = options: name: file: stdenvNoCC.mkDerivation
	( options //
	{ inherit name;
	installPhase =
	''cp -r ${file} $out
	'';
	}
	);
	wrap = { paths ? [], vars ? {}, file ? null, script ? null, name ? "wrap" }:

	# This program is free software: you can redistribute it and/or modify
	# it under the terms of the GNU General Public License as published by
	# the Free Software Foundation, either version 3 of the License, or
	# (at your option) any later version.
	#
	# This program is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#

	#! /usr/bin/env bash

	NIX_STORE=${NIX_STORE:-"/nix/store"};
	store_path=$1;

	# check if path is actually broken
	if nix-store --verify-path $store_path; then exit 0; fi;

	# abuse --check flag to get a fresh, non-substituted rebuild of the path
	# TODO: GC?

	#!/usr/bin/env bash
	nix-env -ir -E "args: (import <nixpkgs> {}).lib.toDerivation $1"

	#!/usr/bin/env bash

	git log --format=%B -n 1 HEAD > ._GIT_EXTRACT_MSG && git reset --soft HEAD^ && git reset HEAD && git commit --allow-empty -F ._GIT_EXTRACT_MSG && rm ._GIT_EXTRACT_MSG