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let 
  overlay = self: super: rec {
    my-hello = super.callPackage ./pkgs/hello/default.nix {};
    hello = if super.hello.version > my-hello.version then super.hello else my-hello;
  };
  unstable = import <nixos-unstable> {
    overlays = [ overlay ];
    config = { };
  };
in 

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ffi = require "ffi"
null = ffi.new("void*", nil)

print("not null: ", not null)
print("null == nil: ", null == nil)

--- Prints:
--
-- not null:     false
-- null == nil:  true

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$ pwd
/lib
$ ls -alh os-release 
lrwxrwxrwx. 1 root root 37 Nov 29 13:34 os-release -> ./os.release.d/os-release-workstation
$ x=os-release
$ echo "${x:A}"
/usr/lib/os.release.d/os-release-workstation
$ echo "${x:a}"
/usr/lib/os-release

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//! If you're on a Unix system, try something like:
//!
//! `yes | cargo run --example count_keys`
//!
//! (Originally from
//! https://github.com/paulkernfeld/tokio-stdin/blob/master/examples/count_keys.rs)
extern crate futures;
extern crate tokio_stdin;
extern crate tokio_timer;

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#!/bin/bash

[ $UID == 0 ] || (echo "Must be root" && exit 1)

# c1 and c2 represent two different docker containers starting at once
c1=1
c2=2

function ovlOpts() {
	echo -n "lowerdir=$tmpdir/lower,upperdir=$tmpdir/$1/diff,workdir=$tmpdir/$1/work"

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#!/bin/bash

set -e

tag=${1:?arg should be a docker-ce tag, such as 'v17.07.0-ce'}

tmp=$(mktemp -d)
cd $tmp

wget https://raw.githubusercontent.com/shykes/moby-extras/master/cmd/moby-components

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$ git checkout v1.7.1
$ echo "/vendor" > .ignore
$ rg '^//.*\+.*build' --no-filename -N | sort | uniq -c | sort -nr
    211 // +build !ignore_autogenerated
     44 // +build linux
     23 // +build !linux
     12 // +build windows
      5 // +build !windows
      5 // +build !linux,!windows
      5 // +build cgo,linux

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#!/bin/bash
set -euo pipefail

for i in $(seq 1 20); do
	mkdir "fetch-$i"
	pushd "fetch-$i"
	../bin/docker2aci docker://euank/manylabels:busybox
	sudo rkt fetch --insecure-options=image *.aci > sha
	sudo rkt image cat-manifest $(cat sha) > rktmanifest
	cat *.aci | gunzip | tar x

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#cloud-config
users:
 - name: "core"
 - passwd: "***"

# The formatting of the following section is important. Don't change it!
# sytemd-networkd and dhcpcd are both packaged in Container Linux. We'll use systemd
# because that's what's used in the most minimal, out-of-the-box config at this time,
# and dhcpcd is disabled. We're giving systemd a dhcp config file so we can tell it
# to not use IPv6 privacy extensions. We also need DHCP=ipv4 b/c DHCP=all causes

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-rwxr-xr-x 117 root root  2.0M Apr 26 14:06 /usr/bin/git
-rwxr-xr-x 117 root root  2.0M Apr 26 14:06 /usr/bin/git-receive-pack
-rwxr-xr-x 117 root root  2.0M Apr 26 14:06 /usr/bin/git-upload-archive
-rwxr-xr-x 117 root root  2.0M Apr 26 14:06 /usr/libexec/git-core/git
-rwxr-xr-x 117 root root  2.0M Apr 26 14:06 /usr/libexec/git-core/git-add
-rwxr-xr-x 117 root root  2.0M Apr 26 14:06 /usr/libexec/git-core/git-am
-rwxr-xr-x 117 root root  2.0M Apr 26 14:06 /usr/libexec/git-core/git-annotate
-rwxr-xr-x 117 root root  2.0M Apr 26 14:06 /usr/libexec/git-core/git-apply
-rwxr-xr-x 117 root root  2.0M Apr 26 14:06 /usr/libexec/git-core/git-archive
-rwxr-xr-x 117 root root  2.0M Apr 26 14:06 /usr/libexec/git-core/git-bisect--helper