bobvanderlinden

devenv git+python regression

This is an example where devenv+python will fail when the git binary from the system is based on an older libc than the libc that is used in devenv. The system git is provided here by nix develop . to simulate an older system.

$ nix develop .
# This loads an older version of git (based on an older libc).
$ devenv shell
# This uses python to run `pip install -r requirements.txt` and will try to clone a git repository from there.
# Python uses a newer libc, which is passed through to subprocesses using `LD_LIBRARY_PATH` to `git`. `git` cannot run because of an incompatible libc.

bobvanderlinden

Add to the top of devenv.yaml:

# yaml-language-server: $schema=<url/path to devenv.schema.json>

bobvanderlinden

When working on a merge/pull request and want your Git commit history to look nice afterwards, you often need to rename commit messages. For larger merge/pull requests you might need to rename a bunch of them.

The git rebase interactive reword command comes close, but it only allows you to change commit messages one by one in sequence, instead of changing the messages in an editor in one go.

Below is the most practical way of rewriting the commit messages I have found. It uses git interactive rebase, vscode and multiple cursors.

Note that the method below doesn't work for multiline commit messages!

bobvanderlinden

FROM ubuntu
RUN apt-get update
RUN apt-get -y install netcat
CMD nc -zv -w 1 $ADDRESS 8888

bobvanderlinden

node --eval 'require("http").createServer((req, res) => { res.end(); console.log(req.method, req.url, req.rawHeaders); }).listen(8080)'

bobvanderlinden

local function matches(input, pattern)
  local index = 1
  return function()
    local match = input:match(pattern, index)
    if match then
      index = index + match:len() + 1
      return match
    else
      return nil
    end

bobvanderlinden

This is an example how to do GraphQL queries in a somewhat sane way in bash using curl and jq.

The example does an query towards GitHub to fetch the commit SHAs of open pull requests for a specific repository.

The example needs the environment variables REPO_OWNER, REPO_NAME and GITHUB_TOKEN to be set.

bobvanderlinden

This script is handy for setting up an ad-hoc DHCP server for instance when starting up a Raspberry PI for the first time. dnsmasq will output when it has given a client an address:

dnsmasq-dhcp: DHCPACK(enp0s25) 192.169.1.109 b8:27:eb:86:2f:ed nixos

bobvanderlinden

these derivations will be built:
  /nix/store/30fribf3xpmiivys1mzqp007m70p4h4v-node-v11.0.0.tar.xz.drv
  /nix/store/k1ww35ij6c9r0vxxrqpmid1lpmhpq3zm-nodejs-11.0.0.drv
these paths will be fetched (95.06 MiB download, 553.67 MiB unpacked):
  /nix/store/0ingn8cwwnl84i374hcl6nafsm2c5m2p-perl-5.28.0
  /nix/store/0pcxv5mzn1fz7z8aa1frczkm4gpy7dkc-libgcrypt-1.8.3
  /nix/store/10yq7kwlvbc6h658izmrlsspry1g9f3c-gcc-wrapper-7.3.0
  /nix/store/1vb4m694aj9bdm7aq3911yjjb73gn4ii-attr-2.4.47
  /nix/store/22zwmxhd41a1j3cf7rxjwd75w4hmxdrv-libev-4.24
  /nix/store/2brlr94ahy3a9mvcjy0qbqpv8zrb7b7s-python-2.7.15

bobvanderlinden

Use the following to generate gemset.nix:

nix run nixpkgs.bundix --command bundix

Then run:

nix-shell