This tool installs DA-built Nix distribution for MacOS X or Linux. It downloads the release from:

• http://hydra.da-int.net/jobset/nix/release-3

Runtime prerequisites:

• uname, mktemp, tar, curl, awk to download and perform installation
• sudo needed if and only if /nix/store is not present or is not owned by the current user.

Notes:

• the script checks for High Sierra induced failure of Nix and would reinstall Nix installation automatically in this case.

This tool is meant to be run from a root account and precache all relevant dev-env provided tools on a given machine. It finds the right user to impersonate and downloads most recently built tools from hydra.da-int.net.

Runtime prerequisites:

• Nix installed in a single-user mode (e.g. via dade-nix-install)
• uname and awk to detect OS and architecture
• sudo to perform the prefetch from under the owner of the /nix/store

It is used to preload dev-env caches on developers workstations. A developer can create a file which would disable the automatic precaching:

touch $HOME/.dade-raw-preload.skip

Note: downloaded tools are not added to Nix garbage collection roots, hence will get deleted with next nix-collect-garbage invocation.

Non-code dependencies:

• Hydra jobsets
  • http://hydra.da-int.net/jobset/da/master-dade-linux
  • http://hydra.da-int.net/jobset/da/master-dade-darwin
  • http://hydra.da-int.net/jobset/da/dev-env-next-dade-linux
  • http://hydra.da-int.net/jobset/da/dev-env-next-dade-darwin

Used by:

• Casper policy to deploy jobs (owned by Edward Newman) -- based of https://github.com/DACH-NY/da/blob/master/dev-env/bin/download-dade-service-script.sh

Tested by:

• https://github.com/DACH-NY/da/pipeline/jenkins/src/jobs/pipeline/dev-env/dadeRawPreload.Jenkinsjob
• http://ci.da-int.net/job/pipeline/job/dev-env/job/dade-raw-preload/

Implementation sketch:

• finds out the Nix store owner;
• checks for the skip file;
• finds the user's Nix profile and sources it;
• creates a temporary nix.conf to ensure hydra.da-int.net is used;
• sets up a temporary nix-shell with required tools (e.g. jq);
• fetches all store paths from all last evaluations of all jobsets;
• downloads them (aka "realizes" with nix-store -r).

Once the dev-env is set up (either through direnv (recommended), or through manually sourcing one of dev-env/profile_{z,ba}sh.sh), the shell's PATH will look through dev-env/bin first for its executables. The executables in there are mostly scripts that redirect the call to the corresponding nix-built executable. However, having that script gives us an opportunity to wrap some of those commands in special ways; this section is meant to document in what ways the commands available in dev-env/bin have been modified from their vanilla variants.