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8573 34435a9502 redshift: Fix default value of $DISPLAY (#17746) 
Before commit 54fa0cfe4e, the `redshift`
service was run with the environment variable `DISPLAY` set to `:0`.

Commit 54fa0cfe4e changed this to
instead use the value of the `services.xserver.display` configuration
option in the value of the `DISPLAY` variable. In so doing, no default
value was provided for the case where `services.xserver.display` is
`null`.

While the default value of `services.xserver.display` is `0`, use of
which by the `redshift` module would result in `DISPLAY` again being
set to `:0`, `services.xserver.display` may also be `null`, to which
value it is set by, e.g., the `lightdm` module.

In the case that `services.xserver.display` is `null`, with the change
made in commit 54fa0cfe4e, the `DISPLAY`
variable in the environment of the `redshift` service would be set to
`:` (a single colon), which, according to my personal experience,
would result in —

  - the `redshift` service failing to start; and

  - systemd repeatedly attempting to restart the `redshift` service,
    looping indefinitely, while the hapless `redshift` spews error
    messages into the journal.

It can be observed that the malformed value of `DISPLAY` is likely at
fault for this issue by executing the following commands in an
ordinary shell, with a suitable `redshift` executable, and the X11
display not already tinted:

  - `redshift -O 2500` — This command should reduce the color
    temperature of the display (making it more reddish).

  - `DISPLAY=':' redshift -O 6500` — This command should raise the
    color temperature back up, were it not for the `DISPLAY`
    environment variable being set to `:` for it, which should cause
    it to, instead, fail with several error messages.

This commit attempts to fix this issue by having the `DISPLAY`
environment variable for the `redshift` service default to its old
value of `:0` in the case that `services.xserver.display` is `null`.

I have tested this solution on NixOS, albeit without the benefit of a
system with multiple displays.
2016-08-17 13:34:26 +02:00
.github PR template: go back to old option name for now 2016-06-29 21:44:05 +02:00
doc Doc: fix python examples 2016-08-16 09:47:13 +02:00
lib visualvm: init at 1.3.8 (#17745) 2016-08-15 05:45:48 +02:00
maintainers travis: build stdenv also 2016-08-13 15:34:57 -05:00
nixos redshift: Fix default value of $DISPLAY (#17746) 2016-08-17 13:34:26 +02:00
pkgs bitwig-studio: init at 1.3.12 (#17756) 2016-08-17 13:23:48 +02:00
.gitignore kde5: consolidate packages into desktops/kde-5 2016-03-01 10:36:00 -06:00
.mention-bot Blacklist jhasse 2016-03-05 23:23:19 +01:00
.travis.yml nox: add git as build input 2016-07-29 20:54:02 -05:00
.version as always, no newline in .version 2016-02-28 23:39:38 +00:00
COPYING
default.nix Separate fix-point from config importing hacks and other impurities 2016-07-14 14:33:23 -07:00
README.md README.md: add code triagers badge 2016-07-22 15:00:55 +02:00

README.md

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Build Status Code Triagers Badge Issue Stats Issue Stats

Nixpkgs is a collection of packages for the Nix package manager. It is periodically built and tested by the hydra build daemon as so-called channels. To get channel information via git, add nixpkgs-channels as a remote:

% git remote add channels git://github.com/NixOS/nixpkgs-channels.git

For stability and maximum binary package support, it is recommended to maintain custom changes on top of one of the channels, e.g. nixos-16.03 for the latest release and nixos-unstable for the latest successful build of master:

% git remote update channels
% git rebase channels/nixos-16.03

For pull-requests, please rebase onto nixpkgs master.

NixOS linux distribution source code is located inside nixos/ folder.

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