phantomjs2: set QT_QPA_PLATFORM to allow use in daemons

[lukeadams]

resolves issues with Grafana alert image attachments

Suggested in ariya/phantomjs#15217 (comment)

Grafana logs showed this:

Jan 19 22:20:42 elastomer grafana-server[3418]: QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-grafana'
Jan 19 22:20:42 elastomer grafana-server[3418]: qt.qpa.screen: QXcbConnection: Could not connect to display
Jan 19 22:20:42 elastomer grafana-server[3418]: Could not connect to any X display.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

---

[lukeadams]

Better is to wait for phantomjs v2.1.3 which includes internal fix ariya/phantomjs@db349b4

I'll leave this open since I have no idea how long until 2.1.3 is released

if anybody hits the issue though the commit in this PR can be cherry picked

[grahamc]

@GrahamcOfBorg build phantomjs2

[GrahamcOfBorg]

Success for system: x86_64-linux

post-installation fixup
shrinking RPATHs of ELF executables and libraries in /nix/store/bpjpk19hzfhxx1zqahiah0nldr1v75m7-phantomjs-2.1.1
shrinking /nix/store/bpjpk19hzfhxx1zqahiah0nldr1v75m7-phantomjs-2.1.1/bin/.phantomjs-wrapped
strip is /nix/store/mdyy001q67hiks0g24ra53z7ckm4jfr4-binutils-2.28.1/bin/strip
stripping (with command strip and flags -S) in /nix/store/bpjpk19hzfhxx1zqahiah0nldr1v75m7-phantomjs-2.1.1/bin 
patching script interpreter paths in /nix/store/bpjpk19hzfhxx1zqahiah0nldr1v75m7-phantomjs-2.1.1
checking for references to /tmp/nix-build-phantomjs-2.1.1.drv-0 in /nix/store/bpjpk19hzfhxx1zqahiah0nldr1v75m7-phantomjs-2.1.1...
postPatchMkspecs
postPatchMkspecs
/nix/store/bpjpk19hzfhxx1zqahiah0nldr1v75m7-phantomjs-2.1.1

[GrahamcOfBorg]

Success for system: aarch64-linux

post-installation fixup
shrinking RPATHs of ELF executables and libraries in /nix/store/m40gy35d88nz4s9cknfnqpkzsvdbf93y-phantomjs-2.1.1
shrinking /nix/store/m40gy35d88nz4s9cknfnqpkzsvdbf93y-phantomjs-2.1.1/bin/.phantomjs-wrapped
strip is /nix/store/jwz859pxqj7sl2dbwvmxkx68jp774izb-binutils-2.28.1/bin/strip
stripping (with command strip and flags -S) in /nix/store/m40gy35d88nz4s9cknfnqpkzsvdbf93y-phantomjs-2.1.1/bin
patching script interpreter paths in /nix/store/m40gy35d88nz4s9cknfnqpkzsvdbf93y-phantomjs-2.1.1
checking for references to /build in /nix/store/m40gy35d88nz4s9cknfnqpkzsvdbf93y-phantomjs-2.1.1...
postPatchMkspecs
postPatchMkspecs
/nix/store/m40gy35d88nz4s9cknfnqpkzsvdbf93y-phantomjs-2.1.1

[GrahamcOfBorg]

Failure for system: x86_64-darwin

cannot build derivation '/nix/store/3bz85dj54hys06ls0fs97qkf834wydzy-hook.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/skgxashafxad1cl9gfvqrbazv5m2k33b-qtsvg-5.10.0.drv': 2 dependencies couldn't be built
cannot build derivation '/nix/store/rxlvjn7fqh223264wwyirlpldygin11v-qtxmlpatterns-5.10.0.drv': 2 dependencies couldn't be built
cannot build derivation '/nix/store/px4nnajjnmzhrzgihq2gxjklf7vfd6h0-qtdeclarative-5.10.0.drv': 4 dependencies couldn't be built
cannot build derivation '/nix/store/nnz50r45pcl2qkjwnln6mh2pwwh8f8zh-qtmultimedia-5.10.0.drv': 3 dependencies couldn't be built
cannot build derivation '/nix/store/5vzsv5dw9bvgcyysc3b3ckpl0w8asrwg-qtsensors-5.10.0.drv': 3 dependencies couldn't be built
cannot build derivation '/nix/store/29iivkf5q5a0iivf6d969224bqgjf1q1-qtlocation-5.10.0.drv': 3 dependencies couldn't be built
cannot build derivation '/nix/store/8df9j7znk1dgzza1hpvh729rqkzbjx50-qtwebkit-5.9.1.drv': 5 dependencies couldn't be built
cannot build derivation '/nix/store/d9j10a178v2xfz80s2qiwc3skr3d70j3-phantomjs-2.1.1.drv': 3 dependencies couldn't be built
error: build of '/nix/store/d9j10a178v2xfz80s2qiwc3skr3d70j3-phantomjs-2.1.1.drv' failed

[lukeadams]

Looks like pjs has been failing on Darwin for ages

[Mic92]

Your fix can be removed then after the next upgrade of phantomjs.