Nix integration improvements #4193
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Does this not require some changes in documentation? |
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It does, but I need it to build first! 😃 For some reason Travis won't run on my personal branch anymore... |
cabal2nix recently changed its generated expressions to read the IN_NIX_SHELL environment variable. Now we need to set this variable when calling nix-instantiate to produce the same result as calling nix-shell.
cabal only cares if it is running in a Nix shell that was started by another cabal process, so we should not read IN_NIX_SHELL; rather, we read a cabal-specific variable for that purpose.
Mention that we allow `shell.nix` or `default.nix`, the same as `nix-shell`.
I think it is the branch whitelist: Lines 7 to 15 in 19d9738 |
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Branches with corresponding PRs shouldn't be affected by the whitelist... |
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Travis does run on the PR, it just doesn't run on my personal clone anymore (unless I open a PR). That's why I opened this PR before it was really ready. It would be nice if the Travis web interface would indicate that the whitelist is blocking a branch... The branch still appeared in the web interface, so I was very confused why Travis would not build it. |
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The Nix expressions for Cabal and cabal-install are updated. Nix expressions are instantiated in a "fake" Nix shell to cope with environment impurities introduced by newer versions of cabal2nix. cabal looks at the
CABAL_IN_NIX_SHELLenvironment variable instead ofIN_NIX_SHELL; it was pointed out that cabal need not care if it is running insidenix-shellbecause we only care if we are running in a shell created by cabal.