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Michael Peyton Jones 07f363fae3
cleanSourceWith: don't use baseNameOf
Currently, not providing `name` to `cleanSourceWith` will use the name
of the imported directory. However, a common case is for this to be the
top level of some repository. In that case, the name will be the name of
the checkout on the current machine, which is not necessarily
reproducible across different settings, and can lead to e.g. cache
misses in CI.

This is documented in the comment on `cleanSourceWith`, but this does
not stop it being a subtle trap for users.

There are different tradeoffs in each case:

1. If `cleanSourceWith` defaults to `"source"`, then we may end up with a
user not knowing what directory a source store path corresponds to.
However, it being called "unnamed" may give them a clue that there is a
way for them to name it, and lead them to the definition of the
function, which has a clear `name` parameter.

2. If `cleanSoureWith` defaults to the directory name, then a user may face
occasional loss of caching, which is hard to notice, and hard to track
down. Tracking it down likely requires use of more advanced tools like
`nix-diff`, and reading the source of a lot of nix code.

I think the downside of the status quo is worse.

This is really another iteration of
https://github.com/NixOS/nix/issues/1305: that led to adding the `name`
argument in the first place, this just makes us use a better default
`name`.
2020-03-23 09:53:07 +00:00
.github Merge pull request #77806 from softinio/update-codeowners 2020-01-29 02:51:17 -05:00
doc doc: python: fixing mistake in venv example 2020-02-02 09:39:58 -08:00
lib cleanSourceWith: don't use baseNameOf 2020-03-23 09:53:07 +00:00
maintainers maintainers: Add Atemu to the list 2020-02-07 20:59:13 +01:00
nixos Merge pull request #79300 from jtojnar/default-wm-fix 2020-02-08 21:28:14 -05:00
pkgs linux config: revert BPF_JIT_ALWAYS_ON=yes 2020-02-09 08:22:00 +01:00
.editorconfig Revert ".version: remove final newline" 2018-04-28 14:23:13 +02:00
.gitattributes gitattributes: disable merge=union in all-packages 2018-03-27 11:03:03 -05:00
.gitignore Replace androidenv by new implementation 2018-12-18 21:16:06 +01:00
.version 20.03 is Markhor 2019-09-09 11:26:58 -04:00
COPYING COPYING: include 2020 2020-01-11 15:17:22 -08:00
default.nix Fix local path to release notes in error message 2018-10-08 05:43:15 -05:00
README.md README.md: fix typos 2019-12-31 15:29:54 +00:00

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