Factor out lookupExecutable and other PATH improvements
#11218
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lookupExecutable and other PATH improvments
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| #ifdef WIN32 | ||
| # define PATH_VAR_SEP ";" | ||
| #else | ||
| # define PATH_VAR_SEP ":" | ||
| #endif |
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Do we need to do this again, when executable-path.cc already has the (weirdly capitalized) pATH_separator?
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I did something similar for unit tests before, I don't mind having the unit tests have their own redundant one-off definition just for a bit of spec vs implementation separation purposes.
src/libutil/executable-path.cc
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| std::vector<fs::path> parsePATH(const OsString & path) | ||
| { | ||
| auto strings = basicTokenizeString<std::list<OsString>, OsString::value_type>(path, pATH_separator); |
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I punted on the path lookup case (with an assert, documented of course) (as opposed to name look up case) since I am not sure sort of error message we want to do, and as it turns out in most cases we are just looking up statically known names.
This brings us back into compliance. I think just in the next PR, for the build hook, we look up a dynamic choice. So we can see what we want to do then.
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This pull request has been mentioned on NixOS Discourse. There might be relevant details there: https://discourse.nixos.org/t/2024-07-31-nix-team-meeting-minutes-166/49972/1 |
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lookupExecutable and other PATH improvmentslookupExecutable and other PATH improvements
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#11178 (comment) Naming question about "OS" vs "Native" that needs to be resolved. |
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This ended up motivating a good deal of other infra improvements in order to get Windows right: - `OsString` to complement `std::filesystem::path` - env var code for working with the underlying `OsString`s - Rename `PATHNG_LITERAL` to `OS_STR` - `NativePathTrait` renamed to `OsPathTrait`, given a character template parameter until NixOS#9205 is complete. Split `tests.cc` matching split of `util.{cc,hh}` last year. Co-authored-by: Robert Hensing <[email protected]>
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| auto s2 = v.render(); | ||
| EXPECT_EQ(s2, OS_STR("." PATH_VAR_SEP "." PATH_VAR_SEP "." PATH_VAR_SEP ".")); | ||
| } | ||
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It'd be nice to use the isExecutableFile parameter to add a (pure) unit test here.
The test could use a lambda that returns true for a fixed set of paths.
| // "If the pathname being sought contains a <slash>, the search | ||
| // through the path prefixes shall not be performed." | ||
| // https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08_03 | ||
| assert(OsPathTrait<fs::path::value_type>::rfindPathSep(exe) == exe.npos); |
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I think they mean to just return exe so that it's later resolved relative to the working directory.
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I am pretty sure shells do not let you run things in the current directory without ./ as a safety feature? But yeah that is probably extra effort on their part. Regardless, the other find function in the next commit will always return something.
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That is correct, but it doesn't mean that a command with a slash is wrong.
$ (export PATH=/foo; cd result/bin; hello ; )
hello: command not found
$ (export PATH=/foo; result/bin/hello ; )
Hello, world!other find function in the next commit
Doesn't seem to be part of this PR.
I don't think this assertion is useful. The lack of a directory separator is easily observed in the string literals that we tend to pass to this function.
Co-authored-by: Robert Hensing <[email protected]>
Motivation
This ended up motivating a good deal of other infra improvements in order to get Windows right.
Contains some other mics Windows/Meson fixes because there were regressions.
Context
Good for Windows support in general, also buttresses #11178 slightly.
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