feat: fixBin accept exec mode as optional parameter

[vagusX]

There are some bin js file is using CRLF, and they cannot work with yarn/npminstall, but they can work with npm, due to fixBin would try to fix.

So if this package exports isWindowsHashbangFile and dos2Unix, we can pr to yarn/npminstall to reuse the logic removing windows line-endings on the hashbang line.

And about not just using the fixBin directly, because yarn/npminstall/pnpm doesnot set the same chmod here, they set 0o755, but bin-links set 0o777.

• https://github.com/yarnpkg/yarn/blob/ba0a33b7dc513d262bce505d9446d18a173a839c/src/package-linker.js#L44
• https://github.com/vagusX/npminstall/blob/43fb55a2bf55a8083eef40b6a53a893198185aee/lib/bin.js#L42
• https://github.com/pnpm/pnpm/blob/58edad730758df622fcf5a15abc1af4a5a0ff9a0/packages/link-bins/src/index.ts#L200

References

• Windows Line Ending causes error yarnpkg/yarn#7173
• Wrong line endings after installation yarnpkg/yarn#5480

Some issues from those packages:

• Bug: /usr/bin/env: ‘node\r’: No such file or directory docsifyjs/docsify-cli#78 (comment)
• env: node\r: No such file or directory preactjs/preact-cli#1431
• Version: 0.12.0. /usr/bin/env: ‘node\r’: No such file or directory  facebook/jscodeshift#424 (comment)

[wraithgar]

Perhaps a more robust fix would be to allow you to set the permissions fix-bin uses, so that you can start using it?

[vagusX]

@wraithgar got it, updated