How to create a symlink with Haskell? The directory package to my knowledge does not provide a way to do it.
Asked
Active
Viewed 792 times
5
Mark Karpov
- 7,499
- 2
- 27
- 62
-
3[System.Posix.Files.createSymbolicLink](https://hackage.haskell.org/package/unix-2.7.2.0/docs/System-Posix-Files.html#g:9) – n. m. could be an AI May 11 '16 at 05:20
-
@n.m. Feel free to post as an answer, unless a duplicate question already exists. – Mark Karpov May 11 '16 at 05:23
-
Apparently there's a (near) duplicate [here](http://stackoverflow.com/questions/35369470/what-is-the-command-to-create-a-soft-link-with-haskell-turtle). – n. m. could be an AI May 11 '16 at 05:37
-
@n.m. I think this question will be easier to find via search engines, I think we should keep this one. – Mark Karpov May 11 '16 at 05:43
-
@Mark: Closing as a duplicate won't delete this question. Instead, it will still come up in search engines. (By the way, I knew I answered this question already somewhere :D) – Zeta May 11 '16 at 07:02
2 Answers
10
Creating a symbolic link is non-portable. For example, the creation symbolic links on Windows is restricted1. Therefore it does not fit into directory providing "a basic set of operations for manipulating files and directories in a portable way" (emphasis mine). This affects all platform independent packages.
The platform specific package unix provides that functionality in System.Posix.Files with createSymbolicLink though:
import System.Posix.Files (createSymbolicLink)
main :: IO ()
main = createSymbolicLink "/opt/ghc/7.10.3" "/opt/ghc/active"
1: That's also a reason why unix-compat does not implement createSymbolicLink
0
createFileLink :: FilePath -> FilePath -> IO ()
This is supposed to work even on Windows – only on a suitable file system, of course.
leftaroundabout
- 117,950
- 5
- 174
- 319