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cabal-install should warn about common problem after installing progs #662

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bos opened this Issue May 24, 2012 · 2 comments

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bos commented May 24, 2012

(Imported from Trac #670, reported by @dcoutts on 2010-04-30)

There are a few common problems have when installing programs.

  • target bindir (or symlink-bindir) is not on the $PATH so they cannot run the program after installation.
  • target bindir is on the $PATH but the installed program is masked by the presence of the same named prog in a dir that is earlier on the $PATH. For example /usr/local/bin/cabal and ~/.cabal/bin/cabal, the latter might have just been installed but the earlier one will still be picked up.
  • the shell keeping a cache of name -> path and so not picking up a new program. Eg in the above example, even if ~/.cabal/bin/ comes first on the $PATH, if bash has the mapping cabal -> /usr/local/bin/cabal then it will not notice when ~/.cabal/bin/cabal is installed. The fix here is to run hash -r. The only time we might want to tell users to run hash -r is if the program did not previously exist and if it gets installed in a location that is earlier on the $PATH than an existing installed instance (which may thus be in the cache). Sadly we cannot query sh to find out what its cache holds.
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bos commented May 24, 2012

(Imported comment by @dcoutts on 2010-04-30)

The second one in particular is still tripping up a lot of users. See also #289. We should aim to make this a bit more automatic so that most users will not have to fiddle with the $PATH.

jsl commented Feb 24, 2015

I haven't really had a problem with this, and perhaps others haven't either since there is no activity since 2010. I propose closing - please re-open or create another ticket if this problem still exists.

/cc @tibbe

@tibbe tibbe closed this Feb 24, 2015

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