#5977: Allow ignoring global package db
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Reporter: duncan | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler
Version: 7.4.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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For sandboxing, users want to be able to use only local package dbs. To
handle rts, base etc, they copy those specific packages from the global
package db into a local package db.
Currently however there is no sensible way to tell ghc to look '''only'''
at the listed package dbs, and not the global db. There is a flag `-no-
user-package-conf` to avoid looking at the per-user one, but no equivalent
to ignore or to specify the global one.
(Note: as a quirky non-sensible way, you can use `GHC_PACKAGE_PATH=""` to
clear the package db stack, but this should be possible using command line
flags.)
The user interface we're now using in cabal is like this:
* `--global` sets the initial db stack to `[GlobalPackageDB]`
* `--user` sets the initial db stack to `[GlobalPackageDB,
UserPackageDB]`
* `--package-db=clear` clears the db stack to `[]`
* `--package-db=global` pushes `GlobalPackageDB` on the top of the stack
* `--package-db=user` pushes `UserPackageDB` on the top of the stack
* `--package-db=`''${otherfile}'' pushes `SpecificPackageDB`
''${otherfile}'' on the top of the stack
It seems to me we could do something similar with ghc. Currently in ghc we
have a `-hide-all-packages` flag that resets the package set to empty. We
could do with an equivalent for the package database stack. I suggest
something like:
* `-clear-package-conf`
* `-global-package-conf`
* `-user-package-conf` (and the existing `-no-user-package-conf`)
* `-package-conf` file
The default would remain that the global and user dbs are used, but this
can be reset using `-clear-package-conf`.
Personally I prefer the nomenclarture "package db" rather than "package
conf" here, but it's not that important.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5977>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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