#14648: ghc-pkg does handle unitids -------------------------------------+------------------------------------- Reporter: lspitzner | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: ghc-pkg | Version: 8.2.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- I base the summary and the description on a single observation, see below. Sorry should this turn out to be a deduction too aggressive. == Assumed problem description New-style package-dbs can contain the same (package, version) entry multiple times, as entries are identified using an additional hash. I'll call the full identifier "unitId". The ghc-pkg interface seems to not support specifying full unitIds, i.e. "my-package-0.1.0.0-somehash" seems to be interpreted like "my-package-0.1.0.0-*". This is both a missing functionality and a bug: 1. many operations make sense per-unitId, not just per (package, version) 2. The fact that my-package-0.1.0.0-otherhash is unregistered by "ghc-pkg unregister my-package-0.1.0.0-somehash" is quite surprising. == Observation 1. Take a package-db containing the same (package, version) entry with two different hashes, e.g. - semigroupoids-5.2.1-2f552e489ce3109c2672606e2dc6e33c4f38174da930d5db0bb0dafbb4dccae8 - semigroupoids-5.2.1-e50d44ead36c6b8428c9417007cee15bd9cbe3a2906c19553366d94b15c2471e I suggest making a copy of some existing (cabal store) db. 2. call `ghc-pkg --package-db my-copy unregister semigroupoids-5.2.1-2f552e489ce3109c2672606e2dc6e33c4f38174da930d5db0bb0dafbb4dccae8` 3. test `ghc-pkg --package-db my-copy list semigroupoids-5.2.1` Expected result: `semigroupoids-5.2.1-e50d44ea..` is still registered Observed result: empty list == Impact This blocks the use-case of a garbage-collection for the global new-style package db "store". -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14648 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler