[THRIFT-4634] Haskell builds with older cabal cannot reconcile complex version requirements

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.11.0
• Fix Version/s: 0.12.0
• Component/s: Build Process, Haskell - Library
• Assignee: James E. King III
• Reporter: James E. King III
• Created: 14/Sep/18 17:06
• Updated: 27/Dec/18 15:25
• Resolved: 15/Sep/18 13:43

Description

The cabal version in Ubuntu Xenial is 1.22.6.0 and it has been failing on CI since HTTP-4000 changed to allow "network < 2.8" - the resulting output is:

root@48ae26f5e4f3:/thrift/src/lib/hs# make
/usr/bin/cabal update
Downloading the latest package list from hackage.haskell.org
Skipping download: Local and remote files match.
/usr/bin/cabal install
Resolving dependencies...
cabal: Could not resolve dependencies:
trying: thrift-1.0.0 (user goal)
trying: network-2.8.0.0 (dependency of thrift-1.0.0)
trying: HTTP-4000.3.12 (dependency of thrift-1.0.0)
trying: HTTP-4000.3.12:-conduit10
trying: HTTP-4000.3.12:-mtl1
rejecting: HTTP-4000.3.12:+network-uri (conflict: network==2.8.0.0,
HTTP-4000.3.12:network-uri => network>=2.6 && <2.8)
rejecting: HTTP-4000.3.12:-network-uri (conflict: network==2.8.0.0,
HTTP-4000.3.12:network-uri => network>=2.2.1.8 && <2.6)
Backjump limit reached (change with --max-backjumps).
Makefile:639: recipe for target 'all-local' failed
make: *** [all-local] Error 1

thrift has no direct dependency on network 2.8.0.0 - why it is being selected first is beyond me. It should back off to 2.7.0.2 once it sees the network-uri set of dependencies. It looks like the cabal in Ubuntu Bionic doesn't have this problem.

Issue Links

• links to: GitHub Pull Request #1594