Problems with custom snapshots

[Mark Fine]

Thanks for 1.6.1! I'm super excited about using custom snapshots, but ran into some issues with a couple of projects with particular dependencies not being handled properly. I took a working project and wrapped the lts resolver in a custom snapshot with nothing else:

--- a/stack-lts-6.yaml

+++ b/stack-lts-6.yaml

@@ -1,4 +1,4 @@

-resolver: lts-6.35

+resolver: https://github.com/swift-nav/stack-snapshots/raw/0.0.2/minimal-snapshot-lts-6.yaml

 packages:

 - .

where minimal-snapshot-lts-6.yaml contains:

resolver: lts-6.35

name: snapshot-lts-6

This trips up the build consistently on a couple of packages (http2, vector-algorithms):

--  While building custom Setup.hs for package http2-1.6.2 using:

      /home/travis/.stack/setup-exe-cache/x86_64-linux/Cabal-simple_mPHDZzAJ_1.22.5.0_ghc-7.10.3 --builddir=.stack-work/dist/x86_64-linux/Cabal-1.22.5.0 configure --with-ghc=/home/travis/.stack/programs/x86_64-linux/ghc-7.10.3/bin/ghc --with-ghc-pkg=/home/travis/.stack/programs/x86_64-linux/ghc-7.10.3/bin/ghc-pkg --user --package-db=clear --package-db=global --package-db=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/pkgdb --libdir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/lib --bindir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/bin --datadir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/share --libexecdir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/libexec --sysconfdir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/etc --docdir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/doc/http2-1.6.2 --htmldir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/doc/http2-1.6.2 --haddockdir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/doc/http2-1.6.2 --dependency=array=array-0.5.1.0-960bf9ae8875cc30355e086f8853a049 --dependency=base=base-4.8.2.0-0d6d1084fbc041e1cded9228e80e264d --dependency=bytestring=bytestring-0.10.6.0-9a873bcf33d6ce2fd2698ce69e2c1c66 --dependency=bytestring-builder=bytestring-builder-0.10.6.0.0-8aa4073730c676dbe210ea8bffd8d092 --dependency=case-insensitive=case-insensitive-1.2.0.10-2710882b4f658c001bb72a067083a3a8 --dependency=containers=containers-0.5.6.2-59326c33e30ec8f6afd574cbac625bbb --dependency=psqueues=psqueues-0.2.2.3-742bdf37b7dba2a5239a54cba5b43cc7 --dependency=stm=stm-2.4.4.1-7050c728ed5b2315e2c6b56d8bf9837f

    Process exited with code: ExitFailure 1

    Logs have been written to: /home/travis/build/XXXXXX/.stack-work/logs/http2-1.6.2.log

    Configuring http2-1.6.2...

    Cabal-simple_mPHDZzAJ_1.22.5.0_ghc-7.10.3: At least the following dependencies

    are missing:

    aeson-pretty -any, hex -any

--  While building custom Setup.hs for package vector-algorithms-0.7.0.1 using:

      /home/travis/.stack/setup-exe-cache/x86_64-linux/Cabal-simple_mPHDZzAJ_1.22.5.0_ghc-7.10.3 --builddir=.stack-work/dist/x86_64-linux/Cabal-1.22.5.0 configure --with-ghc=/home/travis/.stack/programs/x86_64-linux/ghc-7.10.3/bin/ghc --with-ghc-pkg=/home/travis/.stack/programs/x86_64-linux/ghc-7.10.3/bin/ghc-pkg --user --package-db=clear --package-db=global --package-db=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/pkgdb --libdir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/lib --bindir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/bin --datadir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/share --libexecdir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/libexec --sysconfdir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/etc --docdir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/doc/vector-algorithms-0.7.0.1 --htmldir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/doc/vector-algorithms-0.7.0.1 --haddockdir=/home/travis/.stack/snapshots/x86_64-linux/custom-snapshot-lts-6-l7MQXbzRraUj/7.10.3/doc/vector-algorithms-0.7.0.1 --dependency=base=base-4.8.2.0-0d6d1084fbc041e1cded9228e80e264d --dependency=bytestring=bytestring-0.10.6.0-9a873bcf33d6ce2fd2698ce69e2c1c66 --dependency=primitive=primitive-0.6.1.0-b2a7b9f8d5591c0d4ce7ef238a3217d2 --dependency=vector=vector-0.11.0.0-299aefb173ce5a731565d31f609a0cfd

    Process exited with code: ExitFailure 1

    Logs have been written to: /home/travis/build/XXXXXX/.stack-work/logs/vector-algorithms-0.7.0.1.log

    Configuring vector-algorithms-0.7.0.1...

    Cabal-simple_mPHDZzAJ_1.22.5.0_ghc-7.10.3: At least the following dependencies

    are missing:

    mwc-random -any

Is there something I can do to help troubleshoot the issue here? Or alleviate it? Unfortuantely, still on lts-6 until lts-10 comes out. Thanks for any help figuring out this issue!

Mark

[Michael Snoyman]

I know this bug :(. It's an old Cabal bug, where build-depends for non-buildable components are still required. When dealing with older Cabal libraries, we need to make sure those libraries are available, even though they aren't needed. This isn't custom snapshot specific, you can reproduce by wiping out the package database for lts-6.35 and running:

    $ stack build vector-algorithms  --resolver lts-6.35

Error message at: https://gist.github.com/snoyberg/1849947fbfc53037a70fb29456030feb

Can you open an issue on the tracker for this? We should work around this to keep compatibility with old Cabal versions. As far as workarounds, there are two:

1. As you imply: updating to a newer LTS which includes a Cabal version with the bug fix will work around this

2. Manually install the missing packages: stack build mwc-random aeson-pretty hex

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[Michael Snoyman]

Option 3: try out this PR :)

https://github.com/commercialhaskell/stack/pull/3632

[Mark Fine]

Thanks Michael!

I was able to workaround the issue by installing the dependencies independently. These custom snapshots are great!

Mark

[Michael Snoyman]

Awesome, glad to hear it's working.