Use ghc-musl 9.6.2 docker image

[benz0li]

Some issues need to be resolved first.

[benz0li]

Resolved: jacobstanley/unix-compat#61

[benz0li]

Next Resolved: yesodweb/wai#925

[benz0li]

Next Resolved: haskell-servant/servant#1659

ℹ️ Waiting for a new version (0.19.2?) to be released: https://hackage.haskell.org/package/servant

[benz0li]

Build is failing at Checking that the binary is statically linked..., because it is not:

file "linux-arm64/pandoc"

linux-arm64/pandoc: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-musl-aarch64.so.1, stripped

– haskell-servant/servant#1659 (comment)

@jgm Did I miss a specific flag? I took the ones according to the Makefile and added --allow-newer to CABALOPTS.

[jgm]

See .cirrus.yml. I'm building the linux releases on cirrus-ci.com, now.
That config file contains the settings you need for GHCOPTS and CABALOPTS.

[benz0li]

@jgm Then, pandoc can currently be built from branch main with GHC 9.6.1 as follows:

git clone https://github.com/jgm/pandoc.git

cd pandoc

nano cabal.project

diff --git a/cabal.project b/cabal.project
index d5afefaa6..cd1e26e95 100644
--- a/cabal.project
+++ b/cabal.project
@@ -1,3 +1,8 @@
+source-repository-package
+    type: git
+    location: https://github.com/haskell-servant/servant.git
+    subdir: servant-server
+            servant
 packages: .
           pandoc-lua-engine
           pandoc-server

nano linux/make_artifacts.sh

diff --git a/linux/make_artifacts.sh b/linux/make_artifacts.sh
index 6d3c48954..6b025d9dc 100644
--- a/linux/make_artifacts.sh
+++ b/linux/make_artifacts.sh
@@ -1,6 +1,7 @@
 #!/bin/bash
 set -e
 
+cabal update
 cabal build $CABALOPTS --ghc-options="$GHCOPTS" pandoc-cli
 BINPATH=$(cabal list-bin $CABALOPTS --ghc-options="$GHCOPTS" pandoc-cli)
 echo "Built executable: $BINPATH"

nano pandoc-server/pandoc-server.cabal

diff --git a/pandoc-server/pandoc-server.cabal b/pandoc-server/pandoc-server.cabal
index 66ecf0624..6472825ba 100644
--- a/pandoc-server/pandoc-server.cabal
+++ b/pandoc-server/pandoc-server.cabal
@@ -59,7 +59,7 @@ library
                  data-default          >= 0.4      && < 0.8,
                  text                  >= 1.1.1.0  && < 2.1,
                  unicode-collation     >= 0.1.1    && < 0.2,
-                 servant-server        >= 0.19     && < 0.20,
+                 servant-server,
                  skylighting           >= 0.13     && < 0.14,
                  wai                   >= 3.2      && < 3.3,
                  wai-cors              >= 0.2.7    && < 0.3

export DOCKERIMAGE=glcr.b-data.ch/ghc/ghc-musl:9.6.1
export GHCOPTS="-j4 +RTS -A256m -RTS -split-sections -optc-Os -optl=-pthread"
export CABALOPTS="--allow-newer -f-export-dynamic -fembed_data_files -fserver -flua --enable-executable-static -j4"
export REVISION=1

docker run --rm -v $PWD:/mnt -v $PWD/linux/artifacts:/artifacts -e REVISION -e CABALOPTS -e GHCOPTS -w /mnt --userns host --memory=0 $DOCKERIMAGE bash /mnt/linux/make_artifacts.sh 2>&1 > docker.log

Build log: docker.log

[jgm]

Great! Let's wait for it to work with released packages before merging.

[benz0li]

Some more output from the docker run command that might be of interest:

src/Text/Pandoc/Writers/EPUB.hs:254:5: warning: [GHC-53633] [-Woverlapping-patterns]
    Pattern match is redundant
    In an equation for ‘addMetadataFromXML’:
        addMetadataFromXML e@(Element (QName name _ (Just "dc")) attrs _ _)
                           md | name == "type" = ...
    |
254 |   | name == "type" = md { epubType = Just $ strContent e }
    |     ^^^^^^^^^^^^^^

Cross references:

• https://errors.haskell.org
• https://errors.haskell.org/messages/GHC-53633/

[jgm]

The compiler has probably gotten smarter about detecting redundancies...
But if we remove this we may get a warning about incomplete pattern match from earlier compilers...would have to check.

[jgm]

You probably want to change l. 55 of .cirrus.yml as well.

[benz0li]

Waiting for Resolved: haskell-servant/servant#1680

[benz0li]

Waiting for Resolved: haskell-servant/servant#1679

[benz0li]

@jgm Pandoc builds with GHC v9.6.2, too.

ℹ️ Tested for both linux/amd64 and linux/arm64/v8.

[jgm]

excellent!