[Ubuntu] Rework haskell.sh to install Cabal using GHCup (#2636)

* reworked haskell installation

* added comment

* resolved comments and added symlink

* fixed haskell.sh

* update haskell.sh

* update installation

* added error suppressing

* reverted ghc intallation

* added comments

Co-authored-by: Nikita Bykov <v-nibyko@microsoft.com>

images/linux/scripts/SoftwareReport/SoftwareReport.Common.psm1

@@ -219,6 +219,12 @@ function Get-GHCVersion {
     return "GHC $ghcVersion"
 }
 
+function Get-GHCupVersion {
+    $(ghcup --version) -match "version v(?<version>\d+(\.\d+){2,})" | Out-Null
+    $ghcVersion = $Matches.version
+    return "GHCup $ghcVersion"
+}
+
 function Get-CabalVersion {
     $(cabal --version | Out-String) -match "cabal-install version (?<version>\d+\.\d+\.\d+\.\d+)" | Out-Null
     $cabalVersion = $Matches.version

images/linux/scripts/SoftwareReport/SoftwareReport.Generator.ps1

@@ -181,6 +181,7 @@ $markdown += New-MDNewLine
 $markdown += New-MDHeader "Haskell" -Level 3
 $markdown += New-MDList -Style Unordered -Lines (@(
     (Get-GHCVersion),
+    (Get-GHCupVersion),
     (Get-CabalVersion),
     (Get-StackVersion)
     ) | Sort-Object

images/linux/scripts/installers/haskell.sh

@@ -7,16 +7,30 @@
 # Source the helpers for use with the script
 source $HELPER_SCRIPTS/etc-environment.sh
 
+# Any nonzero value for noninteractive installation
+export BOOTSTRAP_HASKELL_NONINTERACTIVE=1
+export GHCUP_INSTALL_BASE_PREFIX=/usr/local
+export BOOTSTRAP_HASKELL_GHC_VERSION=0
+ghcup_bin=$GHCUP_INSTALL_BASE_PREFIX/.ghcup/bin
+setEtcEnvironmentVariable "BOOTSTRAP_HASKELL_NONINTERACTIVE" $BOOTSTRAP_HASKELL_NONINTERACTIVE
+
 # Install Herbert V. Riedel's PPA for managing multiple version of ghc on ubuntu.
 # https://launchpad.net/~hvr/+archive/ubuntu/ghc
 apt-get install -y software-properties-common
 add-apt-repository -y ppa:hvr/ghc
 apt-get update
 
+# Install GHCup
+curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh > /dev/null 2>&1 || true
+export PATH="$ghcup_bin:$PATH"
+prependEtcEnvironmentPath $ghcup_bin
+
 # Get 2 latest Haskell Major.Minor versions
 allGhcVersions=$(apt-cache search "^ghc-" | grep -Po '(\d*\.){2}\d*' | sort --unique --version-sort)
 ghcMajorMinorVersions=$(echo "$allGhcVersions" | cut -d "." -f 1,2 | sort --unique --version-sort | tail -2)
 
+# We are using apt-get to install ghc, not ghcup,
+# because ghc installed through ghcup takes up too much disk space (2GB versus 1GB through apt-get)
 for version in $ghcMajorMinorVersions; do
     # Get latest patch version for given Major.Minor one (ex. 8.6.5 for 8.6) and install it
     exactVersion=$(echo "$allGhcVersions" | grep $version | sort --unique --version-sort | tail -1)
@@ -25,16 +39,14 @@ for version in $ghcMajorMinorVersions; do
     defaultGHCVersion=$exactVersion
 done
 
-# Get latest cabal version
+echo "install cabal..."
-cabalVersion=$(apt-cache search cabal-install-[0-9] | grep -Po '\d*\.\d*' | sort --unique --version-sort | tail -1)
+ghcup install cabal
 
-apt-get install -y cabal-install-$cabalVersion
+chmod -R 777 $GHCUP_INSTALL_BASE_PREFIX/.ghcup
+ln -s $GHCUP_INSTALL_BASE_PREFIX/.ghcup /etc/skel/.ghcup
+ln -s "/opt/ghc/$defaultGHCVersion/bin/ghc" "/usr/bin/ghc"
 
 # Install the latest stable release of haskell stack
 curl -sSL https://get.haskellstack.org/ | sh
 
-# Create symlink for ghc and cabal in /usr/bin
-ln -s "/opt/ghc/$defaultGHCVersion/bin/ghc" "/usr/bin/ghc"
-ln -s "/opt/cabal/$cabalVersion/bin/cabal" "/usr/bin/cabal"
-
 invoke_tests "Haskell"

images/linux/scripts/tests/Haskell.Tests.ps1

@@ -17,6 +17,10 @@ Describe "Haskell" {
             "$GHCPath --version" | Should -ReturnZeroExitCode
     }
 
+    It "GHCup" {
+        "ghcup --version" | Should -ReturnZeroExitCode
+    }
+
     It "Default GHC" {
         "ghc --version" | Should -ReturnZeroExitCode
     }