Updates base builder scripts

0_base/builder.sh

@@ -1,56 +1,127 @@
 #!/usr/bin/env sh
 set -eu
 
+################################################################################
+# Pre-flight checks.
+################################################################################
+
+command -v git >/dev/null 2>&1 || { echo >&2 "git is not installed, aborting."; exit 1; }
+command -v buildah >/dev/null 2>&1 || { echo >&2 "buildah is not installed, aborting."; exit 1; }
+
 # Start the script in the top-level repository directory no matter what.
 cd "$( git rev-parse --show-toplevel )"
 
-# XXX: Would it make sense to pull from an existing image if one exists?
-image="alpine-ghc-base"
-container="alpine-ghc-base-builder"
+################################################################################
+# Argument parsing.
+#
+# cf. https://sookocheff.com/post/bash/parsing-bash-script-arguments-with-shopts/
+################################################################################
+
+container="base"
+image="base"
+# NOTE: The logic associated with this will have to change for GHC 9.x and up to
+# support the changes introduced with the switch to `ghc-bignum`.
+numeric="gmp"
+
+usage="USAGE: $0
+    -h           show this help text
+    -c CONTAINER override the default container name
+                 default: ${container}
+    -i IMAGE     override the default image name
+                 default: ${image}
+    -n NUMERIC   override the numeric library GHC is built against; either 'gmp' or 'simple'
+                 default: ${numeric}"
+
+while getopts "c:i:n:h" opt; do
+  case ${opt} in
+    c ) {
+          container="${OPTARG}"
+    };;
+    i ) {
+          image="${OPTARG}"
+    };;
+    n ) {
+        if [ "${OPTARG}" = "gmp" ] || [ "${OPTARG}" = "simple" ]; then
+          numeric="${OPTARG}"
+        else
+            echo "Invalid NUMERIC argument (i.e. '-n')." >&2
+            echo "Expected either 'gmp' or 'simple', got '${OPTARG}'" >&2
+            exit 1
+        fi;
+    };;
+    h ) {
+          echo "${usage}"
+          exit 0
+    };;
+    \? ) {
+          echo "${usage}"
+          exit 1
+    };;
+  esac
+done
+shift $((OPTIND -1))
+
+if [ "$#" -ne 0 ]; then
+  exit 1
+fi
+
+# Add the numeric library to container and image names.
+container="${container}-${numeric}"
+image="${image}-${numeric}"
 
 ################################################################################
-# Attempt to create a new image using the container name defined above.
+# Container and basic dependencies.
+################################################################################
+
+# Create the "base" container that will be used elsewhere in the project.
 #
-# If the container already exists, assume that it's been created by a previous
-# run of this script and just use that.
+# NOTE: Alternatively: `buildah commit --rm` (at the end of the script) removes
+# the working container.
+#
+# XXX: Reusing the container by name if it exists seems like not the best idea
+# but it's convenient for development.
 buildah \
     --signature-policy=./policy.json \
     --name "${container}" \
     from --pull docker.io/library/alpine:3.14 \
     || true
 
-# Upgrade the currently installed packages.
+# Update index files and upgrade the currently installed packages.
 #
 # NOTE: This breaks reproducibility.
 buildah run "${container}" \
-    apk upgrade --no-cache
+    apk -U upgrade
 
 # Install basic dependencies required by 'ghcup', 'stack', and 'cabal-install'.
 buildah run "${container}" \
-    apk add --no-cache \
+    apk add \
       curl \
       gcc \
       git \
       libc-dev \
       xz
 
-# TODO: Guard this behind some argument that can toggle GMP-based builds.
-echo "Installing 'libgmp'."
-buildah run "${container}" \
-    apk add --no-cache gmp-dev
+if [ "${numeric}" = "gmp" ]; then
+  echo "Installing 'libgmp'."
+  buildah run "${container}" \
+      apk add gmp-dev
+fi;
 
 ################################################################################
-ghcup_version="0.1.9"
-ghcup_expected_checksum="d779ada6156b08da21e40c5bf218ec21d1308d5a9e48f7b9533f56b5d063a41c"
+# Download and install `ghcup`.
+################################################################################
+
+ghcup_version="0.1.16.2"
+ghcup_expected_checksum="d5e43b95ce1d42263376e414f7eb7c5dd440271c7c6cd9bad446fdeff3823893"
 
 # Fetch `ghcup`.
 buildah run "${container}" \
     wget \
         -O "/tmp/ghcup-${ghcup_version}" \
-        "https://downloads.haskell.org/~ghcup/0.1.9/x86_64-linux-ghcup-${ghcup_version}"
+        "https://downloads.haskell.org/~ghcup/${ghcup_version}/x86_64-linux-ghcup-${ghcup_version}"
 
 # Copy the checksum validation script into the container...
-buildah copy --chmod 111 ${container} \
+buildah copy --chmod 111 "${container}" \
     ./0_base/validate_checksum.sh \
     /tmp/validate_checksum.sh
 
@@ -68,12 +139,12 @@ buildah run "${container}" \
 buildah run "${container}" \
     chmod +x /usr/bin/ghcup
 
-# ...and clean up after ourselves.
+# ...clean up any scripts.
 buildah run "${container}" \
     rm -rf /tmp/validate_checksum.sh
 
 ################################################################################
-# Write the final `alpine-ghc-base` image from this container.
+# Write the final image from this container.
 buildah \
     --signature-policy=./policy.json \
     commit "${container}" "${image}"

0_base/validate_checksum.sh

@@ -7,4 +7,5 @@ ghcup_expected_checksum="$2"
 if ! echo "${ghcup_expected_checksum}  ${ghcup_path}" | sha256sum -c -; then
     echo "${ghcup_path} checksum failed" >&2
     echo "expected '${ghcup_expected_checksum}', but got '$( sha256sum "${ghcup_path}" )'" >&2
+    exit 1
 fi;