bootstrap/specs/phoenix/runner

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#!/usr/bin/env bash
# Exit immediately if the script encounters a non-zero status.
set -e
# If set, Bash includes filenames beginning with a `.` in the results of
# filename expansion. The filenames `.` and `..` must always be matched
# explicitly, even if dotglob is set.
shopt -s dotglob
# ============================================================
# PROLOGUE
# ============================================================
# Create a new top-level directory as fallback in case $BUILD (defined below)
# is ever empty.
mkdir -p "/tmp/bs.phoenix"
# Create an intermediate build directory. The final step of this script will
# copy the content from this directory to $OUT.
BUILD=$(mktemp -d -p "/tmp/bs.phoenix")
if [ -z "$BUILD" ]; then
>&2 echo "Failed to create temp directory."
exit 1
fi
# Deletes the intermediate build directory on exit. We use a concatenation of
# the intermediate directory with the basename of the generated temp directory
# to ensure we never evaluate to root (i.e. `/`). That should never actually
# happen but a good habit to establish nonetheless.
function cleanup {
rm -r "/tmp/bs.phoenix/$(basename "$BUILD")"
}
trap cleanup EXIT
# ============================================================
# ENVIRONMENT
# ============================================================
if [ -z "$MODULE" ]; then
MODULE_ARG=
else
MODULE_ARG="--module '$MODULE'"
fi
# ============================================================
# BUILD
# ============================================================
# Copy template contents over to the intermediate build directory.
cp -r template/* "$BUILD"
# Explicitly set permissions on all copied template files.
find "$BUILD" -type f -execdir chmod 644 {} +
find "$BUILD" -type d -execdir chmod 755 {} +
chmod 755 "$BUILD"/.githooks/pre-commit
# Generate a new project with the specified name using `mix`. Generate in a
# subdirectory to avoid interactive conflict resolution.
nix develop "$BUILD" \
--command bash \
-c "mix phx.new $BUILD/bs.project --app '$APP' $MODULE_ARG"
# Copy the generated files into the intermediate build directory.
mv -f "$BUILD"/bs.project/* "$BUILD"
rmdir "$BUILD"/bs.project
# Overwrite the generated README in favor of that defined in our template.
cp template/README.md "$BUILD"
chmod 644 "$BUILD"/README.md
# Include additional build files for our assets. Group into subdirectory so
# the `chmod` command can take advantage of globbing.
mkdir -p "$BUILD"/bs.assets
cp assets/* "$BUILD"/bs.assets
chmod 644 "$BUILD"/bs.assets/*
mv "$BUILD"/bs.assets/* "$BUILD"/assets
rmdir "$BUILD"/bs.assets
# Create a new database cluster.
nix develop "$BUILD" --command bash -c "pg_ctl initdb -D $BUILD/db"
# ============================================================
# REWRITES
# ============================================================
# The mix generator would fail if $APP did not consist of just lowercase ASCII
# letters, numbers, or underscores. Thus $APP is safe to interpolate into the
# following command.
for file in flake.nix assets/{package.json,package-lock.json,node-packages.nix}
do
sed -i "s/<APP>/$APP/g" "$BUILD/$file"
done
# Allow specifying a custom path to our :esbuild and :tailwind configs.
# Typically when building a Phoenix application, Mix will download
# esbuild/tailwind binaries on demand. Within nix environments this is not
# possible. Instead, specify them directly with these environment variables.
sed -i \
'42 s/$/,/;
43 i \ \ path: System.get_env("MIX_ESBUILD_PATH")
s/version: \"0.17.11\"/version: \"0.19.7\"/
54 s/$/,/;
55 i \ \ path: System.get_env("MIX_TAILWIND_PATH")
s/version: \"3.3.2\"/version: \"3.3.5\"/' \
"$BUILD/config/config.exs"
# By default Phoenix generates a postgres configuration with assumed username
# `postgres`. This flake encourages a local postgres database with username
# `$(whoami)`. Reflect this in the config.
sed -i "s/username: \"postgres\"/username: \"$(whoami)\"/g" "$BUILD/config/dev.exs"
# Append an additional rule to `.gitignore` to ignore the database cluster.
cat <<EOF >> "$BUILD"/.gitignore
# The default location of the generated database cluster.
/db/
# Directory used by \`direnv\` to hold \`use flake\`-generated profiles.
/.direnv/
# A symlink produced by default when running \`nix build\`.
/result
EOF
# ============================================================
# EPILOGUE
# ============================================================
# Success! Copy contents to target directory.
cp -a "$BUILD"/* "$OUT"