106 lines
3.5 KiB
Bash
Executable File
106 lines
3.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Exit immediately if the script encounters a non-zero status.
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set -e
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# If set, Bash includes filenames beginning with a `.` in the results of
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# filename expansion. The filenames `.` and `..` must always be matched
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# explicitly, even if dotglob is set.
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shopt -s dotglob
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# ============================================================
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# PROLOGUE
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# ============================================================
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# Create a new top-level directory as fallback in case $BUILD (defined below)
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# is ever empty.
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mkdir -p "/tmp/bs.phoenix"
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# Create an intermediate build directory. The final step of this script will
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# copy the content from this directory to $OUT.
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BUILD=$(mktemp -d -p "/tmp/bs.phoenix")
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if [ -z "$BUILD" ]; then
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>&2 echo "Failed to create temp directory."
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exit 1
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fi
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# Deletes the intermediate build directory on exit. We use a concatenation of
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# the intermediate directory with the basename of the generated temp directory
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# to ensure we never evaluate to root (i.e. `/`). That should never actually
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# happen but a good habit to establish nonetheless.
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function cleanup {
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rm -r "/tmp/bs.phoenix/$(basename "$BUILD")"
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}
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trap cleanup EXIT
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# ============================================================
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# ENVIRONMENT
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# ============================================================
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# Trims away any whitespace around the module name.
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MODULE=$(echo "$MODULE" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')
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if [ -z "$MODULE" ]; then
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MODULE_ARG=
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else
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MODULE_ARG="--module '$MODULE'"
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fi
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# ============================================================
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# BUILD
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# ============================================================
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# Copy template contents over to the intermediate build directory.
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cp -r template/* "$BUILD"
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# Explicitly set permissions on all copied files.
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find "$BUILD" -type f -execdir chmod 644 {} +
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find "$BUILD" -type d -execdir chmod 755 {} +
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# Generate a new project with the specified name using `mix`. Generate in a
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# subdirectory to avoid interactive conflict resolution.
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nix develop "$BUILD" \
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--command bash \
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-c "mix phx.new $BUILD/project --app '$APP' $MODULE_ARG"
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# Copy the generated files into the intermediate build directory.
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mv -f "$BUILD"/project/* "$BUILD"
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rmdir "$BUILD"/project
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# Overwrite the generated README in favor of that defined in our template.
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cp template/README.md "$BUILD"
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chmod 644 "$BUILD"/README.md
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# Replace the template name found in the flake.nix file. The mix generator would
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# fail if $APP did not consist of just lowercase ASCII letters, numbers, or
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# underscores. Thus $APP is safe to interpolate into the following command.
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sed -i "s/<APP_NAME>/$APP/g" "$BUILD/flake.nix"
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# By default Phoenix generates a postgres configuration with assumed username
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# `postgres`. This flake encourages a local postgres database with username
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# `$(whoami)`. Reflect this in the config.
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sed -i "s/username: \"postgres\"/username: \"$(whoami)\"/g" "$BUILD/config/dev.exs"
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# Create a new database cluster.
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nix develop "$BUILD" --command bash -c "pg_ctl initdb -D $BUILD/data"
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# Append an additional rule to `.gitignore` to ignore the database cluster.
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cat <<EOF >> "$BUILD"/.gitignore
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# The default location of the generated database cluster.
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/data/
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# Directory used by \`direnv\` to hold \`use flake\`-generated profiles.
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/.direnv/
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# A symlink produced by default when running \`nix build\`.
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/result
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EOF
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# ============================================================
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# EPILOGUE
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# ============================================================
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# Success! Copy contents to target directory.
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cp -r "$BUILD"/* "$OUT"
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