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| Original file line number | Diff line number | Diff line change |
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| #!/bin/bash | ||
| # | ||
| # Copyright 2022-2023 the Bashy-lib Authors (Dan Bornstein et alia). | ||
| # SPDX-License-Identifier: Apache-2.0 | ||
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| # Figure out the symlink-resolved program name and directory. | ||
| cmdName="$(readlink -f "$0")" || exit "$?" | ||
| cmdDir="${cmdName%/*}" | ||
| cmdName="${cmdName##*/}" | ||
| baseDir="${cmdDir%/*}" | ||
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| # | ||
| # Argument processing | ||
| # | ||
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| # This _just_ extracts `--print-node-command` and `--node-opts ... --`, leaving | ||
| # everything else intact, because the bulk of the options are processed by the | ||
| # main program. | ||
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| # Options to pass to `node`. | ||
| nodeOpts=() | ||
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| # Arguments to pass to the main program. | ||
| mainArgs=() | ||
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| # Print the `node ...` command to stderr before actually running it? | ||
| printNodeCommand=0 | ||
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| # Collect node options? | ||
| wantNodeOpts=0 | ||
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| while (( $# != 0 )); do | ||
| if (( wantNodeOpts )); then | ||
| if [[ $1 == '--' ]]; then | ||
| wantNodeOpts=0 | ||
| else | ||
| nodeOpts+=("$1") | ||
| fi | ||
| shift | ||
| continue | ||
| fi | ||
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| case "$1" in | ||
| --node-opts) | ||
| wantNodeOpts=1 | ||
| ;; | ||
| --print-node-command) | ||
| printNodeCommand=1 | ||
| ;; | ||
| --*|-?*) | ||
| # Option to pass through. | ||
| mainArgs+=("$1") | ||
| ;; | ||
| *) | ||
| # Non-option argument (including `--` to explicitly end options). | ||
| break | ||
| ;; | ||
| esac | ||
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| shift | ||
| done | ||
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| # Append the rest of the arguments to `mainArgs`. | ||
| mainArgs+=("$@") | ||
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| # | ||
| # Helper functions | ||
| # | ||
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| # Prints an error message to `stderr`. | ||
| function error-msg { | ||
| echo 1>&2 "$@" | ||
| } | ||
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| # Checks one dependency. | ||
| function check-dependency { | ||
| local name="$1" | ||
| local versionCmd="$2" | ||
| local match="$3" | ||
| local versionMsg="$4" | ||
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| # Extract just the binary (executable / command / tool) name. | ||
| local cmdName='' | ||
| if [[ ${versionCmd} =~ ^([^ ]+) ]]; then | ||
| cmdName="${BASH_REMATCH[1]}" | ||
| else | ||
| # Note: This indicates a bug in this script, not a problem with the | ||
| # environment. | ||
| error-msg "Could not determine binary name for ${name}." | ||
| return 1 | ||
| fi | ||
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| # Verify that the command exists at all. | ||
| if ! which "${cmdName}" >/dev/null 2>&1; then | ||
| error-msg "Missing required binary for ${name}: ${cmdName}" | ||
| return 1 | ||
| fi | ||
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| local version | ||
| version=$(eval "${versionCmd}") \ | ||
| || { | ||
| # Note: This indicates a bug in this script, not a problem with the | ||
| # environment. | ||
| error-msg "Trouble running version command for ${name}." | ||
| return 1 | ||
| } | ||
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| if [[ !(${version} =~ ${match}) ]]; then | ||
| error-msg "Unsupported version of ${name}: ${version}" | ||
| error-msg " required: ${versionMsg}" | ||
| return 1 | ||
| fi | ||
| } | ||
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| # | ||
| # Main script | ||
| # | ||
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| check-dependency \ | ||
| 'Node' \ | ||
| 'node --version | sed -e "s/^v//g"' \ | ||
| '^(18|19|20)\.' \ | ||
| '18..20' \ | ||
| || exit "$?" | ||
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| # Notes: | ||
| # * `--no-warnings` suppresses Node's built-in warning printer, which we do | ||
| # because the program is expected to include its own warning handler. | ||
| # * `--experimental-vm-modules` enables the `node:vm/Module` class and related | ||
| # functionality. | ||
| fullCommand=( | ||
| node "${nodeOpts[@]}" --no-warnings --experimental-vm-modules | ||
| "${baseDir}/lib/code/index.js" | ||
| --outer-command-name="${cmdName}" | ||
| "${mainArgs[@]}" | ||
| ) | ||
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| if (( printNodeCommand )); then | ||
| echo 1>&2 'Running system via command:' | ||
| printf 1>&2 ' %q\n' "${fullCommand[@]}" | ||
| fi | ||
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| # Note: `exec` minimizes the number of processes left lying around. That is, no | ||
| # need for this script to take up space once the system is running. In addition | ||
| # to just being tidy, it helps when this program is run via / within a service | ||
| # manager such as `systemd`. | ||
| exec "${fullCommand[@]}" |