all.bash,devtools: add support for running npx commands

We will need to run npx commands with docker when
running tests in CI. This change creates an npx
command in all.bash and modifies the docker_nodejs
script to share networking with the host so it can
connect to a local instance of the frontend.

Change-Id: Id8f32a7ff5bf017cb55c531b1e37a3f8aab0e73a
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/322635
Trust: Jamal Carvalho <jamal@golang.org>
Reviewed-by: Julie Qiu <julie@golang.org>

all.bash

@@ -191,6 +191,18 @@ run_npm() {
   runcmd $npmcmd $@
 }
 
+run_npx() {
+  npxcmd="./devtools/docker_nodejs.sh npx"
+  if [[ -x "$(command -v npx)" ]]; then
+    npxcmd="npx"
+  fi
+  # Run npm install if node_modules directory does not exist.
+  if [ ! -d "node_modules" ]; then
+    run_npm install --quiet
+  fi
+  runcmd $npxcmd $@
+}
+
 prettier_file_globs='content/static/**/*.{ts,css} **/*.md'
 
 # run_prettier runs prettier on CSS, JS, and MD files. Uses globally
@@ -236,7 +248,8 @@ Available subcommands:
   headers        - (lint) check source files for the license disclaimer
   migrations     - (lint) check migration sequence numbers
   misspell       - (lint) run misspell on source files
-  npm            - run npm scripts from package.json
+  npm            - run npm commands or scripts from package.json
+  npx            - run a command from a local or remote npm package
   script_hashes  - (lint) check script hashes
   script_output  - (lint) check script output
   staticcheck    - (lint) run staticcheck on source files
@@ -328,6 +341,7 @@ main() {
     script_hashes) check_script_hashes ;;
     build_static) run_build_static ;;
     npm) run_npm ${@:2} ;;
+    npx) run_npx ${@:2} ;;
 
     *)
       usage

devtools/docker_nodejs.sh

@@ -8,4 +8,4 @@ set -e
 
 # Script for running a nodejs docker image.
 
-docker run --rm -v `pwd`:/pkgsite -w /pkgsite  node:15.14.0 $@
+docker run --net=host --rm -v `pwd`:/pkgsite -w /pkgsite  node:15.14.0 $@