Executable zip file

executable_zip_file_demo.sh

set -e

rm -rf out
mkdir out

cat >"index.js" <<EOF
console.log("hello from nodejs!");
EOF

zip -q out/archive.zip index.js

rm index.js

# escape all the $s so they're not eval'd till later
cat >"header.sh" <<EOF
#!/bin/bash
tmp=\$(mktemp --directory)
unzip -qo \$0 -d \$tmp
node "\$tmp/index.js"
exit
EOF

# This creates a zip file that looks like this;
# <header>
# <archive>
cat header.sh out/archive.zip > out/archive.zip.bak
mv out/archive.zip.bak out/archive.zip

# the "A" option adjusts the offset, telling zip where the actual
# archive starts
zip -qA out/archive.zip
chmod +x out/archive.zip

# $ bash executable_zip_file_demo.sh
# $ ./out/archive.zip
# hello from nodejs!