stevenuray

Keybase proof

I hereby claim:

• I am stevenuray on github.
• I am surayest (https://keybase.io/surayest) on keybase.
• I have a public key ASDk-AprMUppT3s8KSjWTXW3hlkN3aOK2pRcMxx9AXXpBwo

To claim this, I am signing this object:

stevenuray

#!/usr/bin/env bash
#This is called so that container startup is interrupted if npm install fails with a nonzero status code.
set -euo pipefail

stevenuray

#Script variables here
readonly NPM_DIR=/app/src/node_modules
readonly LOCK_FILE=$NPM_DIR/.npm_lock
readonly LOCK_FD=200
readonly MD5_FILE=$NPM_DIR/.package_md5

stevenuray

lock() {
  # Create lock file.
  eval "exec $2>$1"

  # Get exclusive, waiting lock on the file descriptor of the lock file.
  flock --exclusive $2
}

stevenuray

unlock() {
  flock --unlock $1
}

stevenuray

check_npm_libraries() {
  if [ ! -f $MD5_FILE ] || ! md5sum -c --status <<<"$(cat $MD5_FILE)"; then
    echo "INVALID"
  else
    echo "VALID"
  fi
}

stevenuray

install_npm_libraries() {
  npm install grunt
  echo "Installing npm Libraries..."
  npm install --loglevel info
  write_md5_sum_to_md5_file
}

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prepare_npm_volume() {
  #Try to get node_modules lock.
  lock $LOCK_FILE $LOCK_FD

  #Check status of npm libraries now that this container has the lock.
  echo "This container has the lock on the npm libraries."
  npm_library_status=$(check_npm_libraries)

  if [ "$npm_library_status" == "INVALID" ]; then
    install_npm_libraries

stevenuray

#!/usr/bin/env bash
# Application containers should not continue starting 
# if their dependencies are unverified, 
# so if any command in this script fails the container 
# will stop it’s initialization process and 
# an error message will be presented to the user. 
set -euo pipefail

# Set variables here
# The resource to have synchronized write access is the node_modules directory.