Resize automatically images when was uploaded to server

README.md

Resize automatically images when was uploaded to server

For watch for changes in a folder, I use incron, what is a equivalent to cronjob
See man incrontab

Prerequisites

You must first install incron and GraphicsMagick
sudo apt-get install incron graphicsmagick
Add your username in /etc/incron.allow before to use incrontab, then execute incrontab -e and add the next lines (<path to watch> <file event> <script>)

/var/www/uploads/covers IN_CLOSE_WRITE,IN_DELETE /usr/local/bin/inotify.sh $@ $# $% /var/www/uploads/profiles IN_CLOSE_WRITE,IN_DELETE /usr/local/bin/inotify.sh $@ $# $%

inotify.sh

#!/bin/bash
usage() {
  tput bel
  tput setaf 2
  echo -e "Configure:" >&2
  tput setaf 4
  which incrontab >/dev/null 2>&1 || echo "`if [[ $USER != "root" ]]; then echo 'sudo'; fi` apt-get install incron"
  grep $USER /etc/incron.allow >/dev/null 2>&1 || echo "echo -e \$USER | `if [[ $USER != "root" ]]; then echo 'sudo'; fi` tee -a /etc/incron.allow"
  tput setaf 2
  echo "# Add this lines" >&2
  tput setaf 7
  echo "/var/www/uploads/covers IN_CLOSE_WRITE,IN_DELETE `pwd`/`basename $0` -d \$@ -f \$# -e \$%" >&2
  echo "/var/www/uploads/profiles IN_CLOSE_WRITE,IN_DELETE `pwd`/`basename $0` -d \$@ -f \$# -e \$%" >&2
  tput setaf 4
  echo "incrontab -e" >&2
  tput sgr0
}

if [[ $# -eq 0 ]]; then
  usage
  exit 1
fi

while getopts d:f:e:h OPT; do # "{d,f,e}:" waits for an argument "h" doesn't
  case $OPT in
    d )
      UPLOAD=`basename $OPTARG`
      FULLPATH=$OPTARG
    ;;
    f )
      FILENAME=`basename $OPTARG`
    ;;
    e )
      EVT=$OPTARG
    ;;
    h )
      usage
      exit 0
    ;;
    \?) # getopts issues an error message
      usage
      exit 1
    ;;
  esac
done

FULLPATH=$FULLPATH/$FILENAME
BASENAME=${0##*/}
BASENAME=${BASENAME%%.*}
MAX_NPROC=4
WORKDIR=/var/www/thumbnails
THUMBNAILS_DIR="$WORKDIR/$UPLOAD/small"
LOCK_DIR=$WORKDIR/$BASENAME.d

mkdir -p $THUMBNAILS_DIR $LOCK_DIR

message() {
  logger --id --tag $BASENAME $1
}

thumbnail() {
  gm convert $1 -resize $2^ -gravity center -extent $2 +profile "*" $3
  message "[$EVT] resize $1 to $2 => $3"
}

while [[ $EVT = "IN_CLOSE_WRITE" && $(ls $LOCK_DIR | wc -l) -ge $MAX_NPROC ]]; do
  wait
done

touch $LOCK_DIR/$$
trap 'rm -f "$LOCK_DIR/$$"; exit $?' INT TERM EXIT KILL

if [[ -f $FULLPATH && $EVT = "IN_CLOSE_WRITE" ]]; then
  case $UPLOAD in
    covers )
      thumbnail $FULLPATH "995x501" /tmp/$FILENAME
      thumbnail /tmp/$FILENAME "274x144" $THUMBNAILS_DIR/$FILENAME
      mv /tmp/$FILENAME $FULLPATH
    ;;
    profiles )
      thumbnail $FULLPATH "128x128" $THUMBNAILS_DIR/$FILENAME
      mv /tmp/$FILENAME $FULLPATH
    ;;
  esac
elif [ $EVT = "IN_DELETE" ]; then
  rm -f $THUMBNAILS_DIR/$FILENAME
  message "[$EVT] delete $THUMBNAILS_DIR/$FILENAME"
fi

rm -f $LOCK_DIR/$$
trap - INT TERM EXIT KILL