Script to install one or more jenkins plugins including dependencies while jenkins is offline

install_jenkins_plugin.sh

#!/usr/bin/env bash

set -e
set -o pipefail

plugin_repo_url="http://updates.jenkins-ci.org/download/plugins"
plugin_dir="/var/lib/jenkins/plugins"
include_optionals=false

showUsage() {
	echo "\
$0 [OPTIONS] plugin@version ...

OPTIONS:
-d,--dir DIR    Install dir. Default is $plugin_dir
-a,--all        Install also optional dependencies
-u,--url URL    Change to plugin repo URL. Default is $plugin_repo_url
-h,--help       Print this help"
}

while [[ $# -gt 0 ]]
do
key="$1"

case $key in
    -u|--url)
    plugin_repo_url="$2"
    shift
    ;;
    -d|--dir)
    plugin_dir="$2"
    shift
    ;;
    -a|--all)
    include_optionals=true
    ;;
    -h|--help)
    showUsage
    exit
    ;;
    -*|--*)
    echo "Unknown Option"
    exit 1
    ;;
    *)
    break
    ;;
esac
shift
done

download_plugin() {
  url="${plugin_repo_url}/${1}/${2}/${1}.hpi"
  echo "Downloading: $1@$2"
  curl -L --silent --output "${plugin_dir}/${1}.hpi" "$url"
}

get_dependencies() {
  hpi_file=$1
  manifest="$(unzip -p "${hpi_file}" META-INF/MANIFEST.MF | tr -d '\r' | sed -e ':a' -e 'N' -e '$!ba' -e 's/\n //g' )"
  if line=$( echo "$manifest" | grep -e "^Plugin-Dependencies" ); then
    deps=$( echo "$line" | awk '{ print $2 }' | tr ',' '\n' )
    if ! $include_optionals; then
      deps=$( echo "$deps" | grep -v "resolution:=optional" )
    fi
    sed 's/;.*$//' <<< "$deps"
  else
    echo ""
  fi
}

vercomp () {
    if [[ "$1" == "$2" ]]
    then
        echo 0
        return
    fi
    local IFS=.
    local i ver1=($1) ver2=($2)
    # fill empty fields in ver1 with zeros
    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
    do
        ver1[i]=0
    done
    for ((i=0; i<${#ver1[@]}; i++))
    do
        if [[ -z ${ver2[i]} ]]
        then
            # fill empty fields in ver2 with zeros
            ver2[i]=0
        fi
        if ((10#${ver1[i]} > 10#${ver2[i]}))
        then
            echo 1
            return
        fi
        if ((10#${ver1[i]} < 10#${ver2[i]}))
        then
            echo -1
            return
        fi
    done
    echo 0
}

installed_plugins=()

install_plugin() {
  plugin_id="$1"
  plugin_version="$2"

  if grep -q "$plugin_id" <<< "$installed_plugins[*]"; then
  	return 0
  fi

  dest="${plugin_dir}/${1}.hpi"

  if [ -f "$dest" ]; then
  	installed_version=$(unzip -p "${dest}" META-INF/MANIFEST.MF | tr -d '\r' | grep "^Plugin-Version" | awk '{ print $2 }' | tr -d '\n' )

  	if [ "$(vercomp "$installed_version" "$plugin_version")" -lt "0" ]; then
  		echo "Updating $plugin_id from $installed_version to $plugin_version"
  		download_plugin "$plugin_id" "$plugin_version" "$plugin_dir"
  	fi
  else
    download_plugin "$plugin_id" "$plugin_version" "$plugin_dir"
  fi

  installed_plugins+=("$plugin_id")

  deps="$(get_dependencies "$dest")"
	echo "$deps" | tr ' ' '\n' |
	while IFS=: read -r plugin version; do
	  install_plugin "$plugin" "$version"
	done
}

for plugin in "$@"; do
  IFS="@" read -r plugin version <<< "$plugin"
  #escape comments
  if [[ "$plugin" =~ ^# ]]; then
     continue
  fi

  #install the plugin
  install_plugin "$plugin" "$version"
done

echo "Done"

Sorry for the silence. It seems that I didn't got notified of your comments.
@FlowsenAusMonotown No, latest is not supported. But it should be easy to add this feature. Maybe you want to try this script instead: https://github.com/jenkinsci/docker/blob/master/install-plugins.sh
@Eldadc This script, against it's name, does not really "install" the plugins. It just resolves dependencies and downloads. Downloading the hpi files to the jenkins plugin folder, however, should be sufficient.

@hoesler @FlowsenAusMonotown i've done a fork that handles @latest
also fixes a looping issue if you try a plugin like [email protected]

it uses the plugin version from the downloaded hpi
skips version upgrade check is version is latest
it stores plugin@version instead of just plugin so it short circuits when working out if i needs to download a dependency, also so it knows what it's already downloaded so doesn't look at it again

Man, great thank you for your work and saving my time, I faced task with installation of certain versions of plugins and it was painful, but your work saved me