/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 */

import org.elasticsearch.gradle.LoggedExec
import org.elasticsearch.gradle.MavenFilteringHack
import org.elasticsearch.gradle.OS
import org.elasticsearch.gradle.info.BuildParams
import org.redline_rpm.header.Flags

import java.nio.file.Files
import java.nio.file.Path
import java.util.regex.Matcher
import java.util.regex.Pattern

/*****************************************************************************
 *                         Deb and rpm configuration                         *
 *****************************************************************************
 *
 * The general strategy here is to build a directory on disk that contains
 * stuff that needs to be copied into the distributions. This is
 * important for two reasons:
 * 1. ospackage wants to copy the directory permissions that it sees off of the
 *    filesystem. If you ask it to create a directory that doesn't already
 *    exist on disk it petulantly creates it with 0755 permissions, no matter
 *    how hard you try to convince it otherwise.
 * 2. Convincing ospackage to pick up an empty directory as part of a set of
 *    directories on disk is reasonably easy. Convincing it to just create an
 *    empty directory requires more wits than I have.
 * 3. ospackage really wants to suck up some of the debian control scripts
 *    directly from the filesystem. It doesn't want to process them through
 *    MavenFilteringHack or any other copy-style action.
 *
 * The following commands are useful when it comes to check the user/group
 * and files permissions set within the RPM and DEB packages:
 *
 *    rpm -qlp --dump path/to/elasticsearch.rpm
 *    dpkg -c path/to/elasticsearch.deb
 */

plugins {
  id "nebula.ospackage-base" version "8.0.3"
}

void addProcessFilesTask(String type, boolean oss, boolean jdk) {
  String packagingFiles = "build/packaging/${oss ? 'oss-' : ''}${jdk ? '' : 'no-jdk-'}${type}"

  String taskName = "process${oss ? 'Oss' : ''}${jdk ? '' : 'NoJdk'}${type.capitalize()}Files"
  task(taskName, type: Copy) {
    into packagingFiles

    with copySpec {
      from 'src/common'
      from "src/${type}"
      MavenFilteringHack.filter(it, expansionsForDistribution(type, oss, jdk))
    }

    into('etc/elasticsearch') {
      with configFiles(type, oss, jdk)
    }
    MavenFilteringHack.filter(it, expansionsForDistribution(type, oss, jdk))

    doLast {
      // create empty dirs, we set the permissions when configuring the packages
      mkdir "${packagingFiles}/var/log/elasticsearch"
      mkdir "${packagingFiles}/var/lib/elasticsearch"
      mkdir "${packagingFiles}/usr/share/elasticsearch/plugins"

      // bare empty dir for /etc/elasticsearch and /etc/elasticsearch/jvm.options.d
      mkdir "${packagingFiles}/elasticsearch"
      mkdir "${packagingFiles}/elasticsearch/jvm.options.d"
    }
  }
}

addProcessFilesTask('deb', true, true)
addProcessFilesTask('deb', true, false)
addProcessFilesTask('deb', false, true)
addProcessFilesTask('deb', false, false)
addProcessFilesTask('rpm', true, true)
addProcessFilesTask('rpm', true, false)
addProcessFilesTask('rpm', false, true)
addProcessFilesTask('rpm', false, false)

// Common configuration that is package dependent. This can't go in ospackage
// since we have different templated files that need to be consumed, but the structure
// is the same
Closure commonPackageConfig(String type, boolean oss, boolean jdk) {
  return {
    onlyIf {
      OS.current().equals(OS.WINDOWS) == false
    }
    dependsOn "process${oss ? 'Oss' : ''}${jdk ? '' : 'NoJdk'}${type.capitalize()}Files"
    packageName "elasticsearch${oss ? '-oss' : ''}"
    arch(type == 'deb' ? 'amd64' : 'X86_64')
    // Follow elasticsearch's file naming convention
    String jdkString = jdk ? "" : "no-jdk-"
    String prefix = "${oss ? 'oss-' : ''}${jdk ? '' : 'no-jdk-'}${type}"
    destinationDir = file("${prefix}/build/distributions")

    // SystemPackagingTask overrides default archive task convention mappings, but doesn't provide a setter so we have to override the convention mapping itself
    conventionMapping.archiveFile = { objects.fileProperty().fileValue(file("${destinationDir}/${packageName}-${project.version}-${jdkString}${archString}.${type}")) }

    String packagingFiles = "build/packaging/${oss ? 'oss-' : ''}${jdk ? '' : 'no-jdk-'}${type}"

    String scripts = "${packagingFiles}/scripts"
    preInstall file("${scripts}/preinst")
    postInstall file("${scripts}/postinst")
    preUninstall file("${scripts}/prerm")
    postUninstall file("${scripts}/postrm")
    if (type == 'rpm') {
      postTrans file("${scripts}/posttrans")
    }

    // top level "into" directive is not inherited from ospackage for some reason, so we must
    // specify it again explicitly for copying common files
    into('/usr/share/elasticsearch') {
      into('bin') {
        with binFiles(type, oss, jdk)
      }
      from(rootProject.projectDir) {
        include 'README.asciidoc'
        fileMode 0644
      }
      into('lib') {
        with libFiles(oss)
      }
      into('modules') {
        with modulesFiles(oss, 'linux')
      }
      if (jdk) {
        into('jdk') {
          with jdkFiles(project, 'linux')
        }
      }
      // we need to specify every intermediate directory in these paths so the package managers know they are explicitly
      // intended to manage them; otherwise they may be left behind on uninstallation. duplicate calls of the same
      // directory are fine
      eachFile { FileCopyDetails fcp ->
        String[] segments = fcp.relativePath.segments
        for (int i = segments.length - 2; i > 2; --i) {
          if (type == 'rpm') {
            directory('/' + segments[0..i].join('/'), 0755)
          }
          if (segments[-2] == 'bin' || segments[-1] == 'jspawnhelper') {
            fcp.mode = 0755
          } else {
            fcp.mode = 0644
          }
        }
      }
    }

    // license files
    if (type == 'deb') {
      into("/usr/share/doc/${packageName}") {
        from "${packagingFiles}/copyright"
        fileMode 0644
      }
    } else {
      assert type == 'rpm'
      into('/usr/share/elasticsearch') {
        from(rootProject.file('licenses')) {
          include oss ? 'APACHE-LICENSE-2.0.txt' : 'ELASTIC-LICENSE.txt'
          rename { 'LICENSE.txt' }
        }
        fileMode 0644
      }
    }

    // ========= config files =========
    configurationFile '/etc/elasticsearch/elasticsearch.yml'
    configurationFile '/etc/elasticsearch/jvm.options'
    configurationFile '/etc/elasticsearch/log4j2.properties'
    if (oss == false) {
      configurationFile '/etc/elasticsearch/role_mapping.yml'
      configurationFile '/etc/elasticsearch/roles.yml'
      configurationFile '/etc/elasticsearch/users'
      configurationFile '/etc/elasticsearch/users_roles'
    }
    from("${packagingFiles}") {
      dirMode 02750
      into('/etc')
      permissionGroup 'elasticsearch'
      includeEmptyDirs true
      createDirectoryEntry true
      include("elasticsearch") // empty dir, just to add directory entry
      include("elasticsearch/jvm.options.d") // empty dir, just to add directory entry
    }
    from("${packagingFiles}/etc/elasticsearch") {
      into('/etc/elasticsearch')
      dirMode 02750
      fileMode 0660
      permissionGroup 'elasticsearch'
      includeEmptyDirs true
      createDirectoryEntry true
      fileType CONFIG | NOREPLACE
    }
    String envFile = expansionsForDistribution(type, oss, jdk)['path.env']
    configurationFile envFile
    into(new File(envFile).getParent()) {
      fileType CONFIG | NOREPLACE
      permissionGroup 'elasticsearch'
      fileMode 0660
      from "${packagingFiles}/env/elasticsearch"
    }

    // ========= systemd =========
    into('/usr/lib/tmpfiles.d') {
      from "${packagingFiles}/systemd/elasticsearch.conf"
      fileMode 0644
    }
    into('/usr/lib/systemd/system') {
      fileType CONFIG | NOREPLACE
      from "${packagingFiles}/systemd/elasticsearch.service"
      fileMode 0644
    }
    into('/usr/lib/sysctl.d') {
      fileType CONFIG | NOREPLACE
      from "${packagingFiles}/systemd/sysctl/elasticsearch.conf"
      fileMode 0644
    }
    into('/usr/share/elasticsearch/bin') {
      from "${packagingFiles}/systemd/systemd-entrypoint"
      fileMode 0755
    }

    // ========= sysV init =========
    configurationFile '/etc/init.d/elasticsearch'
    into('/etc/init.d') {
      fileMode 0750
      fileType CONFIG | NOREPLACE
      from "${packagingFiles}/init.d/elasticsearch"
    }

    // ========= empty dirs =========
    // NOTE: these are created under packagingFiles as empty, but the permissions are set here
    Closure copyEmptyDir = { path, u, g, mode ->
      File file = new File(path)
      into(file.parent) {
        from "${packagingFiles}/${file.parent}"
        include file.name
        includeEmptyDirs true
        createDirectoryEntry true
        user u
        permissionGroup g
        dirMode mode
      }
    }
    copyEmptyDir('/var/log/elasticsearch', 'elasticsearch', 'elasticsearch', 02750)
    copyEmptyDir('/var/lib/elasticsearch', 'elasticsearch', 'elasticsearch', 02750)
    copyEmptyDir('/usr/share/elasticsearch/plugins', 'root', 'root', 0755)

    // the oss package conflicts with the default distribution and vice versa
    conflicts('elasticsearch' + (oss ? '' : '-oss'))

    into '/usr/share/elasticsearch'
    with noticeFile(oss, jdk)
  }
}

apply plugin: 'nebula.ospackage-base'

// this is package indepdendent configuration
ospackage {
  maintainer 'Elasticsearch Team <info@elastic.co>'
  summary 'Distributed RESTful search engine built for the cloud'
  packageDescription '''
    Reference documentation can be found at
    https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html
    and the 'Elasticsearch: The Definitive Guide' book can be found at
    https://www.elastic.co/guide/en/elasticsearch/guide/current/index.html
  '''.stripIndent().trim()
  url 'https://www.elastic.co/'

  // signing setup
  if (project.hasProperty('signing.password') && BuildParams.isSnapshotBuild() == false) {
    signingKeyId = project.hasProperty('signing.keyId') ? project.property('signing.keyId') : 'D88E42B4'
    signingKeyPassphrase = project.property('signing.password')
    signingKeyRingFile = project.hasProperty('signing.secretKeyRingFile') ?
      project.file(project.property('signing.secretKeyRingFile')) :
      new File(new File(System.getProperty('user.home'), '.gnupg'), 'secring.gpg')
  }

  // version found on oldest supported distro, centos-6
  requires('coreutils', '8.4', GREATER | EQUAL)

  fileMode 0644
  dirMode 0755
  user 'root'
  permissionGroup 'root'

  into '/usr/share/elasticsearch'
}

Closure commonDebConfig(boolean oss, boolean jdk) {
  return {
    configure(commonPackageConfig('deb', oss, jdk))

    // jdeb does not provide a way to set the License control attribute, and ospackage
    // silently ignores setting it. Instead, we set the license as "custom field"
    if (oss) {
      customFields['License'] = 'ASL-2.0'
    } else {
      customFields['License'] = 'Elastic-License'
    }

    version = project.version.replace('-', '~')
    packageGroup 'web'

    // versions found on oldest supported distro, centos-6
    requires('bash', '4.1', GREATER | EQUAL)
    requires('lsb-base', '4', GREATER | EQUAL)
    requires 'libc6'
    requires 'adduser'

    into('/usr/share/lintian/overrides') {
      from('src/deb/lintian/elasticsearch')
      if (oss) {
        rename('elasticsearch', 'elasticsearch-oss')
      }
    }
  }
}

task buildDeb(type: Deb) {
  configure(commonDebConfig(false, true))
}

task buildOssDeb(type: Deb) {
  configure(commonDebConfig(true, true))
}

task buildNoJdkDeb(type: Deb) {
  configure(commonDebConfig(false, false))
}

task buildOssNoJdkDeb(type: Deb) {
  configure(commonDebConfig(true, false))
}

Closure commonRpmConfig(boolean oss, boolean jdk) {
  return {
    configure(commonPackageConfig('rpm', oss, jdk))

    if (oss) {
      license 'ASL 2.0'
    } else {
      license 'Elastic License'
    }

    packageGroup 'Application/Internet'
    requires '/bin/bash'

    obsoletes packageName, '7.0.0', Flags.LESS

    prefix '/usr'
    packager 'Elasticsearch'
    version = project.version.replace('-', '_')
    release = '1'
    os 'LINUX'
    distribution 'Elasticsearch'
    vendor 'Elasticsearch'
    // TODO ospackage doesn't support icon but we used to have one

    // without this the rpm will have parent dirs of any files we copy in, eg /etc/elasticsearch
    addParentDirs false
  }
}

task buildRpm(type: Rpm) {
  configure(commonRpmConfig(false, true))
}

task buildOssRpm(type: Rpm) {
  configure(commonRpmConfig(true, true))
}

task buildNoJdkRpm(type: Rpm) {
  configure(commonRpmConfig(false, false))
}

task buildOssNoJdkRpm(type: Rpm) {
  configure(commonRpmConfig(true, false))
}

Closure dpkgExists = { it -> new File('/bin/dpkg-deb').exists() || new File('/usr/bin/dpkg-deb').exists() || new File('/usr/local/bin/dpkg-deb').exists() }
Closure rpmExists = { it -> new File('/bin/rpm').exists() || new File('/usr/bin/rpm').exists() || new File('/usr/local/bin/rpm').exists() }

Closure debFilter = { f -> f.name.endsWith('.deb') }

// This configures the default artifact for the distribution specific
// subprojects. We have subprojects because Gradle project substitutions
// can only bind to the default configuration of a project
subprojects {
  apply plugin: 'distribution'

  String buildTask = "build${it.name.replaceAll(/-[a-z]/) { it.substring(1).toUpperCase() }.capitalize()}"
  ext.buildDist = parent.tasks.getByName(buildTask)
  artifacts {
    'default' buildDist
  }

  if (dpkgExists() || rpmExists()) {

    // sanity checks if packages can be extracted
    final File extractionDir = new File(buildDir, 'extracted')
    File packageExtractionDir
    if (project.name.contains('deb')) {
      packageExtractionDir = new File(extractionDir, 'deb-extracted')
    } else {
      assert project.name.contains('rpm')
      packageExtractionDir = new File(extractionDir, 'rpm-extracted')
    }
    task checkExtraction(type: LoggedExec) {
      dependsOn buildDist
      doFirst {
        project.delete(extractionDir)
        extractionDir.mkdirs()
      }
    }

    check.dependsOn checkExtraction
    if (project.name.contains('deb')) {
      checkExtraction {
        onlyIf dpkgExists
        commandLine 'dpkg-deb', '-x', "${-> buildDist.outputs.files.filter(debFilter).singleFile}", packageExtractionDir
      }
    } else {
      assert project.name.contains('rpm')
      checkExtraction {
        onlyIf rpmExists
        final File rpmDatabase = new File(extractionDir, 'rpm-database')
        commandLine 'rpm',
          '--badreloc',
          '--nodeps',
          '--noscripts',
          '--notriggers',
          '--dbpath',
          rpmDatabase,
          '--relocate',
          "/=${packageExtractionDir}",
          '-i',
          "${-> buildDist.outputs.files.singleFile}"
      }
    }

    task checkLicense {
      dependsOn buildDist, checkExtraction
    }
    check.dependsOn checkLicense
    if (project.name.contains('deb')) {
      checkLicense {
        onlyIf dpkgExists
        doLast {
          Path copyrightPath
          String expectedLicense
          String licenseFilename
          if (project.name.contains('oss-')) {
            copyrightPath = packageExtractionDir.toPath().resolve("usr/share/doc/elasticsearch-oss/copyright")
            expectedLicense = "ASL-2.0"
            licenseFilename = "APACHE-LICENSE-2.0.txt"
          } else {
            copyrightPath = packageExtractionDir.toPath().resolve("usr/share/doc/elasticsearch/copyright")
            expectedLicense = "Elastic-License"
            licenseFilename = "ELASTIC-LICENSE.txt"
          }
          final List<String> header = Arrays.asList("Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/",
            "Copyright: Elasticsearch B.V. <info@elastic.co>",
            "License: " + expectedLicense)
          final List<String> licenseLines = Files.readAllLines(rootDir.toPath().resolve("licenses/" + licenseFilename))
          final List<String> expectedLines = header + licenseLines.collect { " " + it }
          assertLinesInFile(copyrightPath, expectedLines)
        }
      }
    } else {
      assert project.name.contains('rpm')
      checkLicense {
        onlyIf rpmExists
        doLast {
          String licenseFilename
          if (project.name.contains('oss-')) {
            licenseFilename = "APACHE-LICENSE-2.0.txt"
          } else {
            licenseFilename = "ELASTIC-LICENSE.txt"
          }
          final List<String> licenseLines = Files.readAllLines(rootDir.toPath().resolve("licenses/" + licenseFilename))
          final Path licensePath = packageExtractionDir.toPath().resolve("usr/share/elasticsearch/LICENSE.txt")
          assertLinesInFile(licensePath, licenseLines)
        }
      }
    }

    task checkNotice {
      dependsOn buildDist, checkExtraction
      onlyIf {
        (project.name.contains('deb') && dpkgExists.call(it)) || (project.name.contains('rpm') && rpmExists.call(it))
      }
      doLast {
        final List<String> noticeLines = Arrays.asList("Elasticsearch", "Copyright 2009-2018 Elasticsearch")
        final Path noticePath = packageExtractionDir.toPath().resolve("usr/share/elasticsearch/NOTICE.txt")
        assertLinesInFile(noticePath, noticeLines)
      }
    }
    check.dependsOn checkNotice

    task checkLicenseMetadata(type: LoggedExec) {
      dependsOn buildDist, checkExtraction
    }
    check.dependsOn checkLicenseMetadata
    if (project.name.contains('deb')) {
      checkLicenseMetadata { LoggedExec exec ->
        onlyIf dpkgExists
        final ByteArrayOutputStream output = new ByteArrayOutputStream()
        exec.commandLine 'dpkg-deb', '--info', "${-> buildDist.outputs.files.filter(debFilter).singleFile}"
        exec.standardOutput = output
        doLast {
          String expectedLicense
          if (project.name.contains('oss-')) {
            expectedLicense = "ASL-2.0"
          } else {
            expectedLicense = "Elastic-License"
          }
          final Pattern pattern = Pattern.compile("\\s*License: (.+)")
          final String info = output.toString('UTF-8')
          final String[] actualLines = info.split("\n")
          int count = 0
          for (final String actualLine : actualLines) {
            final Matcher matcher = pattern.matcher(actualLine)
            if (matcher.matches()) {
              count++
              final String actualLicense = matcher.group(1)
              if (expectedLicense != actualLicense) {
                throw new GradleException("expected license [${expectedLicense} for package info but found [${actualLicense}]")
              }
            }
          }
          if (count == 0) {
            throw new GradleException("expected license [${expectedLicense}] for package info but found none in:\n${info}")
          }
          if (count > 1) {
            throw new GradleException("expected a single license for package info but found [${count}] in:\n${info}")
          }
        }
      }
    } else {
      assert project.name.contains('rpm')
      checkLicenseMetadata { LoggedExec exec ->
        onlyIf rpmExists
        final ByteArrayOutputStream output = new ByteArrayOutputStream()
        exec.commandLine 'rpm', '-qp', '--queryformat', '%{License}', "${-> buildDist.outputs.files.singleFile}"
        exec.standardOutput = output
        doLast {
          String license = output.toString('UTF-8')
          String expectedLicense
          if (project.name.contains('oss-')) {
            expectedLicense = "ASL 2.0"
          } else {
            expectedLicense = "Elastic License"
          }
          if (license != expectedLicense) {
            throw new GradleException("expected license [${expectedLicense}] for [${-> buildDist.outputs.files.singleFile}] but was [${license}]")
          }
        }
      }
    }
  }
}