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#!/bin/sh
# WARNING: REQUIRES /bin/sh
#
# - must run on /bin/sh on solaris 9
# - must run on /bin/sh on AIX 6.x
#
# Copyright:: Copyright (c) 2010-2015 Chef Software, Inc.
# License:: Apache License, Version 2.0
#
# Licensed 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 specific language governing permissions and
# limitations under the License.
#

# helpers.sh
############
# This section has some helper functions to make life easier.
#
# Outputs:
# $tmp_dir: secure-ish temp directory that can be used during installation.
############

# Check whether a command exists - returns 0 if it does, 1 if it does not
exists() {
  if command -v $1 >/dev/null 2>&1
  then
    return 0
  else
    return 1
  fi
}

# Output the instructions to report bug about this script
report_bug() {
  echo "Version: $version"
  echo ""
  echo "Please file a Bug Report at https://github.com/chef/omnitruck/issues/new"
  echo "Alternatively, feel free to open a Support Ticket at https://www.chef.io/support/tickets"
  echo "More Chef support resources can be found at https://www.chef.io/support"
  echo ""
  echo "Please include as many details about the problem as possible i.e., how to reproduce"
  echo "the problem (if possible), type of the Operating System and its version, etc.,"
  echo "and any other relevant details that might help us with troubleshooting."
  echo ""
}

checksum_mismatch() {
  echo "Package checksum mismatch!"
  report_bug
  exit 1
}

unable_to_retrieve_package() {
  echo "Unable to retrieve a valid package!"
  report_bug
  echo "Metadata URL: $metadata_url"
  if test "x$download_url" != "x"; then
    echo "Download URL: $download_url"
  fi
  if test "x$stderr_results" != "x"; then
    echo "\nDEBUG OUTPUT FOLLOWS:\n$stderr_results"
  fi
  exit 1
}

http_404_error() {
  echo "Omnitruck artifact does not exist for version $version on platform $platform"
  echo ""
  echo "Either this means:"
  echo "   - We do not support $platform"
  echo "   - We do not have an artifact for $version"
  echo ""
  echo "This is often the latter case due to running a prerelease or RC version of chef"
  echo "or a gem version which was only pushed to rubygems and not omnitruck."
  echo ""
  echo "You may be able to set your knife[:bootstrap_version] to the most recent stable"
  echo "release of Chef to fix this problem (or the most recent stable major version number)."
  echo ""
  echo "In order to test the version parameter, adventurous users may take the Metadata URL"
  echo "below and modify the '&v=<number>' parameter until you successfully get a URL that"
  echo "does not 404 (e.g. via curl or wget).  You should be able to use '&v=11' or '&v=12'"
  echo "succesfully."
  echo ""
  echo "If you cannot fix this problem by setting the bootstrap_version, it probably means"
  echo "that $platform is not supported."
  echo ""
  # deliberately do not call report_bug to suppress bug report noise.
  echo "Metadata URL: $metadata_url"
  if test "x$download_url" != "x"; then
    echo "Download URL: $download_url"
  fi
  if test "x$stderr_results" != "x"; then
    echo "\nDEBUG OUTPUT FOLLOWS:\n$stderr_results"
  fi
  exit 1
}

capture_tmp_stderr() {
  # spool up /tmp/stderr from all the commands we called
  if test -f "$tmp_dir/stderr"; then
    output=`cat $tmp_dir/stderr`
    stderr_results="${stderr_results}\nSTDERR from $1:\n\n$output\n"
    rm $tmp_dir/stderr
  fi
}

# do_wget URL FILENAME
do_wget() {
  echo "trying wget..."
  wget --user-agent="User-Agent: mixlib-install/2.1.8" -O "$2" "$1" 2>$tmp_dir/stderr
  rc=$?
  # check for 404
  grep "ERROR 404" $tmp_dir/stderr 2>&1 >/dev/null
  if test $? -eq 0; then
    echo "ERROR 404"
    http_404_error
  fi

  # check for bad return status or empty output
  if test $rc -ne 0 || test ! -s "$2"; then
    capture_tmp_stderr "wget"
    return 1
  fi

  return 0
}

# do_curl URL FILENAME
do_curl() {
  echo "trying curl..."
  curl -A "User-Agent: mixlib-install/2.1.8" --retry 5 -sL -D $tmp_dir/stderr "$1" > "$2"
  rc=$?
  # check for 404
  grep "404 Not Found" $tmp_dir/stderr 2>&1 >/dev/null
  if test $? -eq 0; then
    echo "ERROR 404"
    http_404_error
  fi

  # check for bad return status or empty output
  if test $rc -ne 0 || test ! -s "$2"; then
    capture_tmp_stderr "curl"
    return 1
  fi

  return 0
}

# do_fetch URL FILENAME
do_fetch() {
  echo "trying fetch..."
  fetch --user-agent="User-Agent: mixlib-install/2.1.8" -o "$2" "$1" 2>$tmp_dir/stderr
  # check for bad return status
  test $? -ne 0 && return 1
  return 0
}

# do_perl URL FILENAME
do_perl() {
  echo "trying perl..."
  perl -e 'use LWP::Simple; getprint($ARGV[0]);' "$1" > "$2" 2>$tmp_dir/stderr
  rc=$?
  # check for 404
  grep "404 Not Found" $tmp_dir/stderr 2>&1 >/dev/null
  if test $? -eq 0; then
    echo "ERROR 404"
    http_404_error
  fi

  # check for bad return status or empty output
  if test $rc -ne 0 || test ! -s "$2"; then
    capture_tmp_stderr "perl"
    return 1
  fi

  return 0
}

# do_python URL FILENAME
do_python() {
  echo "trying python..."
  python -c "import sys,urllib2; sys.stdout.write(urllib2.urlopen(urllib2.Request(sys.argv[1], headers={ 'User-Agent': 'mixlib-install/2.1.8' })).read())" "$1" > "$2" 2>$tmp_dir/stderr
  rc=$?
  # check for 404
  grep "HTTP Error 404" $tmp_dir/stderr 2>&1 >/dev/null
  if test $? -eq 0; then
    echo "ERROR 404"
    http_404_error
  fi

  # check for bad return status or empty output
  if test $rc -ne 0 || test ! -s "$2"; then
    capture_tmp_stderr "python"
    return 1
  fi
  return 0
}

# returns 0 if checksums match
do_checksum() {
  if exists sha256sum; then
    echo "Comparing checksum with sha256sum..."
    checksum=`sha256sum $1 | awk '{ print $1 }'`
    return `test "x$checksum" = "x$2"`
  elif exists shasum; then
    echo "Comparing checksum with shasum..."
    checksum=`shasum -a 256 $1 | awk '{ print $1 }'`
    return `test "x$checksum" = "x$2"`
  else
    echo "WARNING: could not find a valid checksum program, pre-install shasum or sha256sum in your O/S image to get valdation..."
    return 0
  fi
}

# do_download URL FILENAME
do_download() {
  echo "downloading $1"
  echo "  to file $2"

  url=`echo $1`
  if test "x$platform" = "xsolaris2"; then
    if test "x$platform_version" = "x5.9" -o "x$platform_version" = "x5.10"; then
      # solaris 9 lacks openssl, solaris 10 lacks recent enough credentials - your base O/S is completely insecure, please upgrade
      url=`echo $url | sed -e 's/https/http/'`
    fi
  fi

  # we try all of these until we get success.
  # perl, in particular may be present but LWP::Simple may not be installed

  if exists wget; then
    do_wget $url $2 && return 0
  fi

  if exists curl; then
    do_curl $url $2 && return 0
  fi

  if exists fetch; then
    do_fetch $url $2 && return 0
  fi

  if exists perl; then
    do_perl $url $2 && return 0
  fi

  if exists python; then
    do_python $url $2 && return 0
  fi

  unable_to_retrieve_package
}

# install_file TYPE FILENAME
# TYPE is "rpm", "deb", "solaris", "sh", etc.
install_file() {
  echo "Installing $project $version"
  case "$1" in
    "rpm")
      if test "x$platform" = "xnexus" || test "x$platform" = "xios_xr"; then
        echo "installing with yum..."
        yum install -yv "$2"
      else
        echo "installing with rpm..."
        rpm -Uvh --oldpackage --replacepkgs "$2"
      fi
      ;;
    "deb")
      echo "installing with dpkg..."
      dpkg -i "$2"
      ;;
    "bff")
      echo "installing with installp..."
      installp -aXYgd "$2" all
      ;;
    "solaris")
      echo "installing with pkgadd..."
      echo "conflict=nocheck" > $tmp_dir/nocheck
      echo "action=nocheck" >> $tmp_dir/nocheck
      echo "mail=" >> $tmp_dir/nocheck
      pkgrm -a $tmp_dir/nocheck -n $project >/dev/null 2>&1 || true
      pkgadd -G -n -d "$2" -a $tmp_dir/nocheck $project
      ;;
    "pkg")
      echo "installing with installer..."
      cd / && /usr/sbin/installer -pkg "$2" -target /
      ;;
    "dmg")
      echo "installing dmg file..."
      hdiutil detach "/Volumes/chef_software" >/dev/null 2>&1 || true
      hdiutil attach "$2" -mountpoint "/Volumes/chef_software"
      cd / && /usr/sbin/installer -pkg `find "/Volumes/chef_software" -name \*.pkg` -target /
      hdiutil detach "/Volumes/chef_software"
      ;;
    "sh" )
      echo "installing with sh..."
      sh "$2"
      ;;
    "p5p" )
      echo "installing p5p package..."
      pkg install -g "$2" $project
      ;;
    *)
      echo "Unknown filetype: $1"
      report_bug
      exit 1
      ;;
  esac
  if test $? -ne 0; then
    echo "Installation failed"
    report_bug
    exit 1
  fi
}

if test "x$TMPDIR" = "x"; then
  tmp="/tmp"
else
  tmp=$TMPDIR
fi
# secure-ish temp dir creation without having mktemp available (DDoS-able but not expliotable)
tmp_dir="$tmp/install.sh.$$"
(umask 077 && mkdir $tmp_dir) || exit 1

############
# end of helpers.sh
############


# script_cli_parameters.sh
############
# This section reads the CLI parameters for the install script and translates
#   them to the local parameters to be used later by the script.
#
# Outputs:
# $version: Requested version to be installed.
# $channel: Channel to install the product from
# $project: Project to be installed
# $cmdline_filename: Name of the package downloaded on local disk.
# $cmdline_dl_dir: Name of the directory downloaded package will be saved to on local disk.
############

# Defaults
channel="stable"
project="chef"

while getopts pnv:c:f:P:d: opt
do
  case "$opt" in

    v)  version="$OPTARG";;
    c)  channel="$OPTARG";;
    p)  channel="current";; # compat for prerelease option
    n)  channel="current";; # compat for nightlies option
    f)  cmdline_filename="$OPTARG";;
    P)  project="$OPTARG";;
    d)  cmdline_dl_dir="$OPTARG";;
    \?)   # unknown flag
      echo >&2 \
      "usage: $0 [-P project] [-c release_channel] [-v version] [-f filename | -d download_dir]"
      exit 1;;
  esac
done

shift `expr $OPTIND - 1`


# platform_detection.sh
############
# This section makes platform detection compatible with omnitruck on the system
#   it runs.
#
# Outputs:
# $platform: Name of the platform.
# $platform_version: Version of the platform.
# $machine: System's architecture.
############

#
# Platform and Platform Version detection
#
# NOTE: This should now match ohai platform and platform_version matching.
# do not invented new platform and platform_version schemas, just make this behave
# like what ohai returns as platform and platform_version for the server.
#
# ALSO NOTE: Do not mangle platform or platform_version here.  It is less error
# prone and more future-proof to do that in the server, and then all omnitruck clients
# will 'inherit' the changes (install.sh is not the only client of the omnitruck
# endpoint out there).
#

machine=`uname -m`
os=`uname -s`

if test -f "/etc/lsb-release" && grep -q DISTRIB_ID /etc/lsb-release && ! grep -q wrlinux /etc/lsb-release; then
  platform=`grep DISTRIB_ID /etc/lsb-release | cut -d "=" -f 2 | tr '[A-Z]' '[a-z]'`
  platform_version=`grep DISTRIB_RELEASE /etc/lsb-release | cut -d "=" -f 2`

  if test "$platform" = "\"cumulus linux\""; then
    platform="cumulus_linux"
  elif test "$platform" = "\"cumulus networks\""; then
    platform="cumulus_networks"
  fi

elif test -f "/etc/debian_version"; then
  platform="debian"
  platform_version=`cat /etc/debian_version`
elif test -f "/etc/Eos-release"; then
  # EOS may also contain /etc/redhat-release so this check must come first.
  platform=arista_eos
  platform_version=`awk '{print $4}' /etc/Eos-release`
  machine="i386"
elif test -f "/etc/redhat-release"; then
  platform=`sed 's/^\(.\+\) release.*/\1/' /etc/redhat-release | tr '[A-Z]' '[a-z]'`
  platform_version=`sed 's/^.\+ release \([.0-9]\+\).*/\1/' /etc/redhat-release`

  # If /etc/redhat-release exists, we act like RHEL by default
  if test "$platform" = "fedora"; then
    # FIXME: stop remapping fedora to el
    # FIXME: remove client side platform_version mangling and hard coded yolo
    # Change platform version for use below.
    platform_version="6.0"
  fi

  if test "$platform" = "xenserver"; then
    # Current XenServer 6.2 is based on CentOS 5, platform is not reset to "el" server should hanlde response
    platform="xenserver"
  else
    # FIXME: use "redhat"
    platform="el"
  fi

elif test -f "/etc/system-release"; then
  platform=`sed 's/^\(.\+\) release.\+/\1/' /etc/system-release | tr '[A-Z]' '[a-z]'`
  platform_version=`sed 's/^.\+ release \([.0-9]\+\).*/\1/' /etc/system-release | tr '[A-Z]' '[a-z]'`
  # amazon is built off of fedora, so act like RHEL
  if test "$platform" = "amazon linux ami"; then
    # FIXME: remove client side platform_version mangling and hard coded yolo, and remapping to deprecated "el"
    platform="el"
    platform_version="6.0"
  fi
# Apple OS X
elif test -f "/usr/bin/sw_vers"; then
  platform="mac_os_x"
  # Matching the tab-space with sed is error-prone
  platform_version=`sw_vers | awk '/^ProductVersion:/ { print $2 }' | cut -d. -f1,2`

  # x86_64 Apple hardware often runs 32-bit kernels (see OHAI-63)
  x86_64=`sysctl -n hw.optional.x86_64`
  if test $x86_64 -eq 1; then
    machine="x86_64"
  fi
elif test -f "/etc/release"; then
  machine=`/usr/bin/uname -p`
  if grep -q SmartOS /etc/release; then
    platform="smartos"
    platform_version=`grep ^Image /etc/product | awk '{ print $3 }'`
  else
    platform="solaris2"
    platform_version=`/usr/bin/uname -r`
  fi
elif test -f "/etc/SuSE-release"; then
  if grep -q 'Enterprise' /etc/SuSE-release;
  then
      platform="sles"
      platform_version=`awk '/^VERSION/ {V = $3}; /^PATCHLEVEL/ {P = $3}; END {print V "." P}' /etc/SuSE-release`
  else
      platform="suse"
      platform_version=`awk '/^VERSION =/ { print $3 }' /etc/SuSE-release`
  fi
elif test "x$os" = "xFreeBSD"; then
  platform="freebsd"
  platform_version=`uname -r | sed 's/-.*//'`
elif test "x$os" = "xAIX"; then
  platform="aix"
  platform_version="`uname -v`.`uname -r`"
  machine="powerpc"
elif test -f "/etc/os-release"; then
  . /etc/os-release
  if test "x$CISCO_RELEASE_INFO" != "x"; then
    . $CISCO_RELEASE_INFO
  fi

  platform=$ID
  platform_version=$VERSION
fi

if test "x$platform" = "x"; then
  echo "Unable to determine platform version!"
  report_bug
  exit 1
fi

#
# NOTE: platform manging in the install.sh is DEPRECATED
#
# - install.sh should be true to ohai and should not remap
#   platform or platform versions.
#
# - remapping platform and mangling platform version numbers is
#   now the complete responsibility of the server-side endpoints
#

major_version=`echo $platform_version | cut -d. -f1`
case $platform in
  # FIXME: should remove this case statement completely
  "el")
    # FIXME:  "el" is deprecated, should use "redhat"
    platform_version=$major_version
    ;;
  "debian")
    if test "x$major_version" = "x5"; then
      # This is here for potential back-compat.
      # We do not have 5 in versions we publish for anymore but we
      # might have it for earlier versions.
      platform_version="6"
    else
      platform_version=$major_version
    fi
    ;;
  "freebsd")
    platform_version=$major_version
    ;;
  "sles")
    platform_version=$major_version
    ;;
  "suse")
    platform_version=$major_version
    ;;
esac

# normalize the architecture we detected
case $machine in
  "x86_64"|"amd64"|"x64")
    machine="x86_64"
    ;;
  "i386"|"i86pc"|"x86"|"i686")
    machine="i386"
    ;;
  "sparc"|"sun4u"|"sun4v")
    machine="sparc"
    ;;
esac

if test "x$platform_version" = "x"; then
  echo "Unable to determine platform version!"
  report_bug
  exit 1
fi

if test "x$platform" = "xsolaris2"; then
  # hack up the path on Solaris to find wget, pkgadd
  PATH=/usr/sfw/bin:/usr/sbin:$PATH
  export PATH
fi

echo "$platform $platform_version $machine"

############
# end of platform_detection.sh
############


# fetch_metadata.sh
############
# This section calls omnitruck to get the information about the build to be
#   installed.
#
# Inputs:
# $channel:
# $project:
# $version:
# $platform:
# $platform_version:
# $machine:
# $tmp_dir:
#
# Outputs:
# $download_url:
# $sha256:
############

echo "Getting information for $project $channel $version for $platform..."

metadata_filename="$tmp_dir/metadata.txt"
metadata_url="https://omnitruck-direct.chef.io/$channel/$project/metadata?v=$version&p=$platform&pv=$platform_version&m=$machine"

do_download "$metadata_url"  "$metadata_filename"

cat "$metadata_filename"

echo ""
# check that all the mandatory fields in the downloaded metadata are there
if grep '^url' $metadata_filename > /dev/null && grep '^sha256' $metadata_filename > /dev/null; then
  echo "downloaded metadata file looks valid..."
else
  echo "downloaded metadata file is corrupted or an uncaught error was encountered in downloading the file..."
  # this generally means one of the download methods downloaded a 404 or something like that and then reported a successful exit code,
  # and this should be fixed in the function that was doing the download.
  report_bug
  exit 1
fi

download_url=`awk '$1 == "url" { print $2 }' "$metadata_filename"`
sha256=`awk '$1 == "sha256" { print $2 }' "$metadata_filename"`

############
# end of fetch_metadata.sh
############


# fetch_package.sh
############
# This section fetchs a package from $download_url and verifies its metadata.
#
# Inputs:
# $download_url:
# $tmp_dir:
# Optional Inputs:
# $cmdline_filename: Name of the package downloaded on local disk.
# $cmdline_dl_dir: Name of the directory downloaded package will be saved to on local disk.
#
# Outputs:
# $download_filename: Name of the downloaded file on local disk.
# $filetype: Type of the file downloaded.
############

filename=`echo $download_url | sed -e 's/^.*\///'`
filetype=`echo $filename | sed -e 's/^.*\.//'`

# use either $tmp_dir, the provided directory (-d) or the provided filename (-f)
if test "x$cmdline_filename" != "x"; then
  download_filename="$cmdline_filename"
elif test "x$cmdline_dl_dir" != "x"; then
  download_filename="$cmdline_dl_dir/$filename"
else
  download_filename="$tmp_dir/$filename"
fi

# ensure the parent directory where to download the installer always exists
download_dir=`dirname $download_filename`
(umask 077 && mkdir -p $download_dir) || exit 1

# check if we have that file locally available and if so verify the checksum
cached_file_available="false"
if test -f $download_filename; then
  echo "$download_filename already exists, verifiying checksum..."
  if do_checksum "$download_filename" "$sha256"; then
    echo "checksum compare succeeded, using existing file!"
    cached_file_available="true"
  else
    echo "checksum mismatch, downloading latest version of the file"
  fi
fi

# download if no local version of the file available
if test "x$cached_file_available" != "xtrue"; then
  do_download "$download_url"  "$download_filename"
  do_checksum "$download_filename" "$sha256" || checksum_mismatch
fi

############
# end of fetch_package.sh
############


# install_package.sh
############
# Installs a package and removed the temp directory.
#
# Inputs:
# $download_filename: Name of the file to be installed.
# $filetype: Type of the file to be installed.
# $version: The version requested. Used only for warning user if not set.
############

if test "x$version" = "x"; then
  echo
  echo "WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING"
  echo
  echo "You are installing an omnibus package without a version pin.  If you are installing"
  echo "on production servers via an automated process this is DANGEROUS and you will"
  echo "be upgraded without warning on new releases, even to new major releases."
  echo "Letting the version float is only appropriate in desktop, test, development or"
  echo "CI/CD environments."
  echo
  echo "WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING"
  echo
fi

install_file $filetype "$download_filename"

if test "x$tmp_dir" != "x"; then
  rm -r "$tmp_dir"
fi

############
# end of install_package.sh
############