Check if installed packages satisfy .deb file dependencies

deb-package-checker.sh

#!/bin/bash
# Determine if .deb package dependencies are met


if [[ -z "$1" || "$1" == '--help' || "$1" == "-h" ]]; then
  echo "Usage $0 file.deb"
  exit 0
fi

if [[ ! -f "$1" ]]; then
  echo "No file found at $1"
  exit 1
fi

DEB_FILE="$1"
ARCH=`dpkg --print-architecture`
declare -a unmet_dependencies

function check_dependency {
  read -ra dep_pieces <<< "$1"
  package=${dep_pieces[0]}
  if [ ${#dep_pieces[@]} == 1 ]; then
    # No version conditional
    if `dpkg -l "$package" >> /dev/null 2>&1`; then
      echo "  Satisfied by $package"
      return 0
    else
      echo "  Package not installed: $package"
      return 2
    fi
  fi
  math_conditional=`echo ${dep_pieces[1]} | cut -c2-`
  case "$math_conditional" in
    "<") conditional="lt";; # Deprecated
    "<<") conditional="lt";;
    "<=") conditional="le";;
    "=") conditional="eq";;
    ">=") conditional="ge";;
    ">") conditional="gt";; # Deprecated
    ">>") conditional="gt";;
  esac
  version=${dep_pieces[2]: : -1}
  installed_version=`dpkg -l "$package" 2>&1 | grep "$package:$ARCH" | awk '{print $3}'`
  if [ -z "$installed_version" ]; then
    echo "  Arch-specific Package not installed: $package:$ARCH"
    installed_version=`dpkg -l "$package" 2>&1 | grep "$package " | awk '{print $3}'`
  fi
  if [ -z "$installed_version" ]; then
    echo "  Package not installed: $package"
    return 2
  fi
  if `dpkg --compare-versions $installed_version $conditional $version >> /dev/null 2>&1`; then
    echo "  Satisfied by $package $installed_version"
    return 0
  fi
  return 1
}

function check_dependency_list {
  exit_code=0
  IFS=',' read -ra dep_array <<< "$1"
  for dep_item in "${dep_array[@]}"; do
    echo "Checking:$dep_item"
    dep_satisfied=""
    IFS='|' read -ra dep_descriptions <<< "$dep_item"
    for dep_desc in "${dep_descriptions[@]}"; do
      if check_dependency "$dep_desc"; then
        dep_satisfied=true
        break
      fi
    done
    if [ -z "$dep_satisfied" ]; then
      echo "  Dependency not met:$dep_item"
      unmet_dependencies+=("$dep_item")
    fi
  done
  return $exit_code
}

control_file=$(mktemp "${TMPDIR:-/tmp/}$(basename $DEB_FILE).control.XXXXXXXXX")
dpkg-deb -I $DEB_FILE > $control_file
if [ ! $? ]; then
  echo "ERROR: Could not extract information from $DEB_FILE"
  exit 6
fi

for key in Pre-Depends Depends; do
  line=`grep ^" $key" $control_file`
  if [ ! -z "$line" ]; then
    echo "Checking on $key"
    depends=`echo $line | cut -c$((${#key} + 2))-`
    echo "Verifying ${key}:${depends}"
    check_dependency_list "$depends"
  fi
done

if [ ${#unmet_dependencies[@]} -gt 0 ]; then
  echo "UNMET DEPENDENCIES (${#unmet_dependencies[@]}):"
  for dep in "${unmet_dependencies[@]}"; do
    echo " $dep"
  done
  exit 5
fi

echo "Dependencies met!"
exit 0