Save all files in /var/lib/dpkg/info

Author: gtjoseph

install_and_cache_pkgs.sh

@@ -62,7 +62,7 @@ manifest_main=""
 log "Package list:"
 for package in ${packages}; do
   manifest_main="${manifest_main}${package},"
-  log "- ${package}"
+  test "${debug}" == "true" && log "- ${package}"
 done
 write_manifest "main" "${manifest_main}" "${cache_dir}/manifest_main.log"
 
@@ -95,7 +95,7 @@ installed_packages=$(get_installed_packages "${install_log_filepath}")
 log "Installed package list:"
 for installed_package in ${installed_packages}; do
   # Reformat for human friendly reading.  
-  log "- $(echo ${installed_package} | awk -F\= '{print $1" ("$2")"}')"
+  test "${debug}" == "true" && log "- $(echo ${installed_package} | awk -F\= '{print $1" ("$2")"}')"
 done
 
 log_empty_line
@@ -108,13 +108,16 @@ for installed_package in ${installed_packages}; do
   # Sanity test in case APT enumerates duplicates.
   if test ! -f "${cache_filepath}"; then
     read package_name package_ver < <(get_package_name_ver "${installed_package}")
-    log "  * Caching ${package_name} to ${cache_filepath}..."
+    test "${debug}" == "true" && log "  * Caching ${package_name} to ${cache_filepath}..."
 
+    # Get the entry in /var/lib/dpkg/status
+    mkdir -p /var/tmp/dpkg-restore || :
+    sed -n -r -e "/Package:\s+${package_name}$/,/^$/p" /var/lib/dpkg/status > /var/tmp/dpkg-restore/${package_name}.status
+    
     # Pipe all package files (no folders), including symlinks, their targets, and installation control data to Tar.
     tar -cf "${cache_filepath}" -C / --verbatim-files-from --files-from <(
-      { dpkg -L "${package_name}" &&
-        { get_install_script_filepath "/" "${package_name}" "preinst" ;
-        get_install_script_filepath "/" "${package_name}" "postinst" ; } ; } |
+      { dpkg -L "${package_name}" && echo "/var/tmp/dpkg-restore/${package_name}.status" &&
+        get_install_script_filepaths "/" "${package_name}" ; } |
       while IFS= read -r f; do
         if test -f "${f}" -o -L "${f}"; then
           get_tar_relpath "${f}"
@@ -128,7 +131,7 @@ for installed_package in ${installed_packages}; do
       done
     )
 
-    log "    done (compressed size $(du -h "${cache_filepath}" | cut -f1))."
+    test "${debug}" == "true" && log "    done (compressed size $(du -h "${cache_filepath}" | cut -f1))."
   fi
 
   # Comma delimited name:ver pairs in the all packages manifest.

lib.sh

@@ -27,6 +27,7 @@ function execute_install_script {
     test "${debug}" == "true" && log "- Executing ${install_script_filepath}..." || :
     # Don't abort on errors; dpkg-trigger will error normally since it is
     # outside its run environment.
+    export DPKG_MAINTSCRIPT_NAME="${3}"
     sudo sh ${echocmd} ${install_script_filepath} ${4} || true
     test "${debug}" == "true" && log "  done"
   fi
@@ -49,6 +50,11 @@ function get_install_script_filepath {
   test "${filepath}" && echo "${filepath}"
 }
 
+function get_install_script_filepaths {
+  # Filename includes arch (e.g. amd64).
+  ls -1 ${1}var/lib/dpkg/info/${2}:*.* ${1}var/lib/dpkg/info/${2}.* 2> /dev/null
+}
+
 ###############################################################################
 # Gets a list of installed packages from a Debian package installation log.
 # Arguments:

restore_pkgs.sh

@@ -50,12 +50,22 @@ mapfile -t packages <"${manifest_all}"
 cached_filecount="${#packages[@]}"
 log "Restoring ${cached_filecount} packages from cache..."
 
+restore_dpkg_status() {
+  echo "" >> "${1}/var/lib/dpkg/status"
+  cat "${1}/var/tmp/dpkg-restore/${2}.status" >> "${1}/var/lib/dpkg/status"
+}
+
 for package in "${packages[@]}"; do
   cached_filepath="${cache_dir}/${package}.tar"
   test "${debug}" == "true" && log "- ${package} restoring..." || :
   sudo tar -xf "${cached_filepath}" -C "${cache_restore_root}" > /dev/null
   test "${debug}" == "true" && log "  done" || :
-
+  package_name="${package%%=*}"
+  if test -f "${cache_restore_root}/var/tmp/dpkg-restore/${pkg}.status" ; then
+    sudo bash -c "$(declare -f restore_dpkg_status); restore_dpkg_status ${cache_restore_root} ${package_name} ;"
+  else
+    log "Status file ${cache_restore_root}/var/tmp/dpkg-restore/${pkg}.status not found"
+  fi 
   # Execute install scripts if available.    
   if test ${execute_install_scripts} == "true"; then
     # May have to add more handling for extracting pre-install script before extracting all files.