Fix postinst bugs and add docs to lib.

install_and_cache_pkgs.sh

@@ -64,10 +64,8 @@ done
 
 log_empty_line
 
-# Post install script install location.
+# Post install script install location {package name}.postinst
-postinst_filepath="/tmp/deb-ctrl-data/postinst"
+postinst_dirpath="/var/lib/dpkg/info/"
-postinst_dirpath=$(dirname ${postinst_filepath})
-mkdir "${postinst_dirpath}"
 
 installed_package_count=$(wc -w <<< "${installed_packages}")
 log "Caching ${installed_package_count} installed packages..."
@@ -87,12 +85,9 @@ for installed_package in ${installed_packages}; do
       sudo xargs tar -cf "${cache_filepath}" -C /
 
     # Append post install scripts if enabled and available.
-    if test "${execute_postinst}" == "true"; then
+    postinst_filepath=$(get_postinst_filepath "${package_name}")
-      dpkg -e pkg "${postinst_dirpath}"
+    if test "${execute_postinst}" == "true" && test ! -z "${postinst_filepath}"; then
-      if test -f "${postinst_filepath}"; then
       tar -caf "${cache_filepath}" "${postinst_filepath}"
-        rm "${postinst_filepath}"
-      fi
     fi
 
     log "    done (compressed size $(du -h "${cache_filepath}" | cut -f1))."

lib.sh

@@ -1,6 +1,13 @@
 #!/bin/bash
 
 # Sort these packages by name and split on commas.
+#######################################
+# Sorts given packages by name and split on commas.
+# Arguments:
+#   The comma delimited list of packages.
+# Returns:
+#   Sorted list of space delimited packages.
+#######################################
 function normalize_package_list {
   local stripped=$(echo "${1}" | sed 's/,//g')
   # Remove extraneous spaces at the middle, beginning, and end.
@@ -9,8 +16,14 @@ function normalize_package_list {
   echo "${sorted}"  
 }
 
-# Gets a list of installed packages as space delimited pairs with each pair colon delimited.
+#######################################
+# Gets a list of installed packages from a Debian package installation log.
+# Arguments:
+#   The filepath of the Debian install log.
+# Returns:
+#   The list of space delimited pairs with each pair colon delimited.
 #   <name>:<version> <name:version>...
+#######################################
 function get_installed_packages {   
   install_log_filepath="${1}"
   local regex="^Unpacking ([^ :]+)([^ ]+)? (\[[^ ]+\]\s)?\(([^ )]+)"  
@@ -30,7 +43,13 @@ function get_installed_packages {
   fi
 }
 
-# Split fully qualified package into name and version.
+#######################################
+# Splits a fully qualified package into name and version.
+# Arguments:
+#   The colon delimited package pair or just the package name.
+# Returns:
+#   The package name and version pair.
+#######################################
 function get_package_name_ver {
   IFS=\: read name ver <<< "${1}"
   # If version not found in the fully qualified package value.
@@ -40,12 +59,36 @@ function get_package_name_ver {
   echo "${name}" "${ver}"
 }
 
+#######################################
+# Gets the Debian postinst file location.
+# Arguments:
+#   Name of the unqualified package to search for.
+# Returns:
+#   Filepath of the postinst file, otherwise an empty string.
+#######################################
+function get_postinst_filepath {
+  filepath="/var/lib/dpkg/info/${1}"
+  if test -f "${filepath}"; then
+    echo "${filepath}"
+  else
+    echo ""
+  fi
+}
+
 function log { echo "$(date +%H:%M:%S)" "${@}"; }
 function log_err { >&2 echo "$(date +%H:%M:%S)" "${@}"; }
 
 function log_empty_line { echo ""; }
 
+#######################################
 # Writes the manifest to a specified file.
+# Arguments:
+#   Type of manifest being written.
+#   List of packages being written to the file.
+#   File path of the manifest being written.
+# Returns:
+#   Log lines from write.
+#######################################
 function write_manifest {  
   if [ ${#2} -eq 0 ]; then 
     log "Skipped ${1} manifest write. No packages to install."

restore_pkgs.sh

@@ -37,21 +37,16 @@ log_empty_line
 cached_pkg_filepaths=$(ls -1 "${cache_dir}"/*.tar | sort)
 cached_pkg_filecount=$(echo ${cached_pkg_filepaths} | wc -w)
 
-# Post install script restore location.
-postint_filepath="/tmp/deb-ctrl-data/postinst"
-
 log "Restoring ${cached_pkg_filecount} packages from cache..."
 for cached_pkg_filepath in ${cached_pkg_filepaths}; do
   log "- $(basename "${cached_pkg_filepath}") restoring..."
 
   sudo tar -xf "${cached_pkg_filepath}" -C "${cache_restore_root}" > /dev/null
 
-  if test "${execute_postinst}" == "true"; then
   # Execute post install script if available.
-    if test -f "${postint_filepath}"; then
+  postinst_filepath=$(get_postinst_filepath "${package_name}")
+  if test "${execute_postinst}" == "true" && test ! -z "${postinst_filepath}"; then
     sh -x ${postint_filepath}    
-      rm -fr ${postint_filepath}
-    fi
   fi
 
   log "  done"