Add a copy of a script allowing to process an existing maildir

source : http://www.dslreports.com/forum/remark,26270484 (retrieved throug google's cache)

encmaildir.sh

@@ -0,0 +1,89 @@
+#!/bin/bash
+#
+# GPLv2
+# GPG Encrypt a Maildir using gpgencmail.pl, removing any S= or W= virtual flags.
+# Sep 02, 2011
+#
+# Change log:
+#     Sep 03, 2011
+#               - Temporary file is based on file_owner to avoid issues with permission differences.
+#               - Temporary file is removed after run.
+#               - Optional arguments passed to 'find'.
+#               - Full paths to binaries.
+#               - Removed unneccessary need of 'cat', 'grep', etc.
+#     Sep 04, 2011
+#               - Don't remove Dovecot index/uid unless messages have been GPG encrypted.
+#               - Adjust file tests to not just use -e
+#               - Quote all file operations
+#     Sep 05, 2011
+#               - Don't arbitrarily copy files, only overwrite the file in ~/Maildir if it differs after calling gpgencmail.pl
+#               - Only rebuild the index if we have modified ~/Maildir
+
+# source : http://www.dslreports.com/forum/remark,26270484 (retrieved throug google's cache), slightly modified by olivier.berger@it-sudparis.eu
+
+#ENCRYPTER=/usr/local/bin/gpgencmail.pl
+ENCRYPTER=~/bin/gpgit.pl
+  
+if [[ -z "$1" || -z "$2" || -z "$3" ]]; then
+  /bin/echo "Usage is ./encmaildir.sh /path/to/Maildir certificate_user@domain.com file_owner {optional arguments passed to 'find' for messages such as '-mtime 0'}"
+  exit 0
+fi
+  
+if [ ! -d "$1" ]; then
+        /bin/echo "The directory of '$1' does not exist!"
+        exit 0
+fi
+  
+#Does this key exist?
+/usr/bin/gpg --list-keys "$2" > /dev/null 2>&1
+if [ $? -gt 0 ]; then
+     /bin/echo "A GPG key for '$2' could not be found!"
+     exit 0
+fi
+  
+#Find all files in the Maildir specified.
+/bin/echo "Calling /usr/bin/find \"$1\" -type f -regex '.*/\(cur\|new\)/.*' $4"
+
+/usr/bin/find "$1" -type f -regex '.*/\(cur\|new\)/.*' $4 | while read line; do
+
+#    echo "cat $line | $ENCRYPTER --encrypt-mode prefer-inline $2 > /tmp/msg_$3"
+#    echo "Processing : $(grep '^Subject:'  $line)"
+     cat "$line" | $ENCRYPTER --encrypt-mode prefer-inline "$2" > "/tmp/msg_$3"
+  
+     #Check to see if there are differences between the existing Maildir file and what was created by gpgencmail.pl
+     /usr/bin/diff -qa "$line" "/tmp/msg_$3" > /dev/null 2>&1;
+     if [ $? -gt 0 ]; then
+          #Preserve timestamps, set ownership.
+          /bin/chown $3:$3 "/tmp/msg_$3"
+          /bin/chmod 600   "/tmp/msg_$3"
+          /usr/bin/touch   "/tmp/msg_$3" --reference="$line"
+  
+          #Unlink the original Maildir message
+#	  echo " /usr/bin/unlink $line"
+          /usr/bin/unlink "$line"
+  
+          #Strip message sizes, retain experimental flags and status flags, and copy the file over.
+          STRIPSIZES=$(/bin/echo "$line"|/bin/sed -e 's/W=[[:digit:]]*//' -e 's/S=[[:digit:]]*//' -e 's/,,//' -e 's/,:2/:2/')
+#	  echo "/bin/cp -av /tmp/msg_$3 $STRIPSIZES"
+          /bin/cp -av "/tmp/msg_$3" "$STRIPSIZES"
+  
+          #Indexes must be rebuilt, we've modified Maildir.
+          /usr/bin/touch "/tmp/rebuild_index_$3"
+     else
+          /bin/echo "Not copying, no differences between '/tmp/msg_$3' and '$line'"
+     fi
+  
+        #Remove the temporary file
+        /usr/bin/unlink "/tmp/msg_$3"
+done
+  
+#Remove Dovecot index and uids for regeneration.
+if [ -f "/tmp/rebuild_index_$3" ]; then
+        /bin/echo "Removing Dovecot indexes and uids"
+        /usr/bin/find "$1" -type f -regex '.*\(dovecot-\|dovecot\.\|\.uidvalidity\).*' -delete
+  
+        #Remove the temporary file
+        /usr/bin/unlink "/tmp/rebuild_index_$3"
+else
+        /bin/echo "No messages found needing GPG encryption, not removing Dovecot indexes and UIDs."
+fi