100 lines
4.1 KiB
Bash
100 lines
4.1 KiB
Bash
#!/bin/sh
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#VERSION=0.0.4
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# This script is written by Martynas Bendorius and DirectAdmin
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# It is used to gzip all emails in Maildir directory
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# Official DirectAdmin webpage: http://www.directadmin.com
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# Usage:
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# ./dovecot_compress.sh </home/user/imap/domain.com/email/Maildir>
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MYUID=`/usr/bin/id -u`
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if [ "${MYUID}" != 0 ]; then
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echo "You require Root Access to run this script";
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exit 0;
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fi
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if [ $# -lt 1 ]; then
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echo "Usage:";
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echo "$0 /home/user/imap/domain.com/email/Maildir";
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echo "or"
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echo "$0 all";
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echo "you gave #$#: $0 $1";
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exit 0;
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fi
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doCompressMaildir() {
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MAILDIR_PATH="${1}"
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if ! echo "${MAILDIR_PATH}" | grep -m1 -q '/Maildir$'; then
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echo "Path does not end with /Maildir: ${MAILDIR_PATH}. skipping.."
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continue
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fi
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if [ ! -d "${MAILDIR_PATH}/cur" ]; then
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echo "${MAILDIR_PATH}/cur does not exist, skipping..."
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continue
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fi
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cd "${MAILDIR_PATH}"
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if [ $? -ne 0 ]; then
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echo "Failed to cd to ${MAILDIR_PATH}. skipping..."
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continue
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fi
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echo "Checking for directories in ${MAILDIR_PATH}..."
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# https://wiki.dovecot.org/Plugins/Zlib
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find . -maxdepth 2 -mindepth 1 -type d \( -name 'cur' -o -name "new" \) -print0 | while read -d $'\0' directory; do {
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cd "${MAILDIR_PATH}/${directory}"
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if [ $? -ne 0 ]; then
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echo "Failed to cd to ${MAILDIR_PATH}/${directory}. Skipping..."
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continue
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fi
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TMPMAILDIR="${MAILDIR_PATH}/${directory}/../tmp"
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if [ -d "${MAILDIR_PATH}/${directory}" ] && [ ! -d "${MAILDIR_PATH}/${directory}"/tmp/cur ]; then
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mkdir -p "${TMPMAILDIR}"
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chown --reference="${MAILDIR_PATH}/${directory}" "${TMPMAILDIR}"
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fi
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find "${TMPMAILDIR}" -maxdepth 1 -group mail -type f -delete
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# ignore all files with "*,S=*" (dovecot needs to know the size of the email, when it's gzipped) and "*,*:2,*,*Z*" (dovecot recommends adding Z to the end of gzipped files just to know which ones are gzipped) in their names, also skip files that are also compressed (find skips all other 'exec' after first failure)
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# dovecot: Note that if the filename doesn't contain the ',S=<size>' before compression, adding it afterwards changes the base filename and thus the message UID. The safest thing to do is simply to not compress such files.
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find . -type f -name "*,S=*" ! -name "*,*:2,*,*Z*" ! -exec gzip -t {} 2>/dev/null \; -exec sh -c "gzip --best --stdout \$1 > \"${TMPMAILDIR}\"/\$1" x {} \; -exec sh -c "chown --reference=\$1 \"${TMPMAILDIR}\"/\$1" x {} \; -exec sh -c "chmod --reference=\$1 \"${TMPMAILDIR}\"/\$1" x {} \; -exec sh -c "touch --reference=\$1 \"${TMPMAILDIR}\"/\$1" x {} \;
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#if there are any compressed files, maildirlock the directory
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if ! find "${TMPMAILDIR}" -maxdepth 0 -type d -empty | grep -m1 -q '\.'; then
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echo "Size before compression: `du -sh \"${MAILDIR_PATH}/${directory}\" | awk '{print $1}'`"
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MAILDIRLOCK=/usr/libexec/dovecot/maildirlock
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if [ ! -x ${MAILDIRLOCK} ]; then
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MAILDIRLOCK=/usr/lib/dovecot/maildirlock
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fi
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if [ ! -x ${MAILDIRLOCK} ]; then
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echo "Unable to find ${MAILDIRLOCK}, exiting..."
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find "${TMPMAILDIR}" -maxdepth 1 -group mail -type f -delete
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exit 2
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fi
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# If we're able to create the maildirlock, then continue with moving compressed emails back
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#MAILDIRLOCK had a bug, which is patched in CB 2.0
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if PIDOFMAILDIRLOCK=`${MAILDIRLOCK} "${MAILDIR_PATH}" 10`; then
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# Move email only if it exists in destination folder, otherwise it's been removed at the time we converted it
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find "${TMPMAILDIR}" -maxdepth 1 -type f -exec sh -c "if [ -s \"\${1}\" ]; then mv -f \"\${1}\" \"${MAILDIR_PATH}/${directory}\"/; fi" x {} \;
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kill ${PIDOFMAILDIRLOCK}
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echo "Compressed ${MAILDIR_PATH}/${directory}..."
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# Remove dovecot index files to have no issues with mails
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find "${MAILDIR_PATH}" -type f -name dovecot.index\* -delete
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echo "Size after compression: `du -sh \"${MAILDIR_PATH}/${directory}\" | awk '{print $1}'`"
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else
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echo "Failed to lock: ${MAILDIR_PATH}" >&2
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find "${TMPMAILDIR}" -maxdepth 1 -group mail -type f -delete
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fi
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fi
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};
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done
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}
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if [ "${1}" = "all" ]; then
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cat /etc/virtual/*/passwd | cut -d: -f6 | sort | uniq | while read line; do {
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doCompressMaildir "${line}/Maildir"
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}
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done
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else
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doCompressMaildir "${1}"
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fi
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exit 0
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