43 lines
1.1 KiB
Bash
43 lines
1.1 KiB
Bash
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#!/bin/ksh
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set -e # fail on error
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# mail permission
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UID=sdk
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GID=sdk
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MODE=600
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BACKUP=0 # if 1, bak directory will be created within maildir
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[[ -z $1 ]] && \
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print "$0 <maildir>" && exit 2
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# conditions:
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# - filename as size S=
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# - filename does not end in Z (already compressed)
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# - file must not return gzip compressed data (already compressed)
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# filename is cut from the file(1) output
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FILES=$(cd "$1/cur/" \
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&& find . -iname '*,S=*[^Z]' -exec file {} \; \
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| grep -v 'gzip compressed data' \
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| sed 's/: /!/' \
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| cut -d '!' -f 1)
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[[ $BACKUP != 0 ]] && mkdir "$1/bak"
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# loop through mail and compress appending Z
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# sync mtime with original file
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# set used,group,permissions
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# remove original mail (or backup)
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for MAIL in $FILES; do
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print "gzipping $1/cur/$MAIL to $1/cur/${MAIL}Z"
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gzip -8 -S Z "$1/cur/$MAIL" -c > "$1/cur/${MAIL}Z"
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touch -r "$1/cur/$MAIL" "$1/cur/${MAIL}Z"
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chown $UID:$GID "$1/cur/${MAIL}Z"
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chmod $MODE "$1/cur/${MAIL}Z"
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if [[ $BACKUP != 0 ]]; then
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mv "$1/cur/$MAIL" "$1/bak/$MAIL"
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else
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rm -f "$1/cur/$MAIL"
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fi
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done
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