Update 2024-02-14 07:51 OpenBSD/amd64-x13

.bin/OLD/compress_maildir.sh

@@ -0,0 +1,42 @@
+#!/bin/ksh
+
+set -e # fail on error
+
+# mail permission
+UID=sdk
+GID=sdk
+MODE=600
+BACKUP=0 # if 1, bak directory will be created within maildir
+
+[[ -z $1 ]] && \
+    print "$0 <maildir>" && exit 2
+
+# conditions:
+#  - filename as size S=
+#  - filename does not end in Z (already compressed)
+#  - file must not return gzip compressed data (already compressed)
+# filename is cut from the file(1) output
+FILES=$(cd "$1/cur/" \
+        && find . -iname '*,S=*[^Z]' -exec file {} \; \
+            | grep -v 'gzip compressed data' \
+            | sed 's/: /!/' \
+            | cut -d '!' -f 1)
+
+[[ $BACKUP != 0 ]] && mkdir "$1/bak"
+
+# loop through mail and compress appending Z
+# sync mtime with original file
+# set used,group,permissions
+# remove original mail (or backup)
+for MAIL in $FILES; do
+    print "gzipping $1/cur/$MAIL to $1/cur/${MAIL}Z"
+    gzip -8 -S Z "$1/cur/$MAIL" -c > "$1/cur/${MAIL}Z"
+    touch -r "$1/cur/$MAIL" "$1/cur/${MAIL}Z"
+    chown $UID:$GID "$1/cur/${MAIL}Z"
+    chmod $MODE "$1/cur/${MAIL}Z"
+    if [[ $BACKUP != 0 ]]; then
+        mv "$1/cur/$MAIL" "$1/bak/$MAIL"
+    else
+        rm -f "$1/cur/$MAIL"
+    fi
+done