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#!/bin/bash
set -eu
mail='user@example.com'
output_dir='/tmp/md5sums'
dirs=(
"$HOME/todo"
#/exemples/to/monitor
)
diff_two_last_by_mail()
{
if [ $# -lt 2 ]; then
return # nothing to done then not at least two files to compare
fi
diff -u <(zcat "$1") <(zcat "$2") \
| ifne mail -s "Changes in md5sums between $1 and $2" "$mail"
}
mkdir -p "$output_dir"
for dir in "${dirs[@]}"; do
basefn="$(printf "%s\n" "$dir" | sed 's:/:_:g;s/^_//;s/_$//')"
outputfn="$output_dir/${basefn}_$(date +%F_%T).md5sum.gz"
outputlistfn="$output_dir/${basefn}.tmplist"
# store file list: it avoids having the complete list in memory for all
# the time the md5sums processes will take to complete which can be
# consequent.
ionice -c 3 nice -n 19 find "$dir"/ -type f -print0 | sort -z \
> "$outputlistfn"
xargs --arg-file="$outputlistfn" -0 ionice -c 3 nice -n 19 md5sum -b \
| gzip -9 > "$outputfn"
diff_two_last_by_mail \
$(find "$output_dir"/ -name "${basefn}*.md5sum.gz" | sort | tail -n 2)
done
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