add a script checking regularly (cron) integrity of files

1 files changed, 32 insertions, 0 deletions

diff --git a/scripts/files_integrity_croncheck.sh b/scripts/files_integrity_croncheck.sh
new file mode 100755
index 0000000..0cf99d8
--- /dev/null
+++ b/scripts/files_integrity_croncheck.sh
@@ -0,0 +1,32 @@
+#!/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"
+
+    find "$dir"/ -type f -print0 | sort -z | xargs -0 md5sum -b \
+        | gzip -9 > "$outputfn"
+
+    diff_two_last_by_mail \
+        $(find "$output_dir"/ -name "${basefn}*.md5sum.gz" | sort | tail -n 2)
+done