Improvements (cronmail) and fixes in mail utilities.

2026-05-02 23:46:29 +02:00
parent 5b0b5ae2d3
commit 14d499350e
5 changed files with 65 additions and 12 deletions
@@ -0,0 +1,52 @@
+#!/bin/bash
+#
+# This is a sendmail to mailx format converter script.
+# It receives a well-formed email text from standard input, parses it,
+# and invokes a POSIX mailx compliant mail user agent with the result.
+#
+# It is primarily designed to use with crond. To activate
+# use CRONDARGS="-m pathname_to_cronmail" in/etc/default/cron or
+# /etc/sysconfig/crond configuration.
+#
+# Author: Kovács Zoltán <kovacsz@marcusconsulting.hu>
+# License: GNU/GPL v3+ (https://www.gnu.org/licenses/gpl-3.0.en.html)
+# 2026-05-02 v0.1 Initila release.
+
+# Initialisations.
+#
+SUBJECT=""
+RECIPIENT="$USER"			# Default recipient.
+MESSAGE=""
+MUA="/usr/local/bin/mail"		# Custom mail user agent script.
+
+# Parsing the stdin line by line.
+#
+while IFS= read -r line
+do
+    # Parses the recipient.
+    if [[ "$line" =~ ^(T|t)o:\ .*$ ]]; then
+	RECIPIENT="${line#*: }"
+    # Parses the subject line.
+    elif [[ "$line" =~ ^(S|s)ubject:\ .*$ ]]; then
+	SUBJECT="${line#*: }"
+    # Message body starts with an empty line.
+    elif [[ "$line" =~ ^$ ]]; then
+	MESSAGE+="\n"
+    # Collects the message body lines.
+    # The first empty line will be stripped.
+    elif [ -n "$MESSAGE" ]; then
+	[[ "$MESSAGE" = "\n" ]] \
+	&& MESSAGE="$line\n" \
+	|| MESSAGE+="$line\n"
+    fi
+done
+
+# Calls the mail user agent.
+#
+if [ -x "$MUA" ]; then
+    if [ -n "$SUBJECT" -o -n "$MESSAGE" ]; then
+	echo -e "$MESSAGE" | "$MUA" -s "$SUBJECT" "$RECIPIENT"
+    fi
+fi
+
+# That's all, Folks! :)