add systemd timer email script

diff --git a/sysd-mail-once b/sysd-mail-once
new file mode 100755 (executable)
index 0000000..ccaee0a
--- /dev/null
+++ b/sysd-mail-once
@@ -0,0 +1,74 @@
+#!/bin/bash
+# Copyright (C) 2016 Ian Kelling
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+set -eE -o pipefail
+trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
+
+errors=3
+cbase=/var/local/cron-errors
+case "$1" in
+    -h|--help)
+        cat <<EOF
+Usage: sysd-log-once [-ERRORS] SERVICE COMMAND
+
+Use to wrap systemd timers and to email on repeated failure & success after failure
+
+Stores error counts in $c\$error_count
+
+-ERRORS:  ERRORS is the number of failurs to accumulate before mailing the error
+EOF
+        exit 0
+        ;;
+    -[0-9]*)
+        errors=${1#-}
+        shift
+        ;;
+esac
+service=$1
+shift
+
+c=$cbase/$service
+
+glob="$c[0-9]*"
+arr=($glob); file="${arr[0]}"; [[ $glob != "$file" ]] || file=
+u=${USER:-root}
+[[ -d $cbase ]] || mkdir -p $cbase
+
+cursor=$(journalctl --show-cursor -qn0|sed 's/^\s*--\scursor:\s*//')
+if "$@"; then
+    if [[ $file ]]; then
+        rm -f $file
+        if [[ $file == $c$errors ]]; then
+            echo | mail -s "$HOSTNAME: $service success" $u@localhost
+        fi
+    fi
+else
+    if [[ $file ]]; then
+        i=${file#$c}
+        if (( i < errors )); then
+            new_file=$c$((i+1))
+            mv $file $new_file
+            file=$new_file
+            if [[ $file == $c$errors ]]; then
+                journalctl -u $service.service --after-cursor=$cursor | \
+                    mail -s "$HOSTNAME: $service failure" $u@localhost
+            fi
+        fi
+    else
+        file=${c}1
+        touch $file
+    fi
+fi