fix: systemd has less environment vars

[log-quiet] / sysd-mail-once

diff --git a/sysd-mail-once b/sysd-mail-once
index 711479c84b1dbecdeefbfa76b64122eaeb09467a..32aa02d2dbd5911c72656b1b5f39595acfc7c1d6 100755 (executable)
--- a/sysd-mail-once
+++ b/sysd-mail-once
@@ -18,12 +18,18 @@ set -eE -o pipefail
 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
 
 errors=3
 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
 
 errors=3

-cbase=$HOME/sysd-mail-once-state
-case "$1" in
-  -h|--help)
-    cat <<EOF
-Usage: sysd-log-once [-ERRORS] SERVICE COMMAND [ARGS...]
-For systemd timers, email on repeated failure & success after failure.
+tmp=(~)
+cbase="${tmp[0]}/sysd-mail-once-state"
+to=root
+dryrun=false
+while [[ $1 == -* ]]; do
+  case "$1" in
+    -h|--help)
+      cat <<EOF
+Usage: sysd-mail-once [-t TO_ADDRESS] [-ERRORS] SERVICE COMMAND [COMMAND_ARGS...]
+
+For use with systemd timers, to email (with exim) on repeated failure &
+success after failure.

 
 In the service triggered by the timer, prepend this script to the ExecStart.
 The email will contain the service's logs for the last ERRORS runs.
 
 In the service triggered by the timer, prepend this script to the ExecStart.
 The email will contain the service's logs for the last ERRORS runs.


@@ -31,25 +37,78 @@ The email will contain the service's logs for the last ERRORS runs.
 
 Stores error counts in $cbase
 
 
 Stores error counts in $cbase
 

--ERRORS:  ERRORS is the number of failurs to accumulate before mailing the error.
-          Default is 3.
+-ERRORS         ERRORS is the number of failurs to accumulate before mailing the error.
+                Default is 3.
+
+-t TO_ADDRESS   Address to email about errors
+-n              Dry run. Execute command but only print out what we would do in response.

 EOF
 EOF

-    exit 0
-    ;;
-  -[0-9]*)
-    errors=${1#-}
-    shift
-    ;;
-esac
-service=$1
+      exit 0
+      ;;
+    -[0-9]*)
+      errors=${1#-}
+      ;;
+    -t)
+      to="$2"
+      shift
+      ;;
+    -n)
+      dryrun=true
+      ;;
+    *)
+      echo "error: unexpected arg: $1"
+      exit 1
+      ;;
+  esac
+  shift
+done
+
+if (( $# < 2 )); then
+  echo "error: expected at least 2 args after options. args:"
+  exit 1
+fi
+
+service="$1"

 shift
 
 shift
 

+
+# maybe run, depending on $dryrun
+m() {
+  if $dryrun; then
+    printf "%s\n" "$*"
+  else
+    "$@"
+  fi
+}
+# maybe run, with stdin
+mi() {
+  if $dryrun; then
+    printf "%s <<'EOF'\n" "$*"
+    cat
+    echo EOF
+  else
+    "$@"
+  fi
+}
+e() {
+  printf "dryrun: %s\n" "$*"
+}
+

 c=$cbase/$service # c for command file path base
 
 c=$cbase/$service # c for command file path base
 

-glob="$c[0-9]*"
+if $dryrun; then
+  e "c=$c"
+fi
+
+glob="${c}[0-9]*"

 arr=($glob); file="${arr[0]}"; [[ $glob != "$file" ]] || file=
 arr=($glob); file="${arr[0]}"; [[ $glob != "$file" ]] || file=

-u=${USER:-root}
-[[ -d $cbase ]] || mkdir -p $cbase
+if [[ $dryrun && $file ]]; then
+  e "file=$file"
+fi
+
+if ! [[ -d $cbase ]]; then
+  mkdir -p $cbase
+fi

 
 if [[ ! $file ]]; then
   cursor=$(journalctl --show-cursor -qn0|sed 's/^\s*--\scursor:\s*//')
 
 if [[ ! $file ]]; then
   cursor=$(journalctl --show-cursor -qn0|sed 's/^\s*--\scursor:\s*//')


@@ -60,10 +119,10 @@ code=0
 if (( code )); then
   send_mail=false
   if [[ $file ]]; then
 if (( code )); then
   send_mail=false
   if [[ $file ]]; then

-    i=${file#$c}
+    i=${file#"$c"}

     if (( i < errors )); then
       new_file=$c$((i+1))
     if (( i < errors )); then
       new_file=$c$((i+1))

-      mv $file $new_file
+      m mv $file $new_file

       file=$new_file
       if [[ $file == $c$errors ]]; then
         send_mail=true
       file=$new_file
       if [[ $file == $c$errors ]]; then
         send_mail=true


@@ -71,20 +130,36 @@ if (( code )); then
     fi
   else
     file=${c}1
     fi
   else
     file=${c}1

-    printf "%s\n" "$cursor" >$file
+    if $dryrun; then
+      printf "dryrun: creating $file, contents: %s\n" "$cursor"
+    else
+      printf "%s\n" "$cursor" >$file
+    fi

     if (( errors == 1 )); then
       send_mail=true
     fi
   fi
   if $send_mail; then
     if (( errors == 1 )); then
       send_mail=true
     fi
   fi
   if $send_mail; then

-    journalctl -u $service.service --after-cursor=$(<$file) | \
-      mail -s "$HOSTNAME: $service exit code: $code" $u@localhost
+    echo "sysd-mail-once: emailing on $errors errors. exit code: $code"
+    mi exim -odf -t <<EOF
+To: $to
+From: $(id -u -n)@$(hostname -f)
+Subject: $HOSTNAME: $service exit code: $code
+
+$(journalctl -u $service.service --after-cursor="$(<$file)")
+EOF

   fi
 else
   if [[ $file ]]; then
   fi
 else
   if [[ $file ]]; then

-    rm -f $file
+    m rm -f $file

     if [[ $file == $c$errors ]]; then
     if [[ $file == $c$errors ]]; then

-      echo | mail -s "$HOSTNAME: $service success" $u@localhost
+      echo "sysd-mail-once: emailing success after >= $errors errors."
+      mi exim -odf -t <<EOF
+To: $to
+From: $(id -u -n)@$(hostname -f)
+Subject: $HOSTNAME: $service success
+
+EOF

     fi
   fi
 fi
     fi
   fi
 fi