When die()ing, write message to syslog.

lumberjack

@@ -8,7 +8,7 @@
 
 # Script details.
 NAME="${0##*/}"
-VERSION="0.3.2"
+VERSION="0.4.0"
 
 
 # Functions.
@@ -68,6 +68,7 @@ die() {
   # $1		The text of the error message to display on stderr.
 
   (( DEBUG == 1 )) && printf "%s: %s: %s\\n" "$(date "+%Y%m%d %H%M%S.%N")" "die" "$1" >>"$DEBUG_FILE"
+  syslog "err" "$1"
   printf "%s: %s\\n" "$NAME" "$1" >&2
   exit 1
 }
@@ -87,6 +88,14 @@ display_help() {
 	  -f		Request flushing of the log file to disk after every write.
 	                This may significantly reduce performance and result in a lot of
 	                disk writes.  Best to let the kernel do appropriate buffering.
+	  -g <group>	Set name of the group to run with.  With this option, as soon as
+	                $NAME starts it will re-exec itself to run as this group.
+	                Log files created by $NAME will be owned by this group.  The
+	                default is to run as a primary group of any user given by '-u'
+	                or the user that executed $NAME, which is usually root.
+	                When combind with '-u', the group $NAME will run under is no
+	                longer the primary group of that user but will be this group.
+	                This option is only available to root.
 	  -h		Display this help.
 	  -i <pipe>	Read input from the pipe/FIFO at <pipe>, rather than stdin.
 	                If the pipe/FIFO does not exist, it will be created.  Use '-o'
@@ -223,7 +232,7 @@ open_fd() {
   # shellcheck disable=SC1083
   if ! { exec {FDS["$1"]}>>"$2"; } 2>/dev/null; then
     (( FLAGS[${1}_open-fd-fail] == 0 )) && {
-      syslog "error" "failed to open log file for writing: $2"
+      syslog "err" "failed to open log file for writing: $2"
       FLAGS[${1}_open-fd-fail]=1
     }
     return 1
@@ -289,6 +298,9 @@ sigterm_handler() {
     close_fd "$SITE"
   done
   disown -a
+  (( FLAGS[created-fifo] == 1 )) && {
+    rm -f "$INPUT" 2>/dev/null || syslog "warn" "failed to remove pipe/fifo: $INPUT"
+  }
   exit 0
 }
 
@@ -355,6 +367,7 @@ PIPE_UMASK="066"
 PIPE_OWNER=""
 SYSLOG_FACILITY="user"
 RUNAS_USER=""
+RUNAS_GROUP=""
 FLAGS=([flush]=0 [raw]=0 [compress]=0 [make-parents]=0 [created-fifo]=0 [timed-out]=0 [basedir-vanished]=0 [basedir-notdir]=0)
 
 # trap signals.
@@ -392,6 +405,14 @@ while :; do
       shift
       continue
       ;;
+    -g)
+      # Set the group to run as.
+      (( UID != 0 )) && die "only root can use -g"
+      getent group "$2" >/dev/null 2>&1 || die "invalid group given for -g: $2"
+      RUNAS_GROUP="$2"
+      shift 2
+      continue
+      ;;
     -h|-help|--help)
       # Show the help screen and exit.
       display_help
@@ -540,23 +561,22 @@ TEMPLATE="$2"
 
 # If input is to be a pipe/FIFO, create it if necessary.
 [[ -n "$INPUT" ]] && {
-  if [[ ! -e "$INPUT" ]]; then
+  [[ ! -e "$INPUT" ]] || [[ ! -p "$INPUT" ]] && {
     umask "$PIPE_UMASK"
+    rm -f "$INPUT"
     mkfifo "$INPUT" 2>/dev/null || die "failed to create pipe/FIFO: $INPUT"
     FLAGS[created-fifo]=1
     [[ -n "$PIPE_OWNER" ]] && { chown "$PIPE_OWNER" "$INPUT" >/dev/null 2>&1 || die "failed to chown pipe/FIFO: $INPUT"; }
-  elif [[ ! -p "$INPUT" ]]; then
-    die "not a pipe/FIFO: $INPUT"
-  fi
+  }
 }
 
 # Apply user and setting.
-[[ -n "$RUNAS_USER" ]] && {
+[[ -n "$RUNAS_USER" ]] || [[ -n "$RUNAS_GROUP" ]] && {
   SETPRIV="$(command -v setpriv)"
   if [[ -n "$SETPRIV" ]]; then
-    exec "$SETPRIV" --keep-groups --reuid "$RUNAS_USER" --regid "$RUNAS_USER" -- "$0" "${ORIG_ARGS[@]}" "$BASEDIR" "$TEMPLATE" || die "failed to exec to change user"
+    exec "$SETPRIV" --keep-groups --reuid "${RUNAS_USER:-$(whoami)}" ${RUNAS_GROUP:+--regid "$RUNAS_GROUP"} -- "$0" "${ORIG_ARGS[@]}" "$BASEDIR" "$TEMPLATE" || die "failed to exec to change user/group"
   else
-    die "cannot exec to change user: setpriv not found"
+    die "cannot exec to change user/group: setpriv not found"
   fi
 }
 
@@ -594,7 +614,7 @@ while :; do
     }
   elif (( ERR != 0 )); then
     # Unhandled error - log the issue and continue.
-    syslog "error" "unhandled return code from 'read': $ERR"
+    syslog "err" "unhandled return code from 'read': $ERR"
     continue
   fi
 
@@ -602,7 +622,7 @@ while :; do
   # Note: We won't make this directory ourselves - as it's the base directory it should exist on the system to start with.
   if [[ ! -e "$BASEDIR" ]]; then
     (( FLAGS[basedir-vanished] == 0 )) && {
-      syslog "error" "base directory has vanished"
+      syslog "err" "base directory has vanished"
       FLAGS[basedir-vanished]=1
     }
     continue
@@ -616,7 +636,7 @@ while :; do
   # Make sure the base path is a directory.
   if ! is_dir "$BASEDIR"; then
     (( FLAGS[basedir-notdir] == 0 )) && {
-      syslog "error" "base path is no longer a directory"
+      syslog "err" "base path is no longer a directory"
       FLAGS[basedir-notdir]=1
     }
     continue
@@ -676,7 +696,7 @@ while :; do
         rm -rf "${BASEDIR:?}/${LINKFILE_EXPANDED//\{\}/$SITE}"
         if ! ln -sfr "$FILENAME" "$BASEDIR/${LINKFILE_EXPANDED//\{\}/$SITE}"; then
           (( FLAGS[${SITE}_fix-link] == 0 )) && {
-            syslog "error" "failed to fix link: $BASEDIR/${LINKFILE_EXPANDED//\{\}/$SITE}"
+            syslog "err" "failed to fix link: $BASEDIR/${LINKFILE_EXPANDED//\{\}/$SITE}"
             FLAGS[${SITE}_fix-link]=1
           }
           continue
@@ -700,7 +720,7 @@ while :; do
     # If in raw mode, we need a placeholder for the FDS array element as LOG_VHOST would normally be unset.
     if (( FLAGS[raw] == 0 )); then
       [[ ! "$LOG_VHOST" ]] && {
-        syslog "error" "empty VirtualHost site identifier"
+        syslog "err" "empty VirtualHost site identifier"
         continue
       }
     else
@@ -753,7 +773,7 @@ while :; do
         rm -rf "${BASEDIR:?}/${LINKFILE_EXPANDED//\{\}/$LOG_VHOST}"
         if ! ln -sfr "$FILENAME" "$BASEDIR/${LINKFILE_EXPANDED//\{\}/$LOG_VHOST}" 2>/dev/null; then
           (( FLAGS[${LOG_VHOST}_create-link] == 0 )) && {
-            syslog "error" "failed to create link: $BASEDIR/${LINKFILE_EXPANDED//\{\}/$LOG_VHOST}"
+            syslog "err" "failed to create link: $BASEDIR/${LINKFILE_EXPANDED//\{\}/$LOG_VHOST}"
             FLAGS[${LOG_VHOST}_create-link]=1
           }
           continue