Merge ramayana.hindu.god:/home/tsmith/m/bk/maint/51-b29992

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/51

scripts/mysqld_safe.sh

@@ -14,12 +14,17 @@
 KILL_MYSQLD=1;
 MYSQLD=
 niceness=0
-# Default on, unless --log-error is specified (and before options are parsed)
-syslog=2
+# Initial logging status: error log is not open, and not using syslog
+logging=init
+want_syslog=0
+syslog_tag=
 user=@MYSQLD_USER@
 pid_file=
 err_log=
 
+syslog_tag_mysqld=mysqld
+syslog_tag_mysqld_safe=mysqld_safe
+
 trap '' 1 2 3 15			# we shouldn't let anyone kill us
 
 umask 007
@@ -46,7 +51,8 @@ Usage: $0 [OPTIONS]
   --nice=NICE                Set the scheduling priority of mysqld
   --skip-kill-mysqld         Don't try to kill stray mysqld processes
   --syslog                   Log messages to syslog with 'logger'
-  --skip-syslog              Log messages to error log
+  --skip-syslog              Log messages to error log (default)
+  --syslog-tag=TAG           Pass -t "mysqld-TAG" to 'logger'
 
 All other options are passed to the mysqld program.
 
@@ -54,18 +60,46 @@ EOF
         exit 1
 }
 
+my_which ()
+{
+  save_ifs="${IFS-UNSET}"
+  IFS=:
+  for file
+  do
+    for dir in $PATH
+    do
+      if [ -f "$dir/$file" ]
+      then
+        echo "$dir/$file"
+        continue 2
+      fi
+    done
+    return 1  # Failure, didn't find file in path
+  done
+  if [ "$save_ifs" = UNSET ]
+  then
+    unset IFS
+  else
+    IFS="$save_ifs"
+  fi
+  return 0  # Success
+}
+
 log_generic () {
   priority="$1"
   shift
 
   msg="`date +'%y%m%d %H:%M:%S'` mysqld_safe $*"
   echo "$msg"
-  if [ $syslog -eq 0 ]
-  then
-    echo "$msg" >> "$err_log"
-  else
-    logger -i -t mysqld_safe -p "$priority" "$*"
-  fi
+  case $logging in
+    init) ;;  # Just echo the message, don't save it anywhere
+    file) echo "$msg" >> "$err_log" ;;
+    syslog) logger -t "$syslog_tag_mysqld_safe" -p "$priority" "$*" ;;
+    *)
+      echo "Internal program error (non-fatal):" \
+           " unknown logging method '$logging'" >&2
+      ;;
+  esac
 }
 
 log_error () {
@@ -78,15 +112,23 @@ log_notice () {
 
 eval_log_error () {
   cmd="$1"
-  if [ $syslog -eq 0 ]
-  then
-    cmd="$cmd >> "`shell_quote_string "$err_log"`" 2>&1"
-  else
-    # mysqld often (not always) prefixes messages on stdout with a
-    # timestamp in the form of '%y%m%d %H:%M:%S '; this is redundant
-    # when logging via syslog, so strip it
-    cmd="$cmd 2>&1 | sed -e 's/^[0-9]\{6\} [0-9:]\{8\}  *//' | logger -i -t mysqld -p daemon.error"
-  fi
+  case $logging in
+    file) cmd="$cmd >> "`shell_quote_string "$err_log"`" 2>&1" ;;
+    syslog)
+      # mysqld often prefixes its messages with a timestamp, which is
+      # redundant when logging to syslog (which adds its own timestamp)
+      # However, we don't strip the timestamp with sed here, because
+      # sed buffers output (only GNU sed supports a -u (unbuffered) option)
+      # which means that messages may not get sent to syslog until the
+      # mysqld process quits.
+      cmd="$cmd 2>&1 | logger -t '$syslog_tag_mysqld' -p daemon.error"
+      ;;
+    *)
+      echo "Internal program error (non-fatal):" \
+           " unknown logging method '$logging'" >&2
+      ;;
+  esac
+
   #echo "Running mysqld: [$cmd]"
   eval "$cmd"
 }
@@ -138,8 +180,9 @@ parse_arguments() {
       --nice=*) niceness="$val" ;;
       --open-files-limit=*) open_files="$val" ;;
       --skip-kill-mysqld*) KILL_MYSQLD=0 ;;
-      --syslog) syslog=1 ;;
-      --skip-syslog) syslog=0 ;;
+      --syslog) want_syslog=1 ;;
+      --skip-syslog) want_syslog=0 ;;
+      --syslog-tag=*) syslog_tag="$val" ;;
       --timezone=*) TZ="$val"; export TZ; ;;
 
       --help) usage ;;
@@ -252,7 +295,19 @@ parse_arguments `$print_defaults $defaults --loose-verbose mysqld_safe safe_mysq
 parse_arguments PICK-ARGS-FROM-ARGV "$@"
 
 # Determine what logging facility to use
-if [ -n "$err_log" -o $syslog -eq 0 ]
+
+# Ensure that 'logger' exists, if it's requested
+if [ $want_syslog -eq 1 ]
+then
+  my_which logger > /dev/null 2>&1
+  if [ $? -ne 0 ]
+  then
+    log_error "--syslog requested, but no 'logger' program found."
+    want_syslog=0
+  fi
+fi
+
+if [ -n "$err_log" -o $want_syslog -eq 0 ]
 then
   if [ -n "$err_log" ]
   then
@@ -279,14 +334,25 @@ then
 
   append_arg_to_args "--log-error=$err_log"
 
-  if [ $syslog -eq 1 ]
+  if [ $want_syslog -eq 1 ]
   then
     # User explicitly asked for syslog, so warn that it isn't used
-    log_error "Can't log to error log and syslog at the same time.  Remove all --log-error configuration options for --syslog to take effect.  Logging to '$err_log'."
+    log_error "Can't log to error log and syslog at the same time.  Remove all --log-error configuration options for --syslog to take effect."
   fi
 
-  # Don't use syslog since syslog and error log don't mix well
-  syslog=0
+  # Log to err_log file
+  log_notice "Logging to '$err_log'."
+  logging=file
+else
+  if [ -n "$syslog_tag" ]
+  then
+    # Sanitize the syslog tag
+    syslog_tag=`echo "$syslog_tag" | sed -e 's/[^a-zA-Z0-9_-]/_/g'`
+    syslog_tag_mysqld_safe="${syslog_tag_mysqld_safe}-$syslog_tag"
+    syslog_tag_mysqld="${syslog_tag_mysqld}-$syslog_tag"
+  fi
+  log_notice "Logging to syslog."
+  logging=syslog
 fi
 
 USER_OPTION=""