usr/src/cmd/dumpadm/svc-dumpadm

   1 #!/sbin/sh
   2 #
   3 # CDDL HEADER START
   4 #
   5 # The contents of this file are subject to the terms of the
   6 # Common Development and Distribution License (the "License").
   7 # You may not use this file except in compliance with the License.
   8 #
   9 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10 # or http://www.opensolaris.org/os/licensing.
  11 # See the License for the specific language governing permissions
  12 # and limitations under the License.
  13 #
  14 # When distributing Covered Code, include this CDDL HEADER in each
  15 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16 # If applicable, add the following below this CDDL HEADER, with the
  17 # fields enclosed by brackets "[]" replaced with your own identifying
  18 # information: Portions Copyright [yyyy] [name of copyright owner]
  19 #
  20 # CDDL HEADER END
  21 #
  22 #
  23 # Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  24 #
  25
  26 . /lib/svc/share/smf_include.sh
  27 . /lib/svc/share/fs_include.sh
  28
  29 #
  30 # mksavedir
  31 # Make sure that $DUMPADM_SAVDIR is set and exists.
  32 #
  33 mksavedir ()
  34 {
  35         [ -z "$DUMPADM_SAVDIR" ] && DUMPADM_SAVDIR=/var/crash/`uname -n`
  36         [ -d "$DUMPADM_SAVDIR" ] || /usr/bin/mkdir -m 0700 -p $DUMPADM_SAVDIR
  37 }
  38
  39 #
  40 # We haven't run savecore on a dump device yet
  41 #
  42 savedev=none
  43
  44 #
  45 # If we previously crashed early in boot before dumpadm was used to configure
  46 # an alternate dump device, then the dump is in the primary swap partition,
  47 # which was configured as the dump device by the first swapadd early in boot.
  48 # Thus before we run dumpadm to configure the dump device, we first run
  49 # savecore to check the swap partition for a dump;  this is run in the
  50 # foreground to reduce the chances of overwriting the dump.
  51 #
  52 # This does not apply for zfs root systems that use a zvol for dump;
  53 # for such systems the dedicated dump device is appointed during startup
  54 # of the filesystem/usr:default instance before any swap is added.
  55 # Therefore we must check that the dump device is a swap device here -
  56 # if not then we'll run savecore here in the foreground and prevent
  57 # our dependent services coming online until we're done.
  58 #
  59
  60 rootiszfs=0
  61 alreadydedicated=0
  62
  63 readmnttab / </etc/mnttab
  64 if [ "$fstype" = zfs ] ; then
  65         rootiszfs=1
  66         if [ -x /usr/sbin/dumpadm ]; then
  67                 if /usr/sbin/dumpadm 2>/dev/null | grep "Dump device:" | \
  68                     grep '(dedicated)' > /dev/null 2>&1; then
  69                         alreadydedicated=1
  70                 fi
  71         fi
  72 fi
  73
  74 if [ -x /usr/bin/savecore -a \
  75     \( ! $rootiszfs -eq 1 -o $alreadydedicated -eq 0 \) ]; then
  76         [ -r /etc/dumpadm.conf ] && . /etc/dumpadm.conf
  77
  78         if [ "x$DUMPADM_ENABLE" != xno ] && mksavedir; then
  79                 /usr/bin/savecore $DUMPADM_SAVDIR
  80                 shift $#
  81                 set -- `/usr/sbin/dumpadm 2>/dev/null | /usr/bin/grep 'device:'`
  82                 savedev=${3:-none}
  83         else
  84                 #
  85                 # dumpadm -n is in effect, but we can still run savecore
  86                 # to raise an event with initial panic detail extracted
  87                 # from the dump header.
  88                 #
  89                 /usr/bin/savecore -c
  90         fi
  91 fi
  92
  93 if [ ! -x /usr/bin/savecore ]; then
  94         echo "WARNING: /usr/bin/savecore is missing or not executable" >& 2
  95 fi
  96
  97 #
  98 # Now run dumpadm to configure the dump device based on the settings
  99 # previously saved by dumpadm.  See dumpadm(1m) for instructions on
 100 # how to modify the dump settings.
 101 #
 102 if [ -x /usr/sbin/dumpadm ]; then
 103         /usr/sbin/dumpadm -u || $SMF_EXIT_ERR_CONFIG
 104 else
 105         echo "WARNING: /usr/sbin/dumpadm is missing or not executable" >& 2
 106         exit $SMF_EXIT_ERR_CONFIG
 107 fi
 108
 109 if [ -r /etc/dumpadm.conf ]; then
 110         . /etc/dumpadm.conf
 111 else
 112         echo "WARNING: /etc/dumpadm.conf is missing or unreadable" >& 2
 113         exit $SMF_EXIT_ERR_CONFIG
 114 fi
 115
 116 #
 117 # If the savecore executable is absent then we're done
 118 #
 119 if [ ! -x /usr/bin/savecore ]; then
 120         exit $SMF_EXIT_ERR_CONFIG
 121 fi
 122
 123 #
 124 # Now that dumpadm has reconfigured /dev/dump, we need to run savecore again
 125 # because the dump device may have changed.  If the earlier savecore had
 126 # saved the dump, savecore will just exit immediately.
 127 #
 128
 129 isswap=0
 130 swapchanged=0
 131 if /usr/sbin/swap -l 2>/dev/null | grep "^${DUMPADM_DEVICE} " \
 132             >/dev/null 2>&1; then
 133         isswap=1
 134         if [ "x$savedev" != "x$DUMPADM_DEVICE" ]; then
 135                 swapchanged=1
 136         fi
 137 fi
 138
 139 if [ "x$DUMPADM_ENABLE" != xno ]; then
 140         if [ $isswap -eq 1 ]; then
 141                 #
 142                 # If the dump device is part of swap, we only need to run
 143                 # savecore a second time if the device is different from the
 144                 # swap device on which we initially ran savecore.
 145                 #
 146                 if [ $swapchanged -eq 1 ]; then
 147                     mksavedir && /usr/bin/savecore $DUMPADM_SAVDIR &
 148                 fi
 149         else
 150                 #
 151                 # The dump device couldn't have been dedicated before we
 152                 # ran dumpadm, so we must execute savecore again.
 153                 #
 154                 mksavedir && /usr/bin/savecore $DUMPADM_SAVDIR &
 155         fi
 156 else
 157                 #
 158                 # savecore not enabled.  Check whether a valid dump is
 159                 # present on the device and raise an event to signal that,
 160                 # but avoid sending a duplicate event from the savecore -c
 161                 # earlier.
 162                 #
 163                 if [ $isswap -eq 0 -o $swapchanged -eq 1 ]; then
 164                         /usr/bin/savecore -c
 165                 fi
 166 fi
 167
 168 exit $SMF_EXIT_OK