Add prepare script that does not dump mysql or postgres

ROOT/DEBIAN/control

@@ -3,7 +3,7 @@ Priority: optional
 Section: otherosfs
 Maintainer: Frank Lee <rl201@cam.ac.uk>
 Architecture: all
-Version: 0.9-ch46
+Version: 0.9-ch47
 Depends: zfs-dkms, postgresql, liblockfile-simple-perl, libdbi-perl, libjson-perl, libzfs-perl-chem, libnet-openssh-perl, libdbd-pg-perl, mbuffer, rsync, nfs-kernel-server, pv
 Description: a backup system using ZFS
  Ported (well, mostly) from FreeBSD to a Sane OS.

ROOT/etc/chem-zfs-backup-server/zfs-rsync.d/prepare-ignore-mysql-and-postgres

+#!/bin/bash
+# A script which runs, largely on the remote machine, to prepare for backup
+# Jobs to do: 
+# * Exclude files which are only found in packages
+# * List all packages which are installed
+# * (optionally) dump PostgreSQL into a file
+
+# NB this is intended to be used in conjunction with a separate mysql backup
+# task. To do this:
+# 1) /usr/lib/chem-zfs-backup-server/new-backup-rsync $HOSTNAME mysql
+# 2) add "--exclude=/var/lib/mysql --exclude=/var/lib/mysql-files" to
+#    to zfs-rsync.d config for $HOSTNAME
+
+CONFDIR=/etc/chem-zfs-backup-server/zfs-rsync.d
+SSH="ssh -p ${SSHPORT:-22} -o ConnectTimeout=10"
+SCP="scp -P ${SSHPORT:-22}"
+#echo $SSH
+set -xv
+SERVER=$1
+if [ -z $SERVER ] ; then
+ echo $0 Server
+ exit 1
+fi
+(
+# Has the package status changed since last time we generated the list of files?
+if $SSH root@$SERVER [ /var/lib/dpkg/status -nt /var/adm/backup/package-files ] ; then
+ # Need to rebuild package-files
+ $SSH root@$SERVER "
+  umask 077
+  FILELIST=\`tempfile\`
+  CONFLIST=\`tempfile\`
+  mkdir -p /var/adm/backup
+  # Make logrotate use datestamps
+  if ! grep -q dateext /etc/logrotate.conf ; then sed  -i 's/^include/dateext\ninclude/' /etc/logrotate.conf ; fi
+  # Which packages are installed?
+  dpkg --get-selections | awk ' { print \$1 ; } ' >/var/adm/backup/packages
+  cat /var/lib/dpkg/info/*.list | while read F ; do [ -f \"\$F\" ] && echo \"\$F\" ; done | sort > \$FILELIST
+  awk '/Description:/ { flag = 0 } ; flag == 1 { print \$1 ; }  ; /Conffiles:/ { flag = 1  } ; ' </var/lib/dpkg/status |  sort >\$CONFLIST
+  diff -u \$FILELIST \$CONFLIST | grep ^-/ | sed s/^-// >/var/adm/backup/package-files
+  rm $FILELIST $CONFLIST
+ "
+ mkdir -p $CONFDIR/$SERVER
+ $SCP -q root@$SERVER:/var/adm/backup/package-files $CONFDIR/$SERVER/exclude
+fi
+# Ensure that the excludes file exists, even if we haven't updated it this time
+if [ ! -f $CONFDIR/$SERVER/exclude ] ; then
+  mkdir -p $CONFDIR/$SERVER
+ $SCP -q root@$SERVER:/var/adm/backup/package-files $CONFDIR/$SERVER/exclude
+fi
+
+$SSH root@$SERVER "
+# Ensure that things are not readable where they ought not to be
+umask 077
+
+# Save the package configuration info
+which debconf-get-selections >/dev/null 2>&1 || apt-get install debconf-utils
+which rsync >/dev/null 2>&1 || apt-get install rsync
+debconf-get-selections  >/var/adm/backup/debconf
+
+# Dump LDAP, if we can
+which slapcat >/dev/null 2>&1 && slapcat >/var/adm/backup/ldap
+
+# Ignore exit status of this command
+true
+"
+echo Prepared $SERVER `date`
+) >/var/log/chem-zfs-backup-server/${SERVER}-prepare 2>&1