X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=backup.sh;h=0a4cb4ac2a61e7869b115fe1777974f3bd40f201;hb=c027e80dd5f2ac433fefeb76dabc4a3f7aed988b;hp=c5c9ef476dd33184974f341b230f74dabd7b428f;hpb=37553240139bd379052d8fd191f527145d360d65;p=backup.sh

diff --git a/backup.sh b/backup.sh
index c5c9ef4..0a4cb4a 100755
--- a/backup.sh
+++ b/backup.sh
@@ -1,37 +1,69 @@
-#!/bin/bash
+#!/bin/sh
 
-PATH=/local/bin:$PATH
-export PATH
-confdir=/home/backup/conf/
+# Locking
+LOCKFILE=/home/backup/backuprun.lockfile
+
+# Die gracefully (ie. remove lockfile)
+die() {
+	rm $LOCKFILE
+	exit 255
+}
+
+trap die SIGINT SIGTERM
+
+if [ -e $LOCKFILE ]; then
+	echo `date`": $LOCKFILE exists, exiting."
+	exit 1
+fi;
+touch $LOCKFILE
+
+#dirs
+confdir=/home/backup/conf/           #configuration files
+storagedir=/backup                   #mountpoint of huge disc
+###
+
+#exclude-pattern
 exclude=$confdir/exclude
+[ ! -f $exclude ] && printf "tmp\ncore\n" > $exclude
+###
 
-echo -n "Starter... "
-date
+#syntax of remotestat:
+#hostname:/directory/
+remotestatf=$confdir/remotestat
+[ -f $remotestatf ] && remotestat=`cat $remotestatf`
+###
+
+PATH=/local/bin:$PATH:/store/bin
+export PATH
 
-#Skriver litt til loggefilen
-echo
-echo "Slik ser regexpen som forteller hva vi ikke skal ta backup av:"
+#start the logfile
+echo `date`": Backup run starting"
+echo "Exclude pattern:"
 cat $exclude
-echo
-echo
+echo "End exclude pattern"
 
-#newgrp itk
 umask 027
 
-#Maskiner vi skal ta backup av
-unixcomputers=`cat $confdir/computers.unix`
-ntcomputers=`cat $confdir/computers.nt`
+# The computers we want to back up
+unixcomputers=`cat $confdir/computers.unix \
+  | grep -v "^#" \
+  | grep -v "^$" `
+
+
+if [ $1 ] ; then 
+  unixcomputers=$1
+fi;
+###
 
 #disse bør kunne varieres fra fs til fs?
-#disse bør flyttes ut i egen fil som kan editeres fra web kanskje?
-maksantallfulle=2          #hvor mange fulle vi tar vare på
-#maksantalldaglige=30       #hvor mange daglige vi tar vare på
+maksantallfulle=3          #hvor mange fulle vi tar vare på
 dagermellomfulle=30        #antall dager før det er på tide med ny full
+logw=40
 ###
 
 #lager datovariabeler
-DATE=`date "+%Y%m%d%H%M"`            #passer for bruk med touch
-DATEs=`date "+%Y-%m-%d %H:%M"`       #passer for bruk med tar
+DATE=`date "+%Y%m%d%H%M"`            #format: touch
+DATEs=`date "+%Y-%m-%d %H:%M"`       #format: tar
 ###
 
 #selve backupen
@@ -40,41 +72,68 @@ DATEs=`date "+%Y-%m-%d %H:%M"`       #passer for bruk med tar
 backup()
 {
 
- printf "%-50s %s\n" "$computer:$filesystem" "$backuplevel backup"
+ printf "%-${logw}s %s\n" "$computer:$filesystem" "$backuplevel backup"
 
  if [ "$backuplevel" = "daglig" ] || [ "$backuplevel" = "incremental" ]
  then
-  forrige=`cat ../.dato`
-  forrigecmd=--newer=\"$forrige\"
+  lastd=`cat ../.date`
+  lastcmd="--newer='$lastd'"
  else
-  forrigecmd=""
+  lastcmd=""
  fi
 
- #Prøver å ta backup med tar
- if `ssh $computer "cd $filesystem ;\
-     tar cfl - . $forrigecmd \
-      --exclude-from=/tmp/.backup/exclude \
-        | gzip" \
-   |  dd of=$DATE.tmp 2>/dev/null` 
- then
-  #Det gikk kanskje bra
-  mv $DATE.tmp $DATE.tgz
-  #lage listefil og oppdater datofil om det gikk greit
+ #if this client has a special tar
+ #we need to find a better solution to this conf-issue
+ if [ -f $confdir/tar.$computer ] ; then
+   tar=`cat $confdir/tar.$computer`
+ else 
+   tar=tar
+ fi
+
+ #expand the exclude-path for use with tar
+ exf=`ssh $computer "ls ~/.backup/exclude"`
+
+ #We try to run tar on the remote computer
+ #    c create archive
+ #    C change to directory first
+ #    - output to stdout (we pipe to gzip, then to dd)
+ #    . where to start taring (see C)
+ #    $lastcmd only files newer than this
+ #    --exclude-from file to get exclusion pattern from
+ #    pipe to gzip, which in turn pipes over the ssh-stream
+ #    ..to dd, to output to a file. We surpress messages from dd.
+ #    And at last, redirect stderr to stdout, to get output logged.
+ TARFILE=$DATE.tmp
+ TARCMD="ssh $computer \"$tar --one-file-system -cf - -C $filesystem . $lastcmd \
+	--exclude-from=$exf | gzip\" | (dd of=$TARFILE 2> /dev/null) 2>&1"
+ echo "cmdline: $TARCMD"
+ eval $TARCMD
+
+ # Ideally, we should check wether the tar command returned 0 or not, but it
+ # seems a pipe in bash returns the value of the last command in the pipe.
+ # Instead, we check wether the resulting file has zero size, in which case we
+ # consider it an error.
+ if [ -s $TARFILE ]; then
+  echo `date`": command probably ran without errors."
+  #perhaps it did work
+  mv $TARFILE $DATE.tgz
+  #make a filelist.
+  #update the datefile if the filelist is ok.
   tar tvfz $DATE.tgz > $DATE.idx 2>&1 &&
-    echo $DATEs > ../.dato            &&
-    touch -t $DATE ../.dato
+    echo $DATEs > ../.date            &&
+    touch -t $DATE ../.date
 
-  #lage sortert listefil
+  #make a sortet filelist
   grep -v ^d $DATE.idx | sort -n -r +2 > $DATE.sdx
 
-  #fikse rettigheter
-  chmod 600 *tgz
-  chmod 644 *sdx *idx
+  #fix perm
+  chmod 600 *tgz                      #only for us
+  chmod 644 *sdx *idx 2>/dev/null     #everyone can read
 
  else
-  #Det gikk ikke bra
-  rm $DATE.tmp
-  echo "$backuplevel backup av $computer:$filesystem gikk ikke bra"
+  #it did not work
+  rm $TARFILE
+  echo `date`": $TARFILE empty. $backuplevel backup of $computer:$filesystem failed and deleted"
  fi
 
 }
@@ -82,6 +141,16 @@ backup()
 #Løper gjennom listen av unixmaskiner som vi skal ta backup av
 for computer in $unixcomputers
 do
+( 
+ echo `date`": Backing up $computer"
+
+ # Try to SSH to the computer without entering a password.
+ if `ssh -n -o NumberOfPasswordPrompts=0 $computer /bin/true`; then
+  echo "Passwordless SSH to $computer works."
+ else
+  echo "Could not use passwordless SSH to $computer."
+  break;
+ fi
  
  #tømmer variabelen for sikkerhets skyld
  filesystems=""
@@ -89,96 +158,107 @@ do
  #Sjekker nest siste felt i fstab. Om det er 0 tar vi ikke backup
  filesystems=`ssh -n $computer "cat /etc/fstab" \
   | grep -v nfs \
-  | grep -v ^# \
+  | grep -v "^#" \
+  | grep -v "^$" \
   | awk '{ if ( $(NF-1) != "0" ) print $2}' `
 
- #Renske opp i katalogen vår på klienten
- ssh $computer "rm -rf /tmp/.backup ; mkdir -m 700 /tmp/.backup"
+ echo "Filesystems to backup on $computer: $filesystems"
 
- #Prøver å kopiere over $exclude til $computer
- scp $exclude $computer:/tmp/.backup/exclude ||
-    echo "Vi klarte ikke kopiere over exclude.txt til $computer :("
+ #clean up our dir at this client
+ if ! ssh $computer "rm -r ~/.backup ; mkdir -m 700 ~/.backup"; then
+  echo "Could not create backup staging area at $computer:~/.backup"
+  break;
+ fi
+
+ #try to copy $exclude to $computer
+ if ! scp $exclude $computer:~/.backup/exclude > /dev/null; then
+  echo "Could not copy exclude.txt to $computer"
+  break;
+ fi
 
- #Prøver å kopiere over preeexec og postexec om de finnes
- [ -f $confdir/preexec.$computer ] &&
-    scp $confdir/preexec.$computer  $computer:/tmp/.backup/preexec
- [ -f $confdir/postexec.$computer ] &&
-    scp $confdir/postexec.$computer $computer:/tmp/.backup/postexec
+ #try to copy preeexec and postexec if they exist
+ [ -f $confdir/preexec.$computer ] && (
+    scp $confdir/preexec.$computer  $computer:~/.backup/preexec ||
+     ( echo "Could not copy preexec.$computer to $computer:~/.backup/preexec"; break )
+    )
+ [ -f $confdir/postexec.$computer ] && (
+    scp $confdir/postexec.$computer $computer:~/.backup/postexec ||
+     ( echo "Could not copy postexec.$computer to $computer:~/.backup/postexec"; break )
+    )
 
- #Prøver å kjøre preexec om den finnes
- ssh $computer "[ -f /tmp/.backup/preexec ] && 
-                   /bin/bash -x /tmp/.backup/preexec"
+ #try to run preexec if it exist
+ ssh $computer "[ -f ~/.backup/preexec ] && /bin/bash -x ~/.backup/preexec"
 
  for filesystem in $filesystems
  do
   #lager en variant uten tegnet "/" eller $ (gjelder NT)
   sfilesystem=`echo $filesystem | tr '\/\$' '__'`
 
-  #
-  echo $filesystem > /backup/$computer/$sfilesystem.navn
-  chmod 644 /backup/$computer/$sfilesystem.navn
+  #lager det som trengs av kataloger
+  mkdir -m 755 -p $storagedir/$computer/$sfilesystem/{full,daglig} 2>/dev/null
+
+  echo $filesystem > ${storagedir}/${computer}/.${sfilesystem}.name 
+  chmod 644 ${storagedir}/${computer}/.${sfilesystem}.name
 
-  #standard backuplevel. full og daglig er eneste muligheter
+  #set default backuplevel
   backuplevel=daglig
-  #backuplevel=full
-
-  #lager det som trengs av kataloger
-  mkdir -m 755 -p /backup/$computer/$sfilesystem/{full,daglig} 2>/dev/null
 
-  #Bør bare skje ved første gangs kjøring for dette fs
-  if [ ! -f /backup/$computer/$sfilesystem/.dato ]
+  if [ ! -f $storagedir/$computer/$sfilesystem/.date ]
   then
+   #take the first full backup of this filesystem on this computer
    backuplevel=full
-   echo $DATEs > /backup/$computer/$sfilesystem/.dato
-   echo "$computer:$filesystem datofil laget"
-   echo "$computer:$filesystem trenger full pga ingen fra foer"
+   echo $DATEs > $storagedir/$computer/$sfilesystem/.date
   fi
 
   #sjekker om det er på tide med en full
-  if 
- [ -z `find /backup/$computer/$sfilesystem/full/ -name \*tgz -mtime -$dagermellomfulle` ]
-  then
-   echo "$computer:$filesystem trenger full pga lenge siden sist"
+  if [ -z "`find $storagedir/$computer/$sfilesystem/full/ -name \*tgz -mtime -$dagermellomfulle`" ]; then
    backuplevel=full
   fi
  
-  #gå ned i rett katalog
-  cd /backup/$computer/$sfilesystem/$backuplevel
+  #gå ned i rett katalog, eller dø 
+  # TODO bør sende mail om dette skjer!
+  cd $storagedir/$computer/$sfilesystem/$backuplevel || die
 
-  #selve backupen
+  #perform the actual backup
   backup
 
-  #Sjekker om det er på tide å slette noen fulle backuper
-  mf=$(($maksantallfulle+1))
-  for full in `ls -1t /backup/$computer/$sfilesystem/full/*tgz | tail +$mf`
+  # Sjekk om det skal være et annet antall fulle backuper av en boks
+  if [ -f $confdir/maksfulle.$computer ] ; then
+    mf=$((`cat $confdir/maksfulle.$computer`+1))
+  else
+    mf=$(($maksantallfulle+1))
+  fi
+
+  #delete complete backups
+  for full in `ls -1t $storagedir/$computer/$sfilesystem/full/*tgz | tail +$mf`
   do
-   prefix=`echo $full|cut -d . -f 1`
+   prefix=`echo $full | sed "s/\.[^.]*$//"`
    echo "$computer:$filesystem sletter full $prefix (for mange)"
    rm $prefix*
   done
 
-  #Sjekker om det er på tide å slette noen daglige backuper
-  eldste=`ls -t1 /backup/$computer/$sfilesystem/full/*tgz | tail -1`
+  #delete incremental backups older than the oldest complete backup
+  oldf=`ls -t1 $storagedir/$computer/$sfilesystem/full/*tgz | tail -1`
   find \
-     /backup/$computer/$sfilesystem/daglig \
-     \! -newer $eldste \
-     -printf "$computer:$filesystem sletter daglig %f (for gammel)\n" \
+     $storagedir/$computer/$sfilesystem/daglig \
+     -type f \
+     \! -newer $oldf \
      -exec rm {} \;
-
+#     #denne funker bare med gnu find
+#     #-printf "$computer:$filesystem sletter daglig %f (for gammel)\n"
  done
 
- #Prøver å kjøre postexec om den finnes
- ssh $computer "[ -f /tmp/.backup/postexec ] &&
-                   /bin/bash -x /tmp/.backup/postexec"
+ #try to run postexec if it exist
+ ssh $computer "[ -f ~/.backup/postexec ] && /bin/bash -x ~/.backup/postexec"
+
+)  
+done &
 
-done
+wait
 
-#Finne de backupene som har tryna og 
-#lage en webside med de
-/home/backup/finn_ufullstendige.sh
+# print diskusage to logfile
+echo "Current disk usage:"
+df -k $storagedir
 
-#Lage søkbar indeks over listefilene
-/home/backup/indekser.sh
+echo `date`": Backup run ended"
 
-echo -n "Ferdig... "
-date