X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=backup.sh;h=cf2e24b31205389185aaf20edc6d11a15d29abd0;hb=80b6956d5393876a935dafcd3bbcac655f63d0d3;hp=9a6ef6a36f658c217dad9279f7ead02607e5c34c;hpb=6f8eb0d7facd6667490dcae8c726831c6c2b2b89;p=backup.sh

diff --git a/backup.sh b/backup.sh
index 9a6ef6a..cf2e24b 100755
--- a/backup.sh
+++ b/backup.sh
@@ -1,37 +1,72 @@
-#!/bin/bash
+#!/bin/sh
 
-PATH=/local/bin:$PATH
-export PATH
-confdir=/home/backup/conf/
+# Locking
+LOCKFILE=/home/backup/backuprun.lockfile
+
+# Initially, we consider everything to be just fine.
+R=0
+
+# Die gracefully (ie. remove lockfile)
+die() {
+	echo `date`": Something nasty happened, and since I fork a lot:"
+        echo `date`": I CANNOT CLEAN UP THE MESS MYSELF."
+	echo `date`": You need to get rid of lost process named stuff like $0, tar and ssh."
+	exit 255
+}
+
+# Trap C-c and kill
+trap die SIGINT SIGTERM
+
+# Don't start if we're already running
+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" > $exclude
+###
+
+#syntax of remotestat:
+#hostname:/directory/
+remotestatf=$confdir/remotestat
+[ -f $remotestatf ] && remotestat=`cat $remotestatf`
+###
 
-echo -n "Starter... "
-date
+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:"
-cat $exclude
-echo
-echo
+#start the logfile
+echo `date`": Backup run starting" >&2
 
-#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 $confdir/computers.unix \
+  | grep -v "^#" \
+  | grep -v "^$" `
+
+# Backup only one computer, from command line?
+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 +75,66 @@ DATEs=`date "+%Y-%m-%d %H:%M"`       #passer for bruk med tar
 backup()
 {
 
- echo "$computer:$filesystem tar $backuplevel backup"
+ echo -n `date` >&2
+ printf " $computer: %-${logw}s %s\n" "$computer:$filesystem" "$backuplevel backup" >&2
 
- if [ "$backuplevel" = "daglig" ]
+ if [ "$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 root@$computer "ls ~/.backup/exclude"`
+
+ #We try to run tar on the remote computer
+ #    z gzip it
+ #    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 root@$computer \"$tar --one-file-system -zcf - -C $filesystem . $lastcmd \
+	--exclude-from=$exf\" > $TARFILE"
+ echo `date`" $computer: Running $TARCMD" >&2
+ eval $TARCMD;
+ if [ -s $TARFILE ]; then
+  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`" $computer: $TARFILE empty. $backuplevel backup of $computer:$filesystem failed and deleted"
+
+  # We don't want to return 0
+  R=1
  fi
 
 }
@@ -82,103 +142,147 @@ backup()
 #Løper gjennom listen av unixmaskiner som vi skal ta backup av
 for computer in $unixcomputers
 do
+( 
+ echo `date`" $computer: Backing up $computer" >&2
+
+ # Try to SSH to the computer without entering a password.
+ if ! `ssh -n -o NumberOfPasswordPrompts=0 root@$computer /bin/true`; then
+  echo `date`" $computer: Could not use passwordless SSH."
+
+  # We don't want to return 0
+  R=1
+  # Do next computer
+  continue;
+ fi
  
  #tømmer variabelen for sikkerhets skyld
  filesystems=""
 
  #Sjekker nest siste felt i fstab. Om det er 0 tar vi ikke backup
- filesystems=`ssh -n $computer "cat /etc/fstab" \
+ filesystems=`ssh -n root@$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 $computer "rm -rf /tmp/.backup ; mkdir -m 700 /tmp/.backup"
+ #clean up our dir at this client
+ if ! ssh root@$computer "rm -r ~/.backup ; mkdir -m 700 ~/.backup"; then
+  echo `date`" $computer: Could not create backup staging area at $computer:~/.backup - skipping backup of $computer"
+  # We don't want to return 0
+  R=1
+  continue;
+ fi
 
- #Prøver å kopiere over $exclude til $computer
- scp $exclude $computer:/tmp/.backup/exclude ||
-    echo "Vi klarte ikke kopiere over exclude.txt til $computer :("
+ #try to copy $exclude to $computer
+ if ! scp $exclude root@$computer:~/.backup/exclude > /dev/null; then
+  echo `date`" $computer: Could not copy exclude.txt to $computer - skipping backup of $computer"
+  # We don't want to return 0
+  R=1
+  continue;
+ 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
+# TODO: Gah, clean this mess!
+ [ -f $confdir/preexec.$computer ] && (
+    scp $confdir/preexec.$computer  root@$computer:~/.backup/preexec >&2 ||
+     ( echo `date`" $computer: Could not copy preexec.$computer to $computer:~/.backup/preexec - skipping backup of $computer"
+       R=1
+       continue
+     )
+    )
+ [ -f $confdir/postexec.$computer ] && (
+    scp $confdir/postexec.$computer root@$computer:~/.backup/postexec >&2 ||
+     ( echo `date`" $computer: Could not copy postexec.$computer to $computer:~/.backup/postexec - skipping backup of $computer"
+       R=1
+       continue
+     )
+    )
+
+ #try to run preexec if it exist
+ if ! ssh root@$computer "[ ! -f ~/.backup/preexec ] || /bin/bash -x ~/.backup/preexec" >&2; then
+ 	echo `date`" $computer: Could not run $computer:~/.backup/preexec - skipping backup of $computer"
+	R=1
+	continue
+ fi
 
- #Prøver å kjøre preexec om den finnes
- ssh $computer "[ -f /tmp/.backup/preexec ] && 
-                   /bin/bash -x /tmp/.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 $full|cut -d . -f 1`
-   echo "$computer:$filesystem sletter full $prefix (for mange)"
+   prefix=`echo $full | sed "s/\.[^.]*$//"`
+   echo `date`": $computer:$filesystem sletter full $prefix (for mange)" >&2
    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 {} \;
-
  done
 
- #Prøver å kjøre postexec om den finnes
- ssh $computer "[ -f /tmp/.backup/postexec ] &&
-                   /bin/bash -x /tmp/.backup/postexec"
+ #try to run postexec if it exist
+ if ! ssh root@$computer "[ ! -f ~/.backup/postexec ] || /bin/bash -x ~/.backup/postexec" >&2; then
+ 	echo `date`" $computer: Could not run $computer:~/.backup/postexec"
+	R=1
+ fi
 
-done
+)  
+done &
 
-#Finne de backupene som har tryna og 
-#lage en webside med de
-/home/backup/finn_ufullstendige.sh
+wait
 
-#Lage søkbar indeks over listefilene
-/home/backup/indekser.sh
+# Remove lockfile
+rm $LOCKFILE
 
-echo -n "Ferdig... "
-date
+# Did anything go wrong?
+# (IMPORTANT NOTE: The R-business does not work as expected, since this script
+# forks itself.
+if [ $R != 0 ]; then
+	echo `date`": Backup run ended with errors, check logs."
+	exit 1
+else
+	echo `date`": Backup run ended" >&2
+fi