X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=backup.sh;h=fce079c8aef076012608b5643c0a65d6e59ea42f;hb=35ee17f5f1344cab950789aca51415dc4b8093c3;hp=19a49244b9beab3a2048fac40ae0a72866a637a0;hpb=af7c867e58a6938de5e9fbec7a7a1c0bacd3256c;p=backup.sh

diff --git a/backup.sh b/backup.sh
index 19a4924..fce079c 100755
--- a/backup.sh
+++ b/backup.sh
@@ -1,4 +1,28 @@
-#!/bin/bash
+#!/bin/sh
+
+# 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
@@ -20,21 +44,22 @@ PATH=/local/bin:$PATH:/store/bin
 export PATH
 
 #start the logfile
-date
-echo
-echo "Exclude pattern:"
-cat $exclude
-echo
-echo
+echo `date`": Backup run starting" >&2
 
 umask 027
 
 # The computers we want to back up
-unixcomputers=`cat $confdir/computers.unix`
-###
+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?
-maksantallfulle=2          #hvor mange fulle 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
 ###
@@ -50,26 +75,46 @@ DATEs=`date "+%Y-%m-%d %H:%M"`       #format: tar
 backup()
 {
 
- printf "%-${logw}s %s\n" "$computer:$filesystem" "$backuplevel backup"
+ echo -n `date` >&2
+ printf " $computer: %-${logw}s %s\n" "$computer:$filesystem" "$backuplevel backup" >&2
 
  if [ "$backuplevel" = "daglig" ] || [ "$backuplevel" = "incremental" ]
  then
-  forrige=`cat ../.date`
-  forrigecmd="--newer=\"$forrige\""
+  lastd=`cat ../.date`
+  lastcmd="--newer='$lastd'"
  else
-  forrigecmd=""
+  lastcmd=""
+ fi
+
+ #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
- if `ssh $computer ". /tmp/.backup/env ;\
-     cd $filesystem ;\
-     tar cfl - . $forrigecmd \
-      --exclude-from=/tmp/.backup/exclude \
-        | gzip" \
-   |  dd of=$DATE.tmp 2>/dev/null` 
- then
-  #perhaps it did work
-  mv $DATE.tmp $DATE.tgz
+ #    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
+
+ if eval $TARCMD; then
+  mv $TARFILE $DATE.tgz
   #make a filelist.
   #update the datefile if the filelist is ok.
   tar tvfz $DATE.tgz > $DATE.idx 2>&1 &&
@@ -85,8 +130,11 @@ backup()
 
  else
   #it did not work
-  rm $DATE.tmp 2>/dev/null
-  echo "$backuplevel backup of $computer:$filesystem failed and deleted"
+  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
 
 }
@@ -94,38 +142,63 @@ 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
+  break;
+ fi
  
  #tømmer variabelen for sikkerhets skyld
  filesystems=""
 
  #Sjekker nest siste felt i fstab. Om det er 0 tar vi ikke backup
- filesystems=`ssh -n $computer ". /tmp/.backup/env ; cat /etc/fstab" \
+ filesystems=`ssh -n root@$computer "cat /etc/fstab" \
   | grep -v nfs \
-  | grep -v ^# \
+  | grep -v "^#" \
+  | grep -v "^$" \
   | awk '{ if ( $(NF-1) != "0" ) print $2}' `
 
  #clean up our dir at this client
- ssh $computer "rm -rf /tmp/.backup ; mkdir -m 700 /tmp/.backup"
+ if ! ssh root@$computer "rm -r ~/.backup ; mkdir -m 700 ~/.backup"; then
+  echo `date`" $computer: Could not create backup staging area at $computer:~/.backup"
+  # We don't want to return 0
+  R=1
+  break;
+ fi
 
  #try to copy $exclude to $computer
- scp $exclude $computer:/tmp/.backup/exclude ||
-    echo "could not copy exclude.txt to $computer :("
-
- #create env if it does not exist
- if [ ! -f $confdir/env.$computer ]
-    touch  $confdir/env.$computer
-
- #copy env to client
- scp $confdir/env.$computer  $computer:/tmp/.backup/env
+ if ! scp $exclude root@$computer:~/.backup/exclude > /dev/null; then
+  echo `date`" $computer: Could not copy exclude.txt to $computer"
+  # We don't want to return 0
+  R=1
+  break;
+ fi
 
  #try to copy preeexec and postexec if they exist
- [ -f $confdir/preexec.$computer ] &&
-    scp $confdir/preexec.$computer  $computer:/tmp/.backup/preexec
- [ -f $confdir/postexec.$computer ] &&
-    scp $confdir/postexec.$computer $computer:/tmp/.backup/postexec
+# TODO: Gah, clean this mess!
+ [ -f $confdir/preexec.$computer ] && (
+    scp $confdir/preexec.$computer  root@$computer:~/.backup/preexec ||
+     ( echo `date`" $computer: Could not copy preexec.$computer to $computer:~/.backup/preexec";
+       R=1
+       break
+     )
+    )
+ [ -f $confdir/postexec.$computer ] && (
+    scp $confdir/postexec.$computer root@$computer:~/.backup/postexec ||
+     ( echo `date`" $computer: Could not copy postexec.$computer to $computer:~/.backup/postexec"
+       break
+       R=1
+     )
+    )
 
  #try to run preexec if it exist
- ssh $computer ". /tmp/.backup/env ; [ -f /tmp/.backup/preexec ] && /bin/bash -x /tmp/.backup/preexec"
+ ssh root@$computer "[ -f ~/.backup/preexec ] && /bin/bash -x ~/.backup/preexec"
 
  for filesystem in $filesystems
  do
@@ -135,7 +208,6 @@ do
   #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
 
@@ -150,24 +222,29 @@ do
   fi
 
   #sjekker om det er på tide med en full
-  if 
- [ -z `find $storagedir/$computer/$sfilesystem/full/ -name \*tgz -mtime -$dagermellomfulle` ]
-  then
+  if [ -z "`find $storagedir/$computer/$sfilesystem/full/ -name \*tgz -mtime -$dagermellomfulle`" ]; then
    backuplevel=full
   fi
  
-  #gå ned i rett katalog
-  cd $storagedir/$computer/$sfilesystem/$backuplevel
+  #gå ned i rett katalog, eller dø 
+  # TODO bør sende mail om dette skjer!
+  cd $storagedir/$computer/$sfilesystem/$backuplevel || die
 
   #perform the actual backup
   backup
 
+  # 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
-  mf=$(($maksantallfulle+1))
   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
 
@@ -178,19 +255,23 @@ do
      -type f \
      \! -newer $oldf \
      -exec rm {} \;
-     #denne funker bare med gnu find
-     #-printf "$computer:$filesystem sletter daglig %f (for gammel)\n" \
-
  done
 
  #try to run postexec if it exist
- ssh $computer ". /tmp/.backup/env ; [ -f /tmp/.backup/postexec ] && /bin/bash -x /tmp/.backup/postexec"
+ ssh root@$computer "[ -f ~/.backup/postexec ] && /bin/bash -x ~/.backup/postexec"
 
-done
+)  
+done &
 
-#create report
-/home/backup/report.sh $storagedir > /tmp/report.txt
-[ ! -z $remotestat ] && scp /tmp/report.txt $remotestat
-###
+wait
+
+# Remove lockfile
+rm $LOCKFILE
 
-date
+# Did anything go wrong?
+if [ $R != 0 ]; then
+	echo `date`": Backup run ended with errors, check logs."
+	exit 1
+else
+	echo `date`": Backup run ended" >&2
+fi