get path to used tools with help of "which" and check for installed tools

1 files changed, 78 insertions, 35 deletions

diff --git a/backup.sh b/backup.sh
index ed381cf..733b889 100755
--- a/backup.sh
+++ b/backup.sh
@@ -1,15 +1,58 @@
 #!/bin/bash
 #set -x
 
+# get path to all needed tools
+# /bin
+cp=$(which cp)
+date=$(which date)
+echo=$(which echo)
+grep=$(which grep)
+mktemp=$(which mktemp)
+mv=$(which mv)
+pwd=$(which pwd)
+rm=$(which rm)
+sed=$(which sed)
+tar=$(which tar)
+umount=$(which umount)
+# /usr/bin
+cut=$(which cut)
+dirname=$(which dirname)
+expr=$(which expr)
+head=$(which head)
+nice=$(which nice)
+rsync=$(which rsync)
+seq=$(which seq)
+ssh=$(which ssh)
+sshfs=$(which sshfs)
+tail=$(which tail)
+
+# check if all needed tools are installed (only the ones not installed under /bin/)
+alltoolsinstalled="yes"
+test "$cut" = "" && echo "'cut' not installed or not found by 'which'" && alltoolsinstalled="no"
+test "$dirname" = "" && echo "'dirname' not installed or not found by 'which'" && alltoolsinstalled="no"
+test "$expr" = "" && echo "'expr' not installed or not found by 'which'" && alltoolsinstalled="no"
+test "$head" = "" && echo "'head' not installed or not found by 'which'" && alltoolsinstalled="no"
+test "$nice" = "" && echo "'nice' not installed or not found by 'which'" && alltoolsinstalled="no"
+test "$rsync" = "" && echo "'rsync' not installed or not found by 'which'" && alltoolsinstalled="no"
+test "$seq" = "" && echo "'sed' not installed or not found by 'which'" && alltoolsinstalled="no"
+test "$ssh" = "" && echo "'ssh' not installed or not found by 'which'" && alltoolsinstalled="no"
+test "$sshfs" = "" && echo "'sshfs' not installed or not found by 'which'" && alltoolsinstalled="no"
+test "$tail" = "" && echo "'tail' not installed or not found by 'which'" && alltoolsinstalled="no"
+
+if [ "$alltoolsinstalled" = "no" ]
+then
+   exit 1
+fi
+
 # main configuration
-script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+script_dir="$( cd "$( $dirname "${BASH_SOURCE[0]}" )" && $pwd )"
 config_file="$script_dir/main.cfg"
 # timestamps yyyy-mm-dd and unixtime for calculating
-backup_stamp=$(date +%F)
-backup_time=$(date -d$backup_stamp +%s)
+backup_stamp=$($date +%F)
+backup_time=$($date -d$backup_stamp +%s)
 # check if it is the first of the month to do monthly backups
 backup_month="no"
-if [ "$(echo $backup_stamp | cut -d- -f3)" = "01" ]
+if [ "$($echo $backup_stamp | $cut -d- -f3)" = "01" ]
 then
    backup_month="yes"
 fi
@@ -21,14 +64,14 @@ function source_section {
    section_start="^\[$section_name\]$"
    section_end="^\[/$section_name\]$"
 
-   line_start=$(grep -n "$section_start" "$config_name" | cut -d: -f1)
-   line_end=$(expr $(grep -n "$section_end" "$config_name" | cut -d: -f1) - 1)
-   line_diff=$(expr $line_end - $line_start)
+   line_start=$($grep -n "$section_start" "$config_name" | $cut -d: -f1)
+   line_end=$($expr $($grep -n "$section_end" "$config_name" | $cut -d: -f1) - 1)
+   line_diff=$($expr $line_end - $line_start)
 
-   tmp_file=$(mktemp)
-   head -n $line_end "$config_name" | tail -n $line_diff > "$tmp_file"
+   tmp_file=$($mktemp)
+   $head -n $line_end "$config_name" | $tail -n $line_diff > "$tmp_file"
    source "$tmp_file"
-   rm -f "$tmp_file"
+   $rm -f "$tmp_file"
 }
 
 # copy file with rsync to server and save last timestamp to logfile
@@ -38,19 +81,19 @@ function rsync_server {
    logfileentry="$3"
    #nice -n 19 rsync -rle "ssh -i $keyfile" "$filefrom" "$userserver:$dirto"
    # limit the bandwith
-   nice -n 19 rsync --bwlimit=100000 -rle "ssh -i $keyfile" "$filefrom" "$userserver:$dirto"
+   $nice -n 19 $rsync --bwlimit=100000 -rle "$ssh -i $keyfile" "$filefrom" "$userserver:$dirto"
    ret=$?
    if [ $ret -ne 0 ]
    then
-      echo "problem in rsync: $filefrom"
+      $echo "problem in rsync: $filefrom"
    fi
-   echo "$filefrom" | grep ".month." > /dev/null 2>&1
+   $echo "$filefrom" | $grep ".month." > /dev/null 2>&1
    ret2=$?
    # on monthly backups and connection errors there should be no update of logfile
    if [ $ret2 -ne 0 -a $ret -eq 0 ]
    then
-      sed -e "s/^$logfileentry .*$/${logfileentry} $backup_time/" "$logfile" > "$logfile.tmp"
-      mv -f "$logfile.tmp" "$logfile"
+      $sed -e "s/^$logfileentry .*$/${logfileentry} $backup_time/" "$logfile" > "$logfile.tmp"
+      $mv -f "$logfile.tmp" "$logfile"
    fi
 }
 
@@ -77,19 +120,19 @@ do
             # section for specified folder
             source_section "$config_act" "$dir_single"
             # rotate is done through days, so we have to know the interval in sections
-            rotate_stamp=$(expr $time \* 24 \* 60 \* 60)
+            rotate_stamp=$($expr $time \* 24 \* 60 \* 60)
             # for new configurations that does not have a last timestamp we create a zero one
-            grep "^${config_single}_$dir_single " $logfile > /dev/null 2>&1
+            $grep "^${config_single}_$dir_single " $logfile > /dev/null 2>&1
             if [ $? -ne 0 ]
             then
-               echo "${config_single}_$dir_single 0" >> $logfile
+               $echo "${config_single}_$dir_single 0" >> $logfile
             fi
             # add /. to directory for also backing up softlinks
             dir_single_soft_link_path="$dir_single/."
             # get the stamp for the last backup
-            last_stamp=$(grep "^${config_single}_$dir_single " $logfile | cut -d" " -f2)
+            last_stamp=$($grep "^${config_single}_$dir_single " $logfile | $cut -d" " -f2)
             # get the stamp for the next backup
-            now_stamp=$(expr $last_stamp + $rotate_stamp)
+            now_stamp=$($expr $last_stamp + $rotate_stamp)
             do_backup="no"
             do_monthly="no"
             do_normal="no"
@@ -114,17 +157,17 @@ do
                if [ "$rotate" = "inc" ]
                then
                   # tar is not able to handle unix-timestamps, so we calculate the required one
-                  tar_stamp=$(date -d "1970-01-01 $last_stamp sec" +%F)
+                  tar_stamp=$($date -d "1970-01-01 $last_stamp sec" +%F)
                   # only changed files since last modification in backup
                   if [ -f "$dir_single_soft_link_path/backup.ignore" ]
                   then
-                     nice -n 19 tar czf "$dir_single.$backup_stamp.tar.gz" --warning=none --exclude-from="$dir_single_soft_link_path/backup.ignore" -N "$tar_stamp" "$dir_single_soft_link_path"
+                     $nice -n 19 $tar czf "$dir_single.$backup_stamp.tar.gz" --warning=none --exclude-from="$dir_single_soft_link_path/backup.ignore" -N "$tar_stamp" "$dir_single_soft_link_path"
                   else
-                     nice -n 19 tar czf "$dir_single.$backup_stamp.tar.gz" --warning=none -N "$tar_stamp" "$dir_single_soft_link_path"
+                     $nice -n 19 $tar czf "$dir_single.$backup_stamp.tar.gz" --warning=none -N "$tar_stamp" "$dir_single_soft_link_path"
                   fi
                   rsync_server "$dir_single.$backup_stamp.tar.gz" "$backupdir/$backupdirsingle/" "${config_single}_$dir_single"
                   # delete backups from local
-                  rm -f "$dir_single.$backup_stamp.tar.gz"
+                  $rm -f "$dir_single.$backup_stamp.tar.gz"
                fi # if [ "$rotate" = "inc" ]
                # we want a full backup
                if [ "$do_monthly" = "yes" -o "$do_normal" = "yes" ]
@@ -132,29 +175,29 @@ do
                   # backup everything
                   if [ -f "$dir_single_soft_link_path/backup.ignore" ]
                   then
-                     nice -n 19 tar czf "$dir_single.tar.gz" --warning=none --exclude-from="$dir_single_soft_link_path/backup.ignore" "$dir_single_soft_link_path"
+                     $nice -n 19 $tar czf "$dir_single.tar.gz" --warning=none --exclude-from="$dir_single_soft_link_path/backup.ignore" "$dir_single_soft_link_path"
                   else
-                     nice -n 19 tar czf "$dir_single.tar.gz" --warning=none "$dir_single_soft_link_path"
+                     $nice -n 19 $tar czf "$dir_single.tar.gz" --warning=none "$dir_single_soft_link_path"
                   fi
                   # check wether we should rotate
                   if [ "$rotate" != "inc" -a "$do_normal" = "yes" ]
                   then
 
                      # mount for renaming
-                     sshfs $userserver:$backupdir $backupdir_local -o IdentityFile=$keyfile -o IdentitiesOnly=yes
+                     $sshfs $userserver:$backupdir $backupdir_local -o IdentityFile=$keyfile -o IdentitiesOnly=yes
 
                      # rotate old backups
                      for count in `seq $rotate -1 2`
                      do
                         count_last=$(expr $count - 1)
-                        rm -f "$backupdir_local/$backupdirsingle/$dir_single.tar.gz.$count"
-                        mv -f "$backupdir_local/$backupdirsingle/$dir_single.tar.gz.$count_last" "$backupdir_local/$backupdirsingle/$dir_single.tar.gz.$count" > /dev/null 2>&1
+                        $rm -f "$backupdir_local/$backupdirsingle/$dir_single.tar.gz.$count"
+                        $mv -f "$backupdir_local/$backupdirsingle/$dir_single.tar.gz.$count_last" "$backupdir_local/$backupdirsingle/$dir_single.tar.gz.$count" > /dev/null 2>&1
                      done
-                     rm -f "$backupdir_local/$backupdirsingle/$dir_single.tar.gz.1"
-                     mv -f "$backupdir_local/$backupdirsingle/$dir_single.tar.gz" "$backupdir_local/$backupdirsingle/$dir_single.tar.gz.1" > /dev/null 2>&1
+                     $rm -f "$backupdir_local/$backupdirsingle/$dir_single.tar.gz.1"
+                     $mv -f "$backupdir_local/$backupdirsingle/$dir_single.tar.gz" "$backupdir_local/$backupdirsingle/$dir_single.tar.gz.1" > /dev/null 2>&1
 
                      # unmount
-                     umount $backupdir_local
+                     $umount $backupdir_local
 
                   fi # if [ "$rotate" != "inc" -a "$do_normal" = "yes" ]
                   # copy new backups
@@ -165,12 +208,12 @@ do
                   if [ "$do_monthly" = "yes" ]
                   then
                      #TODO: check why move sometimes causes problems
-                     nice -n 19 cp "$dir_single.tar.gz" "$dir_single.$backup_stamp.month.tar.gz"
+                     $nice -n 19 $cp "$dir_single.tar.gz" "$dir_single.$backup_stamp.month.tar.gz"
                      rsync_server "$dir_single.$backup_stamp.month.tar.gz" "$backupdir/$backupdirsingle/" "${config_single}_$dir_single"
                   fi
                   # delete backups from local
-                  rm -f "$dir_single.$backup_stamp.month.tar.gz"
-                  rm -f "$dir_single.tar.gz"
+                  $rm -f "$dir_single.$backup_stamp.month.tar.gz"
+                  $rm -f "$dir_single.tar.gz"
                fi # if [ "$do_monthly" = "yes" -o "$do_normal" = "yes" ]
             fi # if [ "$do_backup" = "yes" ]
          fi # if [ -e "$dir_single" ]