ddrescue command generator

ddtemplate.m4

define(`LQ',`changequote(<,>)`dnl'
changequote`'')dnl
define(`RQ',`changequote(<,>)dnl`
'changequote`'')dnl
# m4 -DSRCDRV=$1 -DDESTDIR=$2 -DIMGNAME=$3 -DLOGNAME=$4 ddtemplate > $2/rescue.sh;

if [ -e curr_phase_`'DESTDIR ]; then
  CURR_PHASE=`'LQ()`'cat curr_phase_`'DESTDIR`'`'LQ()`'
else
  CURR_PHASE=1
fi

DD_PHASE1="ddrescue --no-split SRCDRV IMGNAME LOGNAME"
DD_PHASE2="ddrescue --direct --max-retries=3 SRCDRV IMGNAME LOGNAME"
DD_PHASE3="ddrescue --direct --retrim --max-retries=3 SRCDRV IMGNAME LOGNAME"
#DD_PHASE1=/bin/true
#DD_PHASE2=/bin/true
#DD_PHASE3=/bin/true
define(DD_CMD, `if [ $CURR_PHASE = $2 ]; then
  echo "Phase $2... $1"
  $1
  PHASE_RET=$?
  if [ $PHASE_RET = 0 ]; then
    echo eval($2+1) > curr_phase_`'DESTDIR`'
    CURR_PHASE=eval($2+1)
  else
    echo "ddrescue phase $2 failed with error code $PHASE_RET..."
    exit 1
  fi
fi')dnl
DD_CMD($DD_PHASE1, 1)

DD_CMD($DD_PHASE2, 2)

DD_CMD($DD_PHASE3, 3)
echo "ddrescue script completed successfully!"

mkrescue

#!/bin/sh
#Syntax: ./mkrescue [source_drive] [destdir] [image_name] [log_name]

if [ ! $( id -u ) = 0 ]; then
  echo "Please run this script as root."
  exit 1
fi

if [ ! -e $1 ]; then
  echo "Source drive does not exist."
fi

if [ ! -e $2 ]; then
  echo "Creating directory $2..."
  if mkdir -v $2; then
    echo "Ok"
  else
    echo "Directory creation failed."
    exit 2
  fi
fi

if [ -e $2/rescue.sh ]; then
  echo "Rescue script exists already... not overwriting."
  exit 4
fi

if m4 -DSRCDRV=$1 -DDESTDIR=$2 -DIMGNAME=$3 -DLOGNAME=$4 ddtemplate.m4 > $2/rescue.sh; then
  chmod 755 $2/rescue.sh
  echo "Rescue script ready in $2/rescue.sh"
else
  echo "Script creation failed..."
  exit 3
fi