basic low disk storage swap code

Author: generationtech

README.md

@@ -5,8 +5,8 @@ Allows for creating smaller backups with privacy while allowing
 for partial recovery should any individual incremental archive
 file be damaged.
 
-Other similar solutions using encryption result in total data
-loss past failed incremental archive file.
+Other similar solutions using incremental files, compression, and
+encryption result in total data loss past failed incremental archive file.
 
 ## Help
 

bacchus.sh

@@ -19,6 +19,8 @@ export BCS_COMPRESS="$_arg_compress"
 export BCS_DECRYPTDIR="$_arg_decryptdir"
 export BCS_VERBOSETAR="$_arg_verbosetar"
 export BCS_PASSWORD="$password"
+# export BCS_LOWDISKSPACE=5230
+export BCS_LOWDISKSPACE=1385
 
 PrintOptions()
 {

scripts/bacchus-backup-new-volume.sh

@@ -14,6 +14,27 @@
 # NOTE: If no password is supplied (as BCS_PASSWORD environment var),
 #       bacchus does not encrypt backup
 
+BCS_DEST=$(<"$BCS_PATHFILE")
+while true; do
+  availablespace=$(df -kP "$BCS_DEST" | awk '{print $4}' | tail -1)
+  lowspace="$(( BCS_VOLUMESIZE * BCS_LOWDISKSPACE ))"
+  printf "availablespace %s\n" "$availablespace"
+  printf "lowspace       %s\n" "$lowspace"
+  if [ "$availablespace" -lt "$lowspace" ]; then
+    printf "LOW AVAILABLE SPACE on %s (%s < %s)\n" "$BCS_DEST" "$availablespace" "$lowspace"
+    printf "Either free-up space or swap out storage device and press enter\n"
+    printf "Or enter a new destination path and press enter\n"
+    read newpath
+    printf "\n"
+    if [ -n "$newpath" ]; then
+      BCS_DEST="$newpath"
+      echo "$BCS_DEST" > "$BCS_PATHFILE"
+    fi
+  else
+    break
+  fi
+done
+
 tararchivedir=$(dirname "$TAR_ARCHIVE")
 TAR_ARCHIVE=$(basename "$TAR_ARCHIVE")
 name=$(expr "$TAR_ARCHIVE" : '\(.*\)-.*')

scripts/bacchus-backup.sh

@@ -7,8 +7,8 @@
 # for partial recovery should any individual incremental archive
 # file be damaged.
 #
-# Other similar solutions using encryption result in total data
-# loss past failed incremental archive file.
+# Other similar solutions using incremental files, compression, and
+# encryption result in total data loss past failed incremental archive file.
 #
 #	Usage:
 #	bacchus-backup.sh
@@ -39,10 +39,13 @@ Cleanup()
   fi
   if [[ "$BCS_TMPFILE" == *"tmp"* ]]; then
     rm -rf "$BCS_TMPFILE"
+    rm -rf "$BCS_PATHFILE"
   fi
 }
 
 BCS_TMPFILE=$(mktemp -u /tmp/baccus-XXXXXX)
+export BCS_PATHFILE="$BCS_TMPFILE".dest
+echo "$BCS_DEST" > "$BCS_PATHFILE"
 trap Cleanup EXIT
 
 if [ "$BCS_COMPRESS" == "off" ] && [ -z "$BCS_PASSWORD" ]; then
@@ -74,6 +77,9 @@ fi
 tar "$tarargs" --format=posix --sort=name --new-volume-script "$scriptdir/bacchus-backup-new-volume.sh" -L "$BCS_VOLUMESIZE" --volno-file "$BCS_TMPFILE" -f "$BCS_TARDIR"/"$BCS_BASENAME".tar $BCS_SOURCE
 
 # Setup tar variables to call new-volume script for handling last (or possibly only) archive volume
+if [ "$BCS_COMPRESS" == "off" ] && [ -z "$BCS_PASSWORD" ]; then
+  BCS_TARDIR=$(<"$BCS_PATHFILE")
+fi
 vol=$(cat "$BCS_TMPFILE")
 case "$vol" in
   1)  export TAR_ARCHIVE="$BCS_TARDIR"/"$BCS_BASENAME".tar

scripts/bacchus-restore-new-volume.sh

@@ -25,15 +25,32 @@ oldname="${TAR_ARCHIVE##*/}"
 
 echo "$filename"
 
-source="$BCS_SOURCE"/"$filename"
-if [ "$BCS_COMPRESS" == "on" ]; then
-  source="$source".gz
-  rm -f "$BCS_COMPRESDIR"/"$oldname"
-fi
-if [ -n "$BCS_PASSWORD" ]; then
-  source="$source".gpg
-  rm -f "$BCS_DECRYPTDIR"/"$oldname"
-fi
+BCS_SOURCE=$(<"$BCS_PATHFILE")
+while true; do
+  source="$BCS_SOURCE"/"$filename"
+  if [ "$BCS_COMPRESS" == "on" ]; then
+    source="$source".gz
+    rm -f "$BCS_COMPRESDIR"/"$oldname"
+  fi
+  if [ -n "$BCS_PASSWORD" ]; then
+    source="$source".gpg
+    rm -f "$BCS_DECRYPTDIR"/"$oldname"
+  fi
+
+  if [ ! -f "$source" ]; then
+    printf "Archive volume %s NOT FOUND in %s\n" $(basename "$source") "$BCS_SOURCE"
+    printf "Either place this file in the source directory and press enter\n"
+    printf "Or enter a new source path and press enter\n"
+    read newpath
+    printf "\n"
+    if [ -n "$newpath" ]; then
+      BCS_SOURCE="$newpath"
+      echo "$BCS_SOURCE" > "$BCS_PATHFILE"
+    fi
+  else
+    break
+  fi
+done
 
 case "$TAR_SUBCOMMAND" in
   -x) test -r "$source" || exit 1

scripts/bacchus-restore.sh

@@ -7,8 +7,8 @@
 # for partial recovery should any individual incremental archive
 # file be damaged.
 #
-# Other similar solutions using encryption result in total data
-# loss of past failed incremental archive file.
+# Other similar solutions using incremental files, compression, and
+# encryption result in total data loss past failed incremental archive file.
 #
 #	Usage:
 #	bacchus-restore.sh
@@ -19,6 +19,7 @@
 #	BCS_BASENAME   - Base filename for backup archive
 #	BCS_VOLUMESIZE - Used LOCALLY here, not from environment
 #	BCS_RAMDISK    - Boolean enabling ramdisk
+#	BCS_TARDIR     - Intermediate area for tar
 #	BCS_DECRYPTDIR - Intermediate area to store unencrypted volume
 #	BCS_COMPRESDIR - Intermediate area to store uncompressed volume
 #	BCS_COMPRESS   - Boolean enabling compression
@@ -40,10 +41,13 @@ Cleanup()
   fi
   if [[ "$BCS_TMPFILE" == *"tmp"* ]]; then
     rm -rf "$BCS_TMPFILE"
+    rm -rf "$BCS_PATHFILE"
   fi
 }
 
 BCS_TMPFILE=$(mktemp -u /tmp/baccus-XXXXXX)
+export BCS_PATHFILE="$BCS_TMPFILE".dest
+echo "$BCS_SOURCE" > "$BCS_PATHFILE"
 trap Cleanup EXIT
 
 if [ "$BCS_COMPRESS" == "off" ] && [ -z "$BCS_PASSWORD" ]; then

source/bacchus.m4

@@ -19,6 +19,8 @@ export BCS_COMPRESS="$_arg_compress"
 export BCS_DECRYPTDIR="$_arg_decryptdir"
 export BCS_VERBOSETAR="$_arg_verbosetar"
 export BCS_PASSWORD="$password"
+# export BCS_LOWDISKSPACE=5230
+export BCS_LOWDISKSPACE=1385
 
 PrintOptions()
 {