added support for B2 backend

README.md

@@ -139,6 +139,9 @@ There are many ways to do so, here are some examples (adapt the path to your act
 For the [Amazon S3](https://aws.amazon.com/s3/) storage backend *`optional`*
 * [s3cmd](http://s3tools.org/s3cmd) *`optional`*
 
+For the [Backblaze B2](https://www.backblaze.com/b2) storage backend *`optional`*
+* [python-b2](https://pypi.python.org/pypi/b2) *`optional`*
+
 For the [Google Cloud Storage](https://cloud.google.com/storage/) storage backend *`optional`*
 * [boto](https://github.com/boto/boto) (may already have been installed with duplicity)
 * [gsutil](https://cloud.google.com/storage/docs/gsutil) *`optional`*

duplicity-backup.conf.example

@@ -115,6 +115,7 @@ DEST="s3+http://foobar-backup-bucket/backup-folder/"
 #DEST="webdav[s]://user[:password]@other.host[:port]/some_dir"
 #DEST="gdocs://foobar_google_account/some_dir"
 #DEST="swift://foobar_swift_container/some_dir"
+#DEST="b2://some_account_id[:some_application_key]@some_bucket_name/some_dir"
 
 
 # ------------------------------------------------------------------------------

duplicity-backup.sh

@@ -403,6 +403,9 @@ NO_S3CMD_CFG="WARNING: s3cmd is not configured, run 's3cmd --configure' \
 in order to retrieve remote file size information. Remote file \
 size information unavailable."
 
+NO_B2CMD="WARNING: b2 not found in PATH, remote file size information \
+unavailable. Is the python-b2 package installed?"
+
 README_TXT="In case you've long forgotten, this is a backup script that you used to backup some files (most likely remotely at Amazon S3). In order to restore these files, you first need to import your GPG private(s) key(s) (if you haven't already). The key(s) is/are in this directory and the following command(s) should do the trick:\n\nIf you were using the same key for encryption and signature:\n  gpg --allow-secret-key-import --import duplicity-backup-encryption-and-sign-secret.key.txt\nOr if you were using two separate keys for encryption and signature:\n  gpg --allow-secret-key-import --import duplicity-backup-encryption-secret.key.txt\n  gpg --allow-secret-key-import --import duplicity-backup-sign-secret.key.txt\n\nAfter your key(s) has/have been succesfully imported, you should be able to restore your files.\n\nGood luck!"
 
 if  [ "$(echo "${DEST}" | cut -c 1,2)" = "gs" ]; then
@@ -445,6 +448,16 @@ else
   DEST_IS_S3=false
 fi
 
+if  [ "$(echo "${DEST}" | cut -c 1,2)" = "b2" ]; then
+  DEST_IS_B2=true
+  B2CMD="$(which b2)"
+  if [ ! -x "${B2CMD}" ]; then
+    echo "${NO_B2CMD}"; B2CMD_AVAIL=false
+  fi
+else
+  DEST_IS_B2=false
+fi
+
 config_sanity_fail()
 {
   EXPLANATION=$1
@@ -689,6 +702,34 @@ get_remote_file_size()
           fi
       fi
     ;;
+    "b2")
+      FRIENDLY_TYPE_NAME="Backblaze B2"
+      if ${B2CMD_AVAIL}; then
+        if [[ -n ${FTP_PASSWORD} ]]; then
+          APP_KEY=${FTP_PASSWORD}
+        else
+          APP_KEY=$(echo "${DEST}" | cut -d":" -f 3 | cut -d"@" -f 1)
+        fi
+        ACC_ID=$(echo "${DEST}" | cut -d"/" -f 3 | cut -d"@" -f 1 | cut -d ":" -f 1)
+        BUCKET=$(echo "${DEST}" | cut -d"@" -f2 | cut -d"/" -f1)
+        if [[ -z ${APP_KEY} ]] || [[ -z ${ACC_ID} ]]; then
+          SIZE="-b2 authentication wrong-"
+          return
+        fi
+        if [[ -z ${BUCKET} ]]; then
+          SIZE="-b2 bucket wrong-"
+          return
+        fi
+        ${B2CMD} authorize-account ${ACC_ID} ${APP_KEY} 2>&1 >/dev/null
+        if [[ $? -ne 0 ]]; then
+          SIZE="-b2 authentication wrong-"
+          return
+        fi
+        SIZE=$(${B2CMD} ls --long ${BUCKET} | awk '{ print $5 }' | paste -sd+ | bc | numfmt --to=iec)
+      else
+              SIZE="-b2 not found in PATH-"
+      fi
+    ;;
     *)
       # not yet available for the other backends
       FRIENDLY_TYPE_NAME=""
@@ -699,7 +740,7 @@ get_remote_file_size()
       echo -e "${SIZE}\t${FRIENDLY_TYPE_NAME} type backend"
   else
       echo "Destination disk use information is currently only available for the following storage backends:"
-      echo "File, SSH, Amazon S3 and Google Cloud"
+      echo "File, SSH, Amazon S3, Google Cloud and Backblaze B2"
   fi
   echo
 }