Merge pull request #3375 from ThomasWaldmann/docs-fixes

misc. docs fixes / updates

docs/faq.rst

@@ -94,7 +94,7 @@ retransfer the data since the last checkpoint.
 
 If a backup was interrupted, you normally do not need to do anything special,
 just invoke ``borg create`` as you always do. If the repository is still locked,
-you may need to run ``borg break-lock`` before the next backup. You may use the 
+you may need to run ``borg break-lock`` before the next backup. You may use the
 same archive name as in previous attempt or a different one (e.g. if you always
 include the current datetime), it does not matter.
 
@@ -265,7 +265,7 @@ Say you want to prune ``/var/log`` faster than the rest of
 archive *names* and then implement different prune policies for
 different prefixes. For example, you could have a script that does::
 
-    borg create $REPOSITORY:main-$(date +%Y-%m-%d) --exclude /var/log /
+    borg create --exclude /var/log $REPOSITORY:main-$(date +%Y-%m-%d) /
     borg create $REPOSITORY:logs-$(date +%Y-%m-%d) /var/log
 
 Then you would have two different prune calls with different policies::

docs/usage/create.rst

@@ -23,7 +23,7 @@ Examples
 
     # Backup the root filesystem into an archive named "root-YYYY-MM-DD"
     # use zlib compression (good, but slow) - default is lz4 (fast, low compression ratio)
-    $ borg create -C zlib,6 /path/to/repo::root-{now:%Y-%m-%d} / --one-file-system
+    $ borg create -C zlib,6 --one-file-system /path/to/repo::root-{now:%Y-%m-%d} /
 
     # Backup a remote host locally ("pull" style) using sshfs
     $ mkdir sshfs-mount

docs/usage/mount.rst

@@ -36,6 +36,12 @@ Examples
     # which does not support lazy processing of archives.
     $ borg mount -o versions --glob-archives '*-my-home' --last 10 /path/to/repo /tmp/mymountpoint
 
+    # Exclusion options are supported.
+    # These can speed up mounting and lower memory needs significantly.
+    $ borg mount /path/to/repo /tmp/mymountpoint only/that/path
+    $ borg mount --exclude '...' /path/to/repo /tmp/mymountpoint
+
+
 borgfs
 ++++++
 

docs/usage/notes.rst

@@ -61,6 +61,16 @@ affect metadata stream deduplication: if only this timestamp changes between
 backups and is stored into the metadata stream, the metadata stream chunks
 won't deduplicate just because of that.
 
+``--nobsdflags``
+~~~~~~~~~~~~~~~~
+
+You can use this to not query and store (or not extract and set) bsdflags -
+in case you don't need them or if they are broken somehow for your fs.
+
+On Linux, dealing with the bsflags needs some additional syscalls.
+Especially when dealing with lots of small files, this causes a noticable
+overhead, so you can use this option also for speeding up operations.
+
 ``--umask``
 ~~~~~~~~~~~
 

docs/usage/tar.rst

@@ -11,11 +11,11 @@ Examples
     $ borg export-tar /path/to/repo::Monday Monday.tar.gz --exclude '*.so'
 
     # use higher compression level with gzip
-    $ borg export-tar testrepo::linux --tar-filter="gzip -9" Monday.tar.gz
+    $ borg export-tar --tar-filter="gzip -9" testrepo::linux Monday.tar.gz
 
-    # export a gzipped tar, but instead of storing it on disk,
+    # export a tar, but instead of storing it on disk,
     # upload it to a remote site using curl.
-    $ borg export-tar ... --tar-filter="gzip" - | curl --data-binary @- https://somewhere/to/POST
+    $ borg export-tar /path/to/repo::Monday - | curl --data-binary @- https://somewhere/to/POST
 
     # remote extraction via "tarpipe"
     $ borg export-tar /path/to/repo::Monday - | ssh somewhere "cd extracted; tar x"

docs/usage_general.rst.inc

@@ -1,3 +1,20 @@
+Positional Arguments and Options: Order matters
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Borg only supports taking options (``-s`` and ``--progress`` in the example)
+to the left or right of all positional arguments (``repo::archive`` and ``path``
+in the example), but not in between them:
+
+::
+
+    borg create -s --progress repo::archive path  # good and preferred
+    borg create repo::archive path -s --progress  # also works
+    borg create -s repo::archive path --progress  # works, but ugly
+    borg create repo::archive -s --progress path  # BAD
+
+This is due to a problem in the argparse module: http://bugs.python.org/issue15112
+
+
 Repository URLs
 ~~~~~~~~~~~~~~~
 
@@ -373,6 +390,7 @@ Besides regular file and directory structures, Borg can preserve
     By default the metadata to create them with mknod(2), mkfifo(2) etc. is stored.
 * hardlinked regular files, devices, FIFOs (considering all items in the same archive)
 * timestamps in nanosecond precision: mtime, atime, ctime
+* other timestamps: birthtime (on platforms supporting it)
 * permissions:
 
   * IDs of owning user and owning group

src/borg/archiver.py

@@ -2761,12 +2761,6 @@ class Archiver:
           it had before a content change happened. This can be used maliciously as well as
           well-meant, but in both cases mtime based cache modes can be problematic.
 
-        By default, borg tries to archive all metadata that it supports archiving.
-        If that is not what you want or need, there are some tuning options:
-
-        - --nobsdflags (getting bsdflags has a speed penalty under Linux)
-        - --noatime (if atime changes frequently, the metadata stream will dedup badly)
-
         The mount points of filesystems or filesystem snapshots should be the same for every
         creation of a new archive to ensure fast operation. This is because the file cache that
         is used to determine changed files quickly uses absolute filenames.