# SYNOPSIS
-bup split [-r *host*:*path*] <-b|-t|-c|-n *name*> [-v] [-q]
- [--bench] [--max-pack-size=*bytes*] [-0|-9]
- [--max-pack-objects=*n*] [--fanout=*count]
- [--git-ids] [--keep-boundaries] [filenames...]
+bup split \[-t\] \[-c\] \[-n *name*\] COMMON\_OPTIONS
+
+bup split -b COMMON\_OPTIONS
+
+bup split --copy COMMON\_OPTIONS
+
+bup split --noop \[-t|-b\] COMMON\_OPTIONS
+
+COMMON\_OPTIONS
+ ~ \[-r *host*:*path*\] \[-v\] \[-q\] \[-d *seconds-since-epoch*\] \[\--bench\]
+ \[\--max-pack-size=*bytes*\] \[-#\] \[\--bwlimit=*bytes*\]
+ \[\--max-pack-objects=*n*\] \[\--fanout=*count*\]
+ \[\--keep-boundaries\] \[\--git-ids | filenames...\]
# DESCRIPTION
To get the data back, use `bup-join`(1).
-# OPTIONS
-
--r, --remote=*host*:*path*
-: save the backup set to the given remote server. If
- *path* is omitted, uses the default path on the remote
- server (you still need to include the ':'). The connection to the
- remote server is made with SSH. If you'd like to specify which port, user
- or private key to use for the SSH connection, we recommend you use the
- `~/.ssh/config` file.
+# MODES
--b, --blobs
-: output a series of git blob ids that correspond to the
- chunks in the dataset.
+These options select the primary behavior of the command, with -n
+being the most likely choice.
--t, --tree
-: output the git tree id of the resulting dataset.
-
--c, --commit
-: output the git commit id of the resulting dataset.
-
--n, --name=*name*
+-n, \--name=*name*
: after creating the dataset, create a git branch
named *name* so that it can be accessed using
that name. If *name* already exists, the new dataset
- will be considered a descendant of the old *name*.
+ will be considered a descendant of the old *name*.
(Thus, you can continually create new datasets with
the same name, and later view the history of that
- dataset to see how it has changed over time.)
-
--q, --quiet
+ dataset to see how it has changed over time.) The original data
+ will also be available as a top-level file named "data" in the VFS,
+ accessible via `bup fuse`, `bup ftp`, etc.
+
+-t, \--tree
+: output the git tree id of the resulting dataset.
+
+-c, \--commit
+: output the git commit id of the resulting dataset.
+
+-b, \--blobs
+: output a series of git blob ids that correspond to the chunks in
+ the dataset. Incompatible with -n, -t, and -c.
+
+\--noop
+: read the data and split it into blocks based on the "bupsplit"
+ rolling checksum algorithm, but don't store anything in the repo.
+ Can be combined with -b or -t to compute (but not store) the git
+ blobs or tree ids for the dataset. This is mostly useful for
+ benchmarking and validating the bupsplit algorithm. Incompatible
+ with -n and -c.
+
+\--copy
+: like `--noop`, but also write the data to stdout. This can be
+ useful for benchmarking the speed of read+bupsplit+write for large
+ amounts of data. Incompatible with -n, -t, -c, and -b.
+
+# OPTIONS
+
+-r, \--remote=*host*:*path*
+: save the backup set to the given remote server. If *path* is
+ omitted, uses the default path on the remote server (you still
+ need to include the ':'). The connection to the remote server is
+ made with SSH. If you'd like to specify which port, user or
+ private key to use for the SSH connection, we recommend you use
+ the `~/.ssh/config` file. Even though the destination is remote,
+ a local bup repository is still required.
+
+-d, \--date=*seconds-since-epoch*
+: specify the date inscribed in the commit (seconds since 1970-01-01).
+
+-q, \--quiet
: disable progress messages.
--v, --verbose
+-v, \--verbose
: increase verbosity (can be used more than once).
---git-ids
+\--git-ids
: stdin is a list of git object ids instead of raw data.
`bup split` will read the contents of each named git
object (if it exists in the bup repository) and split
hashsplitting instead. This option is probably most
useful when combined with `--keep-boundaries`.
---keep-boundaries
+\--keep-boundaries
: if multiple filenames are given on the command line,
they are normally concatenated together as if the
content all came from a single file. That is, the
only one of the files; the end of one of the input
files always ends a blob.
---noop
-: read the data and split it into blocks based on the "bupsplit"
- rolling checksum algorithm, but don't do anything with
- the blocks. This is mostly useful for benchmarking.
-
---copy
-: like --noop, but also write the data to stdout. This
- can be useful for benchmarking the speed of read+bupsplit+write
- for large amounts of data.
-
---bench
+\--bench
: print benchmark timings to stderr.
---max-pack-size=*bytes*
+\--max-pack-size=*bytes*
: never create git packfiles larger than the given number
of bytes. Default is 1 billion bytes. Usually there
is no reason to change this.
---max-pack-objects=*numobjs*
+\--max-pack-objects=*numobjs*
: never create git packfiles with more than the given
number of objects. Default is 200 thousand objects.
Usually there is no reason to change this.
---fanout=*numobjs*
-: when splitting very large files, never put more than
- this number of git blobs in a single git tree. Instead,
- generate a new tree and link to that. Default is
- 4096 objects per tree.
+\--fanout=*numobjs*
+: when splitting very large files, try and keep the number
+ of elements in trees to an average of *numobjs*.
---bwlimit=*bytes/sec*
+\--bwlimit=*bytes/sec*
: don't transmit more than *bytes/sec* bytes per second
to the server. This is good for making your backups
not suck up all your network bandwidth. Use a suffix
like k, M, or G to specify multiples of 1024,
1024*1024, 1024*1024*1024 respectively.
--0
-: set the compression level to 0 (no compression)
-
- If no compression level is set it defaults to 1.
+-*#*, \--compress=*#*
+: set the compression level to # (a value from 0-9, where
+ 9 is the highest and 0 is no compression). The default
+ is 1 (fast, loose compression)
--9
-: set the compression level to 9 (highest compression, slowest)
+# EXAMPLES
-# EXAMPLE
-
$ tar -cf - /etc | bup split -r myserver: -n mybackup-tar
tar: Removing leading /' from member names
Indexing objects: 100% (196/196), done.
projects / bup.git / blobdiff