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https://github.com/ceph/ceph
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163 lines
4.0 KiB
Groff
163 lines
4.0 KiB
Groff
.TH "CEPH-DENCODER" "8" "September 27, 2012" "dev" "Ceph"
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.SH NAME
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ceph-dencoder \- ceph encoder/decoder utility
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.\" Man page generated from reStructuredText.
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.
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.SH SYNOPSIS
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.nf
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\fBceph\-dencoder\fP [commands...]
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.fi
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.sp
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.SH DESCRIPTION
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.sp
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\fBceph\-dencoder\fP is a utility to encode, decode, and dump ceph data
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structures. It is used for debugging and for testing inter\-version
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compatibility.
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.sp
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\fBceph\-dencoder\fP takes a simple list of commands and performs them
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in order.
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.SH COMMANDS
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.INDENT 0.0
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.TP
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.B version
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Print the version string for the \fBceph\-dencoder\fP binary.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B import <file>
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Read a binary blob of encoded data from the given file. It will be
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placed in an in\-memory buffer.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B export <file>
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Write the contents of the current in\-memory buffer to the given
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file.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B list_types
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List the data types known to this build of \fBceph\-dencoder\fP.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B type <name>
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Select the given type for future \fBencode\fP or \fBdecode\fP operations.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B decode
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Decode the contents of the in\-memory buffer into an instance of the
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previously selected type. If there is an error, report it.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B encode
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Encode the contents of the in\-memory instance of the previously
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selected type to the in\-memory buffer.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B dump_json
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Print a JSON\-formatted description of the in\-memory object.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B count_tests
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Print the number of built\-in test instances of the previosly
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selected type that \fBceph\-dencoder\fP is able to generate.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B select_test <n>
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Select the given build\-in test instance as a the in\-memory instance
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of the type.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B get_features
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Print the decimal value of the feature set supported by this version
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of \fBceph\-dencoder\fP. Each bit represents a feature. These correspond to
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CEPH_FEATURE_* defines in src/include/ceph_features.h.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B set_features <f>
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Set the feature bits provided to \fBencode\fP to \fIf\fP. This allows
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you to encode objects such that they can be understood by old
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versions of the software (for those types that support it).
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.UNINDENT
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.SH EXAMPLE
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.sp
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Say you want to examine an attribute on an object stored by \fBceph\-osd\fP. You can do:
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.sp
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.nf
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.ft C
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$ cd /mnt/osd.12/current/2.b_head
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$ attr \-l foo_bar_head_EFE6384B
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Attribute "ceph.snapset" has a 31 byte value for foo_bar_head_EFE6384B
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Attribute "ceph._" has a 195 byte value for foo_bar_head_EFE6384B
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$ attr foo_bar_head_EFE6384B \-g ceph._ \-q > /tmp/a
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$ ceph\-dencoder type object_info_t import /tmp/a decode dump_json
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{ "oid": { "oid": "foo",
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"key": "bar",
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"snapid": \-2,
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"hash": 4024842315,
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"max": 0},
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"locator": { "pool": 2,
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"preferred": \-1,
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"key": "bar"},
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"category": "",
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"version": "9\(aq1",
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"prior_version": "0\(aq0",
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"last_reqid": "client.4116.0:1",
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"size": 1681,
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"mtime": "2012\-02\-21 08:58:23.666639",
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"lost": 0,
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"wrlock_by": "unknown.0.0:0",
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"snaps": [],
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"truncate_seq": 0,
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"truncate_size": 0,
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"watchers": {}}
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.ft P
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.fi
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.SH AVAILABILITY
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.sp
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\fBceph\-dencoder\fP is part of the Ceph distributed file system. Please
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refer to the Ceph documentation at \fI\%http://ceph.com/docs\fP for more
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information.
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.SH SEE ALSO
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.sp
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\fBceph\fP(8)
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.SH COPYRIGHT
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2012, Inktank Storage, Inc.
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.\" Generated by docutils manpage writer.
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.
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