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3c13bc0321
The main goal is to support gzipped output for future internal calls (e.g. from notmuch-new) to notmuch_database_dump. The additional dependency is not very heavy since xapian already pulls in zlib. We want the dump to be "atomic", in the sense that after running the dump file is either present and complete, or not present. This avoids certain classes of mishaps involving overwriting a good backup with a bad or partial one.
75 lines
2.9 KiB
ReStructuredText
75 lines
2.9 KiB
ReStructuredText
============
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notmuch-dump
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============
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SYNOPSIS
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========
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**notmuch** **dump** [--format=(batch-tag|sup)] [--] [--output=<*file*>] [--] [<*search-term*> ...]
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DESCRIPTION
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===========
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Dump tags for messages matching the given search terms.
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Output is to the given filename, if any, or to stdout.
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These tags are the only data in the notmuch database that can't be
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recreated from the messages themselves. The output of notmuch dump is
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therefore the only critical thing to backup (and much more friendly to
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incremental backup than the native database files.)
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``--gzip``
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Compress the output in a format compatible with **gzip(1)**.
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``--format=(sup|batch-tag)``
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Notmuch restore supports two plain text dump formats, both with one
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message-id per line, followed by a list of tags.
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**batch-tag**
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The default **batch-tag** dump format is intended to more robust
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against malformed message-ids and tags containing whitespace or
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non-\ **ascii(7)** characters. Each line has the form
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+<*encoded-tag*\ > +<*encoded-tag*\ > ... --
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id:<*quoted-message-id*\ >
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Tags are hex-encoded by replacing every byte not matching the
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regex **[A-Za-z0-9@=.,\_+-]** with **%nn** where nn is the two
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digit hex encoding. The message ID is a valid Xapian query,
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quoted using Xapian boolean term quoting rules: if the ID
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contains whitespace or a close paren or starts with a double
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quote, it must be enclosed in double quotes and double quotes
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inside the ID must be doubled. The astute reader will notice
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this is a special case of the batch input format for
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**notmuch-tag(1)**; note that the single message-id query is
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mandatory for **notmuch-restore(1)**.
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**sup**
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The **sup** dump file format is specifically chosen to be
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compatible with the format of files produced by sup-dump. So if
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you've previously been using sup for mail, then the **notmuch
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restore** command provides you a way to import all of your tags
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(or labels as sup calls them). Each line has the following form
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<*message-id*\ > **(** <*tag*\ > ... **)**
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with zero or more tags are separated by spaces. Note that
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(malformed) message-ids may contain arbitrary non-null
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characters. Note also that tags with spaces will not be
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correctly restored with this format.
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With no search terms, a dump of all messages in the database will be
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generated. A "--" argument instructs notmuch that the remaining
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arguments are search terms.
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See **notmuch-search-terms(7)** for details of the supported syntax
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for <search-terms>.
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SEE ALSO
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========
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**notmuch(1)**, **notmuch-config(1)**, **notmuch-count(1)**,
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**notmuch-hooks(5)**, **notmuch-insert(1)**, **notmuch-new(1)**,
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**notmuch-reply(1)**, **notmuch-restore(1)**, **notmuch-search(1)**,
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**notmuch-search-terms(7)**, **notmuch-show(1)**, **notmuch-tag(1)**
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