117 lines
4.2 KiB
Markdown
117 lines
4.2 KiB
Markdown
git-annex comes with some built-in [[preferred_content]] settings, that can
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be used with repositories that are in special groups. To make a
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repository use one of these, just set its preferred content expression
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to "standard", and put it in one of these groups.
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(Note that most of these standard expressions also make the repository
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want to get any content that is only currently available on untrusted and
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dead repositories. So if an untrusted repository gets connected,
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any repository that can will back it up.)
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### client
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All content is wanted, unless it's for a file in a "archive" directory,
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which has reached an archive repository, or is unused.
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`(((exclude=*/archive/* and exclude=archive/*) or (not (copies=archive:1 or copies=smallarchive:1))) and not unused) or approxlackingcopies=1`
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### transfer
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Use for repositories that are used to transfer data between other
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repositories, but do not need to retain data themselves. For
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example, a repository on a server, or in the cloud, or a small
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USB drive used in a sneakernet.
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The preferred content expression for these causes them to get and retain
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data until all clients have a copy.
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`not (inallgroup=client and copies=client:2) and ($client)`
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(Where $client is a copy of the preferred content expression used for
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clients.)
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The "copies=client:2" part of the above handles the case where
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there is only one client repository. It makes a transfer repository
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speculatively prefer content in this case, even though it as of yet
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has nowhere to transfer it to. Presumably, another client repository
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will be added later.
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### backup
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All content is wanted. Even content of old/deleted files.
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`include=* or unused`
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### incremental backup
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Only wants content that's not already backed up to another backup
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or incremental backup repository.
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`((include=* or unused) and (not copies=backup:1) and (not copies=incrementalbackup:1)) or approxlackingcopies=1`
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### small archive
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Only wants content that's located in an "archive" directory, and
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only if it's not already been archived somewhere else.
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`((include=*/archive/* or include=archive/*) and not (copies=archive:1 or copies=smallarchive:1)) or approxlackingcopies=1`
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### full archive
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All content is wanted, unless it's already been archived somewhere else.
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`(not (copies=archive:1 or copies=smallarchive:1)) or approxlackingcopies=1`
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Note that if you want to archive multiple copies (not a bad idea!),
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you can set `groupwanted archive` to a version of
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the above preferred content expression with a larger number of copies
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than 1. Then make the archive repositories have a preferred
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content expression of "groupwanted" in order to use your modified
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version.
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### source
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Use for repositories where files are often added, but that do not need to
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retain files for local use. For example, a repository on a camera, where
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it's desirable to remove photos as soon as they're transferred elsewhere.
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The preferred content expression for these causes them to only retain
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data until a copy has been sent to some other repository.
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`not (copies=1)`
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### manual
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This gives you nearly full manual control over what content is stored in the
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repository. This allows using the [[assistant]] without it trying to keep a
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local copy of every file. Instead, you can manually run `git annex get`,
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`git annex drop`, etc to manage content. Only content that is already
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present is wanted.
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The exception to this manual control is that content that a client
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repository would not want is not wanted. So, files in archive
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directories are not wanted once their content has
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reached an archive repository.
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`present and ($client)`
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(Where $client is a copy of the preferred content expression used for
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clients.)
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### public
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This is used for publishing information to a repository that can be
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publically accessed. Only files in a directory with a particular name
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will be published. (The directory can be located anywhere in the
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repository.)
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The name of the directory can be configured using
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`git annex enableremote $remote preferreddir=$dirname`
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### unwanted
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Use for repositories that you don't want to exist. This will result
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in any content on them being moved away to other repositories. (Works
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best when the unwanted repository is also marked as untrusted or dead.)
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`exclude=*`
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