Provided by: git-annex_6.20180227-1_amd64 bug


       git-annex-preferred-content - which files are wanted in a repository


       Each  repository  has  a  preferred  content  setting,  which  specifies  content that the
       repository wants to have present. These settings can be configured using git  annex  vicfg
       or git annex wanted.  They are used by the --auto option, by git annex sync --content, and
       by the git-annex assistant.

       While preferred content expresses a preference, it can be overridden by simply  using  git
       annex drop. On the other hand, required content settings are enforced; git annex drop will
       refuse to drop a file  if  doing  so  would  violate  its  required  content  settings.  A
       repository's  required  content  can  be  configured  using  git  annex vicfg or git annex


       Preferred content expressions use a similar syntax to  the  git-annex-matching-options(1),
       without the dashes.  For example:

        exclude=archive/* and (include=*.mp3 or smallerthan=1mb)

       The  idea  is  that  you  write  an  expression  that files are matched against. If a file
       matches, the repository wants to store its content. If it doesn't, the repository wants to
       drop its content (if there are enough copies elsewhere to allow removing it).


       include=glob / exclude=glob

              Match files to include, or exclude.

              While  --include=glob  and  --exclude=glob  match  files  relative  to  the current
              directory, preferred content expressions always match files relative to the top  of
              the git repository.

              For  example,  suppose you put files into archive directories when you're done with
              them. Then you could configure your laptop to prefer to  not  retain  those  files,
              like this: exclude=*/archive/*

              Matches  only files that git-annex believes to have the specified number of copies,
              or more. Note that it does not check remotes to verify that the copies still exist.

              To decide if content should be dropped, git-annex evaluates the  preferred  content
              expression under the assumption that the content has *already* been dropped. If the
              content would not be wanted then, the drop can be done.  So, for example,  copies=2
              in  a  preferred  content  expression  lets  content be dropped only when there are
              currently 3 copies of it, including the repo  it's  being  dropped  from.  This  is
              different  than  running  git  annex  drop  --copies=2,  which will drop files that
              currently have 2 copies.

              Matches only files that git-annex believes have the  specified  number  copies,  on
              remotes with the specified trust level. For example, copies=trusted:2

              To  match  any  trust  level  at or higher than a given level, use trustlevel+. For
              example, copies=semitrusted+:2

              Matches only files that git-annex believes have the specified number of copies,  on
              remotes in the specified group. For example, copies=archive:2

              Preferred content expressions have no equivalent to the --in option, but groups can
              accomplish similar things. You can add repositories to groups,  and  match  against
              the groups in a preferred content expression. So rather than --in=usbdrive, put all
              the USB drives into a "transfer" group, and use copies=transfer:1

              Matches only files that git-annex  believes  need  the  specified  number  or  more
              additional copies to be made in order to satisfy their numcopies settings.

              Like  lackingcopies,  but does not look at .gitattributes annex.numcopies settings.
              This makes it significantly faster.

              Matches only files whose content is stored using the specified key-value backend.

              Matches only files  whose  content  is  hashed  using  a  cryptographically  secure

              Matches  only  files that git-annex believes are present in all repositories in the
              specified group.

       smallerthan=size / largerthan=size
              Matches only files whose content is smaller than,  or  larger  than  the  specified

              The  size  can  be specified with any commonly used units, for example, "0.5 gb" or
              "100 KiloBytes"

              Matches only files that have a metadata field attached with a  value  that  matches
              the glob. The values of metadata fields are matched case insensitively.

              To match a tag "done", use metadata=tag=done

              To match author metadata, use metadata=author=*Smith

       metadata=field<number / metadata=field>number

       metadata=field<=number / metadata=field>=number
              Matches  only  files  that  have  a  metadata field attached with a value that is a
              number and is less than or greater than the specified number.

              To match PDFs with between 100 and 200  pages  (assuming  something  has  set  that
              metadata), use metadata=pagecount>=100 and metadata=pagecount<=200

              Makes content be wanted if it's present, but not otherwise.

              This  leaves it up to you to use git-annex manually to move content around. You can
              use this to avoid preferred content settings from  affecting  a  subdirectory.  For
              example: auto/* or (include=ad-hoc/* and present)

              Note that not present is a very bad thing to put in a preferred content expression.
              It'll make it want to get content that's not present,  and  drop  content  that  is
              present! Don't go there..

              Makes  content  be  preferred if it's in a directory (located anywhere in the tree)
              with a particular name.

              The name of the directory can be configured using git  annex  enableremote  $remote

              (If no directory name is configured, it uses "public" by default.)

              git-annex  comes with some built-in preferred content expressions, that can be used
              with repositories that are in some [[preferred content/standard groups/]].

              When a repository is in exactly one such group, you can use the "standard"  keyword
              in  its  preferred  content  expression,  to  match  whatever  content  the group's
              expression matches.

              Most often, the whole preferred content expression is simply "standard".  But,  you
              can do more complicated things, for example: standard or include=otherdir/*

              The  "groupwanted"  keyword  can be used to refer to a preferred content expression
              that is associated with a group. This is like the "standard" keyword, but  you  can
              configure the preferred content expressions using git annex groupwanted.

              Note  that when writing a groupwanted preferred content expression, you can use all
              of the keywords listed above, including "standard".  (But not "groupwanted".)

              For example, to make a variant of the standard client preferred content  expression
              that  does  not  want  files  in  the  "out"  directory,  you  could run: git annex
              groupwanted client "standard and exclude=out/*"

              Then repositories that are in the client group and  have  their  preferred  content
              expression set to "groupwanted" will use that, while other client repositories that
              have their preferred content expression set to "standard"  will  use  the  standard

              Or,  you  could make a new group, with your own custom preferred content expression
              tuned for your needs, and every repository you put  in  this  group  and  make  its
              preferred content be "groupwanted" will use it.

              For  example,  the  archive group only wants to archive 1 copy of each file, spread
              among every repository in the  group.   Here's  how  to  configure  a  group  named
              redundantarchive, that instead wants to contain 3 copies of each file:

               git annex groupwanted redundantarchive "not (copies=redundantarchive:3)"
               for repo in foo bar baz; do
                   git annex group $repo redundantarchive
                   git annex wanted $repo groupwanted

       unused Matches only keys that git annex unused has determined to be unused.

              This  is  related  the the --unused option.  However, putting unused in a preferred
              content expression doesn't make git-annex consider those unused keys. So when  git-
              annex  is  only  checking  preferred  content  expressions  against  files  in  the
              repository (which are obviously used), unused in  a  preferred  content  expression
              won't match anything.

              So when is unused useful in a preferred content expression?

              Using  git  annex  sync --content --all will operate on all files, including unused
              ones, and take unused in preferred content expressions into account.

              The git-annex assistant periodically scans for unused files, and moves them to some
              repository  whose  preferred  content  expression  says  it  wants  them.  (Or,  if
              annex.expireunused is set, it may just delete them.)

              Always matches.

              Never matches. (Same as "not anything")

       not expression
              Inverts what the expression matches. For example, not include=archive/* is the same
              as exclude=archive/*

       and / or / ( expression )
              These can be used to build up more complicated expressions.


       To  check  at the command line which files are matched by a repository's preferred content
       settings, you can use the --want-get and --want-drop options.

       For example, git annex find --want-get --not --in . will find all the files that git annex
       get --auto will want to get, and git annex find --want-drop --in . will find all the files
       that git annex drop --auto will want to drop.







       Joey Hess <>