e06feb7316
Importing from a special remote honors its preferred content too; unwanted files are not imported. But, some preferred content expressions can't be checked before files are imported, and trying to import with such an expression will fail. Tested this with scenarios including changing the preferred content expression and making sure merging the import didn't delete files that were no longer wanted. There was one minor inefficiency mentioned in the todo that I punted on.
148 lines
5.2 KiB
Markdown
148 lines
5.2 KiB
Markdown
# NAME
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git-annex export - export content to a remote
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# SYNOPSIS
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git annex export `treeish --to remote`
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# DESCRIPTION
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Use this command to export a tree of files from a git-annex repository.
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Normally files are stored on a git-annex special remote named by their
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keys. That is great for reliable data storage, but your filenames are
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obscured. Exporting replicates the tree to the special remote as-is.
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Mixing key/value storage and exports in the same remote would be a mess and
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so is not allowed. You have to configure a special remote with
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`exporttree=yes` when initially setting it up with
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[[git-annex-initremote]](1).
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The treeish to export can be the name of a git branch, or a tag, or any
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other treeish accepted by git, including eg master:subdir to only export a
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subdirectory from a branch.
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When the remote has a preferred content setting, the treeish is filtered
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through it, excluding files it does not want from being exported to it.
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Repeated exports are done efficiently, by diffing the old and new tree,
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and transferring only the changed files, and renaming files as necessary.
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Exports can be interrupted and resumed. However, partially uploaded files
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will be re-started from the beginning in most cases.
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Once content has been exported to a remote, commands like `git annex get`
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can download content from there the same as from other remotes. However,
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since an export is not a key/value store, git-annex has to do more
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verification of content downloaded from an export. Some types of keys,
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that are not based on checksums, cannot be downloaded from an export.
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And, git-annex will never trust an export to retain the content of a key.
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However, some special remotes, notably S3, support keeping track of old
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versions of files stored in them. If a special remote is set up to do
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that, it can be used as a key/value store and the limitations in the above
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paragraph do not apply. Note that dropping content from such a remote is
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not supported. See individual special remotes' documentation for
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details of how to enable such versioning.
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The `git annex sync --content` command (and the git-annex assistant)
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can also be used to export a branch to a special remote,
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updating the special remote whenever the branch is changed.
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To do this, you need to configure "remote.<name>.annex-tracking-branch"
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to tell it what branch to track.
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For example:
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git config remote.myremote.annex-tracking-branch master
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git annex sync --content
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You can combine using `git annex export` to send changes to a special
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remote with `git annex import` to fetch changes from a special remote.
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When a file on a special remote has been modified by software other than
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git-annex, exporting to it will not overwrite the modified file, and the
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export will not succeed. You can resolve this conflict by using
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`git annex import`.
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(Some types of special remotes such as S3 with versioning may instead
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let an export overwrite the modified file; then `git annex import`
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will create a sequence of commits that includes the modified file,
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so the overwritten modification is not lost.)
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# OPTIONS
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* `--to=remote`
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Specify the special remote to export to.
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* `--tracking`
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This is a deprecated way to set "remote.<name>.annex-tracking-branch".
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Instead of using this option, you should just set the git configuration
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yourself.
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* `--fast`
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This sets up an export of a tree, but avoids any expensive file uploads to
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the remote. You can later run `git annex sync --content` to upload
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the files to the export.
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# EXAMPLE
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git annex initremote myremote type=directory directory=/mnt/myremote \
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exporttree=yes encryption=none
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git annex export master --to myremote
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After that, /mnt/myremote will contain the same tree of files as the master
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branch does.
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git mv myfile subdir/myfile
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git commit -m renamed
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git annex export master --to myremote
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That updates /mnt/myremote to reflect the renamed file.
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git annex export master:subdir --to myremote
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That updates /mnt/myremote, to contain only the files in the "subdir"
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directory of the master branch.
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# EXPORT CONFLICTS
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If two different git-annex repositories are both exporting different trees
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to the same special remote, it's possible for an export conflict to occur.
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This leaves the special remote with some files from one tree, and some
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files from the other. Files in the special remote may have entirely the
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wrong content as well.
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It's not possible for git-annex to detect when making an export will result
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in an export conflict. The best way to avoid export conflicts is to either
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only ever export to a special remote from a single repository, or to have a
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rule about the tree that you export to the special remote. For example, if
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you always export origin/master after pushing to origin, then an export
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conflict can't happen.
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An export conflict can only be detected after the two git repositories
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that produced it get back in sync. Then the next time you run `git annex
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export`, it will detect the export conflict, and resolve it.
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# SEE ALSO
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[[git-annex]](1)
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[[git-annex-initremote]](1)
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[[git-annex-import]](1)
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[[git-annex-sync]](1)
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[[git-annex-preferred-content]](1)
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# HISTORY
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The `export` command was introduced in git-annex version 6.20170925.
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# AUTHOR
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Joey Hess <id@joeyh.name>
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Warning: Automatically converted into a man page by mdwn2man. Edit with care.
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