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79559f27be
When using git fast-export and git fast-import to rewrite the history of a repository with large binary files, almost all of the time is spent dealing with blobs. This is extremely inefficient if all we want to do is rewrite the commits and tree structure. --no-data skips the output of blobs and writes SHA-1s instead of marks, which provides a massive speedup. Signed-off-by: Geoffrey Irving <irving@naml.us> Signed-off-by: Junio C Hamano <gitster@pobox.com>
144 lines
4.8 KiB
Plaintext
144 lines
4.8 KiB
Plaintext
git-fast-export(1)
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==================
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NAME
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----
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git-fast-export - Git data exporter
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SYNOPSIS
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--------
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'git fast-export [options]' | 'git fast-import'
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DESCRIPTION
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-----------
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This program dumps the given revisions in a form suitable to be piped
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into 'git-fast-import'.
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You can use it as a human-readable bundle replacement (see
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linkgit:git-bundle[1]), or as a kind of an interactive
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'git-filter-branch'.
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OPTIONS
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-------
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--progress=<n>::
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Insert 'progress' statements every <n> objects, to be shown by
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'git-fast-import' during import.
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--signed-tags=(verbatim|warn|strip|abort)::
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Specify how to handle signed tags. Since any transformation
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after the export can change the tag names (which can also happen
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when excluding revisions) the signatures will not match.
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+
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When asking to 'abort' (which is the default), this program will die
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when encountering a signed tag. With 'strip', the tags will be made
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unsigned, with 'verbatim', they will be silently exported
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and with 'warn', they will be exported, but you will see a warning.
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--tag-of-filtered-object=(abort|drop|rewrite)::
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Specify how to handle tags whose tagged objectis filtered out.
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Since revisions and files to export can be limited by path,
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tagged objects may be filtered completely.
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+
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When asking to 'abort' (which is the default), this program will die
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when encountering such a tag. With 'drop' it will omit such tags from
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the output. With 'rewrite', if the tagged object is a commit, it will
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rewrite the tag to tag an ancestor commit (via parent rewriting; see
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linkgit:git-rev-list[1])
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-M::
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-C::
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Perform move and/or copy detection, as described in the
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linkgit:git-diff[1] manual page, and use it to generate
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rename and copy commands in the output dump.
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+
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Note that earlier versions of this command did not complain and
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produced incorrect results if you gave these options.
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--export-marks=<file>::
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Dumps the internal marks table to <file> when complete.
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Marks are written one per line as `:markid SHA-1`. Only marks
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for revisions are dumped; marks for blobs are ignored.
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Backends can use this file to validate imports after they
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have been completed, or to save the marks table across
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incremental runs. As <file> is only opened and truncated
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at completion, the same path can also be safely given to
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\--import-marks.
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--import-marks=<file>::
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Before processing any input, load the marks specified in
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<file>. The input file must exist, must be readable, and
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must use the same format as produced by \--export-marks.
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+
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Any commits that have already been marked will not be exported again.
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If the backend uses a similar \--import-marks file, this allows for
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incremental bidirectional exporting of the repository by keeping the
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marks the same across runs.
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--fake-missing-tagger::
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Some old repositories have tags without a tagger. The
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fast-import protocol was pretty strict about that, and did not
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allow that. So fake a tagger to be able to fast-import the
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output.
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--no-data::
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Skip output of blob objects and instead refer to blobs via
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their original SHA-1 hash. This is useful when rewriting the
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directory structure or history of a repository without
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touching the contents of individual files. Note that the
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resulting stream can only be used by a repository which
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already contains the necessary objects.
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[git-rev-list-args...]::
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A list of arguments, acceptable to 'git-rev-parse' and
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'git-rev-list', that specifies the specific objects and references
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to export. For example, `master\~10..master` causes the
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current master reference to be exported along with all objects
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added since its 10th ancestor commit.
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EXAMPLES
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--------
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-------------------------------------------------------------------
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$ git fast-export --all | (cd /empty/repository && git fast-import)
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-------------------------------------------------------------------
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This will export the whole repository and import it into the existing
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empty repository. Except for reencoding commits that are not in
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UTF-8, it would be a one-to-one mirror.
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-----------------------------------------------------
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$ git fast-export master~5..master |
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sed "s|refs/heads/master|refs/heads/other|" |
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git fast-import
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-----------------------------------------------------
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This makes a new branch called 'other' from 'master~5..master'
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(i.e. if 'master' has linear history, it will take the last 5 commits).
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Note that this assumes that none of the blobs and commit messages
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referenced by that revision range contains the string
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'refs/heads/master'.
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Limitations
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-----------
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Since 'git-fast-import' cannot tag trees, you will not be
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able to export the linux-2.6.git repository completely, as it contains
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a tag referencing a tree instead of a commit.
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Author
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------
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Written by Johannes E. Schindelin <johannes.schindelin@gmx.de>.
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Documentation
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--------------
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Documentation by Johannes E. Schindelin <johannes.schindelin@gmx.de>.
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GIT
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---
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Part of the linkgit:git[1] suite
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