Documentation/git-svn.txt - jrn/git - Git at Google

 git-svn(1)
 ==========

 NAME
 ----
 git-svn - bidirectional operation between a single Subversion branch and git

 SYNOPSIS
 --------
 'git-svn' <command> [options] [arguments]

 DESCRIPTION
 -----------
 git-svn is a simple conduit for changesets between a single Subversion
 branch and git. It is not to be confused with gitlink:git-svnimport[1].
 They were designed with very different goals in mind.

 git-svn is designed for an individual developer who wants a
 bidirectional flow of changesets between a single branch in Subversion
 and an arbitrary number of branches in git.  git-svnimport is designed
 for read-only operation on repositories that match a particular layout
 (albeit the recommended one by SVN developers).

 For importing svn, git-svnimport is potentially more powerful when
 operating on repositories organized under the recommended
 trunk/branch/tags structure, and should be faster, too.

 git-svn mostly ignores the very limited view of branching that
 Subversion has.  This allows git-svn to be much easier to use,
 especially on repositories that are not organized in a manner that
 git-svnimport is designed for.

 COMMANDS
 --------
 --

 'init'::
 	Creates an empty git repository with additional metadata
 	directories for git-svn.  The Subversion URL must be specified
 	as a command-line argument.  Optionally, the target directory
 	to operate on can be specified as a second argument.  Normally
 	this command initializes the current directory.

 'fetch'::

 Fetch unfetched revisions from the Subversion URL we are
 tracking.  refs/remotes/git-svn will be updated to the
 latest revision.

 Note: You should never attempt to modify the remotes/git-svn
 branch outside of git-svn.  Instead, create a branch from
 remotes/git-svn and work on that branch.  Use the 'commit'
 command (see below) to write git commits back to
 remotes/git-svn.

 See '<<fetch-args,Additional Fetch Arguments>>' if you are interested in
 manually joining branches on commit.

 'dcommit'::
 	Commit all diffs from the current HEAD directly to the SVN
 	repository, and then rebase or reset (depending on whether or
 	not there is a diff between SVN and HEAD).  It is recommended
 	that you run git-svn fetch and rebase (not pull) your commits
 	against the latest changes in the SVN repository.
 	This is advantageous over 'commit' (below) because it produces
 	cleaner, more linear history.

 'log'::
 	This should make it easy to look up svn log messages when svn
 	users refer to -r/--revision numbers.

 	The following features from `svn log' are supported:

 	--revision=<n>[:<n>] - is supported, non-numeric args are not:
 	                       HEAD, NEXT, BASE, PREV, etc ...
 	-v/--verbose         - it's not completely compatible with
 	                       the --verbose output in svn log, but
 			       reasonably close.
 	--limit=<n>          - is NOT the same as --max-count,
 	                       doesn't count merged/excluded commits
 	--incremental        - supported

 	New features:

 	--show-commit        - shows the git commit sha1, as well
 	--oneline            - our version of --pretty=oneline

 	Any other arguments are passed directly to `git log'

 'commit'::
 	You should consider using 'dcommit' instead of this command.
 	Commit specified commit or tree objects to SVN.  This relies on
 	your imported fetch data being up-to-date.  This makes
 	absolutely no attempts to do patching when committing to SVN, it
 	simply overwrites files with those specified in the tree or
 	commit.  All merging is assumed to have taken place
 	independently of git-svn functions.

 'rebuild'::
 	Not a part of daily usage, but this is a useful command if
 	you've just cloned a repository (using gitlink:git-clone[1]) that was
 	tracked with git-svn.  Unfortunately, git-clone does not clone
 	git-svn metadata and the svn working tree that git-svn uses for
 	its operations.  This rebuilds the metadata so git-svn can
 	resume fetch operations.  A Subversion URL may be optionally
 	specified at the command-line if the directory/repository you're
 	tracking has moved or changed protocols.

 'show-ignore'::
 	Recursively finds and lists the svn:ignore property on
 	directories.  The output is suitable for appending to
 	the $GIT_DIR/info/exclude file.

 'commit-diff'::
 	Commits the diff of two tree-ish arguments from the
 	command-line.  This command is intended for interopability with
 	git-svnimport and does not rely on being inside an git-svn
 	init-ed repository.  This command takes three arguments, (a) the
 	original tree to diff against, (b) the new tree result, (c) the
 	URL of the target Subversion repository.  The final argument
 	(URL) may be omitted if you are working from a git-svn-aware
 	repository (that has been init-ed with git-svn).

 'graft-branches'::
 	This command attempts to detect merges/branches from already
 	imported history.  Techniques used currently include regexes,
 	file copies, and tree-matches).  This command generates (or
 	modifies) the $GIT_DIR/info/grafts file.  This command is
 	considered experimental, and inherently flawed because
 	merge-tracking in SVN is inherently flawed and inconsistent
 	across different repositories.

 'multi-init'::
 	This command supports git-svnimport-like command-line syntax for
 	importing repositories that are layed out as recommended by the
 	SVN folks.  This is a bit more tolerant than the git-svnimport
 	command-line syntax and doesn't require the user to figure out
 	where the repository URL ends and where the repository path
 	begins.

 'multi-fetch'::
 	This runs fetch on all known SVN branches we're tracking.  This
 	will NOT discover new branches (unlike git-svnimport), so
 	multi-init will need to be re-run (it's idempotent).

 --

 OPTIONS
 -------
 --

 --shared::
 --template=<template_directory>::
 	Only used with the 'init' command.
 	These are passed directly to gitlink:git-init-db[1].

 -r <ARG>::
 --revision <ARG>::

 Only used with the 'fetch' command.

 Takes any valid -r<argument> svn would accept and passes it
 directly to svn. -r<ARG1>:<ARG2> ranges and "{" DATE "}" syntax
 is also supported.  This is passed directly to svn, see svn
 documentation for more details.

 This can allow you to make partial mirrors when running fetch.

 -::
 --stdin::

 Only used with the 'commit' command.

 Read a list of commits from stdin and commit them in reverse
 order.  Only the leading sha1 is read from each line, so
 git-rev-list --pretty=oneline output can be used.

 --rmdir::

 Only used with the 'dcommit', 'commit' and 'commit-diff' commands.

 Remove directories from the SVN tree if there are no files left
 behind.  SVN can version empty directories, and they are not
 removed by default if there are no files left in them.  git
 cannot version empty directories.  Enabling this flag will make
 the commit to SVN act like git.

 repo-config key: svn.rmdir

 -e::
 --edit::

 Only used with the 'dcommit', 'commit' and 'commit-diff' commands.

 Edit the commit message before committing to SVN.  This is off by
 default for objects that are commits, and forced on when committing
 tree objects.

 repo-config key: svn.edit

 -l<num>::
 --find-copies-harder::

 Only used with the 'dcommit', 'commit' and 'commit-diff' commands.

 They are both passed directly to git-diff-tree see
 gitlink:git-diff-tree[1] for more information.

 [verse]
 repo-config key: svn.l
 repo-config key: svn.findcopiesharder

 -A<filename>::
 --authors-file=<filename>::

 Syntax is compatible with the files used by git-svnimport and
 git-cvsimport:

 ------------------------------------------------------------------------
 	loginname = Joe User <user@example.com>
 ------------------------------------------------------------------------

 If this option is specified and git-svn encounters an SVN
 committer name that does not exist in the authors-file, git-svn
 will abort operation. The user will then have to add the
 appropriate entry.  Re-running the previous git-svn command
 after the authors-file is modified should continue operation.

 repo-config key: svn.authorsfile

 -q::
 --quiet::
 	Make git-svn less verbose.  This only affects git-svn if you
 	have the SVN::* libraries installed and are using them.

 --repack[=<n>]::
 --repack-flags=<flags>
 	These should help keep disk usage sane for large fetches
 	with many revisions.

 	--repack takes an optional argument for the number of revisions
 	to fetch before repacking.  This defaults to repacking every
 	1000 commits fetched if no argument is specified.

 	--repack-flags are passed directly to gitlink:git-repack[1].

 repo-config key: svn.repack
 repo-config key: svn.repackflags

 -m::
 --merge::
 -s<strategy>::
 --strategy=<strategy>::

 These are only used with the 'dcommit' command.

 Passed directly to git-rebase when using 'dcommit' if a
 'git-reset' cannot be used (see dcommit).

 -n::
 --dry-run::

 This is only used with the 'dcommit' command.

 Print out the series of git arguments that would show
 which diffs would be committed to SVN.

 --

 ADVANCED OPTIONS
 ----------------
 --

 -b<refname>::
 --branch <refname>::
 Used with 'fetch' or 'commit'.

 This can be used to join arbitrary git branches to remotes/git-svn
 on new commits where the tree object is equivalent.

 When used with different GIT_SVN_ID values, tags and branches in
 SVN can be tracked this way, as can some merges where the heads
 end up having completely equivalent content.  This can even be
 used to track branches across multiple SVN _repositories_.

 This option may be specified multiple times, once for each
 branch.

 repo-config key: svn.branch

 -i<GIT_SVN_ID>::
 --id <GIT_SVN_ID>::

 This sets GIT_SVN_ID (instead of using the environment).  See the
 section on
 '<<tracking-multiple-repos,Tracking Multiple Repositories or Branches>>'
 for more information on using GIT_SVN_ID.

 --follow-parent::
 	This is especially helpful when we're tracking a directory
 	that has been moved around within the repository, or if we
 	started tracking a branch and never tracked the trunk it was
 	descended from.

 	This relies on the SVN::* libraries to work.

 repo-config key: svn.followparent

 --no-metadata::
 	This gets rid of the git-svn-id: lines at the end of every commit.

 	With this, you lose the ability to use the rebuild command.  If
 	you ever lose your .git/svn/git-svn/.rev_db file, you won't be
 	able to fetch again, either.  This is fine for one-shot imports.

 	The 'git-svn log' command will not work on repositories using this,
 	either.

 repo-config key: svn.nometadata

 --

 COMPATIBILITY OPTIONS
 ---------------------
 --

 --upgrade::
 Only used with the 'rebuild' command.

 Run this if you used an old version of git-svn that used
 "git-svn-HEAD" instead of "remotes/git-svn" as the branch
 for tracking the remote.

 --no-ignore-externals::
 Only used with the 'fetch' and 'rebuild' command.

 This command has no effect when you are using the SVN::*
 libraries with git, svn:externals are always avoided.

 By default, git-svn passes --ignore-externals to svn to avoid
 fetching svn:external trees into git.  Pass this flag to enable
 externals tracking directly via git.

 Versions of svn that do not support --ignore-externals are
 automatically detected and this flag will be automatically
 enabled for them.

 Otherwise, do not enable this flag unless you know what you're
 doing.

 repo-config key: svn.noignoreexternals

 --ignore-nodate::
 Only used with the 'fetch' command.

 By default git-svn will crash if it tries to import a revision
 from SVN which has '(no date)' listed as the date of the revision.
 This is repository corruption on SVN's part, plain and simple.
 But sometimes you really need those revisions anyway.

 If supplied git-svn will convert '(no date)' entries to the UNIX
 epoch (midnight on Jan. 1, 1970).  Yes, that's probably very wrong.
 SVN was very wrong.

 --

 Basic Examples
 ~~~~~~~~~~~~~~

 Tracking and contributing to an Subversion managed-project:

 ------------------------------------------------------------------------
 # Initialize a repo (like git init-db):
 	git-svn init http://svn.foo.org/project/trunk
 # Fetch remote revisions:
 	git-svn fetch
 # Create your own branch to hack on:
 	git checkout -b my-branch remotes/git-svn
 # Commit only the git commits you want to SVN:
 	git-svn commit <tree-ish> [<tree-ish_2> ...]
 # Commit all the git commits from my-branch that don't exist in SVN:
 	git-svn commit remotes/git-svn..my-branch
 # Something is committed to SVN, rebase the latest into your branch:
 	git-svn fetch && git rebase remotes/git-svn
 # Append svn:ignore settings to the default git exclude file:
 	git-svn show-ignore >> .git/info/exclude
 ------------------------------------------------------------------------

 REBASE VS. PULL
 ---------------

 Originally, git-svn recommended that the remotes/git-svn branch be
 pulled from.  This is because the author favored 'git-svn commit B'
 to commit a single head rather than the 'git-svn commit A..B' notation
 to commit multiple commits.

 If you use 'git-svn commit A..B' to commit several diffs and you do not
 have the latest remotes/git-svn merged into my-branch, you should use
 'git rebase' to update your work branch instead of 'git pull'.  'pull'
 can cause non-linear history to be flattened when committing into SVN,
 which can lead to merge commits reversing previous commits in SVN.

 DESIGN PHILOSOPHY
 -----------------
 Merge tracking in Subversion is lacking and doing branched development
 with Subversion is cumbersome as a result.  git-svn completely forgoes
 any automated merge/branch tracking on the Subversion side and leaves it
 entirely up to the user on the git side.  It's simply not worth it to do
 a useful translation when the original signal is weak.

 [[tracking-multiple-repos]]
 TRACKING MULTIPLE REPOSITORIES OR BRANCHES
 ------------------------------------------
 This is for advanced users, most users should ignore this section.

 Because git-svn does not care about relationships between different
 branches or directories in a Subversion repository, git-svn has a simple
 hack to allow it to track an arbitrary number of related _or_ unrelated
 SVN repositories via one git repository.  Simply set the GIT_SVN_ID
 environment variable to a name other other than "git-svn" (the default)
 and git-svn will ignore the contents of the $GIT_DIR/svn/git-svn directory
 and instead do all of its work in $GIT_DIR/svn/$GIT_SVN_ID for that
 invocation.  The interface branch will be remotes/$GIT_SVN_ID, instead of
 remotes/git-svn.  Any remotes/$GIT_SVN_ID branch should never be modified
 by the user outside of git-svn commands.

 [[fetch-args]]
 ADDITIONAL FETCH ARGUMENTS
 --------------------------
 This is for advanced users, most users should ignore this section.

 Unfetched SVN revisions may be imported as children of existing commits
 by specifying additional arguments to 'fetch'.  Additional parents may
 optionally be specified in the form of sha1 hex sums at the
 command-line.  Unfetched SVN revisions may also be tied to particular
 git commits with the following syntax:

 ------------------------------------------------
 	svn_revision_number=git_commit_sha1
 ------------------------------------------------

 This allows you to tie unfetched SVN revision 375 to your current HEAD:

 ------------------------------------------------
 	git-svn fetch 375=$(git-rev-parse HEAD)
 ------------------------------------------------

 Advanced Example: Tracking a Reorganized Repository
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Note: this example is now obsolete if you have SVN::* libraries
 installed.  Simply use --follow-parent when fetching.

 If you're tracking a directory that has moved, or otherwise been
 branched or tagged off of another directory in the repository and you
 care about the full history of the project, then you can read this
 section.

 This is how Yann Dirson tracked the trunk of the ufoai directory when
 the /trunk directory of his repository was moved to /ufoai/trunk and
 he needed to continue tracking /ufoai/trunk where /trunk left off.

 ------------------------------------------------------------------------
 	# This log message shows when the repository was reorganized:
 	r166 | ydirson | 2006-03-02 01:36:55 +0100 (Thu, 02 Mar 2006) | 1 line
 	Changed paths:
 	   D /trunk
 	   A /ufoai/trunk (from /trunk:165)

 	# First we start tracking the old revisions:
 	GIT_SVN_ID=git-oldsvn git-svn init \
 			https://svn.sourceforge.net/svnroot/ufoai/trunk
 	GIT_SVN_ID=git-oldsvn git-svn fetch -r1:165

 	# And now, we continue tracking the new revisions:
 	GIT_SVN_ID=git-newsvn git-svn init \
 	      https://svn.sourceforge.net/svnroot/ufoai/ufoai/trunk
 	GIT_SVN_ID=git-newsvn git-svn fetch \
 	      166=`git-rev-parse refs/remotes/git-oldsvn`
 ------------------------------------------------------------------------

 BUGS
 ----

 If you are not using the SVN::* Perl libraries and somebody commits a
 conflicting changeset to SVN at a bad moment (right before you commit)
 causing a conflict and your commit to fail, your svn working tree
 ($GIT_DIR/git-svn/tree) may be dirtied.  The easiest thing to do is
 probably just to rm -rf $GIT_DIR/git-svn/tree and run 'rebuild'.

 We ignore all SVN properties except svn:executable.  Too difficult to
 map them since we rely heavily on git write-tree being _exactly_ the
 same on both the SVN and git working trees and I prefer not to clutter
 working trees with metadata files.

 Renamed and copied directories are not detected by git and hence not
 tracked when committing to SVN.  I do not plan on adding support for
 this as it's quite difficult and time-consuming to get working for all
 the possible corner cases (git doesn't do it, either).  Renamed and
 copied files are fully supported if they're similar enough for git to
 detect them.

 SEE ALSO
 --------
 gitlink:git-rebase[1]

 Author
 ------
 Written by Eric Wong <normalperson@yhbt.net>.

 Documentation
 -------------
 Written by Eric Wong <normalperson@yhbt.net>.
	git-svn(1)
	==========

	NAME
	----
	git-svn - bidirectional operation between a single Subversion branch and git

	SYNOPSIS
	--------
	'git-svn' <command> [options] [arguments]

	DESCRIPTION
	-----------
	git-svn is a simple conduit for changesets between a single Subversion
	branch and git. It is not to be confused with gitlink:git-svnimport[1].
	They were designed with very different goals in mind.

	git-svn is designed for an individual developer who wants a
	bidirectional flow of changesets between a single branch in Subversion
	and an arbitrary number of branches in git. git-svnimport is designed
	for read-only operation on repositories that match a particular layout
	(albeit the recommended one by SVN developers).

	For importing svn, git-svnimport is potentially more powerful when
	operating on repositories organized under the recommended
	trunk/branch/tags structure, and should be faster, too.

	git-svn mostly ignores the very limited view of branching that
	Subversion has. This allows git-svn to be much easier to use,
	especially on repositories that are not organized in a manner that
	git-svnimport is designed for.

	COMMANDS
	--------
	--

	'init'::
	Creates an empty git repository with additional metadata
	directories for git-svn. The Subversion URL must be specified
	as a command-line argument. Optionally, the target directory
	to operate on can be specified as a second argument. Normally
	this command initializes the current directory.

	'fetch'::

	Fetch unfetched revisions from the Subversion URL we are
	tracking. refs/remotes/git-svn will be updated to the
	latest revision.

	Note: You should never attempt to modify the remotes/git-svn
	branch outside of git-svn. Instead, create a branch from
	remotes/git-svn and work on that branch. Use the 'commit'
	command (see below) to write git commits back to
	remotes/git-svn.

	See '<<fetch-args,Additional Fetch Arguments>>' if you are interested in
	manually joining branches on commit.

	'dcommit'::
	Commit all diffs from the current HEAD directly to the SVN
	repository, and then rebase or reset (depending on whether or
	not there is a diff between SVN and HEAD). It is recommended
	that you run git-svn fetch and rebase (not pull) your commits
	against the latest changes in the SVN repository.
	This is advantageous over 'commit' (below) because it produces
	cleaner, more linear history.

	'log'::
	This should make it easy to look up svn log messages when svn
	users refer to -r/--revision numbers.

	The following features from `svn log' are supported:

	--revision=<n>[:<n>] - is supported, non-numeric args are not:
	HEAD, NEXT, BASE, PREV, etc ...
	-v/--verbose - it's not completely compatible with
	the --verbose output in svn log, but
	reasonably close.
	--limit=<n> - is NOT the same as --max-count,
	doesn't count merged/excluded commits
	--incremental - supported

	New features:

	--show-commit - shows the git commit sha1, as well
	--oneline - our version of --pretty=oneline

	Any other arguments are passed directly to `git log'

	'commit'::
	You should consider using 'dcommit' instead of this command.
	Commit specified commit or tree objects to SVN. This relies on
	your imported fetch data being up-to-date. This makes
	absolutely no attempts to do patching when committing to SVN, it
	simply overwrites files with those specified in the tree or
	commit. All merging is assumed to have taken place
	independently of git-svn functions.

	'rebuild'::
	Not a part of daily usage, but this is a useful command if
	you've just cloned a repository (using gitlink:git-clone[1]) that was
	tracked with git-svn. Unfortunately, git-clone does not clone
	git-svn metadata and the svn working tree that git-svn uses for
	its operations. This rebuilds the metadata so git-svn can
	resume fetch operations. A Subversion URL may be optionally
	specified at the command-line if the directory/repository you're
	tracking has moved or changed protocols.

	'show-ignore'::
	Recursively finds and lists the svn:ignore property on
	directories. The output is suitable for appending to
	the $GIT_DIR/info/exclude file.

	'commit-diff'::
	Commits the diff of two tree-ish arguments from the
	command-line. This command is intended for interopability with
	git-svnimport and does not rely on being inside an git-svn
	init-ed repository. This command takes three arguments, (a) the
	original tree to diff against, (b) the new tree result, (c) the
	URL of the target Subversion repository. The final argument
	(URL) may be omitted if you are working from a git-svn-aware
	repository (that has been init-ed with git-svn).

	'graft-branches'::
	This command attempts to detect merges/branches from already
	imported history. Techniques used currently include regexes,
	file copies, and tree-matches). This command generates (or
	modifies) the $GIT_DIR/info/grafts file. This command is
	considered experimental, and inherently flawed because
	merge-tracking in SVN is inherently flawed and inconsistent
	across different repositories.

	'multi-init'::
	This command supports git-svnimport-like command-line syntax for
	importing repositories that are layed out as recommended by the
	SVN folks. This is a bit more tolerant than the git-svnimport
	command-line syntax and doesn't require the user to figure out
	where the repository URL ends and where the repository path
	begins.

	'multi-fetch'::
	This runs fetch on all known SVN branches we're tracking. This
	will NOT discover new branches (unlike git-svnimport), so
	multi-init will need to be re-run (it's idempotent).

	--

	OPTIONS
	-------
	--

	--shared::
	--template=<template_directory>::
	Only used with the 'init' command.
	These are passed directly to gitlink:git-init-db[1].

	-r <ARG>::
	--revision <ARG>::

	Only used with the 'fetch' command.

	Takes any valid -r<argument> svn would accept and passes it
	directly to svn. -r<ARG1>:<ARG2> ranges and "{" DATE "}" syntax
	is also supported. This is passed directly to svn, see svn
	documentation for more details.

	This can allow you to make partial mirrors when running fetch.

	-::
	--stdin::

	Only used with the 'commit' command.

	Read a list of commits from stdin and commit them in reverse
	order. Only the leading sha1 is read from each line, so
	git-rev-list --pretty=oneline output can be used.

	--rmdir::

	Only used with the 'dcommit', 'commit' and 'commit-diff' commands.

	Remove directories from the SVN tree if there are no files left
	behind. SVN can version empty directories, and they are not
	removed by default if there are no files left in them. git
	cannot version empty directories. Enabling this flag will make
	the commit to SVN act like git.

	repo-config key: svn.rmdir

	-e::
	--edit::

	Only used with the 'dcommit', 'commit' and 'commit-diff' commands.

	Edit the commit message before committing to SVN. This is off by
	default for objects that are commits, and forced on when committing
	tree objects.

	repo-config key: svn.edit

	-l<num>::
	--find-copies-harder::

	Only used with the 'dcommit', 'commit' and 'commit-diff' commands.

	They are both passed directly to git-diff-tree see
	gitlink:git-diff-tree[1] for more information.

	[verse]
	repo-config key: svn.l
	repo-config key: svn.findcopiesharder

	-A<filename>::
	--authors-file=<filename>::

	Syntax is compatible with the files used by git-svnimport and
	git-cvsimport:

	------------------------------------------------------------------------
	loginname = Joe User <user@example.com>
	------------------------------------------------------------------------

	If this option is specified and git-svn encounters an SVN
	committer name that does not exist in the authors-file, git-svn
	will abort operation. The user will then have to add the
	appropriate entry. Re-running the previous git-svn command
	after the authors-file is modified should continue operation.

	repo-config key: svn.authorsfile

	-q::
	--quiet::
	Make git-svn less verbose. This only affects git-svn if you
	have the SVN::* libraries installed and are using them.

	--repack[=<n>]::
	--repack-flags=<flags>
	These should help keep disk usage sane for large fetches
	with many revisions.

	--repack takes an optional argument for the number of revisions
	to fetch before repacking. This defaults to repacking every
	1000 commits fetched if no argument is specified.

	--repack-flags are passed directly to gitlink:git-repack[1].

	repo-config key: svn.repack
	repo-config key: svn.repackflags

	-m::
	--merge::
	-s<strategy>::
	--strategy=<strategy>::

	These are only used with the 'dcommit' command.

	Passed directly to git-rebase when using 'dcommit' if a
	'git-reset' cannot be used (see dcommit).

	-n::
	--dry-run::

	This is only used with the 'dcommit' command.

	Print out the series of git arguments that would show
	which diffs would be committed to SVN.

	--

	ADVANCED OPTIONS
	----------------
	--

	-b<refname>::
	--branch <refname>::
	Used with 'fetch' or 'commit'.

	This can be used to join arbitrary git branches to remotes/git-svn
	on new commits where the tree object is equivalent.

	When used with different GIT_SVN_ID values, tags and branches in
	SVN can be tracked this way, as can some merges where the heads
	end up having completely equivalent content. This can even be
	used to track branches across multiple SVN _repositories_.

	This option may be specified multiple times, once for each
	branch.

	repo-config key: svn.branch

	-i<GIT_SVN_ID>::
	--id <GIT_SVN_ID>::

	This sets GIT_SVN_ID (instead of using the environment). See the
	section on
	'<<tracking-multiple-repos,Tracking Multiple Repositories or Branches>>'
	for more information on using GIT_SVN_ID.

	--follow-parent::
	This is especially helpful when we're tracking a directory
	that has been moved around within the repository, or if we
	started tracking a branch and never tracked the trunk it was
	descended from.

	This relies on the SVN::* libraries to work.

	repo-config key: svn.followparent

	--no-metadata::
	This gets rid of the git-svn-id: lines at the end of every commit.

	With this, you lose the ability to use the rebuild command. If
	you ever lose your .git/svn/git-svn/.rev_db file, you won't be
	able to fetch again, either. This is fine for one-shot imports.

	The 'git-svn log' command will not work on repositories using this,
	either.

	repo-config key: svn.nometadata

	--

	COMPATIBILITY OPTIONS
	---------------------
	--

	--upgrade::
	Only used with the 'rebuild' command.

	Run this if you used an old version of git-svn that used
	"git-svn-HEAD" instead of "remotes/git-svn" as the branch
	for tracking the remote.

	--no-ignore-externals::
	Only used with the 'fetch' and 'rebuild' command.

	This command has no effect when you are using the SVN::*
	libraries with git, svn:externals are always avoided.

	By default, git-svn passes --ignore-externals to svn to avoid
	fetching svn:external trees into git. Pass this flag to enable
	externals tracking directly via git.

	Versions of svn that do not support --ignore-externals are
	automatically detected and this flag will be automatically
	enabled for them.

	Otherwise, do not enable this flag unless you know what you're
	doing.

	repo-config key: svn.noignoreexternals

	--ignore-nodate::
	Only used with the 'fetch' command.

	By default git-svn will crash if it tries to import a revision
	from SVN which has '(no date)' listed as the date of the revision.
	This is repository corruption on SVN's part, plain and simple.
	But sometimes you really need those revisions anyway.

	If supplied git-svn will convert '(no date)' entries to the UNIX
	epoch (midnight on Jan. 1, 1970). Yes, that's probably very wrong.
	SVN was very wrong.

	--

	Basic Examples
	~~~~~~~~~~~~~~

	Tracking and contributing to an Subversion managed-project:

	------------------------------------------------------------------------
	# Initialize a repo (like git init-db):
	git-svn init http://svn.foo.org/project/trunk
	# Fetch remote revisions:
	git-svn fetch
	# Create your own branch to hack on:
	git checkout -b my-branch remotes/git-svn
	# Commit only the git commits you want to SVN:
	git-svn commit <tree-ish> [<tree-ish_2> ...]
	# Commit all the git commits from my-branch that don't exist in SVN:
	git-svn commit remotes/git-svn..my-branch
	# Something is committed to SVN, rebase the latest into your branch:
	git-svn fetch && git rebase remotes/git-svn
	# Append svn:ignore settings to the default git exclude file:
	git-svn show-ignore >> .git/info/exclude
	------------------------------------------------------------------------

	REBASE VS. PULL
	---------------

	Originally, git-svn recommended that the remotes/git-svn branch be
	pulled from. This is because the author favored 'git-svn commit B'
	to commit a single head rather than the 'git-svn commit A..B' notation
	to commit multiple commits.

	If you use 'git-svn commit A..B' to commit several diffs and you do not
	have the latest remotes/git-svn merged into my-branch, you should use
	'git rebase' to update your work branch instead of 'git pull'. 'pull'
	can cause non-linear history to be flattened when committing into SVN,
	which can lead to merge commits reversing previous commits in SVN.

	DESIGN PHILOSOPHY
	-----------------
	Merge tracking in Subversion is lacking and doing branched development
	with Subversion is cumbersome as a result. git-svn completely forgoes
	any automated merge/branch tracking on the Subversion side and leaves it
	entirely up to the user on the git side. It's simply not worth it to do
	a useful translation when the original signal is weak.

	[[tracking-multiple-repos]]
	TRACKING MULTIPLE REPOSITORIES OR BRANCHES
	------------------------------------------
	This is for advanced users, most users should ignore this section.

	Because git-svn does not care about relationships between different
	branches or directories in a Subversion repository, git-svn has a simple
	hack to allow it to track an arbitrary number of related _or_ unrelated
	SVN repositories via one git repository. Simply set the GIT_SVN_ID
	environment variable to a name other other than "git-svn" (the default)
	and git-svn will ignore the contents of the $GIT_DIR/svn/git-svn directory
	and instead do all of its work in $GIT_DIR/svn/$GIT_SVN_ID for that
	invocation. The interface branch will be remotes/$GIT_SVN_ID, instead of
	remotes/git-svn. Any remotes/$GIT_SVN_ID branch should never be modified
	by the user outside of git-svn commands.

	[[fetch-args]]
	ADDITIONAL FETCH ARGUMENTS
	--------------------------
	This is for advanced users, most users should ignore this section.

	Unfetched SVN revisions may be imported as children of existing commits
	by specifying additional arguments to 'fetch'. Additional parents may
	optionally be specified in the form of sha1 hex sums at the
	command-line. Unfetched SVN revisions may also be tied to particular
	git commits with the following syntax:

	------------------------------------------------
	svn_revision_number=git_commit_sha1
	------------------------------------------------

	This allows you to tie unfetched SVN revision 375 to your current HEAD:

	------------------------------------------------
	git-svn fetch 375=$(git-rev-parse HEAD)
	------------------------------------------------

	Advanced Example: Tracking a Reorganized Repository
	~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	Note: this example is now obsolete if you have SVN::* libraries
	installed. Simply use --follow-parent when fetching.

	If you're tracking a directory that has moved, or otherwise been
	branched or tagged off of another directory in the repository and you
	care about the full history of the project, then you can read this
	section.

	This is how Yann Dirson tracked the trunk of the ufoai directory when
	the /trunk directory of his repository was moved to /ufoai/trunk and
	he needed to continue tracking /ufoai/trunk where /trunk left off.

	------------------------------------------------------------------------
	# This log message shows when the repository was reorganized:
	r166 \| ydirson \| 2006-03-02 01:36:55 +0100 (Thu, 02 Mar 2006) \| 1 line
	Changed paths:
	D /trunk
	A /ufoai/trunk (from /trunk:165)

	# First we start tracking the old revisions:
	GIT_SVN_ID=git-oldsvn git-svn init \
	https://svn.sourceforge.net/svnroot/ufoai/trunk
	GIT_SVN_ID=git-oldsvn git-svn fetch -r1:165

	# And now, we continue tracking the new revisions:
	GIT_SVN_ID=git-newsvn git-svn init \
	https://svn.sourceforge.net/svnroot/ufoai/ufoai/trunk
	GIT_SVN_ID=git-newsvn git-svn fetch \
	166=`git-rev-parse refs/remotes/git-oldsvn`
	------------------------------------------------------------------------

	BUGS
	----

	If you are not using the SVN::* Perl libraries and somebody commits a
	conflicting changeset to SVN at a bad moment (right before you commit)
	causing a conflict and your commit to fail, your svn working tree
	($GIT_DIR/git-svn/tree) may be dirtied. The easiest thing to do is
	probably just to rm -rf $GIT_DIR/git-svn/tree and run 'rebuild'.

	We ignore all SVN properties except svn:executable. Too difficult to
	map them since we rely heavily on git write-tree being _exactly_ the
	same on both the SVN and git working trees and I prefer not to clutter
	working trees with metadata files.

	Renamed and copied directories are not detected by git and hence not
	tracked when committing to SVN. I do not plan on adding support for
	this as it's quite difficult and time-consuming to get working for all
	the possible corner cases (git doesn't do it, either). Renamed and
	copied files are fully supported if they're similar enough for git to
	detect them.

	SEE ALSO
	--------
	gitlink:git-rebase[1]

	Author
	------
	Written by Eric Wong <normalperson@yhbt.net>.

	Documentation
	-------------
	Written by Eric Wong <normalperson@yhbt.net>.