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Diffstat (limited to 'Documentation/git-svn.txt')
| -rw-r--r-- | Documentation/git-svn.txt | 176 |
1 files changed, 136 insertions, 40 deletions
diff --git a/Documentation/git-svn.txt b/Documentation/git-svn.txt index cfe8d2b5df..1b8b6498cd 100644 --- a/Documentation/git-svn.txt +++ b/Documentation/git-svn.txt @@ -3,7 +3,7 @@ git-svn(1) NAME ---- -git-svn - Bidirectional operation between a Subversion repository and git +git-svn - Bidirectional operation between a Subversion repository and Git SYNOPSIS -------- @@ -12,8 +12,8 @@ SYNOPSIS DESCRIPTION ----------- -'git svn' is a simple conduit for changesets between Subversion and git. -It provides a bidirectional flow of changes between a Subversion and a git +'git svn' is a simple conduit for changesets between Subversion and Git. +It provides a bidirectional flow of changes between a Subversion and a Git repository. 'git svn' can track a standard Subversion repository, @@ -21,15 +21,15 @@ following the common "trunk/branches/tags" layout, with the --stdlayout option. It can also follow branches and tags in any layout with the -T/-t/-b options (see options to 'init' below, and also the 'clone' command). -Once tracking a Subversion repository (with any of the above methods), the git +Once tracking a Subversion repository (with any of the above methods), the Git repository can be updated from Subversion by the 'fetch' command and -Subversion updated from git by the 'dcommit' command. +Subversion updated from Git by the 'dcommit' command. COMMANDS -------- 'init':: - Initializes an empty git repository with additional + Initializes an empty Git repository with additional metadata directories for 'git svn'. The Subversion URL may be specified as a command-line argument, or as full URL arguments to -T/-t/-b. Optionally, the target @@ -146,6 +146,13 @@ Skip "branches" and "tags" of first level directories;; ------------------------------------------------------------------------ -- +--log-window-size=<n>;; + Fetch <n> log entries per request when scanning Subversion history. + The default is 100. For very large Subversion repositories, larger + values may be needed for 'clone'/'fetch' to complete in reasonable + time. But overly large values may lead to higher memory usage and + request timeouts. + 'clone':: Runs 'init' and 'fetch'. It will automatically create a directory based on the basename of the URL passed to it; @@ -192,9 +199,9 @@ and have no uncommitted changes. Commit each diff from the current branch directly to the SVN repository, and then rebase or reset (depending on whether or not there is a diff between SVN and head). This will create - a revision in SVN for each commit in git. + a revision in SVN for each commit in Git. + -When an optional git branch name (or a git commit object name) +When an optional Git branch name (or a Git commit object name) is specified as an argument, the subcommand works on the specified branch, not on the current branch. + @@ -309,7 +316,7 @@ New features: + -- --show-commit;; - shows the git commit sha1, as well + shows the Git commit sha1, as well --oneline;; our version of --pretty=oneline -- @@ -330,15 +337,25 @@ Any other arguments are passed directly to 'git log' + --git-format;; Produce output in the same format as 'git blame', but with - SVN revision numbers instead of git commit hashes. In this mode, + SVN revision numbers instead of Git commit hashes. In this mode, changes that haven't been committed to SVN (including local working-copy edits) are shown as revision 0. 'find-rev':: When given an SVN revision number of the form 'rN', returns the - corresponding git commit hash (this can optionally be followed by a + corresponding Git commit hash (this can optionally be followed by a tree-ish to specify which branch should be searched). When given a tree-ish, returns the corresponding SVN revision number. ++ +--before;; + Don't require an exact match if given an SVN revision, instead find + the commit corresponding to the state of the SVN repository (on the + current branch) at the specified revision. ++ +--after;; + Don't require an exact match if given an SVN revision; if there is + not an exact match return the closest match searching forward in the + history. 'set-tree':: You should consider using 'dcommit' instead of this command. @@ -361,7 +378,7 @@ Any other arguments are passed directly to 'git log' the $GIT_DIR/info/exclude file. 'mkdirs':: - Attempts to recreate empty directories that core git cannot track + Attempts to recreate empty directories that core Git cannot track based on information in $GIT_DIR/svn/<refname>/unhandled.log files. Empty directories are automatically recreated when using "git svn clone" and "git svn rebase", so "mkdirs" is intended @@ -493,9 +510,9 @@ order. Only the leading sha1 is read from each line, so + 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 +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. +the commit to SVN act like Git. + [verse] config key: svn.rmdir @@ -582,7 +599,7 @@ Passed directly to 'git rebase' when using 'dcommit' if a This can be used with the 'dcommit', 'rebase', 'branch' and 'tag' commands. + -For 'dcommit', print out the series of git arguments that would show +For 'dcommit', print out the series of Git arguments that would show which diffs would be committed to SVN. + For 'rebase', display the local branch associated with the upstream svn @@ -593,14 +610,14 @@ For 'branch' and 'tag', display the urls that will be used for copying when creating the branch or tag. --use-log-author:: - When retrieving svn commits into git (as part of 'fetch', 'rebase', or + When retrieving svn commits into Git (as part of 'fetch', 'rebase', or 'dcommit' operations), look for the first `From:` or `Signed-off-by:` line in the log message and use that as the author string. --add-author-from:: - When committing to svn from git (as part of 'commit-diff', 'set-tree' or 'dcommit' + When committing to svn from Git (as part of 'commit-diff', 'set-tree' or 'dcommit' operations), if the existing log message doesn't already have a `From:` or `Signed-off-by:` line, append a `From:` line based on the - git commit's author string. If you use this, then `--use-log-author` + Git commit's author string. If you use this, then `--use-log-author` will retrieve a valid author string for all commits. @@ -621,10 +638,19 @@ ADVANCED OPTIONS Default: "svn" --follow-parent:: + This option is only relevant if we are tracking branches (using + one of the repository layout options --trunk, --tags, + --branches, --stdlayout). For each tracked branch, try to find + out where its revision was copied from, and set + a suitable parent in the first Git commit for the branch. 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 feature is enabled by default, use + that has been moved around within the repository. If this + feature is disabled, the branches created by 'git svn' will all + be linear and not share any history, meaning that there will be + no information on where branches were branched off or merged. + However, following long/convoluted histories can take a long + time, so disabling this feature may speed up the cloning + process. This feature is enabled by default, use --no-follow-parent to disable it. + [verse] @@ -648,7 +674,7 @@ option for (hopefully) obvious reasons. + This option is NOT recommended as it makes it difficult to track down old references to SVN revision numbers in existing documentation, bug -reports and archives. If you plan to eventually migrate from SVN to git +reports and archives. If you plan to eventually migrate from SVN to Git and are certain about dropping SVN history, consider linkgit:git-filter-branch[1] instead. filter-branch also allows reformatting of metadata for ease-of-reading and rewriting authorship @@ -688,7 +714,7 @@ svn-remote.<name>.rewriteUUID:: svn-remote.<name>.pushurl:: - Similar to git's 'remote.<name>.pushurl', this key is designed + Similar to Git's 'remote.<name>.pushurl', this key is designed to be used in cases where 'url' points to an SVN repository via a read-only transport, to provide an alternate read/write transport. It is assumed that both keys point to the same @@ -732,7 +758,8 @@ for rewriteRoot and rewriteUUID which can be used together. BASIC EXAMPLES -------------- -Tracking and contributing to the trunk of a Subversion-managed project: +Tracking and contributing to the trunk of a Subversion-managed project +(ignoring tags and branches): ------------------------------------------------------------------------ # Clone a repo (like git clone): @@ -741,15 +768,15 @@ Tracking and contributing to the trunk of a Subversion-managed project: cd trunk # You should be on master branch, double-check with 'git branch' git branch -# Do some work and commit locally to git: +# Do some work and commit locally to Git: git commit ... # Something is committed to SVN, rebase your local changes against the # latest changes in SVN: git svn rebase -# Now commit your changes (that were committed previously using git) to SVN, +# Now commit your changes (that were committed previously using Git) to SVN, # as well as automatically updating your working HEAD: git svn dcommit -# Append svn:ignore settings to the default git exclude file: +# Append svn:ignore settings to the default Git exclude file: git svn show-ignore >> .git/info/exclude ------------------------------------------------------------------------ @@ -757,8 +784,10 @@ Tracking and contributing to an entire Subversion-managed project (complete with a trunk, tags and branches): ------------------------------------------------------------------------ -# Clone a repo (like git clone): - git svn clone http://svn.example.com/project -T trunk -b branches -t tags +# Clone a repo with standard SVN directory layout (like git clone): + git svn clone http://svn.example.com/project --stdlayout +# Or, if the repo uses a non-standard directory layout: + git svn clone http://svn.example.com/project -T tr -b branch -t tag # View all branches and tags you have cloned: git branch -r # Create a new branch in SVN @@ -787,7 +816,7 @@ have each person clone that repository with 'git clone': git remote add origin server:/pub/project git config --replace-all remote.origin.fetch '+refs/remotes/*:refs/remotes/*' git fetch -# Prevent fetch/pull from remote git server in the future, +# Prevent fetch/pull from remote Git server in the future, # we only want to use git svn for future updates git config --remove-section remote.origin # Create a local branch from one of the branches just fetched @@ -820,22 +849,68 @@ While 'git svn' can track copy history (including branches and tags) for repositories adopting a standard layout, it cannot yet represent merge history that happened inside git back upstream to SVN users. Therefore it is advised that -users keep history as linear as possible inside git to ease +users keep history as linear as possible inside Git to ease compatibility with SVN (see the CAVEATS section below). +HANDLING OF SVN BRANCHES +------------------------ +If 'git svn' is configured to fetch branches (and --follow-branches +is in effect), it sometimes creates multiple Git branches for one +SVN branch, where the addtional branches have names of the form +'branchname@nnn' (with nnn an SVN revision number). These additional +branches are created if 'git svn' cannot find a parent commit for the +first commit in an SVN branch, to connect the branch to the history of +the other branches. + +Normally, the first commit in an SVN branch consists +of a copy operation. 'git svn' will read this commit to get the SVN +revision the branch was created from. It will then try to find the +Git commit that corresponds to this SVN revision, and use that as the +parent of the branch. However, it is possible that there is no suitable +Git commit to serve as parent. This will happen, among other reasons, +if the SVN branch is a copy of a revision that was not fetched by 'git +svn' (e.g. because it is an old revision that was skipped with +'--revision'), or if in SVN a directory was copied that is not tracked +by 'git svn' (such as a branch that is not tracked at all, or a +subdirectory of a tracked branch). In these cases, 'git svn' will still +create a Git branch, but instead of using an existing Git commit as the +parent of the branch, it will read the SVN history of the directory the +branch was copied from and create appropriate Git commits. This is +indicated by the message "Initializing parent: <branchname>". + +Additionally, it will create a special branch named +'<branchname>@<SVN-Revision>', where <SVN-Revision> is the SVN revision +number the branch was copied from. This branch will point to the newly +created parent commit of the branch. If in SVN the branch was deleted +and later recreated from a different version, there will be multiple +such branches with an '@'. + +Note that this may mean that multiple Git commits are created for a +single SVN revision. + +An example: in an SVN repository with a standard +trunk/tags/branches layout, a directory trunk/sub is created in r.100. +In r.200, trunk/sub is branched by copying it to branches/. 'git svn +clone -s' will then create a branch 'sub'. It will also create new Git +commits for r.100 through r.199 and use these as the history of branch +'sub'. Thus there will be two Git commits for each revision from r.100 +to r.199 (one containing trunk/, one containing trunk/sub/). Finally, +it will create a branch 'sub@200' pointing to the new parent commit of +branch 'sub' (i.e. the commit for r.200 and trunk/sub/). + CAVEATS ------- For the sake of simplicity and interoperating with Subversion, it is recommended that all 'git svn' users clone, fetch and dcommit directly from the SVN server, and avoid all 'git clone'/'pull'/'merge'/'push' -operations between git repositories and branches. The recommended -method of exchanging code between git branches and users is +operations between Git repositories and branches. The recommended +method of exchanging code between Git branches and users is 'git format-patch' and 'git am', or just 'dcommit'ing to the SVN repository. Running 'git merge' or 'git pull' is NOT recommended on a branch you plan to 'dcommit' from because Subversion users cannot see any -merges you've made. Furthermore, if you merge or pull from a git branch +merges you've made. Furthermore, if you merge or pull from a Git branch that is a mirror of an SVN branch, 'dcommit' may commit to the wrong branch. @@ -854,7 +929,7 @@ any 'git svn' metadata, or config. So repositories created and managed with using 'git svn' should use 'rsync' for cloning, if cloning is to be done at all. -Since 'dcommit' uses rebase internally, any git branches you 'git push' to +Since 'dcommit' uses rebase internally, any Git branches you 'git push' to before 'dcommit' on will require forcing an overwrite of the existing ref on the remote repository. This is generally considered bad practice, see the linkgit:git-push[1] documentation for details. @@ -864,10 +939,25 @@ already dcommitted. It is considered bad practice to --amend commits you've already pushed to a remote repository for other users, and dcommit with SVN is analogous to that. +When cloning an SVN repository, if none of the options for describing +the repository layout is used (--trunk, --tags, --branches, +--stdlayout), 'git svn clone' will create a Git repository with +completely linear history, where branches and tags appear as separate +directories in the working copy. While this is the easiest way to get a +copy of a complete repository, for projects with many branches it will +lead to a working copy many times larger than just the trunk. Thus for +projects using the standard directory structure (trunk/branches/tags), +it is recommended to clone with option '--stdlayout'. If the project +uses a non-standard structure, and/or if branches and tags are not +required, it is easiest to only clone one directory (typically trunk), +without giving any repository layout options. If the full history with +branches and tags is required, the options '--trunk' / '--branches' / +'--tags' must be used. + When using multiple --branches or --tags, 'git svn' does not automatically handle name collisions (for example, if two branches from different paths have the same name, or if a branch and a tag have the same name). In these cases, -use 'init' to set up your git repository then, before your first 'fetch', edit +use 'init' to set up your Git repository then, before your first 'fetch', edit the .git/config file so that the branches and tags are associated with different name spaces. For example: @@ -880,18 +970,24 @@ BUGS We ignore all SVN properties except svn:executable. Any unhandled properties are logged to $GIT_DIR/svn/<refname>/unhandled.log -Renamed and copied directories are not detected by git and hence not +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). Committing +the possible corner cases (Git doesn't do it, either). Committing renamed and copied files is fully supported if they're similar enough -for git to detect them. +for Git to detect them. + +In SVN, it is possible (though discouraged) to commit changes to a tag +(because a tag is just a directory copy, thus technically the same as a +branch). When cloning an SVN repository, 'git svn' cannot know if such a +commit to a tag will happen in the future. Thus it acts conservatively +and imports all SVN tags as branches, prefixing the tag name with 'tags/'. CONFIGURATION ------------- 'git svn' stores [svn-remote] configuration information in the -repository .git/config file. It is similar the core git +repository .git/config file. It is similar the core Git [remote] sections except 'fetch' keys do not accept glob arguments; but they are instead handled by the 'branches' and 'tags' keys. Since some SVN repositories are oddly |