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Basic Merging

Now you and Sally are working on parallel branches of the project: you're working on a private branch, and Sally is working on the trunk, or main line of development.

For projects that have a large number of contributors, it's common for most people to have working copies of the trunk. Whenever someone needs to make a long-running change that is likely to disrupt the trunk, a standard procedure is to create a private branch and commit changes there until all the work is complete.

So, the good news is that you and Sally aren't interfering with each other. The bad news is that it's very easy to drift too far apart. Remember that one of the problems with the crawl in a hole strategy is that by the time you're finished with your branch, it may be near-impossible to merge your changes back into the trunk without a huge number of conflicts.

Instead, you and Sally might continue to share changes as you work. It's up to you to decide which changes are worth sharing; Subversion gives you the ability to selectively copy changes between branches. And when you're completely finished with your branch, your entire set of branch changes can be copied back into the trunk. In Subversion terminology, the general act of replicating changes from one branch to another is called merging, and it is performed using various invocations of the svn merge subcommand.

In the examples that follow, we're assuming that both your Subversion client and server are running Subversion 1.8 (or later). If either client or server is older than version 1.5, things are more complicated: the system won't track changes automatically, forcing you to use painful manual methods to achieve similar results. That is, you'll always need to use the detailed merge syntax to specify specific ranges of revisions to replicate (see the section called “Merge Syntax: Full Disclosure” later in this chapter), and take special care to keep track of what's already been merged and what hasn't. For this reason, we strongly recommend that you make sure your client and server are at least at version 1.5.

Changesets

Before we proceed further, we should warn you that there's a lot of discussion of changes in the pages ahead. A lot of people experienced with version control systems use the terms change and changeset interchangeably, and we should clarify what Subversion understands as a changeset.

Everyone seems to have a slightly different definition of changeset, or at least a different expectation of what it means for a version control system to have one. For our purposes, let's say that a changeset is just a collection of changes with a unique name. The changes might include textual edits to file contents, modifications to tree structure, or tweaks to metadata. In more common speak, a changeset is just a patch with a name you can refer to.

In Subversion, a global revision number N names a tree in the repository: it's the way the repository looked after the Nth commit. It's also the name of an implicit changeset: if you compare tree N with tree N-1, you can derive the exact patch that was committed. For this reason, it's easy to think of revision N as not just a tree, but a changeset as well. If you use an issue tracker to manage bugs, you can use the revision numbers to refer to particular patches that fix bugs—for example, this issue was fixed by r9238. Somebody can then run svn log -r 9238 to read about the exact changeset that fixed the bug, and run svn diff -c 9238 to see the patch itself. And (as you'll see shortly) Subversion's svn merge command is able to use revision numbers. You can merge specific changesets from one branch to another by naming them in the merge arguments: passing -c 9238 to svn merge would merge changeset r9238 into your working copy.

Keeping a Branch in Sync

Continuing with our running example, let's suppose that a week has passed since you started working on your private branch. Your new feature isn't finished yet, but at the same time you know that other people on your team continue to make important changes in the project's /trunk. It's in your best interest to replicate those changes to your own branch, just to make sure they mesh well with your changes. This is done by performing an automatic sync merge—a merge operation designed to bring your branch up to date with any changes made to its ancestral parent branch since your branch was created. An automatic merge is simply one in which you provide the bare minimum of information required for a merge (i.e. a single merge source and a working copy target) and let Subversion determine which changes need merging—no changesets are passed to svn merge via the -r or -c options in an automatic merge.

[Tip] Tip

Frequently keeping your branch in sync with the main development line helps prevent surprise conflicts when the time comes for you to fold your changes back into the trunk.

Subversion is aware of the history of your branch and knows when it split away from the trunk. To perform a sync merge, first make sure your working copy of the branch is clean—that it has no local modifications reported by svn status. Then simply run:

$ pwd
/home/user/my-calc-branch

$ svn merge ^/calc/trunk
--- Merging r341 through r351 into '.':
U    doc/INSTALL
U    src/real.c
U    src/button.c
U    Makefile
--- Recording mergeinfo for merge of r341 through r351 into '.':
 U   .
 $

This basic syntax—svn merge URL—tells Subversion to merge all changes which have not been previously merged from the URL to the current working directory (which is typically the root of your working copy). Notice that we're using the caret (^) syntax[33] to avoid having to type out the entire /trunk URL. Also note the Recording mergeinfo for merge… notification. This tells you that the merge is updating the svn:mergeinfo property. We'll discuss both this property and these notifications later in this chapter, in the section called “Mergeinfo and Previews”.

[Tip] Tip

In this book and elsewhere (Subversion mailing lists, articles on merge tracking, etc.) you will frequently come across the term mergeinfo. This is simply shorthand for the svn:mergeinfo property.

After running the prior example, your branch working copy now contains new local modifications, and these edits are duplications of all of the changes that have happened on the trunk since you first created your branch:

$ svn status
 M      .
M       Makefile
M       doc/INSTALL
M       src/button.c
M       src/real.c

At this point, the wise thing to do is look at the changes carefully with svn diff, and then build and test your branch. Notice that the current working directory (.) has also been modified; svn diff shows that its svn:mergeinfo property has been created.

$ svn diff --depth empty .
Index: .
===================================================================
--- .   (revision 351)
+++ .   (working copy)

Property changes on: .
___________________________________________________________________
Added: svn:mergeinfo
   Merged /calc/trunk:r341-351

This new property is important merge-related metadata that you should not touch, since it is needed by future svn merge commands. (We'll learn more about this metadata later in the chapter.)

After performing the merge, you might also need to resolve some conflicts—just as you do with svn update—or possibly make some small edits to get things working properly. (Remember, just because there are no syntactic conflicts doesn't mean there aren't any semantic conflicts!) If you encounter serious problems, you can always abort the local changes by running svn revert . -R (which will undo all local modifications) and starting a long what's going on? discussion with your collaborators. If things look good, however, you can submit these changes into the repository:

$ svn commit -m "Sync latest trunk changes to my-calc-branch."
Sending        .
Sending        Makefile
Sending        doc/INSTALL
Sending        src/button.c
Sending        src/real.c
Transmitting file data ....
Committed revision 352.

At this point, your private branch is now in sync with the trunk, so you can rest easier knowing that as you continue to work in isolation, you're not drifting too far away from what everyone else is doing.

Suppose that another week has passed. You've committed more changes to your branch, and your comrades have continued to improve the trunk as well. Once again, you want to replicate the latest trunk changes to your branch and bring yourself in sync. Just run the same merge command again!

$ svn merge ^/calc/trunk
svn: E195020: Cannot merge into mixed-revision working copy [352:357]; try up\
dating first
$

Well that was unexpected! After making changes to your branch over the past week you now find yourself with a working copy that contains a mixture of revisions (see the section called “Bản sao làm việc phiên-bản-hỗn-hợp”). With Subversion 1.7 and later, the svn merge subcommand disables merges into mixed-revision working copies by default. Without going into too much detail, this is because of limitations in the way merges are tracked by the svn:mergeinfo property (see the section called “Mergeinfo and Previews” for details). These limitations mean that merges into mixed-revision working copies can result in unexpected text and tree conflicts.[34] We don't want any needless conflicts, so we update the working copy and then reattempt the merge.

$ svn up
Updating '.':
At revision 361.

$ svn merge ^/calc/trunk
--- Merging r352 through r361 into '.':
U    src/real.c
U    src/main.c
--- Recording mergeinfo for merge of r352 through r361 into '.':
 U   .

Subversion knows which trunk changes you previously replicated to your branch, so it carefully replicates only those changes you don't yet have. And once again, you build, test, and svn commit the local modifications to your branch.

[Tip] Tip

Prior to Subversion 1.7, merges unconditionally updated all of the subtree mergeinfo under the target to describe the merge. For users with a lot of subtree mergeinfo this meant that relatively simple merges (e.g. one which applied a diff to only a single file) resulted in changes to every subtree with mergeinfo, even those that were not parents of the affected path(s). This caused some level of confusion and frustration. Subversion 1.7 and later addresses this problem by only updating the mergeinfo on subtrees which are parents of the paths modified by the merge (i.e. paths changed, added, or deleted by application of the difference, see the section called “Merge Syntax: Full Disclosure”). The one exception to this behavior regards the actual merge target; the merge target's mergeinfo is always updated to describe the merge, even if the applied difference made no changes.

Reintegrating a Branch

What happens when you finally finish your work, though? Your new feature is done, and you're ready to merge your branch changes back to the trunk (so your team can enjoy the bounty of your labor). The process is simple. First, bring your branch into sync with the trunk again, just as you've been doing all along[35]:

$ svn up # (make sure the working copy is up to date)
Updating '.':
At revision 378.

$ svn merge ^/calc/trunk
--- Merging r362 through r378 into '.':
U    src/main.c
--- Recording mergeinfo for merge of r362 through r378 into '.':
 U   .

$ # build, test, ...

$ svn commit -m "Final merge of trunk changes to my-calc-branch."
Sending        .
Sending        src/main.c
Transmitting file data .
Committed revision 379.

Now, use svn merge subcommand to automatically replicate your branch changes back into the trunk. This type of merge is called an automatic reintegrate merge. You'll need a working copy of /calc/trunk. You can get one by doing an svn checkout, dredging up an old trunk working copy from somewhere on your disk, or using svn switch (see the section called “Traversing Branches”).

[Tip] Tip

The term reintegrating comes from the merge option --reintegrate. This option is deprecated in Subversion 1.8 (which automatically detects when a reintegrate merge is needed), but is required for Subversion 1.5 through 1.7 clients when performing reintegrate merges.

Your trunk working copy cannot have any local edits, switched paths, or contain a mixture of revisions (see the section called “Bản sao làm việc phiên-bản-hỗn-hợp”). While these are typically best practices for merging anyway, they are required for automatic reintegrate merges.

Once you have a clean working copy of the trunk, you're ready to merge your branch back into it:

$ pwd
/home/user/calc-trunk

$ svn update
Updating '.':
At revision 379.

$ svn merge ^/calc/branches/my-calc-branch
--- Merging differences between repository URLs into '.':
U    src/real.c
U    src/main.c
U    Makefile
--- Recording mergeinfo for merge between repository URLs into '.':
 U   .

$ # build, test, verify, ...

$ svn commit -m "Merge my-calc-branch back into trunk!"
Sending        .
Sending        Makefile
Sending        src/main.c
Sending        src/real.c
Transmitting file data ...
Committed revision 380.

Congratulations, your branch-specific changes have now been merged back into the main line of development. Notice that the automatic reintegrate merge did a different sort of work than what you've done up until now. Previously, we were asking svn merge to grab the next set of changes from one line of development (the trunk) and duplicate them to another (your branch). This is fairly straightforward, and each time Subversion knows how to pick up where it left off. In our prior examples, you can see that first it merges the ranges 341:351 from /calc/trunk to /calc/branches/my-calc-branch; later on, it continues by merging the next contiguously available range, 351:361. When doing the final sync, it merges the range 361:378.

When merging /calc/branches/my-calc-branch back to the /calc/trunk, however, the underlying mathematics are quite different. Your feature branch is now a mishmash of both duplicated trunk changes and private branch changes, so there's no simple contiguous range of revisions to copy over. By using an automatic merge, you're asking Subversion to carefully replicate only those changes unique to your branch. (And in fact, it does this by comparing the latest trunk tree with the latest branch tree: the resulting difference is exactly your branch changes!)

Keep in mind that the automatic reintegrate merges only support the use case described above. Because of this narrow focus, in addition to the requirements previously mentioned (up-to-date working copy [36] with no mixed-revisions, switched paths or local changes) it will not function in combination with most of the other svn merge options. You'll get an error if you use any non-global options but these: --accept, --dry-run, --diff3-cmd, --extensions, or --quiet.

Now that your private branch is merged to trunk, you may wish to remove it from the repository:

$ svn delete ^/calc/branches/my-calc-branch \
             -m "Remove my-calc-branch, reintegrated with trunk in r381."
…

But wait! Isn't the history of that branch valuable? What if somebody wants to audit the evolution of your feature someday and look at all of your branch changes? No need to worry. Remember that even though your branch is no longer visible in the /calc/branches directory, its existence is still an immutable part of the repository's history. A simple svn log command on the /calc/branches URL will show the entire history of your branch. Your branch can even be resurrected at some point, should you desire (see the section called “Resurrecting Deleted Items”).

If you choose not to delete your branch after reintegrating it to the trunk you may continue to perform sync merges from the trunk and then reintegrate the branch again[37]. If you do this, only the changes made on your branch after the first reintegrate are merged to the trunk.

Mergeinfo and Previews

The basic mechanism Subversion uses to track changesets—that is, which changes have been merged to which branches—is by recording data in versioned properties. Specifically, merge data is tracked in the svn:mergeinfo property attached to files and directories. (If you're not familiar with Subversion properties, see the section called “Properties”.)

You can examine the mergeinfo property, just like any other versioned property:

$ cd my-calc-branch

$ svn pg svn:mergeinfo -v
Properties on '.':
  svn:mergeinfo
    /calc/trunk:341-378
[Warning] Warning

While it is possible to modify svn:mergeinfo just as you might any other versioned property, we strongly discourage doing so unless you really know what you're doing.

[Tip] Tip

The amount of svn:mergeinfo on a single path can get quite large, as can the output of a svn propget --recursive or svn proplist --recursive when dealing with large amounts of subtree mergeinfo. See Subtree Merges and Subtree Mergeinfo . The formatted output produced by the --verbose option with either of these subcommands is often very helpful in these cases.

The svn:mergeinfo property is automatically maintained by Subversion whenever you run svn merge. Its value indicates which changes made to a given path have been replicated into the directory in question. In our previous example, the path which is the source of the merged changes is /calc/trunk and the directory which has received the changes is /calc/branches/my-calc-branch. Earlier versions of Subversion maintained the svn:mergeinfo property silently. You could still detect the changes, after a merge completed, with the svn diff or svn status subcommands, but the merge itself gave no indication when it changed the svn:mergeinfo property. In Subversion 1.7 and later this is no longer true as there are several notifications to alert you when a merge updates the svn:mergeinfo property. These notifications all begin with --- Recording mergeinfo for and appear at the end of the merge. Unlike other merge notifications, these don't describe the application of a difference to a working copy (see the section called “Merge Syntax: Full Disclosure”), but instead describe "housekeeping" changes made to keep track of what was merged.

Subversion also provides a subcommand, svn mergeinfo, which is helpful in seeing the merge relationships between two branches; specifically which changesets a directory has absorbed or which changesets it's still eligible to receive. The latter gives a sort of preview of which changes a subsequent svn merge operation would replicate to your branch. By default, svn mergeinfo gives an graphical overview of the relationship between to branches. Returning to our earlier example, we use the subcommand to analyze the relationship between /calc/trunk and /calc/branches/my-calc-branch:

$ cd my-calc-branch

$ svn mergeinfo ^/calc/trunk
    youngest common ancestor
    |         last full merge
    |         |        tip of branch
    |         |        |         repository path

    340                382
    |                  |
  -------| |------------         calc/trunk
     \          /
      \        /
       --| |------------         calc/branches/my-calc-branch
              |        |
              379      382

The diagram shows that /calc/branches/my-calc-branch was copied from /calc/trunk@340 and that most recent automatic merge was the reintegrate merge we made from the branch to the trunk in r380. Notice that the diagram does not show the four automatic sync merges we made in revisions 352, 362, 372, and 379. Only the most recent automatic merge, in either direction[38], is shown. This default output is useful for obtaining an overview of the merges between two branches, but to see the specific revisions which were merged we use the --show-revs=merged option:

$ svn mergeinfo ^/calc/trunk --show-revs merged
r344
r345
r346
…
r366
r367
r368

Likewise, to see which changes are eligible to merge from the trunk to the branch we can use the --show-revs=eligible option:

$ svn mergeinfo ^/calc/trunk --show-revs eligible
r380
r381
r382

The svn mergeinfo command requires a source URL (where the changes come from), and takes an optional target URL (where the changes merge to). If no target URL is given, it assumes that the current working directory is the target. In the prior example, because we're querying our branch working copy, the command assumes we're interested in receiving changes to /calc/branches/my-calc-branch from the specified trunk URL.

Since Subversion 1.7, the svn mergeinfo subcommand can also account for subtree mergeinfo and non-inheritable mergeinfo. It accounts for subtree mergeinfo by use of the --recursive or --depth options, while non-inheritable mergeinfo is considered by default.

Let's say we have a branch with both subtree and non-inheritable mergeinfo:

$ svn pg svn:mergeinfo -vR
# Non-inheritable mergeinfo
Properties on '.':
  svn:mergeinfo
    /calc/trunk:354,385-388*
# Subtree mergeinfo
Properties on 'Makefile':
  svn:mergeinfo
    /calc/trunk/Makefile:354,380

From the above mergeinfo we see that r385-388 has only been merged into the root of the branch, but not any of the root's children. We also see that r380 has only been merged to Makefile. When we use svn mergeinfo with the --recursive option to see what has been merged from /calc/trunk to this branch, we see three revisions are flagged with the * marker:

$ svn mergeinfo -R --show-revs=merged ^/calc/trunk .
r354
r380*
r385
r386
r387*
r388*

The * indicates revisions that are only partially merged to the target in question (the meaning is the same if we are checking for eligible revisions). What this means in this example is that if we tried to merge r380, r387, or r388 from ^/trunk then more changes would result. Likewise, because r354, r385 and r386 are not flagged with a *, we know that re-merging those revisions would have no result. [39]

Another way to get a more precise preview of a merge operation is to use the --dry-run option:

$ svn merge ^/paint/trunk paint-feature-branch --dry-run
--- Merging r290 through r383 into 'paint-feature-branch':
U    paint-feature-branch/src/palettes.c
U    paint-feature-branch/src/brushes.c
U    paint-feature-branch/Makefile

$ svn status
#  nothing printed, working copy is still unchanged.

The --dry-run option doesn't actually apply any local changes to the working copy. It shows only status codes that would be printed in a real merge. It's useful for getting a high-level preview of the potential merge, for those times when running svn diff gives too much detail.

[Tip] Tip

After performing a merge operation, but before committing the results of the merge, you can use svn diff --depth=empty /path/to/merge/target to see only the changes to the immediate target of your merge. If your merge target was a directory, only property differences are displayed. This is a handy way to see the changes to the svn:mergeinfo property recorded by the merge operation, which will remind you about what you've just merged.

Of course, the best way to preview a merge operation is to just do it! Remember, running svn merge isn't an inherently risky thing (unless you've made local modifications to your working copy—but we already stressed that you shouldn't merge into such an environment). If you don't like the results of the merge, simply run svn revert . -R to revert the changes from your working copy and retry the command with different options. The merge isn't final until you actually svn commit the results.

Undoing Changes

An extremely common use for svn merge is to roll back a change that has already been committed. Suppose you're working away happily on a working copy of /calc/trunk, and you discover that the change made back in revision 392, which changed several code files, is completely wrong. It never should have been committed. You can use svn merge to undo the change in your working copy, and then commit the local modification to the repository. All you need to do is to specify a reverse difference. (You can do this by specifying --revision 392:391, or by an equivalent --change -392.)

$ svn merge ^/calc/trunk . -c-392
--- Reverse-merging r392 into '.':
U    src/real.c
U    src/main.c
U    src/button.c
U    src/integer.c
--- Recording mergeinfo for reverse merge of r392 into '.':
 U   .

$ svn st
M       src/button.c
M       src/integer.c
M       src/main.c
M       src/real.c

$ svn diff
…
# verify that the change is removed
…

$ svn commit -m "Undoing erroneous change committed in r392."
Sending        src/button.c
Sending        src/integer.c
Sending        src/main.c
Sending        src/real.c
Transmitting file data ....
Committed revision 399.

As we mentioned earlier, one way to think about a repository revision is as a specific changeset. By using the -r option, you can ask svn merge to apply a changeset, or a whole range of changesets, to your working copy. In our case of undoing a change, we're asking svn merge to apply changeset r392 to our working copy backward.

Keep in mind that rolling back a change like this is just like any other svn merge operation, so you should use svn status and svn diff to confirm that your work is in the state you want it to be in, and then use svn commit to send the final version to the repository. After committing, this particular changeset is no longer reflected in the HEAD revision.

Again, you may be thinking: well, that really didn't undo the commit, did it? The change still exists in revision 392. If somebody checks out a version of the calc project between revisions 392 and 398, she'll still see the bad change, right?

Yes, that's true. When we talk about removing a change, we're really talking about removing it from the HEAD revision. The original change still exists in the repository's history. For most situations, this is good enough. Most people are only interested in tracking the HEAD of a project anyway. There are special cases, however, where you really might want to destroy all evidence of the commit. (Perhaps somebody accidentally committed a confidential document.) This isn't so easy, it turns out, because Subversion was deliberately designed to never lose information. Revisions are immutable trees that build upon one another. Removing a revision from history would cause a domino effect, creating chaos in all subsequent revisions and possibly invalidating all working copies.[40]

Resurrecting Deleted Items

The great thing about version control systems is that information is never lost. Even when you delete a file or directory, it may be gone from the HEAD revision, but the object still exists in earlier revisions. One of the most common questions new users ask is, How do I get my old file or directory back?

The first step is to define exactly which item you're trying to resurrect. Here's a useful metaphor: you can think of every object in the repository as existing in a sort of two-dimensional coordinate system. The first coordinate is a particular revision tree, and the second coordinate is a path within that tree. So every version of your file or directory is defined by a specific coordinate pair. (Remember the peg revision syntax—foo.c@224—mentioned back in the section called “Peg and Operative Revisions”.)

First, you might need to use svn log to discover the exact coordinate pair you wish to resurrect. A good strategy is to run svn log --verbose in a directory that used to contain your deleted item. The --verbose (-v) option shows a list of all changed items in each revision; all you need to do is find the revision in which you deleted the file or directory. You can do this visually, or by using another tool to examine the log output (via grep, or perhaps via an incremental search in an editor). If you know that the item in question was recently deleted you might also use the --limit option to keep the log output brief enough to examine manually.

$ cd calc/trunk

$ svn log -v --limit 3
------------------------------------------------------------------------
r401 | sally | 2013-02-19 23:15:44 -0500 (Tue, 19 Feb 2013) | 1 line
Changed paths:
   M /calc/trunk/src/main.c

Follow-up to r400: Fix typos in help text.
------------------------------------------------------------------------
r400 | bill | 2013-02-19 20:55:08 -0500 (Tue, 19 Feb 2013) | 4 lines
Changed paths:
   M /calc/trunk/src/main.c
   D /calc/trunk/src/real.c

* calc/trunk/src/main.c: Update help text.

* calc/trunk/src/real.c: Remove this file, none of the APIs
  implemented here are used anymore.
------------------------------------------------------------------------
r399 | sally | 2013-02-19 20:05:14 -0500 (Tue, 19 Feb 2013) | 1 line
Changed paths:
   M /calc/trunk/src/button.c
   M /calc/trunk/src/integer.c
   M /calc/trunk/src/main.c
   M /calc/trunk/src/real.c

Undoing erroneous change committed in r392.
------------------------------------------------------------------------

In the example, we're assuming that you're looking for a deleted file real.c. By looking through the logs of a parent directory, you've spotted that this file was deleted in revision 400. Therefore, the last version of the file to exist was in the revision right before that. Conclusion: you want to resurrect the path /calc/trunk/real.c from revision 399.

That was the hard part—the research. Now that you know what you want to restore, you have two different choices.

One option is to use svn merge to apply revision 400 in reverse. (We already discussed how to undo changes in the section called “Undoing Changes”.) This would have the effect of re-adding real.c as a local modification. The file would be scheduled for addition, and after a commit, the file would again exist in HEAD.

In this particular example, however, this is probably not the best strategy. Reverse-applying revision 400 would not only schedule real.c for addition, but the log message indicates that it would also undo certain changes to main.c, which you don't want. Certainly, you could reverse-merge revision 400 and then svn revert the local modifications to main.c, but this technique doesn't scale well. What if 90 files were changed in revision 400?

A second, more targeted strategy is not to use svn merge at all, but rather to use the svn copy command. Simply copy the exact revision and path coordinate pair from the repository to your working copy:

$ svn copy ^/calc/trunk/src/real.c@399 ./real.c
A         real.c

$ svn st
A  +    real.c

# Commit the resurrection.
…

The plus sign in the status output indicates that the item isn't merely scheduled for addition, but scheduled for addition with history. Subversion remembers where it was copied from. In the future, running svn log on this file will traverse back through the file's resurrection and through all the history it had prior to revision 399. In other words, this new real.c isn't really new; it's a direct descendant of the original, deleted file. This is usually considered a good and useful thing. If, however, you wanted to resurrect the file without maintaining a historical link to the old file, this technique works just as well:

$ svn cat ^/calc/trunk/src/real.c@399 > ./real.c

$ svn add real.c
A         real.c

# Commit the resurrection.
…

Although our example shows us resurrecting a file, note that these same techniques work just as well for resurrecting deleted directories. Also note that a resurrection doesn't have to happen in your working copy—it can happen entirely in the repository:

$ svn copy ^/calc/trunk/src/real.c@399 ^/calc/trunk/src/real.c \
           -m "Resurrect real.c from revision 399."

Committed revision 402.

$ svn up
Updating '.':
A    real.c
Updated to revision 402.


[33] This was introduced in svn 1.6.

[34] The svn merge subcommand option --allow-mixed-revisions allows you to override this prohibition, but you should only do so if you understand the ramifications and have a good reason for it.

[35] Since Subversion 1.7 you don't absolutely have to do all your sync merges to the root of your branch as we do in this example. If your branch is effectively synced via a series of subtree merges then the reintegrate will work, but ask yourself, if the branch is effectively synced, then why are you doing subtree merges? Doing so is almost always needlessly complex.

[36] Automatic reintegrate merges are allowed if the target is a shallow checkout (see the section called “Sparse Directories”) but any paths affected by the diff which are missing due to the sparse working copy will be skipped—this is probably not what you intended!

[37] Only Subversion 1.8 supports this reuse of a feature branch. Earlier versions require some special handling before a feature branch can be reintegrated more than once. See the earlier version of this chapter for more information: http://svnbook.red-bean.com/en/1.7/svn.branchmerge.basicmerging.html#svn.branchemerge.basicmerging.reintegrate

[38] By direction we mean either trunk-to-branch (automatic sync) or branch-to-trunk (automatic reintegrate) merges.

[39] This is a good example of inoperative merge revisions.

[40] The Subversion project has plans, however, to someday implement a command that would accomplish the task of permanently deleting information. In the meantime, see the section called “svndumpfilter” for a possible workaround.