git svn - Git-svn merge two SVN branches -


i have read numerous questions , blogs on git-svn , merging. of them (notably git-svn man page) warns against using merge anywhere near branch plan dcommit from.

others, so answer, state merging fine long use one-off feature branches delete before dcommitting.

i have setup 2 long-living svn (and git) branches:

  • trunk (git-svn: svn/trunk, git: master) - stable branch
  • branches/devel (git-svn: svn/devel, git: devel) - main development branch fork off feature branches (and can live rebasing them devel instead of merging).

snapshot of current state in source tree

in picture above, (1) shows past svn history, branches/devel has been merged trunk.

(2) shows have dcommitted current development svn.

the question: can use git-svn merge two svn branches history shows merge point (as svn can do)? in other words: happens if dcommit master shown in (3)?

will mess svn (or git) history? or plain forget devel merged master @ all?

edit: if git forgets devel merged master, there difference between dcommiting point (3) , applying commits single patch?

digging more matter, found out git supports setting svn:mergeinfo property on svn branch when dcommit'ing:

git svn dcommit --mergeinfo "/branches/somebranch:1-3"

nb! svn:mergeinfo overwritten whatever given on command-line, careful list previous merges too.

while more recent git version added config parameter automatically set property:

config key: svn.pushmergeinfo

i had troubles automatic mergeinfo - 1 reason or other git calculated wrong , couldn't work.

solution: git-merge-svn

to automate process, wrote shell script git-merge-svn can used merge 2 svn branches correct svn:mergeinfo set on dcommit.

the script handles both situations:

  • the branch not merged in git - git merge beforehand
  • the branches have been merged in git (but not in svn) - traverse until previous ancestor merged commit revisions.

with script able produce these merges solely on git-side , retain merge info git graph shows log nicely:

git-merge-svn result

example usage:

  1. make commits on devel6
  2. dcommit devel6 svn (required svn revision numbers commits)
  3. check out testtunk6 - yes, know made typo in name ;-)
  4. git merge-svn devel6

the last commant outputs:

% git merge-svn devel6 svn merge: devel6 -> testtunk6  * new merge commit |\ | * devel6 [7b71187] (r102) * | testtunk6 [0682a45] (r101)  \|   * [273d6d6] (r100)   step 1: git merge executing:   git merge devel6  continue? (y/n) [n]: y merge made 'recursive' strategy.  testfile | 1 +  1 file changed, 1 insertion(+)  step 2: svn dcommit  executing: git svn dcommit --mergeinfo /idp/branches/devel:9-32,35-41 /idp/branches/devel6:89 /idp/branches/devel6:94 /idp/branches/devel6:93 /idp/branches/devel6:96 /idp/branches/devel6:97 /idp/branches/devel6:99 /idp/branches/devel6:100 /idp/branches/devel6:102  continue? (y/n) [n]: y committing https://my.svn.host/svn/auth/idp/branches/testtunk6 ...   m testfile committed r103   m testfile found merge parent (svn:mergeinfo prop): 7b71187fc371d3f86658c5850009e63be88157ac r103 = 87759323cbadd38bac78087d57b6870a926287e7 (refs/remotes/svn/testtunk6) no changes between 3fb2168cfbbe605fbd810d76513443203a85a549 , refs/remotes/svn/testtunk6 resetting latest refs/remotes/svn/testtunk6

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