Creating a New Merge Tree

This article is obsolete. We don't use bzr anymore. This howto needs to be rewritten to explain how to create a merge tree in git.

Merge tree in the context of this HOWTO is a tree created specifically to simplify merges of third-party packages into MariaDB. WIth a merge tree there's a clear separation between upstream changes and our changes and in most cases bzr can do the merges automatically.

Here's how I created a merge tree for pcre:

• prerequisites: we already have pcre in the MariaDB tree, together with our changes (otherwise one can trivially create a bzr repository out of source pcre tarball).

• create an empty repository:

mkdir pcre
cd pcre
bzr init

• download pcre source tarball of the same version that we have in the tree — pcre-8.34.tar.bz2

• unpack it in the same place where the files are in the source tree:

• Add files to the repository with the same file-ids as in the MariaDB tree!

• All done. Commit and push

• Now null-merge that into your MariaDB tree. Note, that for the initial merge you need to specify the revision range 0..1

• Remove pcre files that shouldn't be in MariaDB tree, revert all changes that came from pcre (remember — it's a null-merge, pcre-8.34 is already in MariaDB tree), rename files in place as needed, resolve conflicts:

• Verify that the tree is unchanged and commit:

• Congratulations, your new merge tree is ready!

Now see .

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