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+}\r
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+}\r
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+}\r
+/* Workarounds for IE6's broken and incomplete CSS2. */\r
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+</style>\r
+<title>How to use the subtree merge strategy</title>\r
+</head>\r
+<body>\r
+<div id="header">\r
+<h1>How to use the subtree merge strategy</h1>\r
+</div>\r
+<div id="preamble">\r
+<div class="sectionbody">\r
+<p>There are situations where you want to include contents in your project\r
+from an independently developed project. You can just pull from the\r
+other project as long as there are no conflicting paths.</p>\r
+<p>The problematic case is when there are conflicting files. Potential\r
+candidates are Makefiles and other standard filenames. You could merge\r
+these files but probably you do not want to. A better solution for this\r
+problem can be to merge the project as its own subdirectory. This is not\r
+supported by the <em>recursive</em> merge strategy, so just pulling won't work.</p>\r
+<p>What you want is the <em>subtree</em> merge strategy, which helps you in such a\r
+situation.</p>\r
+<p>In this example, let's say you have the repository at <tt>/path/to/B</tt> (but\r
+it can be an URL as well, if you want). You want to merge the <em>master</em>\r
+branch of that repository to the <tt>dir-B</tt> subdirectory in your current\r
+branch.</p>\r
+<p>Here is the command sequence you need:</p>\r
+<div class="listingblock">\r
+<div class="content">\r
+<pre><tt>$ git remote add -f Bproject /path/to/B <b>(1)</b>\r
+$ git merge -s ours --no-commit Bproject/master <b>(2)</b>\r
+$ git read-tree --prefix=dir-B/ -u Bproject/master <b>(3)</b>\r
+$ git commit -m "Merge B project as our subdirectory" <b>(4)</b>\r
+\r
+$ git pull -s subtree Bproject master <b>(5)</b></tt></pre>\r
+</div></div>\r
+<ol>\r
+<li>\r
+<p>\r
+name the other project "Bproject", and fetch.\r
+</p>\r
+</li>\r
+<li>\r
+<p>\r
+prepare for the later step to record the result as a merge.\r
+</p>\r
+</li>\r
+<li>\r
+<p>\r
+read "master" branch of Bproject to the subdirectory "dir-B".\r
+</p>\r
+</li>\r
+<li>\r
+<p>\r
+record the merge result.\r
+</p>\r
+</li>\r
+<li>\r
+<p>\r
+maintain the result with subsequent merges using "subtree"\r
+</p>\r
+</li>\r
+</ol>\r
+<p>The first four commands are used for the initial merge, while the last\r
+one is to merge updates from <em>B project</em>.</p>\r
+</div>\r
+</div>\r
+<h2>Comparing <em>subtree</em> merge with submodules</h2>\r
+<div class="sectionbody">\r
+<ul>\r
+<li>\r
+<p>\r
+The benefit of using subtree merge is that it requires less\r
+ administrative burden from the users of your repository. It works with\r
+ older (before Git v1.5.2) clients and you have the code right after\r
+ clone.\r
+</p>\r
+</li>\r
+<li>\r
+<p>\r
+However if you use submodules then you can choose not to transfer the\r
+ submodule objects. This may be a problem with the subtree merge.\r
+</p>\r
+</li>\r
+<li>\r
+<p>\r
+Also, in case you make changes to the other project, it is easier to\r
+ submit changes if you just use submodules.\r
+</p>\r
+</li>\r
+</ul>\r
+</div>\r
+<h2>Additional tips</h2>\r
+<div class="sectionbody">\r
+<ul>\r
+<li>\r
+<p>\r
+If you made changes to the other project in your repository, they may\r
+ want to merge from your project. This is possible using subtree — it\r
+ can shift up the paths in your tree and then they can merge only the\r
+ relevant parts of your tree.\r
+</p>\r
+</li>\r
+<li>\r
+<p>\r
+Please note that if the other project merges from you, then it will\r
+ connects its history to yours, which can be something they don't want\r
+ to.\r
+</p>\r
+</li>\r
+</ul>\r
+</div>\r
+<div id="footer">\r
+<div id="footer-text">\r
+Last updated 15-Jan-2008 08:30:42 UTC\r
+</div>\r
+</div>\r
+</body>\r
+</html>\r
--- /dev/null
+Date: Sat, 5 Jan 2008 20:17:40 -0500
+From: Sean <seanlkml@sympatico.ca>
+To: Miklos Vajna <vmiklos@frugalware.org>
+Cc: git@vger.kernel.org
+Subject: how to use git merge -s subtree?
+Abstract: In this article, Sean demonstrates how one can use the subtree merge
+ strategy.
+Content-type: text/asciidoc
+Message-ID: <BAYC1-PASMTP12374B54BA370A1E1C6E78AE4E0@CEZ.ICE>
+
+How to use the subtree merge strategy
+=====================================
+
+There are situations where you want to include contents in your project
+from an independently developed project. You can just pull from the
+other project as long as there are no conflicting paths.
+
+The problematic case is when there are conflicting files. Potential
+candidates are Makefiles and other standard filenames. You could merge
+these files but probably you do not want to. A better solution for this
+problem can be to merge the project as its own subdirectory. This is not
+supported by the 'recursive' merge strategy, so just pulling won't work.
+
+What you want is the 'subtree' merge strategy, which helps you in such a
+situation.
+
+In this example, let's say you have the repository at `/path/to/B` (but
+it can be an URL as well, if you want). You want to merge the 'master'
+branch of that repository to the `dir-B` subdirectory in your current
+branch.
+
+Here is the command sequence you need:
+
+----------------
+$ git remote add -f Bproject /path/to/B <1>
+$ git merge -s ours --no-commit Bproject/master <2>
+$ git read-tree --prefix=dir-B/ -u Bproject/master <3>
+$ git commit -m "Merge B project as our subdirectory" <4>
+
+$ git pull -s subtree Bproject master <5>
+----------------
+<1> name the other project "Bproject", and fetch.
+<2> prepare for the later step to record the result as a merge.
+<3> read "master" branch of Bproject to the subdirectory "dir-B".
+<4> record the merge result.
+<5> maintain the result with subsequent merges using "subtree"
+
+The first four commands are used for the initial merge, while the last
+one is to merge updates from 'B project'.
+
+Comparing 'subtree' merge with submodules
+-----------------------------------------
+
+- The benefit of using subtree merge is that it requires less
+ administrative burden from the users of your repository. It works with
+ older (before Git v1.5.2) clients and you have the code right after
+ clone.
+
+- However if you use submodules then you can choose not to transfer the
+ submodule objects. This may be a problem with the subtree merge.
+
+- Also, in case you make changes to the other project, it is easier to
+ submit changes if you just use submodules.
+
+Additional tips
+---------------
+
+- If you made changes to the other project in your repository, they may
+ want to merge from your project. This is possible using subtree -- it
+ can shift up the paths in your tree and then they can merge only the
+ relevant parts of your tree.
+
+- Please note that if the other project merges from you, then it will
+ connects its history to yours, which can be something they don't want
+ to.
projects / git.git / commitdiff