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| </head> | |
| <body class="article"> | |
| <div id="header"> | |
| <h1>Trivial merge rules</h1> | |
| </div> | |
| <div id="content"> | |
| <div id="preamble"> | |
| <div class="sectionbody"> | |
| <div class="paragraph"><p>This document describes the outcomes of the trivial merge logic in read-tree.</p></div> | |
| </div> | |
| </div> | |
| <div class="sect1"> | |
| <h2 id="_one_way_merge">One-way merge</h2> | |
| <div class="sectionbody"> | |
| <div class="paragraph"><p>This replaces the index with a different tree, keeping the stat info | |
| for entries that don’t change, and allowing -u to make the minimum | |
| required changes to the working tree to have it match.</p></div> | |
| <div class="paragraph"><p>Entries marked <em>+</em> have stat information. Spaces marked <em>*</em> don’t | |
| affect the result.</p></div> | |
| <div class="literalblock"> | |
| <div class="content"> | |
| <pre><code>index tree result | |
| ----------------------- | |
| * (empty) (empty) | |
| (empty) tree tree | |
| index+ tree tree | |
| index+ index index+</code></pre> | |
| </div></div> | |
| </div> | |
| </div> | |
| <div class="sect1"> | |
| <h2 id="_two_way_merge">Two-way merge</h2> | |
| <div class="sectionbody"> | |
| <div class="paragraph"><p>It is permitted for the index to lack an entry; this does not prevent | |
| any case from applying.</p></div> | |
| <div class="paragraph"><p>If the index exists, it is an error for it not to match either the old | |
| or the result.</p></div> | |
| <div class="paragraph"><p>If multiple cases apply, the one used is listed first.</p></div> | |
| <div class="paragraph"><p>A result which changes the index is an error if the index is not empty | |
| and not up to date.</p></div> | |
| <div class="paragraph"><p>Entries marked <em>+</em> have stat information. Spaces marked <em>*</em> don’t | |
| affect the result.</p></div> | |
| <div class="literalblock"> | |
| <div class="content"> | |
| <pre><code>case index old new result | |
| ------------------------------------- | |
| 0/2 (empty) * (empty) (empty) | |
| 1/3 (empty) * new new | |
| 4/5 index+ (empty) (empty) index+ | |
| 6/7 index+ (empty) index index+ | |
| 10 index+ index (empty) (empty) | |
| 14/15 index+ old old index+ | |
| 18/19 index+ old index index+ | |
| 20 index+ index new new</code></pre> | |
| </div></div> | |
| </div> | |
| </div> | |
| <div class="sect1"> | |
| <h2 id="_three_way_merge">Three-way merge</h2> | |
| <div class="sectionbody"> | |
| <div class="paragraph"><p>It is permitted for the index to lack an entry; this does not prevent | |
| any case from applying.</p></div> | |
| <div class="paragraph"><p>If the index exists, it is an error for it not to match either the | |
| head or (if the merge is trivial) the result.</p></div> | |
| <div class="paragraph"><p>If multiple cases apply, the one used is listed first.</p></div> | |
| <div class="paragraph"><p>A result of "no merge" means that index is left in stage 0, ancest in | |
| stage 1, head in stage 2, and remote in stage 3 (if any of these are | |
| empty, no entry is left for that stage). Otherwise, the given entry is | |
| left in stage 0, and there are no other entries.</p></div> | |
| <div class="paragraph"><p>A result of "no merge" is an error if the index is not empty and not | |
| up to date.</p></div> | |
| <div class="paragraph"><p><strong>empty</strong> means that the tree must not have a directory-file conflict | |
| with the entry.</p></div> | |
| <div class="paragraph"><p>For multiple ancestors, a <em>+</em> means that this case applies even if | |
| only one ancestor or remote fits; a <em>^</em> means all of the ancestors | |
| must be the same.</p></div> | |
| <div class="literalblock"> | |
| <div class="content"> | |
| <pre><code>case ancest head remote result | |
| ---------------------------------------- | |
| 1 (empty)+ (empty) (empty) (empty) | |
| 2ALT (empty)+ *empty* remote remote | |
| 2 (empty)^ (empty) remote no merge | |
| 3ALT (empty)+ head *empty* head | |
| 3 (empty)^ head (empty) no merge | |
| 4 (empty)^ head remote no merge | |
| 5ALT * head head head | |
| 6 ancest+ (empty) (empty) no merge | |
| 8 ancest^ (empty) ancest no merge | |
| 7 ancest+ (empty) remote no merge | |
| 10 ancest^ ancest (empty) no merge | |
| 9 ancest+ head (empty) no merge | |
| 16 anc1/anc2 anc1 anc2 no merge | |
| 13 ancest+ head ancest head | |
| 14 ancest+ ancest remote remote | |
| 11 ancest+ head remote no merge</code></pre> | |
| </div></div> | |
| <div class="paragraph"><p>Only #2ALT and #3ALT use <strong>empty</strong>, because these are the only cases | |
| where there can be conflicts that didn’t exist before. Note that we | |
| allow directory-file conflicts between things in different stages | |
| after the trivial merge.</p></div> | |
| <div class="paragraph"><p>A possible alternative for #6 is (empty), which would make it like | |
| #1. This is not used, due to the likelihood that it arises due to | |
| moving the file to multiple different locations or moving and deleting | |
| it in different branches.</p></div> | |
| <div class="paragraph"><p>Case #1 is included for completeness, and also in case we decide to | |
| put on <em>+</em> markings; any path that is never mentioned at all isn’t | |
| handled.</p></div> | |
| <div class="paragraph"><p>Note that #16 is when both #13 and #14 apply; in this case, we refuse | |
| the trivial merge, because we can’t tell from this data which is | |
| right. This is a case of a reverted patch (in some direction, maybe | |
| multiple times), and the right answer depends on looking at crossings | |
| of history or common ancestors of the ancestors.</p></div> | |
| <div class="paragraph"><p>Note that, between #6, #7, #9, and #11, all cases not otherwise | |
| covered are handled in this table.</p></div> | |
| <div class="paragraph"><p>For #8 and #10, there is alternative behavior, not currently | |
| implemented, where the result is (empty). As currently implemented, | |
| the automatic merge will generally give this effect.</p></div> | |
| </div> | |
| </div> | |
| </div> | |
| <div id="footnotes"><hr /></div> | |
| <div id="footer"> | |
| <div id="footer-text"> | |
| Last updated | |
| 2020-03-09 21:09:52 PDT | |
| </div> | |
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