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annotate notes/metadata.txt @ 1033:32f6b970c762

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buildmeta: use layouts library for branch and tag mapping in _buildmeta
author David Schleimer <dschleimer@fb.com>
date Fri, 07 Jun 2013 14:49:19 -0700
parents ba801f44d240
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
134
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1 Branches
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2 --------
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Augie Fackler <durin42@gmail.com>
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3 In order to handle branches that are not immediate children of /branches/, the
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Augie Fackler <durin42@gmail.com>
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4 following information must be stored in the revmap:
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5
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6 revision path
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7
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8 Where path is the actual relative path of the branch in svn. An example, with
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9 the previous format for clarification:
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10 New | Old
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11 3 <hash> trunk | 3 <hash>
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12 4 <hash> branches/foo | 4 <hash> foo
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13
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Augie Fackler <durin42@gmail.com>
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14 Tags
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15 ----
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16 Note that if a tag is committed to, we can handle that case by making a branch
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17 and then marking it as deleted. The revmap line would look something like this:
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18 10 <hash> tags/the_tag
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19 And the commit would be done on the hg branch 'modified-tag/the_tag'. Note that
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20 if this was 'tags/releases/1.0.0', then the branch would be
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21 'modified-tag/releases/1.0.0'.
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22
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23 Detecting Closing of Branches
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24 -----------------------------
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25 Subversion users typically remove branches when done with them. This means that
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26 if a commit performs a delete operation on the '' path inside a branch, we can
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27 be sure that the branch no longer exists. The branch should then be marked as
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28 inactive.
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29
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30 Closing Branches
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31 ----------------
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32 As of this writing, Mercurial marks branches as inactive by merging them so they
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33 have no active heads. In order to mark a branch as closed, the active head on
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34 the branch will be used as the first parent of the new changeset, and the second
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35 changeset will be either the active head on the hg branch 'closed-branches' or
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36 be the nullrev. The commit to mark the branch as inactive will happen on the
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37 'closed-branches' branch in Mercurial.
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38
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39 Recovery
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40 --------
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41 hgsubversion stores several pieces of essential metadata in .hg/svn/. In order
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42 to rebuild this data, the key 'convert_revision' should be stored in the extra
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43 dictionary of the converted revision. The key should contain data in the format:
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44 'svn:<uuid>/abs/path@<rev>' where <uuid> is the repo UUID, /abs/path is the
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45 absolute path to the location the edits were made in Subversion (that is, if it
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46 was a trunk commit on /foo/trunk, then /foo/trunk is what gets stored here, even
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47 though the project root does not equal the repo root), and <rev> is the revision
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48 number of the change in Subversion. This key (and its contents) have been
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49 chosen to be compatible with the convert extension so that repos originally
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50 converted to hg using convert can be maintained using hgsubversion if desired.
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51
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52 Tags (tag_info) can be reconstructed by listing the tags directory and then
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53 running log on each tag to determine its parent changeset.
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54
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55 The last revision converted (last_rev) can be converted simply by using the
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56 highest revision number encountered while rebuilding the revision map.
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57
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58 The legacy tag_locations file does not need to be replaced - it will be
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59 obsoleted as part of the long-term branch refactor.
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60
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61 The url will have to be provided by the user. The uuid can be re-requested from
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62 the repository.
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63
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64 branch_info can be rebuilt during the rebuild of the revision map by recording
155
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65 the revisions of all active heads of server-side branches. branch_info contains
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66 a map from branch: (parent_branch, parent_branch_rev, branch_created_rev)