Mercurial > jhg

annotate src/com/tmate/hgkit/ll/HgBundle.java @ 52:30bd38978846

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brief explanation of patch record
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 16 Jan 2011 01:30:18 +0100
parents b01500fe2604
children 9429c7bd1920
rev   line source
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1 /*
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2 * Copyright (c) 2011 Artem Tikhomirov
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3 */
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4 package com.tmate.hgkit.ll;
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5
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6 import java.io.File;
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7 import java.io.IOException;
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8 import java.util.LinkedList;
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9 import java.util.List;
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10
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11 import com.tmate.hgkit.fs.DataAccess;
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12 import com.tmate.hgkit.fs.DataAccessProvider;
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13
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14 /**
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15 * @see http://mercurial.selenic.com/wiki/BundleFormat
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16 *
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17 * @author artem
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18 */
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19 public class HgBundle {
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20
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21 private final File bundleFile;
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22 private final DataAccessProvider accessProvider;
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23
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24 public HgBundle(DataAccessProvider dap, File bundle) {
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25 accessProvider = dap;
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26 bundleFile = bundle;
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27 }
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29 public void changes(HgRepository hgRepo) throws IOException {
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30 DataAccess da = accessProvider.create(bundleFile);
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31 DigestHelper dh = new DigestHelper();
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32 try {
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33 List<GroupElement> changelogGroup = readGroup(da);
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34 if (changelogGroup.isEmpty()) {
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35 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log?
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36 }
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37 // XXX in fact, bundle not necessarily starts with the first revision missing in hgRepo
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38 // need to 'scroll' till the last one common.
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39 final Nodeid base = changelogGroup.get(0).firstParent();
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40 if (!hgRepo.getChangelog().isKnown(base)) {
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41 throw new IllegalArgumentException("unknown parent");
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42 }
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43 // BundleFormat wiki says:
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44 // Each Changelog entry patches the result of all previous patches
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45 // (the previous, or parent patch of a given patch p is the patch that has a node equal to p's p1 field)
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46 byte[] baseRevContent = hgRepo.getChangelog().content(base);
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47 for (GroupElement ge : changelogGroup) {
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48 byte[] csetContent = RevlogStream.apply(baseRevContent, -1, ge.patches);
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49 dh = dh.sha1(ge.firstParent(), ge.secondParent(), csetContent); // XXX ge may give me access to byte[] content of nodeid directly, perhaps, I don't need DH to be friend of Nodeid?
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50 if (!ge.node().equalsTo(dh.asBinary())) {
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51 throw new IllegalStateException("Integrity check failed on " + bundleFile + ", node:" + ge.node());
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52 }
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53 Changeset cs = Changeset.parse(csetContent, 0, csetContent.length);
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54 System.out.println(cs.toString());
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55 baseRevContent = csetContent;
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56 }
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57 } finally {
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58 da.done();
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59 }
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60 }
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62 public void dump() throws IOException {
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63 DataAccess da = accessProvider.create(bundleFile);
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64 try {
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65 LinkedList<String> names = new LinkedList<String>();
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66 if (!da.isEmpty()) {
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67 System.out.println("Changelog group");
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68 List<GroupElement> changelogGroup = readGroup(da);
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69 for (GroupElement ge : changelogGroup) {
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70 System.out.printf(" %s %s %s %s; patches:%d\n", ge.node(), ge.firstParent(), ge.secondParent(), ge.cset(), ge.patches.size());
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71 }
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72 System.out.println("Manifest group");
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73 List<GroupElement> manifestGroup = readGroup(da);
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74 for (GroupElement ge : manifestGroup) {
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75 System.out.printf(" %s %s %s %s; patches:%d\n", ge.node(), ge.firstParent(), ge.secondParent(), ge.cset(), ge.patches.size());
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76 }
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77 while (!da.isEmpty()) {
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78 int fnameLen = da.readInt();
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79 if (fnameLen <= 4) {
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80 break; // null chunk, the last one.
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81 }
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82 byte[] fname = new byte[fnameLen - 4];
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83 da.readBytes(fname, 0, fname.length);
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84 names.add(new String(fname));
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85 List<GroupElement> fileGroup = readGroup(da);
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86 System.out.println(names.getLast());
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87 for (GroupElement ge : fileGroup) {
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88 System.out.printf(" %s %s %s %s; patches:%d\n", ge.node(), ge.firstParent(), ge.secondParent(), ge.cset(), ge.patches.size());
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89 }
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90 }
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91 }
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92 System.out.println(names.size());
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93 for (String s : names) {
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94 System.out.println(s);
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95 }
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96 } finally {
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97 da.done();
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98 }
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99 }
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100
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101 private static List<GroupElement> readGroup(DataAccess da) throws IOException {
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102 int len = da.readInt();
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103 LinkedList<GroupElement> rv = new LinkedList<HgBundle.GroupElement>();
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104 while (len > 4 && !da.isEmpty()) {
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105 byte[] nb = new byte[80];
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106 da.readBytes(nb, 0, 80);
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107 int dataLength = len-84;
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108 LinkedList<RevlogStream.PatchRecord> patches = new LinkedList<RevlogStream.PatchRecord>();
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109 while (dataLength > 0) {
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110 RevlogStream.PatchRecord pr = RevlogStream.PatchRecord.read(da);
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111 patches.add(pr);
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112 dataLength -= pr.len + 12;
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113 }
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114 rv.add(new GroupElement(nb, patches));
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115 len = da.isEmpty() ? 0 : da.readInt();
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116 }
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117 return rv;
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118 }
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119
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120 static class GroupElement {
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121 private byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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122 private List<RevlogStream.PatchRecord> patches;
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123
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124 GroupElement(byte[] fourNodeids, List<RevlogStream.PatchRecord> patchList) {
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125 assert fourNodeids != null && fourNodeids.length == 80;
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126 // patchList.size() > 0
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127 header = fourNodeids;
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128 patches = patchList;
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129 }
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130 public Nodeid node() {
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131 return Nodeid.fromBinary(header, 0);
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132 }
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133 public Nodeid firstParent() {
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134 return Nodeid.fromBinary(header, 20);
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135 }
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136 public Nodeid secondParent() {
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137 return Nodeid.fromBinary(header, 40);
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138 }
37
e45e75e22523 Parse changesets from bundle's changelog group. Refactor Revlog to provide access to revision's raw content
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139 public Nodeid cset() { // cs seems to be changeset
36
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140 return Nodeid.fromBinary(header, 60);
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141 }
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142 }
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143 }