Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 135:3959bffb14e9

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
explicit op name instead math op to get last rev number
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 16 Feb 2011 22:00:39 +0100
parents 645829962785
children ba2bf656f00f
rev   line source
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
102
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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18
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19 import java.io.File;
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20 import java.io.IOException;
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21 import java.util.LinkedList;
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22 import java.util.List;
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23
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24 import org.tmatesoft.hg.core.Nodeid;
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25 import org.tmatesoft.hg.internal.DataAccess;
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26 import org.tmatesoft.hg.internal.DataAccessProvider;
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27 import org.tmatesoft.hg.internal.DigestHelper;
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28 import org.tmatesoft.hg.internal.RevlogStream;
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29 import org.tmatesoft.hg.repo.HgChangelog.Changeset;
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30
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31
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32 /**
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33 * @see http://mercurial.selenic.com/wiki/BundleFormat
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 public class HgBundle {
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40 private final File bundleFile;
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41 private final DataAccessProvider accessProvider;
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42
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43 public HgBundle(DataAccessProvider dap, File bundle) {
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44 accessProvider = dap;
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45 bundleFile = bundle;
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46 }
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48 public void changes(HgRepository hgRepo) throws IOException {
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49 DataAccess da = accessProvider.create(bundleFile);
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50 DigestHelper dh = new DigestHelper();
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51 try {
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52 List<GroupElement> changelogGroup = readGroup(da);
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53 if (changelogGroup.isEmpty()) {
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54 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log?
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55 }
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56 // XXX in fact, bundle not necessarily starts with the first revision missing in hgRepo
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57 // need to 'scroll' till the last one common.
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58 final Nodeid base = changelogGroup.get(0).firstParent();
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59 if (!hgRepo.getChangelog().isKnown(base)) {
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60 throw new IllegalArgumentException("unknown parent");
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61 }
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62 // BundleFormat wiki says:
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63 // Each Changelog entry patches the result of all previous patches
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64 // (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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65 byte[] baseRevContent = hgRepo.getChangelog().content(base);
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66 for (GroupElement ge : changelogGroup) {
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67 byte[] csetContent = RevlogStream.apply(baseRevContent, -1, ge.patches);
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68 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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69 if (!ge.node().equalsTo(dh.asBinary())) {
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70 throw new IllegalStateException("Integrity check failed on " + bundleFile + ", node:" + ge.node());
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71 }
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72 Changeset cs = Changeset.parse(csetContent, 0, csetContent.length);
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73 System.out.println(cs.toString());
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74 baseRevContent = csetContent;
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75 }
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76 } finally {
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77 da.done();
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78 }
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79 }
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81 public void dump() throws IOException {
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82 DataAccess da = accessProvider.create(bundleFile);
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83 try {
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84 LinkedList<String> names = new LinkedList<String>();
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85 if (!da.isEmpty()) {
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86 System.out.println("Changelog group");
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87 List<GroupElement> changelogGroup = readGroup(da);
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88 for (GroupElement ge : changelogGroup) {
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89 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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90 }
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91 System.out.println("Manifest group");
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92 List<GroupElement> manifestGroup = readGroup(da);
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93 for (GroupElement ge : manifestGroup) {
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94 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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95 }
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96 while (!da.isEmpty()) {
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97 int fnameLen = da.readInt();
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98 if (fnameLen <= 4) {
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99 break; // null chunk, the last one.
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100 }
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101 byte[] fname = new byte[fnameLen - 4];
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102 da.readBytes(fname, 0, fname.length);
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103 names.add(new String(fname));
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104 List<GroupElement> fileGroup = readGroup(da);
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105 System.out.println(names.getLast());
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106 for (GroupElement ge : fileGroup) {
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107 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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108 }
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109 }
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110 }
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111 System.out.println(names.size());
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112 for (String s : names) {
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113 System.out.println(s);
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114 }
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115 } finally {
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116 da.done();
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117 }
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118 }
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119
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120 private static List<GroupElement> readGroup(DataAccess da) throws IOException {
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121 int len = da.readInt();
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122 LinkedList<GroupElement> rv = new LinkedList<HgBundle.GroupElement>();
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123 while (len > 4 && !da.isEmpty()) {
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124 byte[] nb = new byte[80];
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125 da.readBytes(nb, 0, 80);
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126 int dataLength = len-84;
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127 LinkedList<RevlogStream.PatchRecord> patches = new LinkedList<RevlogStream.PatchRecord>();
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128 while (dataLength > 0) {
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129 RevlogStream.PatchRecord pr = RevlogStream.PatchRecord.read(da);
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130 patches.add(pr);
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131 dataLength -= pr.len + 12;
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132 }
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133 rv.add(new GroupElement(nb, patches));
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134 len = da.isEmpty() ? 0 : da.readInt();
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135 }
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136 return rv;
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137 }
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138
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139 static class GroupElement {
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140 private byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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141 private List<RevlogStream.PatchRecord> patches;
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142
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143 GroupElement(byte[] fourNodeids, List<RevlogStream.PatchRecord> patchList) {
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144 assert fourNodeids != null && fourNodeids.length == 80;
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145 // patchList.size() > 0
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146 header = fourNodeids;
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147 patches = patchList;
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148 }
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149 public Nodeid node() {
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150 return Nodeid.fromBinary(header, 0);
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151 }
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152 public Nodeid firstParent() {
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153 return Nodeid.fromBinary(header, 20);
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154 }
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155 public Nodeid secondParent() {
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156 return Nodeid.fromBinary(header, 40);
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157 }
37
e45e75e22523 Parse changesets from bundle's changelog group. Refactor Revlog to provide access to revision's raw content
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158 public Nodeid cset() { // cs seems to be changeset
36
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159 return Nodeid.fromBinary(header, 60);
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160 }
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161 }
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162 }