Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 110:0170f95ca915

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
On Windows, if hg.exe is wrapped into batch file, need to use cmd.exe to let it run
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 31 Jan 2011 19:42:19 +0100
parents a3a2e5deb320
children 645829962785
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
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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
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31 /**
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32 * @see http://mercurial.selenic.com/wiki/BundleFormat
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 public class HgBundle {
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38
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39 private final File bundleFile;
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40 private final DataAccessProvider accessProvider;
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41
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42 public HgBundle(DataAccessProvider dap, File bundle) {
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43 accessProvider = dap;
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44 bundleFile = bundle;
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45 }
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46
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47 public void changes(HgRepository hgRepo) throws IOException {
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48 DataAccess da = accessProvider.create(bundleFile);
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49 DigestHelper dh = new DigestHelper();
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50 try {
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51 List<GroupElement> changelogGroup = readGroup(da);
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52 if (changelogGroup.isEmpty()) {
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53 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log?
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54 }
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55 // XXX in fact, bundle not necessarily starts with the first revision missing in hgRepo
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56 // need to 'scroll' till the last one common.
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57 final Nodeid base = changelogGroup.get(0).firstParent();
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58 if (!hgRepo.getChangelog().isKnown(base)) {
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59 throw new IllegalArgumentException("unknown parent");
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60 }
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61 // BundleFormat wiki says:
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62 // Each Changelog entry patches the result of all previous patches
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63 // (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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64 byte[] baseRevContent = hgRepo.getChangelog().content(base);
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65 for (GroupElement ge : changelogGroup) {
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66 byte[] csetContent = RevlogStream.apply(baseRevContent, -1, ge.patches);
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67 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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68 if (!ge.node().equalsTo(dh.asBinary())) {
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69 throw new IllegalStateException("Integrity check failed on " + bundleFile + ", node:" + ge.node());
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70 }
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71 Changeset cs = Changeset.parse(csetContent, 0, csetContent.length);
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72 System.out.println(cs.toString());
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73 baseRevContent = csetContent;
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74 }
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75 } finally {
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76 da.done();
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77 }
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78 }
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80 public void dump() throws IOException {
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81 DataAccess da = accessProvider.create(bundleFile);
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82 try {
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83 LinkedList<String> names = new LinkedList<String>();
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84 if (!da.isEmpty()) {
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85 System.out.println("Changelog group");
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86 List<GroupElement> changelogGroup = readGroup(da);
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87 for (GroupElement ge : changelogGroup) {
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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 System.out.println("Manifest group");
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91 List<GroupElement> manifestGroup = readGroup(da);
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92 for (GroupElement ge : manifestGroup) {
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93 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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94 }
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95 while (!da.isEmpty()) {
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96 int fnameLen = da.readInt();
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97 if (fnameLen <= 4) {
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98 break; // null chunk, the last one.
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99 }
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100 byte[] fname = new byte[fnameLen - 4];
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101 da.readBytes(fname, 0, fname.length);
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102 names.add(new String(fname));
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103 List<GroupElement> fileGroup = readGroup(da);
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104 System.out.println(names.getLast());
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105 for (GroupElement ge : fileGroup) {
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106 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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107 }
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108 }
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109 }
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110 System.out.println(names.size());
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111 for (String s : names) {
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112 System.out.println(s);
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113 }
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114 } finally {
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115 da.done();
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116 }
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117 }
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118
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119 private static List<GroupElement> readGroup(DataAccess da) throws IOException {
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120 int len = da.readInt();
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121 LinkedList<GroupElement> rv = new LinkedList<HgBundle.GroupElement>();
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122 while (len > 4 && !da.isEmpty()) {
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123 byte[] nb = new byte[80];
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124 da.readBytes(nb, 0, 80);
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125 int dataLength = len-84;
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126 LinkedList<RevlogStream.PatchRecord> patches = new LinkedList<RevlogStream.PatchRecord>();
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127 while (dataLength > 0) {
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128 RevlogStream.PatchRecord pr = RevlogStream.PatchRecord.read(da);
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129 patches.add(pr);
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130 dataLength -= pr.len + 12;
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131 }
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132 rv.add(new GroupElement(nb, patches));
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133 len = da.isEmpty() ? 0 : da.readInt();
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134 }
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135 return rv;
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136 }
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137
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138 static class GroupElement {
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139 private byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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140 private List<RevlogStream.PatchRecord> patches;
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141
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142 GroupElement(byte[] fourNodeids, List<RevlogStream.PatchRecord> patchList) {
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143 assert fourNodeids != null && fourNodeids.length == 80;
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144 // patchList.size() > 0
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145 header = fourNodeids;
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146 patches = patchList;
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147 }
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148 public Nodeid node() {
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149 return Nodeid.fromBinary(header, 0);
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150 }
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151 public Nodeid firstParent() {
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152 return Nodeid.fromBinary(header, 20);
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153 }
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154 public Nodeid secondParent() {
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155 return Nodeid.fromBinary(header, 40);
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156 }
37
e45e75e22523 Parse changesets from bundle's changelog group. Refactor Revlog to provide access to revision's raw content
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157 public Nodeid cset() { // cs seems to be changeset
36
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158 return Nodeid.fromBinary(header, 60);
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159 }
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160 }
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161 }