gitformat-index.html

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 544 /////////////////////////////////////////////////////////////////////
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 546 /////////////////////////////////////////////////////////////////////
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 548 /* Author: Mihai Bazon, September 2002
 549  * http://students.infoiasi.ro/~mishoo
 550  *
 551  * Table Of Content generator
 552  * Version: 0.4
 553  *
 554  * Feel free to use this script under the terms of the GNU General Public
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 558  /* modified by Troy D. Hanson, September 2006. License: GPL */
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 644 /* Based on footnote generation code from:
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 732 /*]]>*/
 733 </script>
 734 </head>
 735 <body class="manpage">
 736 <div id="header">
 737 <h1>
 738 gitformat-index(5) Manual Page
 739 </h1>
 740 <h2>NAME</h2>
 741 <div class="sectionbody">
 742 <p>gitformat-index -
 743    Git index format
 744 </p>
 745 </div>
 746 </div>
 747 <div id="content">
 748 <div class="sect1">
 749 <h2 id="_synopsis">SYNOPSIS</h2>
 750 <div class="sectionbody">
 751 <div class="verseblock">
 752 <pre class="content">$GIT_DIR/index</pre>
 753 <div class="attribution">
 754 </div></div>
 755 </div>
 756 </div>
 757 <div class="sect1">
 758 <h2 id="_description">DESCRIPTION</h2>
 759 <div class="sectionbody">
 760 <div class="paragraph"><p>Git index format</p></div>
 761 </div>
 762 </div>
 763 <div class="sect1">
 764 <h2 id="_the_git_index_file_has_the_following_format">The Git index file has the following format</h2>
 765 <div class="sectionbody">
 766 <div class="literalblock">
 767 <div class="content">
 768 <pre><code>All binary numbers are in network byte order.
 769 In a repository using the traditional SHA-1, checksums and object IDs
 770 (object names) mentioned below are all computed using SHA-1.  Similarly,
 771 in SHA-256 repositories, these values are computed using SHA-256.
 772 Version 2 is described here unless stated otherwise.</code></pre>
 773 </div></div>
 774 <div class="ulist"><ul>
 775 <li>
 776 <p>
 777 A 12-byte header consisting of
 778 </p>
 779 <div class="literalblock">
 780 <div class="content">
 781 <pre><code>4-byte signature:
 782   The signature is { 'D', 'I', 'R', 'C' } (stands for "dircache")</code></pre>
 783 </div></div>
 784 <div class="literalblock">
 785 <div class="content">
 786 <pre><code>4-byte version number:
 787   The current supported versions are 2, 3 and 4.</code></pre>
 788 </div></div>
 789 <div class="literalblock">
 790 <div class="content">
 791 <pre><code>32-bit number of index entries.</code></pre>
 792 </div></div>
 793 </li>
 794 <li>
 795 <p>
 796 A number of sorted index entries (see below).
 797 </p>
 798 </li>
 799 <li>
 800 <p>
 801 Extensions
 802 </p>
 803 <div class="literalblock">
 804 <div class="content">
 805 <pre><code>Extensions are identified by signature. Optional extensions can
 806 be ignored if Git does not understand them.</code></pre>
 807 </div></div>
 808 <div class="literalblock">
 809 <div class="content">
 810 <pre><code>4-byte extension signature. If the first byte is 'A'..'Z' the
 811 extension is optional and can be ignored.</code></pre>
 812 </div></div>
 813 <div class="literalblock">
 814 <div class="content">
 815 <pre><code>32-bit size of the extension</code></pre>
 816 </div></div>
 817 <div class="literalblock">
 818 <div class="content">
 819 <pre><code>Extension data</code></pre>
 820 </div></div>
 821 </li>
 822 <li>
 823 <p>
 824 Hash checksum over the content of the index file before this checksum.
 825 </p>
 826 </li>
 827 </ul></div>
 828 </div>
 829 </div>
 830 <div class="sect1">
 831 <h2 id="_index_entry">Index entry</h2>
 832 <div class="sectionbody">
 833 <div class="literalblock">
 834 <div class="content">
 835 <pre><code>Index entries are sorted in ascending order on the name field,
 836 interpreted as a string of unsigned bytes (i.e. memcmp() order, no
 837 localization, no special casing of directory separator '/'). Entries
 838 with the same name are sorted by their stage field.</code></pre>
 839 </div></div>
 840 <div class="literalblock">
 841 <div class="content">
 842 <pre><code>An index entry typically represents a file. However, if sparse-checkout
 843 is enabled in cone mode (`core.sparseCheckoutCone` is enabled) and the
 844 `extensions.sparseIndex` extension is enabled, then the index may
 845 contain entries for directories outside of the sparse-checkout definition.
 846 These entries have mode `040000`, include the `SKIP_WORKTREE` bit, and
 847 the path ends in a directory separator.</code></pre>
 848 </div></div>
 849 <div class="literalblock">
 850 <div class="content">
 851 <pre><code>32-bit ctime seconds, the last time a file's metadata changed
 852   this is stat(2) data</code></pre>
 853 </div></div>
 854 <div class="literalblock">
 855 <div class="content">
 856 <pre><code>32-bit ctime nanosecond fractions
 857   this is stat(2) data</code></pre>
 858 </div></div>
 859 <div class="literalblock">
 860 <div class="content">
 861 <pre><code>32-bit mtime seconds, the last time a file's data changed
 862   this is stat(2) data</code></pre>
 863 </div></div>
 864 <div class="literalblock">
 865 <div class="content">
 866 <pre><code>32-bit mtime nanosecond fractions
 867   this is stat(2) data</code></pre>
 868 </div></div>
 869 <div class="literalblock">
 870 <div class="content">
 871 <pre><code>32-bit dev
 872   this is stat(2) data</code></pre>
 873 </div></div>
 874 <div class="literalblock">
 875 <div class="content">
 876 <pre><code>32-bit ino
 877   this is stat(2) data</code></pre>
 878 </div></div>
 879 <div class="literalblock">
 880 <div class="content">
 881 <pre><code>32-bit mode, split into (high to low bits)</code></pre>
 882 </div></div>
 883 <div class="literalblock">
 884 <div class="content">
 885 <pre><code>16-bit unused, must be zero</code></pre>
 886 </div></div>
 887 <div class="literalblock">
 888 <div class="content">
 889 <pre><code>4-bit object type
 890   valid values in binary are 1000 (regular file), 1010 (symbolic link)
 891   and 1110 (gitlink)</code></pre>
 892 </div></div>
 893 <div class="literalblock">
 894 <div class="content">
 895 <pre><code>3-bit unused, must be zero</code></pre>
 896 </div></div>
 897 <div class="literalblock">
 898 <div class="content">
 899 <pre><code>9-bit unix permission. Only 0755 and 0644 are valid for regular files.
 900 Symbolic links and gitlinks have value 0 in this field.</code></pre>
 901 </div></div>
 902 <div class="literalblock">
 903 <div class="content">
 904 <pre><code>32-bit uid
 905   this is stat(2) data</code></pre>
 906 </div></div>
 907 <div class="literalblock">
 908 <div class="content">
 909 <pre><code>32-bit gid
 910   this is stat(2) data</code></pre>
 911 </div></div>
 912 <div class="literalblock">
 913 <div class="content">
 914 <pre><code>32-bit file size
 915   This is the on-disk size from stat(2), truncated to 32-bit.</code></pre>
 916 </div></div>
 917 <div class="literalblock">
 918 <div class="content">
 919 <pre><code>Object name for the represented object</code></pre>
 920 </div></div>
 921 <div class="literalblock">
 922 <div class="content">
 923 <pre><code>A 16-bit 'flags' field split into (high to low bits)</code></pre>
 924 </div></div>
 925 <div class="literalblock">
 926 <div class="content">
 927 <pre><code>1-bit assume-valid flag</code></pre>
 928 </div></div>
 929 <div class="literalblock">
 930 <div class="content">
 931 <pre><code>1-bit extended flag (must be zero in version 2)</code></pre>
 932 </div></div>
 933 <div class="literalblock">
 934 <div class="content">
 935 <pre><code>2-bit stage (during merge)</code></pre>
 936 </div></div>
 937 <div class="literalblock">
 938 <div class="content">
 939 <pre><code>12-bit name length if the length is less than 0xFFF; otherwise 0xFFF
 940 is stored in this field.</code></pre>
 941 </div></div>
 942 <div class="literalblock">
 943 <div class="content">
 944 <pre><code>(Version 3 or later) A 16-bit field, only applicable if the
 945 "extended flag" above is 1, split into (high to low bits).</code></pre>
 946 </div></div>
 947 <div class="literalblock">
 948 <div class="content">
 949 <pre><code>1-bit reserved for future</code></pre>
 950 </div></div>
 951 <div class="literalblock">
 952 <div class="content">
 953 <pre><code>1-bit skip-worktree flag (used by sparse checkout)</code></pre>
 954 </div></div>
 955 <div class="literalblock">
 956 <div class="content">
 957 <pre><code>1-bit intent-to-add flag (used by "git add -N")</code></pre>
 958 </div></div>
 959 <div class="literalblock">
 960 <div class="content">
 961 <pre><code>13-bit unused, must be zero</code></pre>
 962 </div></div>
 963 <div class="literalblock">
 964 <div class="content">
 965 <pre><code>Entry path name (variable length) relative to top level directory
 966   (without leading slash). '/' is used as path separator. The special
 967   path components ".", ".." and ".git" (without quotes) are disallowed.
 968   Trailing slash is also disallowed.</code></pre>
 969 </div></div>
 970 <div class="literalblock">
 971 <div class="content">
 972 <pre><code>The exact encoding is undefined, but the '.' and '/' characters
 973 are encoded in 7-bit ASCII and the encoding cannot contain a NUL
 974 byte (iow, this is a UNIX pathname).</code></pre>
 975 </div></div>
 976 <div class="literalblock">
 977 <div class="content">
 978 <pre><code>(Version 4) In version 4, the entry path name is prefix-compressed
 979   relative to the path name for the previous entry (the very first
 980   entry is encoded as if the path name for the previous entry is an
 981   empty string).  At the beginning of an entry, an integer N in the
 982   variable width encoding (the same encoding as the offset is encoded
 983   for OFS_DELTA pack entries; see linkgit:gitformat-pack[5]) is stored, followed
 984   by a NUL-terminated string S.  Removing N bytes from the end of the
 985   path name for the previous entry, and replacing it with the string S
 986   yields the path name for this entry.</code></pre>
 987 </div></div>
 988 <div class="literalblock">
 989 <div class="content">
 990 <pre><code>1-8 nul bytes as necessary to pad the entry to a multiple of eight bytes
 991 while keeping the name NUL-terminated.</code></pre>
 992 </div></div>
 993 <div class="literalblock">
 994 <div class="content">
 995 <pre><code>(Version 4) In version 4, the padding after the pathname does not
 996 exist.</code></pre>
 997 </div></div>
 998 <div class="literalblock">
 999 <div class="content">
1000 <pre><code>Interpretation of index entries in split index mode is completely
1001 different. See below for details.</code></pre>
1002 </div></div>
1003 </div>
1004 </div>
1005 <div class="sect1">
1006 <h2 id="_extensions">Extensions</h2>
1007 <div class="sectionbody">
1008 <div class="sect2">
1009 <h3 id="_cache_tree">Cache tree</h3>
1010 <div class="literalblock">
1011 <div class="content">
1012 <pre><code>Since the index does not record entries for directories, the cache
1013 entries cannot describe tree objects that already exist in the object
1014 database for regions of the index that are unchanged from an existing
1015 commit. The cache tree extension stores a recursive tree structure that
1016 describes the trees that already exist and completely match sections of
1017 the cache entries. This speeds up tree object generation from the index
1018 for a new commit by only computing the trees that are "new" to that
1019 commit. It also assists when comparing the index to another tree, such
1020 as `HEAD^{tree}`, since sections of the index can be skipped when a tree
1021 comparison demonstrates equality.</code></pre>
1022 </div></div>
1023 <div class="literalblock">
1024 <div class="content">
1025 <pre><code>The recursive tree structure uses nodes that store a number of cache
1026 entries, a list of subnodes, and an object ID (OID). The OID references
1027 the existing tree for that node, if it is known to exist. The subnodes
1028 correspond to subdirectories that themselves have cache tree nodes. The
1029 number of cache entries corresponds to the number of cache entries in
1030 the index that describe paths within that tree's directory.</code></pre>
1031 </div></div>
1032 <div class="literalblock">
1033 <div class="content">
1034 <pre><code>The extension tracks the full directory structure in the cache tree
1035 extension, but this is generally smaller than the full cache entry list.</code></pre>
1036 </div></div>
1037 <div class="literalblock">
1038 <div class="content">
1039 <pre><code>When a path is updated in index, Git invalidates all nodes of the
1040 recursive cache tree corresponding to the parent directories of that
1041 path. We store these tree nodes as being "invalid" by using "-1" as the
1042 number of cache entries. Invalid nodes still store a span of index
1043 entries, allowing Git to focus its efforts when reconstructing a full
1044 cache tree.</code></pre>
1045 </div></div>
1046 <div class="literalblock">
1047 <div class="content">
1048 <pre><code>The signature for this extension is { 'T', 'R', 'E', 'E' }.</code></pre>
1049 </div></div>
1050 <div class="literalblock">
1051 <div class="content">
1052 <pre><code>A series of entries fill the entire extension; each of which
1053 consists of:</code></pre>
1054 </div></div>
1055 <div class="ulist"><ul>
1056 <li>
1057 <p>
1058 NUL-terminated path component (relative to its parent directory);
1059 </p>
1060 </li>
1061 <li>
1062 <p>
1063 ASCII decimal number of entries in the index that is covered by the
1064     tree this entry represents (entry_count);
1065 </p>
1066 </li>
1067 <li>
1068 <p>
1069 A space (ASCII 32);
1070 </p>
1071 </li>
1072 <li>
1073 <p>
1074 ASCII decimal number that represents the number of subtrees this
1075     tree has;
1076 </p>
1077 </li>
1078 <li>
1079 <p>
1080 A newline (ASCII 10); and
1081 </p>
1082 </li>
1083 <li>
1084 <p>
1085 Object name for the object that would result from writing this span
1086     of index as a tree.
1087 </p>
1088 <div class="literalblock">
1089 <div class="content">
1090 <pre><code>An entry can be in an invalidated state and is represented by having
1091 a negative number in the entry_count field. In this case, there is no
1092 object name and the next entry starts immediately after the newline.
1093 When writing an invalid entry, -1 should always be used as entry_count.</code></pre>
1094 </div></div>
1095 <div class="literalblock">
1096 <div class="content">
1097 <pre><code>The entries are written out in the top-down, depth-first order.  The
1098 first entry represents the root level of the repository, followed by the
1099 first subtree--let's call this A--of the root level (with its name
1100 relative to the root level), followed by the first subtree of A (with
1101 its name relative to A), and so on. The specified number of subtrees
1102 indicates when the current level of the recursive stack is complete.</code></pre>
1103 </div></div>
1104 </li>
1105 </ul></div>
1106 </div>
1107 <div class="sect2">
1108 <h3 id="_resolve_undo">Resolve undo</h3>
1109 <div class="literalblock">
1110 <div class="content">
1111 <pre><code>A conflict is represented in the index as a set of higher stage entries.
1112 When a conflict is resolved (e.g. with "git add path"), these higher
1113 stage entries will be removed and a stage-0 entry with proper resolution
1114 is added.</code></pre>
1115 </div></div>
1116 <div class="literalblock">
1117 <div class="content">
1118 <pre><code>When these higher stage entries are removed, they are saved in the
1119 resolve undo extension, so that conflicts can be recreated (e.g. with
1120 "git checkout -m"), in case users want to redo a conflict resolution
1121 from scratch.</code></pre>
1122 </div></div>
1123 <div class="literalblock">
1124 <div class="content">
1125 <pre><code>The signature for this extension is { 'R', 'E', 'U', 'C' }.</code></pre>
1126 </div></div>
1127 <div class="literalblock">
1128 <div class="content">
1129 <pre><code>A series of entries fill the entire extension; each of which
1130 consists of:</code></pre>
1131 </div></div>
1132 <div class="ulist"><ul>
1133 <li>
1134 <p>
1135 NUL-terminated pathname the entry describes (relative to the root of
1136     the repository, i.e. full pathname);
1137 </p>
1138 </li>
1139 <li>
1140 <p>
1141 Three NUL-terminated ASCII octal numbers, entry mode of entries in
1142     stage 1 to 3 (a missing stage is represented by "0" in this field);
1143     and
1144 </p>
1145 </li>
1146 <li>
1147 <p>
1148 At most three object names of the entry in stages from 1 to 3
1149     (nothing is written for a missing stage).
1150 </p>
1151 </li>
1152 </ul></div>
1153 </div>
1154 <div class="sect2">
1155 <h3 id="_split_index">Split index</h3>
1156 <div class="literalblock">
1157 <div class="content">
1158 <pre><code>In split index mode, the majority of index entries could be stored
1159 in a separate file. This extension records the changes to be made on
1160 top of that to produce the final index.</code></pre>
1161 </div></div>
1162 <div class="literalblock">
1163 <div class="content">
1164 <pre><code>The signature for this extension is { 'l', 'i', 'n', 'k' }.</code></pre>
1165 </div></div>
1166 <div class="literalblock">
1167 <div class="content">
1168 <pre><code>The extension consists of:</code></pre>
1169 </div></div>
1170 <div class="ulist"><ul>
1171 <li>
1172 <p>
1173 Hash of the shared index file. The shared index file path
1174     is $GIT_DIR/sharedindex.&lt;hash&gt;. If all bits are zero, the
1175     index does not require a shared index file.
1176 </p>
1177 </li>
1178 <li>
1179 <p>
1180 An ewah-encoded delete bitmap, each bit represents an entry in the
1181     shared index. If a bit is set, its corresponding entry in the
1182     shared index will be removed from the final index.  Note, because
1183     a delete operation changes index entry positions, but we do need
1184     original positions in replace phase, it&#8217;s best to just mark
1185     entries for removal, then do a mass deletion after replacement.
1186 </p>
1187 </li>
1188 <li>
1189 <p>
1190 An ewah-encoded replace bitmap, each bit represents an entry in
1191     the shared index. If a bit is set, its corresponding entry in the
1192     shared index will be replaced with an entry in this index
1193     file. All replaced entries are stored in sorted order in this
1194     index. The first "1" bit in the replace bitmap corresponds to the
1195     first index entry, the second "1" bit to the second entry and so
1196     on. Replaced entries may have empty path names to save space.
1197 </p>
1198 <div class="literalblock">
1199 <div class="content">
1200 <pre><code>The remaining index entries after replaced ones will be added to the
1201 final index. These added entries are also sorted by entry name then
1202 stage.</code></pre>
1203 </div></div>
1204 </li>
1205 </ul></div>
1206 </div>
1207 </div>
1208 </div>
1209 <div class="sect1">
1210 <h2 id="_untracked_cache">Untracked cache</h2>
1211 <div class="sectionbody">
1212 <div class="literalblock">
1213 <div class="content">
1214 <pre><code>Untracked cache saves the untracked file list and necessary data to
1215 verify the cache. The signature for this extension is { 'U', 'N',
1216 'T', 'R' }.</code></pre>
1217 </div></div>
1218 <div class="literalblock">
1219 <div class="content">
1220 <pre><code>The extension starts with</code></pre>
1221 </div></div>
1222 <div class="ulist"><ul>
1223 <li>
1224 <p>
1225 A sequence of NUL-terminated strings, preceded by the size of the
1226     sequence in variable width encoding. Each string describes the
1227     environment where the cache can be used.
1228 </p>
1229 </li>
1230 <li>
1231 <p>
1232 Stat data of $GIT_DIR/info/exclude. See "Index entry" section from
1233     ctime field until "file size".
1234 </p>
1235 </li>
1236 <li>
1237 <p>
1238 Stat data of core.excludesFile
1239 </p>
1240 </li>
1241 <li>
1242 <p>
1243 32-bit dir_flags (see struct dir_struct)
1244 </p>
1245 </li>
1246 <li>
1247 <p>
1248 Hash of $GIT_DIR/info/exclude. A null hash means the file
1249     does not exist.
1250 </p>
1251 </li>
1252 <li>
1253 <p>
1254 Hash of core.excludesFile. A null hash means the file does
1255     not exist.
1256 </p>
1257 </li>
1258 <li>
1259 <p>
1260 NUL-terminated string of per-dir exclude file name. This usually
1261     is ".gitignore".
1262 </p>
1263 </li>
1264 <li>
1265 <p>
1266 The number of following directory blocks, variable width
1267     encoding. If this number is zero, the extension ends here with a
1268     following NUL.
1269 </p>
1270 </li>
1271 <li>
1272 <p>
1273 A number of directory blocks in depth-first-search order, each
1274     consists of
1275 </p>
1276 </li>
1277 <li>
1278 <p>
1279 The number of untracked entries, variable width encoding.
1280 </p>
1281 </li>
1282 <li>
1283 <p>
1284 The number of sub-directory blocks, variable width encoding.
1285 </p>
1286 </li>
1287 <li>
1288 <p>
1289 The directory name terminated by NUL.
1290 </p>
1291 </li>
1292 <li>
1293 <p>
1294 A number of untracked file/dir names terminated by NUL.
1295 </p>
1296 </li>
1297 </ul></div>
1298 <div class="paragraph"><p>The remaining data of each directory block is grouped by type:</p></div>
1299 <div class="ulist"><ul>
1300 <li>
1301 <p>
1302 An ewah bitmap, the n-th bit marks whether the n-th directory has
1303     valid untracked cache entries.
1304 </p>
1305 </li>
1306 <li>
1307 <p>
1308 An ewah bitmap, the n-th bit records "check-only" bit of
1309     read_directory_recursive() for the n-th directory.
1310 </p>
1311 </li>
1312 <li>
1313 <p>
1314 An ewah bitmap, the n-th bit indicates whether hash and stat data
1315     is valid for the n-th directory and exists in the next data.
1316 </p>
1317 </li>
1318 <li>
1319 <p>
1320 An array of stat data. The n-th data corresponds with the n-th
1321     "one" bit in the previous ewah bitmap.
1322 </p>
1323 </li>
1324 <li>
1325 <p>
1326 An array of hashes. The n-th hash corresponds with the n-th "one" bit
1327     in the previous ewah bitmap.
1328 </p>
1329 </li>
1330 <li>
1331 <p>
1332 One NUL.
1333 </p>
1334 </li>
1335 </ul></div>
1336 </div>
1337 </div>
1338 <div class="sect1">
1339 <h2 id="_file_system_monitor_cache">File System Monitor cache</h2>
1340 <div class="sectionbody">
1341 <div class="literalblock">
1342 <div class="content">
1343 <pre><code>The file system monitor cache tracks files for which the core.fsmonitor
1344 hook has told us about changes.  The signature for this extension is
1345 { 'F', 'S', 'M', 'N' }.</code></pre>
1346 </div></div>
1347 <div class="literalblock">
1348 <div class="content">
1349 <pre><code>The extension starts with</code></pre>
1350 </div></div>
1351 <div class="ulist"><ul>
1352 <li>
1353 <p>
1354 32-bit version number: the current supported versions are 1 and 2.
1355 </p>
1356 </li>
1357 <li>
1358 <p>
1359 (Version 1)
1360     64-bit time: the extension data reflects all changes through the given
1361         time which is stored as the nanoseconds elapsed since midnight,
1362         January 1, 1970.
1363 </p>
1364 </li>
1365 <li>
1366 <p>
1367 (Version 2)
1368     A null terminated string: an opaque token defined by the file system
1369     monitor application.  The extension data reflects all changes relative
1370     to that token.
1371 </p>
1372 </li>
1373 <li>
1374 <p>
1375 32-bit bitmap size: the size of the CE_FSMONITOR_VALID bitmap.
1376 </p>
1377 </li>
1378 <li>
1379 <p>
1380 An ewah bitmap, the n-th bit indicates whether the n-th index entry
1381     is not CE_FSMONITOR_VALID.
1382 </p>
1383 </li>
1384 </ul></div>
1385 </div>
1386 </div>
1387 <div class="sect1">
1388 <h2 id="_end_of_index_entry">End of Index Entry</h2>
1389 <div class="sectionbody">
1390 <div class="literalblock">
1391 <div class="content">
1392 <pre><code>The End of Index Entry (EOIE) is used to locate the end of the variable
1393 length index entries and the beginning of the extensions. Code can take
1394 advantage of this to quickly locate the index extensions without having
1395 to parse through all of the index entries.</code></pre>
1396 </div></div>
1397 <div class="literalblock">
1398 <div class="content">
1399 <pre><code>Because it must be able to be loaded before the variable length cache
1400 entries and other index extensions, this extension must be written last.
1401 The signature for this extension is { 'E', 'O', 'I', 'E' }.</code></pre>
1402 </div></div>
1403 <div class="literalblock">
1404 <div class="content">
1405 <pre><code>The extension consists of:</code></pre>
1406 </div></div>
1407 <div class="ulist"><ul>
1408 <li>
1409 <p>
1410 32-bit offset to the end of the index entries
1411 </p>
1412 </li>
1413 <li>
1414 <p>
1415 Hash over the extension types and their sizes (but not
1416         their contents).  E.g. if we have "TREE" extension that is N-bytes
1417         long, "REUC" extension that is M-bytes long, followed by "EOIE",
1418         then the hash would be:
1419 </p>
1420 <div class="literalblock">
1421 <div class="content">
1422 <pre><code>Hash("TREE" + &lt;binary-representation-of-N&gt; +
1423         "REUC" + &lt;binary-representation-of-M&gt;)</code></pre>
1424 </div></div>
1425 </li>
1426 </ul></div>
1427 </div>
1428 </div>
1429 <div class="sect1">
1430 <h2 id="_index_entry_offset_table">Index Entry Offset Table</h2>
1431 <div class="sectionbody">
1432 <div class="literalblock">
1433 <div class="content">
1434 <pre><code>The Index Entry Offset Table (IEOT) is used to help address the CPU
1435 cost of loading the index by enabling multi-threading the process of
1436 converting cache entries from the on-disk format to the in-memory format.
1437 The signature for this extension is { 'I', 'E', 'O', 'T' }.</code></pre>
1438 </div></div>
1439 <div class="literalblock">
1440 <div class="content">
1441 <pre><code>The extension consists of:</code></pre>
1442 </div></div>
1443 <div class="ulist"><ul>
1444 <li>
1445 <p>
1446 32-bit version (currently 1)
1447 </p>
1448 </li>
1449 <li>
1450 <p>
1451 A number of index offset entries each consisting of:
1452 </p>
1453 </li>
1454 <li>
1455 <p>
1456 32-bit offset from the beginning of the file to the first cache entry
1457         in this block of entries.
1458 </p>
1459 </li>
1460 <li>
1461 <p>
1462 32-bit count of cache entries in this block
1463 </p>
1464 </li>
1465 </ul></div>
1466 </div>
1467 </div>
1468 <div class="sect1">
1469 <h2 id="_sparse_directory_entries">Sparse Directory Entries</h2>
1470 <div class="sectionbody">
1471 <div class="literalblock">
1472 <div class="content">
1473 <pre><code>When using sparse-checkout in cone mode, some entire directories within
1474 the index can be summarized by pointing to a tree object instead of the
1475 entire expanded list of paths within that tree. An index containing such
1476 entries is a "sparse index". Index format versions 4 and less were not
1477 implemented with such entries in mind. Thus, for these versions, an
1478 index containing sparse directory entries will include this extension
1479 with signature { 's', 'd', 'i', 'r' }. Like the split-index extension,
1480 tools should avoid interacting with a sparse index unless they understand
1481 this extension.</code></pre>
1482 </div></div>
1483 </div>
1484 </div>
1485 <div class="sect1">
1486 <h2 id="_git">GIT</h2>
1487 <div class="sectionbody">
1488 <div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
1489 </div>
1490 </div>
1491 </div>
1492 <div id="footnotes"><hr /></div>
1493 <div id="footer">
1494 <div id="footer-text">
1495 Last updated
1496  2024-02-08 15:45:59 PST
1497 </div>
1498 </div>
1499 </body>
1500 </html>