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</head>
<body class="manpage">
<div id="header">
<h1>gitformat-commit-graph(5) Manual Page</h1>
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<p>gitformat-commit-graph - Git commit-graph format</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content">$GIT_DIR/objects/info/commit-graph
$GIT_DIR/objects/info/commit-graphs/*</pre>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The Git commit-graph stores a list of commit OIDs and some associated
metadata, including:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>The generation number of the commit.</p>
</li>
<li>
<p>The root tree OID.</p>
</li>
<li>
<p>The commit date.</p>
</li>
<li>
<p>The parents of the commit, stored using positional references within
the graph file.</p>
</li>
<li>
<p>The Bloom filter of the commit carrying the paths that were changed between
the commit and its first parent, if requested.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>These positional references are stored as unsigned 32-bit integers
corresponding to the array position within the list of commit OIDs. Due
to some special constants we use to track parents, we can store at most
(1 &lt;&lt; 30) + (1 &lt;&lt; 29) + (1 &lt;&lt; 28) - 1 (around 1.8 billion) commits.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_commit_graph_files_have_the_following_format">Commit-graph files have the following format:</h2>
<div class="sectionbody">
<div class="paragraph">
<p>In order to allow extensions that add extra data to the graph, we organize
the body into "chunks" and provide a binary lookup table at the beginning
of the body. The header includes certain values, such as number of chunks
and hash type.</p>
</div>
<div class="paragraph">
<p>All multi-byte numbers are in network byte order.</p>
</div>
<div class="sect2">
<h3 id="_header">HEADER:</h3>
<div class="literalblock">
<div class="content">
<pre>4-byte signature:
    The signature is: {'C', 'G', 'P', 'H'}</pre>
</div>
</div>
<div class="literalblock">
<div class="content">
<pre>1-byte version number:
    Currently, the only valid version is 1.</pre>
</div>
</div>
<div class="literalblock">
<div class="content">
<pre> 1-byte Hash Version
     We infer the hash length (H) from this value:
1 =&gt; SHA-1
2 =&gt; SHA-256
     If the hash type does not match the repository's hash algorithm, the
     commit-graph file should be ignored with a warning presented to the
     user.</pre>
</div>
</div>
<div class="literalblock">
<div class="content">
<pre>1-byte number (C) of "chunks"</pre>
</div>
</div>
<div class="literalblock">
<div class="content">
<pre>1-byte number (B) of base commit-graphs
    We infer the length (H*B) of the Base Graphs chunk
    from this value.</pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_chunk_lookup">CHUNK LOOKUP:</h3>
<div class="literalblock">
<div class="content">
<pre>(C + 1) * 12 bytes listing the table of contents for the chunks:
    First 4 bytes describe the chunk id. Value 0 is a terminating label.
    Other 8 bytes provide the byte-offset in current file for chunk to
    start. (Chunks are ordered contiguously in the file, so you can infer
    the length using the next chunk position if necessary.) Each chunk
    ID appears at most once.</pre>
</div>
</div>
<div class="literalblock">
<div class="content">
<pre>The CHUNK LOOKUP matches the table of contents from
the chunk-based file format, see linkgit:gitformat-chunk[5]</pre>
</div>
</div>
<div class="literalblock">
<div class="content">
<pre>The remaining data in the body is described one chunk at a time, and
these chunks may be given in any order. Chunks are required unless
otherwise specified.</pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_chunk_data">CHUNK DATA:</h3>
<div class="sect3">
<h4 id="_oid_fanout_id_o_i_d_f_256_4_bytes">OID Fanout (ID: {<em>O</em>, <em>I</em>, <em>D</em>, <em>F</em>}) (256 * 4 bytes)</h4>
<div class="literalblock">
<div class="content">
<pre>The ith entry, F[i], stores the number of OIDs with first
byte at most i. Thus F[255] stores the total
number of commits (N).</pre>
</div>
</div>
</div>
<div class="sect3">
<h4 id="_oid_lookup_id_o_i_d_l_n_h_bytes">OID Lookup (ID: {<em>O</em>, <em>I</em>, <em>D</em>, <em>L</em>}) (N * H bytes)</h4>
<div class="literalblock">
<div class="content">
<pre>The OIDs for all commits in the graph, sorted in ascending order.</pre>
</div>
</div>
</div>
<div class="sect3">
<h4 id="_commit_data_id_c_d_a_t_n_h_16_bytes">Commit Data (ID: {<em>C</em>, <em>D</em>, <em>A</em>, <em>T</em> }) (N * (H + 16) bytes)</h4>
<div class="ulist">
<ul>
<li>
<p>The first H bytes are for the OID of the root tree.</p>
</li>
<li>
<p>The next 8 bytes are for the positions of the first two parents
of the ith commit. Stores value 0x70000000 if no parent in that
position. If there are more than two parents, the second value
has its most-significant bit on and the other bits store an array
position into the Extra Edge List chunk.</p>
</li>
<li>
<p>The next 8 bytes store the topological level (generation number v1)
of the commit and
the commit time in seconds since EPOCH. The generation number
uses the higher 30 bits of the first 4 bytes, while the commit
time uses the 32 bits of the second 4 bytes, along with the lowest
2 bits of the lowest byte, storing the 33rd and 34th bit of the
commit time.</p>
</li>
</ul>
</div>
</div>
<div class="sect3">
<h4 id="_generation_data_id_g_d_a_2_n_4_bytes_optional">Generation Data (ID: {<em>G</em>, <em>D</em>, <em>A</em>, <em>2</em> }) (N * 4 bytes) [Optional]</h4>
<div class="ulist">
<ul>
<li>
<p>This list of 4-byte values store corrected commit date offsets for the
commits, arranged in the same order as commit data chunk.</p>
</li>
<li>
<p>If the corrected commit date offset cannot be stored within 31 bits,
the value has its most-significant bit on and the other bits store
the position of corrected commit date into the Generation Data Overflow
chunk.</p>
</li>
<li>
<p>Generation Data chunk is present only when commit-graph file is written
by compatible versions of Git and in case of split commit-graph chains,
the topmost layer also has Generation Data chunk.</p>
</li>
</ul>
</div>
</div>
<div class="sect3">
<h4 id="_generation_data_overflow_id_g_d_o_2_optional">Generation Data Overflow (ID: {<em>G</em>, <em>D</em>, <em>O</em>, <em>2</em> }) [Optional]</h4>
<div class="ulist">
<ul>
<li>
<p>This list of 8-byte values stores the corrected commit date offsets
for commits with corrected commit date offsets that cannot be
stored within 31 bits.</p>
</li>
<li>
<p>Generation Data Overflow chunk is present only when Generation Data
chunk is present and atleast one corrected commit date offset cannot
be stored within 31 bits.</p>
</li>
</ul>
</div>
</div>
<div class="sect3">
<h4 id="_extra_edge_list_id_e_d_g_e_optional">Extra Edge List (ID: {<em>E</em>, <em>D</em>, <em>G</em>, <em>E</em>}) [Optional]</h4>
<div class="literalblock">
<div class="content">
<pre>This list of 4-byte values store the second through nth parents for
all octopus merges. The second parent value in the commit data stores
an array position within this list along with the most-significant bit
on. Starting at that array position, iterate through this list of commit
positions for the parents until reaching a value with the most-significant
bit on. The other bits correspond to the position of the last parent.</pre>
</div>
</div>
</div>
<div class="sect3">
<h4 id="_bloom_filter_index_id_b_i_d_x_n_4_bytes_optional">Bloom Filter Index (ID: {<em>B</em>, <em>I</em>, <em>D</em>, <em>X</em>}) (N * 4 bytes) [Optional]</h4>
<div class="ulist">
<ul>
<li>
<p>The ith entry, BIDX[i], stores the number of bytes in all Bloom filters
from commit 0 to commit i (inclusive) in lexicographic order. The Bloom
filter for the i-th commit spans from BIDX[i-1] to BIDX[i] (plus header
length), where BIDX[-1] is 0.</p>
</li>
<li>
<p>The BIDX chunk is ignored if the BDAT chunk is not present.</p>
</li>
</ul>
</div>
</div>
<div class="sect3">
<h4 id="_bloom_filter_data_id_b_d_a_t_optional">Bloom Filter Data (ID: {<em>B</em>, <em>D</em>, <em>A</em>, <em>T</em>}) [Optional]</h4>
<div class="ulist">
<ul>
<li>
<p>It starts with header consisting of three unsigned 32-bit integers:</p>
<div class="ulist">
<ul>
<li>
<p>Version of the hash algorithm being used. We currently only support
value 1 which corresponds to the 32-bit version of the murmur3 hash
implemented exactly as described in
<a href="https://en.wikipedia.org/wiki/MurmurHash#Algorithm" class="bare">https://en.wikipedia.org/wiki/MurmurHash#Algorithm</a> and the double
hashing technique using seed values 0x293ae76f and 0x7e646e2 as
described in <a href="https://doi.org/10.1007/978-3-540-30494-4_26" class="bare">https://doi.org/10.1007/978-3-540-30494-4_26</a> "Bloom Filters
in Probabilistic Verification"</p>
</li>
<li>
<p>The number of times a path is hashed and hence the number of bit positions
that cumulatively determine whether a file is present in the commit.</p>
</li>
<li>
<p>The minimum number of bits <em>b</em> per entry in the Bloom filter. If the filter
contains <em>n</em> entries, then the filter size is the minimum number of 64-bit
words that contain n*b bits.</p>
</li>
</ul>
</div>
</li>
<li>
<p>The rest of the chunk is the concatenation of all the computed Bloom
filters for the commits in lexicographic order.</p>
</li>
<li>
<p>Note: Commits with no changes or more than 512 changes have Bloom filters
of length one, with either all bits set to zero or one respectively.</p>
</li>
<li>
<p>The BDAT chunk is present if and only if BIDX is present.</p>
</li>
</ul>
</div>
</div>
<div class="sect3">
<h4 id="_base_graphs_list_id_b_a_s_e_optional">Base Graphs List (ID: {<em>B</em>, <em>A</em>, <em>S</em>, <em>E</em>}) [Optional]</h4>
<div class="literalblock">
<div class="content">
<pre>This list of H-byte hashes describe a set of B commit-graph files that
form a commit-graph chain. The graph position for the ith commit in this
file's OID Lookup chunk is equal to i plus the number of commits in all
base graphs.  If B is non-zero, this chunk must exist.</pre>
</div>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_trailer">TRAILER:</h3>
<div class="literalblock">
<div class="content">
<pre>H-byte HASH-checksum of all of the above.</pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_historical_notes">Historical Notes:</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The Generation Data (GDA2) and Generation Data Overflow (GDO2) chunks have
the number <em>2</em> in their chunk IDs because a previous version of Git wrote
possibly erroneous data in these chunks with the IDs "GDAT" and "GDOV". By
changing the IDs, newer versions of Git will silently ignore those older
chunks and write the new information without trusting the incorrect data.</p>
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<h2 id="_git">GIT</h2>
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<p>Part of the <a href="git.html">git(1)</a> suite</p>
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Last updated 2024-05-31 00:41:06 UTC
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Zerion Mini Shell 1.0