Overview
| SHA1 Hash: | 452a71f40bf7c16d620a2a3d6bc729ebd8bc0e0a |
|---|---|
| Date: | 2007-08-26 03:03:58 |
| User: | drh |
| Comment: | Merge in aku's documentation updates. |
| Timelines: | ancestors | descendants | both | trunk |
| Other Links: | files | ZIP archive | manifest |
Tags And Properties
- branch=trunk inherited from [a28c83647d]
- sym-trunk inherited from [a28c83647d]
Changes
[hide diffs]Added art/delta1.dia version [1e1461fa6f]
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Added art/delta4.dia version [7184224cfa]
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Added art/delta5.dia version [42c52e3c7c]
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Added art/delta6.dia version [638abaa6b4]
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Box" version="0" id="O2"> + <dia:attribute name="obj_pos"> + <dia:point val="5,1"/> + </dia:attribute> + <dia:attribute name="obj_bb"> + <dia:rectangle val="4.95,0.95;7.05,3.05"/> + </dia:attribute> + <dia:attribute name="elem_corner"> + <dia:point val="5,1"/> + </dia:attribute> + <dia:attribute name="elem_width"> + <dia:real val="2"/> + </dia:attribute> + <dia:attribute name="elem_height"> + <dia:real val="2"/> + </dia:attribute> + <dia:attribute name="show_background"> + <dia:boolean val="true"/> + </dia:attribute> + </dia:object> + <dia:object type="Standard - Text" version="1" id="O3"> + <dia:attribute name="obj_pos"> + <dia:point val="5.44022,2.06397"/> + </dia:attribute> + <dia:attribute name="obj_bb"> + <dia:rectangle val="5.44022,1.50441;6.55978,2.49559"/> + </dia:attribute> + <dia:attribute name="text"> + <dia:composite type="text"> + <dia:attribute name="string"> + <dia:string>#"\n"#</dia:string> + </dia:attribute> + <dia:attribute name="font"> + <dia:font family="sans" style="0" name="Helvetica"/> + </dia:attribute> + <dia:attribute name="height"> + <dia:real val="0.80000000000000004"/> + </dia:attribute> + <dia:attribute name="pos"> + <dia:point val="5.44022,2.06397"/> + </dia:attribute> + <dia:attribute name="color"> + <dia:color val="#000000"/> + </dia:attribute> + <dia:attribute name="alignment"> + <dia:enum val="0"/> + </dia:attribute> + </dia:composite> + </dia:attribute> + <dia:attribute name="valign"> + <dia:enum val="3"/> + </dia:attribute> + </dia:object> + </dia:group> + </dia:group> + </dia:layer> +</dia:diagram>
Added todo-ak.txt version [660969788a]
@@ -1,1 +1,52 @@ +[Andreas Kupries] + +Things to work on: + +* Add a 'test' target to the makefile for easy invokation of the + fossil testsuite. + +* Think about exposure of functionality as libraries, i.e. Tcl + packages. Foundations like delta, etc. first, work up to + higher-levels. + +* Document delta format, delta encoder. + +* Document the merge algorithm. + +* Document the xfer protocol. + +General ideas: + +* Use TLS/SSL in the xfer module to enhance privacy of + communications. Integrity too, however that is also handled in the + fossil protocol itself. + + Possibility: OpenSSL. + Dis: Library is large, makes self-containment of fossil difficult. + Adv: Known library, proven? design/robustness/implementation? -> Marketing + + Possibility: Tcl 8.5+extended libtom* functionality + Dis: New implementation, less proven + Adv: More selfcontained. + + Possibility: lib-gnupg + Dis: + Adv: + +* Talk to Mark Roseman about his Projectforum system and its + suitability as the wiki component. And in reverse the possibility + of using Fossil as the version engine underneath ProjectForum. + +* Talk to Colin McCormack / Kevin Kenny about usability of Fossil as + version engine underneath Tcler's Wiki, and also for the wiki + itself. (Note: Chat message by kbk showed that he is aware of + fossil). + +Notes: + +* Stephen Huntley - tdelta (tclvfs, versioned filesystem, see also + http://wiki.tcl.tk/12803), compare against delta here. +* fts2 as is is difficult to use in fossil. Indexing currently + requires the blob data to be fully visible, counter to the extensive + use of compression (delta,zlib) in repositories.
Modified todo.txt from [f09c9b6d28] to [3d872fddda].
@@ -20,11 +20,11 @@
* Bug: pull is ending prematurely.
* Bug: Make sure merge and other commands (check-out) do not try
to use a phantom.
-
+¿
* The ipaddr field of the rcvfrom table is not being set. This
field should be the IP address from which information is received
for the local repository. So when somebody does a push of new
files we record the ipaddr. Or when we do a pull, we record
the ipaddr.
Modified www/concepts.html from [c70816f44a] to [8da6496b93].
@@ -10,11 +10,11 @@
<h2>1.0 Introduction</h2>
<p>
<a href="index.html">Fossil</a> is a
<a href="http://en.wikipedia.org/wiki/Software_configuration_management">
software configuration management</a> system.
-Fossil is software that is design to control and track the
+Fossil is software that is designed to control and track the
development of a software project and to record the history
of the project.
There are many such systems in use today. Fossil strives to
distinguish itself from the others by being extremely simple
to setup and operate.</p>
@@ -34,23 +34,23 @@
<p>A "repository" is a database that contains copies of all historical
versions or baselines for a project. Baselines are normally stored in the
repository in a highly space-efficient compressed format (delta encoding).
But that is an implementation detail that you the user need not worry over.
-Think of the repository as a safe place where all your old baselines
+Think of the repository as a safe place where all your old baselines are
securely stored away and available for retrieval whenever you need
them.</p>
<p>A repository in fossil is a single file on your disk. This file
-might be rather larger (dozens or hundreds of megabytes for a large
+might be rather large (dozens or hundreds of megabytes for a large
or long running project) but it is nevertheless just a file. You
can move it around, rename it, write it out to a memory stick, or
do anything else you normally do with files.</p>
<p>Each source tree that is controlled by fossil is associated with
-a single repository on the local disk drive. You can two or more
-source trees tied to a single repository if you want (though one
+a single repository on the local disk drive. You can tie two or more
+source trees to a single repository if you want (though one
tree per repository is the most common configuration.) So a
single repository can be associated with many source trees, but
each source tree is associated with only one repository.</p>
<p>Fossil source tree may not overlap. A fossil source tree is identified
@@ -69,12 +69,12 @@
source tree in which to work. Developers share their work by
"syncing" the content of their local repositories either directly
or through a central server. Changes can "push" from the local
repository into a remote repository. Or changes can "pull" from a
remote repository into a local repository. Or one can do a "sync"
-which is shortcut for doing both a push and a pull at the same time.
-Fossil also has the concept of "cloning". A "clone" is like a "pull"
+which is a shortcut for doing both a push and a pull at the same time.
+Fossil also has the concept of "cloning". A "clone" is like a "pull",
except that instead of beginning with an existing local repository,
a clone begins with nothing and creates a new local repository that
is a replicate of a remote repository.</p>
<p>Communication between repositories is via HTTP. Remote
@@ -86,13 +86,13 @@
<p>A particular version of a particular file is called an "artifact".
Each artifact has a universally unique name which is the
<a href="http://en.wikipedia.org/wiki/SHA">SHA1</a> hash of the content
of that file expressed as 40 characters of lower-case hexadecimal. Such
-such has is referred to as the Universally Unique Identifier or UUID
+a hash is referred to as the Universally Unique Identifier or UUID
for the artifact. The SHA1 algorithm is created with the purpose of
-provide a highly forgery-resistent identifier for a file. Given any
+providing a highly forgery-resistent identifier for a file. Given any
file it is simple to find the UUID for that file. But given a
UUID it is computationally intractable to generate a file that will
generate that UUID.</p>
@@ -137,11 +137,11 @@
with each check-in or commit is really just the UUID of the
manifest for that baseline.</p>
<p>Fossil automatically generates a manifest whenever you "commit"
a new baseline. So this is not something that you, the developer,
-need to worry with. The format of a manifest is intentially
+need to worry with. The format of a manifest is intentionally
designed to be simple to parse, however, so that if
you want to read and interpret a manifest, either by hand or
with a script, that is easy to do.</p>
<p>In addition to identifying all files in the baseline, a
@@ -160,28 +160,28 @@
<li>A <b>repository</b> keeps a record of historical baselines.</li>
<li>Repositories share their changes using <b>push</b>, <b>pull</b>,
<b>sync</b>, and <b>clone</b>.</li>
<li>A particular version of a particular file is an <b>artifact</b>
that is identified by a <b>UUID</b>.</li>
-<li>Artifacts tracked by fossil are inheriently immutable.</li>
+<li>Artifacts tracked by fossil are inherently immutable.</li>
<li>Fossil automatically generates a <b>manifest</b> file that identifies
every artifact in a baseline.</li>
<li>The UUID of the manifest is the UUID of the baseline.</li>
</ul>
<h2>3.0 Fossil - The Program</h2>
<p>Fossil is software. The implementation of fossil is in the form
-of a single executable name "fossil". To install fossil on your system,
+of a single executable named "fossil". To install fossil on your system,
all you have to do is obtain a copy of this one executable file (either
by downloading a precompiled version or compiling it yourself) and then
putting that file somewhere on your PATH.</p>
<p>Fossil is completely self-contained. It is not necessary to
install any other software in order to use fossil. You do <u>not</u> need
CVS, gzip, diff, rsync, Python, Perl, Tcl, Java, apache, PostgreSQL, MySQL,
-SQLite, Tcl, patch, or any similar software on your system in order to use
+SQLite, patch, or any similar software on your system in order to use
fossil effectively. You will want to have some kind of text editor
for entering check-in comments. Fossil will use whatever text editor
is identified by your VISUAL environment variable. Fossil will also
use GPG to clearsign your manifests if you happen to have it installed,
but fossil will skip that step if you do not have GPG so it is not
Added www/delta1.gif version [fc676aedbe]
cannot compute difference between binary files
Added www/delta2.gif version [305bcc0781]
cannot compute difference between binary files
Added www/delta3.gif version [ecdccfa728]
cannot compute difference between binary files
Added www/delta4.gif version [235b08d75c]
cannot compute difference between binary files
Added www/delta5.gif version [990001794f]
cannot compute difference between binary files
Added www/delta6.gif version [325bffc28f]
cannot compute difference between binary files
Added www/delta_format.html version [403bbf0aac]
@@ -1,1 +1,221 @@ +<html> +<head> +<title>Fossil Delta Format</title> +</head> +<body bgcolor="white"> +<h1 align="center"> +Fossil Delta Format +</h1> + +<p>A key component for the efficient storage of multiple revisions of +a file in fossil repositories is the use of delta-compression, i.e. to +store only the changes between revisions instead of the whole +file.</p> + +<p>This document describes the format used to encode such changes, +also known as "delta". It is targeted at developers working on either +<a href="index.html">fossil</a> itself, or on tools compatible with +it.</p> + +<h2>Structure</h2> +<img src="delta1.gif" align="left" hspace="10"> + +<p>A delta consists of three parts, a "header", a "trailer", and a +"segment-list" between them.</p> + +<p>Both header and trailer provide information about the target +helping the decoder, and the segment-list describes how the target can +be constructed from the original.</p> + +<h3>Header</h3> +<img src="delta6.gif" align="left" hspace="10"> + +<p>The header consists of a single number followed by a newline +character (ASCII 0x0a). The number is the length of the target in +bytes.</p> + +<p>This means that, given a delta, the decoder can compute the size of +the target (and allocate any necessary memory based on that) by simply +reading the first line of the delta and decoding the number found +there. In other words, before it has to decode everything else.</p> + +<h3>Trailer</h3> +<img src="delta5.gif" align="left" hspace="10"> + +<p>The trailer consists of a single number followed by a semicolon (ASCII +0x3b). This number is a checksum of the target and can be used by a +decoder to verify that the delta applied correctly, reconstructing the +target from the original.</p> + +<p>The checksum is computed by treating the target as a series of +32-bit integer numbers (MSB first), and summing these up, modulo +2^32-1. A target whose length is not a multiple of 4 is padded with +0-bytes (ASCII 0x00) at the end.</p> + +<p>By putting this information at the end of the delta a decoder has +it available immediately after the target has been reconstructed +fully.</p> + +<h3>Segment-List</h3> +<img src="delta2.gif" align="left" hspace="10"> + +<p>The segment-list of a delta describes how to create the target from +the original by a combination of inserting literal byte-sequences and +copying ranges of bytes from the original. This is there the +compression takes place, by encoding the large common parts of +original and target in small copy instructions.</p> + +<p>The target is constructed from beginning to end, with the data +generated by each instruction appended after the data of all previous +instructions, with no gaps.</p> + +<h4>Insert Literal</h4> + +<p>A literal is specified by two elements, the size of the literal in +bytes, and the bytes of the literal itself.</p> + +<img src="delta4.gif" align="left" hspace="10"> +<p>The length is written first, followed by a colon character (ASCII +0x3a), followed by the bytes of the literal.</p> + +<h4>Copy Range</h4> + +<p>A range to copy is specified by two numbers, the offset of the +first byte in the original to copy, and the size of the range, in +bytes. The size zero is special, its usage indicates that the range +extends to the end of the original.</p> + +<img src="delta3.gif" align="left" hspace="10"> +<p>The length is written first, followed by an "at" character (ASCII +0x40), then the offset, followed by a comma (ASCII 0x2c).</p> + +<h2>Encoding of integers</h2> + +<p> +The format currently handles only 32 bit integer numbers. They are +written base-64 encoded, MSB first, and without leading +"0"-characters, except if they are significant (i.e. 0 => "0"). +</p> + +<p> +The base-64 coding is described in +<a href="http://www.ietf.org/rfc/rfc3548.txt">RFC 3548</a>. +</p> + +<h2>Examples</h2> + +<h3>Number encoding</h3> + +<table border=1> +<tr> +<th>Value</th> +<th>Encoding</th> +</tr> +<tr> +<td>0</td> +<td>0</td> +</tr> +<tr> +<td>6246</td> +<td>1Xb</td> +</tr> +<tr> +<td>-1101438770</td> +<td>2zMM3E</td> +</tr> +</table> + +<h3>Delta</h3> + +<p>An example of a delta using the specified encoding is:</p> + +<table border=1><tr><td><pre> +1Xb +4E@0,2:thFN@4C,6:scenda1B@Jd,6:scenda5x@Kt,6:pieces79@Qt,F: Example: eskil~E@Y0,2zMM3E;</pre> +</td></tr></table> + +<p>This can be taken apart into the following parts:</p> + +<table border=1> +<tr><th>What </th> <th>Encoding </th><th>Meaning </th><th>Details</th></tr> +<tr><td>Header</td> <td>1Xb </td><td>Size </td><td> 6246 </td></tr> +<tr><td>S-List</td> <td>4E@0, </td><td>Copy </td><td> 270 @ 0 </td></tr> +<tr><td> </td> <td>2:th </td><td>Literal </td><td> 2 'th' </td></tr> +<tr><td> </td> <td>FN@4C, </td><td>Copy </td><td> 983 @ 268 </td></tr> +<tr><td> </td> <td>6:scenda </td><td>Literal </td><td> 6 'scenda' </td></tr> +<tr><td> </td> <td>1B@Jd, </td><td>Copy </td><td> 75 @ 1256 </td></tr> +<tr><td> </td> <td>6:scenda </td><td>Literal </td><td> 6 'scenda' </td></tr> +<tr><td> </td> <td>5x@Kt, </td><td>Copy </td><td> 380 @ 1336 </td></tr> +<tr><td> </td> <td>6:pieces </td><td>Literal </td><td> 6 'pieces' </td></tr> +<tr><td> </td> <td>79@Qt, </td><td>Copy </td><td> 457 @ 1720 </td></tr> +<tr><td> </td> <td>F: Example: eskil</td><td>Literal </td><td> 15 ' Example: eskil'</td></tr> +<tr><td> </td> <td>~E@Y0, </td><td>Copy </td><td> 4046 @ 2176 </td></tr> +<tr><td>Trailer</td><td>2zMM3E </td><td>Ckecksum</td><td> -1101438770 </td></tr> +</table> + +<p>The unified diff behind the above delta is</p> + +<table border=1><tr><td><pre> +bluepeak:(761) ~/Projects/Tcl/Fossil/Devel/devel > diff -u ../DELTA/old ../DELTA/new +--- ../DELTA/old 2007-08-23 21:14:40.000000000 -0700 ++++ ../DELTA/new 2007-08-23 21:14:33.000000000 -0700 +@@ -5,7 +5,7 @@ + + * If the server does not have write permission on the database + file, or on the directory containing the database file (and +- it is thus unable to update database because it cannot create ++ it is thus unable to update the database because it cannot create + a rollback journal) then it currently fails silently on a push. + It needs to return a helpful error. + +@@ -27,8 +27,8 @@ + * Additional information displayed for the "vinfo" page: + + + All leaves of this version that are not included in the +- decendent list. With date, user, comment, and hyperlink. +- Leaves in the decendent table should be marked as such. ++ descendant list. With date, user, comment, and hyperlink. ++ Leaves in the descendant table should be marked as such. + See the compute_leaves() function to see how to find all + leaves. + + Add file diff links to the file change list. +@@ -37,7 +37,7 @@ + + * The /xfer handler (for push, pull, and clone) does not do + delta compression. This results in excess bandwidth usage. +- There are some code in xfer.c that are sketches of ideas on ++ There are some pieces in xfer.c that are sketches of ideas on + how to do delta compression, but nothing has been implemented. + + * Enhancements to the diff and tkdiff commands in the cli. +@@ -45,7 +45,7 @@ + single file. Allow diffs against any two arbitrary versions, + not just diffs against the current check-out. Allow + configuration options to replace tkdiff with some other +- visual differ of the users choice. ++ visual differ of the users choice. Example: eskil. + + * Ticketing interface (expand this bullet) + +</pre></td></tr></table> + + + +<h2>Notes</h2> + +<ul> +<li>Pure text files generate a pure text delta. +</li> +<li>Binary files generate a delta that may contain some binary data. +</li> +<li>Instead of putting special instructions for general compression +into the delta-format itself, specifically the segment-list, like +run-length encoding of literals, etc. it was considered to be much +more sensible to keep the various concern separate and use a general +compression library, like <a href="http://www.zlib.net">zlib</a>, to +compress the full delta after its generation. +</li> +</ul> +</body> +</html>
Modified www/index.html from [62a56c4597] to [7006a635c1].
@@ -86,9 +86,11 @@ <li><a href="pop.html">Principals Of Operation</a></li> <li>The <a href="selfcheck.html">automatic self-check</a> mechanism helps insure project integrity.</li> <li>The <a href="fileformat.html">file format</a> used by every content file stored in the repository.</li> +<li>The <a href="delta_format.html">format of deltas</a> used to +efficiently store changes between file revisions.</li> </ul> </body> </html>