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<html>
<head>
<title>System Requirements</title>
</head>
<body>
<a name="System_Requirements"></a>
<a href="http://www.regexps.com">The Hackerlab at <code>regexps.com</code></a>
<h2 align=center>System Requirements</h2>
<small>
<b>up: </b><a href="arch.html#arch">arch</a></br>
<b>prev: </b><a href="introduction.html#Introducing_arch">Introducing arch</a></br>
</small>
<br>
<p>In order to use <code>arch</code>
, there are some software tools that you must
already have available. These don't necessarily need to be on your
<code>PATH</code>
-- <code>arch</code>
can use a separate <code>PATH</code>
if you need it to.
</p><p><strong><u>GNU Make</u></strong> You will need <code>GNU Make</code>
in order to build <code>arch</code>
.
</p><p><strong><u>GNU Tar</u></strong> You must have <code>GNU tar</code>
. More specificially, you must have
a version of tar that has options:
</p><pre>
-zcf F to create a gzip-compressed tar file called
F, where F may be `-', meaning to write
the tar file to the standard-output stream
</pre>
<pre>
-zxf F to extract files from a gzip-compressed tar
file called F, where F may be `-', meaning
to read the tar file from the standard-input
stream.
</pre>
<pre>
-T - This option reads a list of files from
standard input. Only those files are
read or written to the archive -- others
are ignored.
</pre>
<pre>
-m When extracting files, don't restore
modification times.
</pre>
<p><strong><u>GNU diff and GNU patch</u></strong> After much deliberation, I've decided to go
ahead and rely on the <strong>GNU</strong> versions of <code>diff</code>
and <code>patch</code>
.
Specifically, you need a version of <code>diff</code>
that can generate "unified
format" output (option <code>-u</code>
) and a version of <code>patch</code>
that
understands that format and that understand <code>--posix</code>
. (It would be
trivial to use "context diffs" and, thus, standard <code>diff</code>
and
<code>patch</code>
, however, unified diffs are much easier to read, and I'm
hoping that picking specific implementations of these critical
sub-components will help contribute to the long-term stability of
<code>arch</code>
.)
</p><p><strong><u>Standard Posix Shell Tools</u></strong> The package framework assumes that some
standard Posix shell tools are available on your system. At the
moment, <code>sh</code>
must be installed as <code>/bin/sh</code>
, but this will be
corrected in a future release:
</p><pre>
awk
cat
chmod
date
echo
find
fold
grep
head
ls
mkdir
printf
pwd
rm
sed
sh
tee
test
touch
tsort
wc
xargs
</pre>
<p><strong><u>ordinary -exec extension to find</u></strong> Your version of <code>find</code>
must be able to
expand <code>{}</code>
even in the context of a larger string. For example:
</p><pre>
find . -exec echo ">>>{}<<<" ";"
</pre>
<p>should print a list of all files and directories, surrounded by '>>>'
and '<<<'. <code>GNU find</code>
has this property as do, I believe, most
implementations. (Posix explicitly requires only that <code>{}</code>
be
expanded in isolation, leaving undefined the meaning of <code>{}</code>
when
embedded in a longer string.)
</p><p><strong><u>The null Device</u></strong> Your system must have <code>/dev/null</code>
. Output directed
to <code>/dev/null</code>
should simply disappear from the universe, in the usual
way.
</p><p><strong><u>The BSD column program -- maybe</u></strong> If the program <code>column</code>
is on your
<code>PATH</code>
(or the path being used by <code>arch</code>
), it should be a program
which formats its input into columns and, with the option <code>-x</code>
, fills
columns before rows. If this program isn't found, it won't be used.
</p>
<small><i>arch: The arch Revision Control System
</i></small><br>
<a href="http://www.regexps.com">The Hackerlab at <code>regexps.com</code></a>
</body>
|
