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<!--
Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 The SCons Foundation
Permission is hereby granted, free of charge, to any person obtaining
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"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-->
<para>
Once a program is built,
it is often appropriate to install it in another
directory for public use.
You use the &Install; method
to arrange for a program, or any other file,
to be copied into a destination directory:
</para>
<programlisting>
env = Environment()
hello = env.Program('hello.c')
env.Install('/usr/bin', hello)
</programlisting>
<para>
Note, however, that installing a file is
still considered a type of file "build."
This is important when you remember that
the default behavior of &SCons; is
to build files in or below the current directory.
If, as in the example above,
you are installing files in a directory
outside of the top-level &SConstruct; file's directory tree,
you must specify that directory
(or a higher directory, such as <literal>/</literal>)
for it to install anything there:
</para>
<screen>
% <userinput>scons -Q</userinput>
cc -o hello.o -c hello.c
cc -o hello hello.o
% <userinput>scons -Q /usr/bin</userinput>
Install file: "hello" as "/usr/bin/hello"
</screen>
<para>
It can, however, be cumbersome to remember
(and type) the specific destination directory
in which the program (or any other file)
should be installed.
This is an area where the &Alias;
function comes in handy,
allowing you, for example,
to create a pseudo-target named <literal>install</literal>
that can expand to the specified destination directory:
</para>
<programlisting>
env = Environment()
hello = env.Program('hello.c')
env.Install('/usr/bin', hello)
env.Alias('install', '/usr/bin')
</programlisting>
<para>
This then yields the more natural
ability to install the program
in its destination as follows:
</para>
<screen>
% <userinput>scons -Q</userinput>
cc -o hello.o -c hello.c
cc -o hello hello.o
% <userinput>scons -Q install</userinput>
Install file: "hello" as "/usr/bin/hello"
</screen>
<section>
<title>Installing Multiple Files in a Directory</title>
<para>
You can install multiple files into a directory
simply by calling the &Install; function multiple times:
</para>
<programlisting>
env = Environment()
hello = env.Program('hello.c')
goodbye = env.Program('goodbye.c')
env.Install('/usr/bin', hello)
env.Install('/usr/bin', goodbye)
env.Alias('install', '/usr/bin')
</programlisting>
<para>
Or, more succinctly, listing the multiple input
files in a list
(just like you can do with any other builder):
</para>
<programlisting>
env = Environment()
hello = env.Program('hello.c')
goodbye = env.Program('goodbye.c')
env.Install('/usr/bin', [hello, goodbye])
env.Alias('install', '/usr/bin')
</programlisting>
<para>
Either of these two examples yields:
</para>
<screen>
% <userinput>scons -Q install</userinput>
cc -o goodbye.o -c goodbye.c
cc -o goodbye goodbye.o
Install file: "goodbye" as "/usr/bin/goodbye"
cc -o hello.o -c hello.c
cc -o hello hello.o
Install file: "hello" as "/usr/bin/hello"
</screen>
</section>
<section>
<title>Installing a File Under a Different Name</title>
<para>
The &Install; method preserves the name
of the file when it is copied into the
destination directory.
If you need to change the name of the file
when you copy it, use the &InstallAs; function:
</para>
<programlisting>
env = Environment()
hello = env.Program('hello.c')
env.InstallAs('/usr/bin/hello-new', hello)
env.Alias('install', '/usr/bin')
</programlisting>
<para>
This installs the <literal>hello</literal>
program with the name <literal>hello-new</literal>
as follows:
</para>
<screen>
% <userinput>scons -Q install</userinput>
cc -o hello.o -c hello.c
cc -o hello hello.o
Install file: "hello" as "/usr/bin/hello-new"
</screen>
</section>
<section>
<title>Installing Multiple Files Under Different Names</title>
<para>
Lastly, if you have multiple files that all
need to be installed with different file names,
you can either call the &InstallAs; function
multiple times, or as a shorthand,
you can supply same-length lists
for both the target and source arguments:
</para>
<programlisting>
env = Environment()
hello = env.Program('hello.c')
goodbye = env.Program('goodbye.c')
env.InstallAs(['/usr/bin/hello-new',
'/usr/bin/goodbye-new'],
[hello, goodbye])
env.Alias('install', '/usr/bin')
</programlisting>
<para>
In this case, the &InstallAs; function
loops through both lists simultaneously,
and copies each source file into its corresponding
target file name:
</para>
<screen>
% <userinput>scons -Q install</userinput>
cc -o goodbye.o -c goodbye.c
cc -o goodbye goodbye.o
Install file: "goodbye" as "/usr/bin/goodbye-new"
cc -o hello.o -c hello.c
cc -o hello hello.o
Install file: "hello" as "/usr/bin/hello-new"
</screen>
</section>
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