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Update documentation.

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Rob Landley 2006-03-13 04:38:40 +00:00
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61
INSTALL
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@ -16,9 +16,14 @@ Quick Start:
The easy way to try out BusyBox for the first time, without having to install
it, is to enable all features and then use "standalone shell" mode with a
blank command $PATH:
blank command $PATH.
make allyesconfig
To enable all features, use "make defconfig", which produces the largest
general-purpose configuration. (It's allyesconfig minus debugging options,
optional packaging choices, and a few special-purpose features requiring
extra configuration to use.)
make defconfig
make
PATH= ./busybox ash
@ -27,25 +32,34 @@ any built-in busybox applets directly, without looking for external
programs by that name. Supplying an empty command path (as above) means
the only commands busybox can find are the built-in ones.
(Note that the standalone shell requires the /proc directory to function.)
(Note that the standalone shell currently requires /proc/self/exe to
launch new applets.)
Configuring Busybox:
====================
Busybox is optimized for size, but enabling the full set of functionality
still results in a fairly large executable (more than 1 megabyte when
statically linked). To save space, busybox can be configured with only the
still results in a fairly large executable -- more than 1 megabyte when
statically linked. To save space, busybox can be configured with only the
set of applets needed for each environment. The minimal configuration, with
all applets disabled, produces a 4k executable. (It's useless, but very small.)
The manual configurators "make config" and "make menuconfig" modify the
existing configuration. Quick ways to get starting configurations include
"make allyesconfig" (enables almost all options), "make allnoconfig" (disables
all options), "make allbaseconfig" (enables all applets but disables all
optional features), and "make defconfig" (reset to defaults).
The manual configurator "make menuconfig" modifies the existing configuration.
(For systems without ncurses, try "make config" instead.) The two most
interesting starting configurations are "make allnoconfig" (to start with
everything disabled and add just what you need), and "make defconfig" (to
start with everything enabled and remove what you don't need). If menuconfig
is run without an existing configuration, make defconfig will run first to
create a known starting point.
Other starting configurations (mostly used for testing purposes) include
"make allbaseconfig" (enables all applets but disables all optional features),
"make allyesconfig" (enables absolutely everything including debug features),
and "make randconfig" (produce a random configuration).
Configuring BusyBox produces a file ".config", which can be saved for future
use.
use. Run "make oldconfig" to bring a .config file from an older version of
busybox up to date.
Installing Busybox:
===================
@ -72,37 +86,34 @@ also configure a standaone install capability into the busybox base applet,
and then install such links at runtime with one of "busybox --install" (for
hardlinks) or "busybox --install -s" (for symlinks).
If you built busybox as shared object which uses libbusybox.so and have not
yet installed the binary but want to run tests, then set your LD_LIBRARY_PATH
accordingly before running the executable:
If you enabled the busybox shared library feature (libbusybox.so) and want
to run tests without installing, set your LD_LIBRARY_PATH accordingly when
running the executable:
export LD_LIBRARY_PATH=`pwd`
./busybox
LD_LIBRARY_PATH=`pwd` ./busybox
Building out-of-tree:
=====================
By default, the BusyBox build puts its temporary files in the source tree.
Building from a read-only source tree, or to building multiple
configurations from the same source directory, requires the ability to
put the temporary files somewhere else.
Building from a read-only source tree, or building multiple configurations from
the same source directory, requires the ability to put the temporary files
somewhere else.
To build out of tree, cd to the empty directory and do this instead:
To build out of tree, cd to an empty directory and configure busybox from there:
make -f /path/to/source/Makefile allyesconfig
make -f /path/to/source/Makefile defconfig
make
make install
Alternately, use the O=$BUILDPATH option during the configuration step, as in:
Alternately, use the O=$BUILDPATH option (with an absolute path) during the
configuration step, as in:
make O=/some/empty/directory allyesconfig
cd /some/empty/directory
make
make PREFIX=. install
(Note, O= requires an absolute path.)
More Information:
=================