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269 lines
8.6 KiB
Groff
269 lines
8.6 KiB
Groff
.\"
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.\" Copyright (c) 1994 University of Maryland
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.\" All Rights Reserved.
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.\"
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.\" Permission to use, copy, modify, distribute, and sell this software and its
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.\" documentation for any purpose is hereby granted without fee, provided that
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.\" the above copyright notice appear in all copies and that both that
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.\" copyright notice and this permission notice appear in supporting
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.\" documentation, and that the name of U.M. not be used in advertising or
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.\" publicity pertaining to distribution of the software without specific,
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.\" written prior permission. U.M. makes no representations about the
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.\" suitability of this software for any purpose. It is provided "as is"
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.\" without express or implied warranty.
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.\"
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.\" U.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL U.M.
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.\" BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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.\" IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.\" Author: James da Silva, Systems Design and Analysis Group
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.\" Computer Science Department
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.\" University of Maryland at College Park
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.\"
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.Dd June 14, 1994
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.Dt CRUNCHGEN 1
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.Os BSD 4
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.Sh NAME
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.Nm \&crunchgen
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.Nd generates build environment for a crunched binary
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.Sh SYNOPSIS
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.Nm \&crunchgen
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.Op Fl fql
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.Op Fl m Ar makefile-name
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.Op Fl c Ar c-file-name
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.Op Fl e Ar exec-file-name
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.Op Ar conf-file
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.Sh DESCRIPTION
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A crunched binary is a program made up of many other programs linked
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together into a single executable. The crunched binary main()
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function determines which component program to run by the contents of
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argv[0]. The main reason to crunch programs together is for fitting
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as many programs as possible onto an installation or system recovery
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floppy.
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.Pp
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.Nm Crunchgen
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reads in the specifications in
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.Ar conf-file
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for a crunched binary, and generates a Makefile and accompanying
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top-level C source file that when built create the crunched executable
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file from the component programs. For each component program,
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.Nm crunchgen
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can optionally attempt to determine the object (.o) files that make up
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the program from its source directory Makefile. This information is
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cached between runs.
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.Nm Crunchgen
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uses the companion program
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.Nm crunchide
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to eliminate link-time conflicts between the component programs by
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hiding all unnecessary symbols.
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.Pp
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After
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.Nm crunchgen
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is run, the crunched binary can be built by running ``make -f
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<conf-name>.mk''. The component programs' object files must already
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be built. A ``objs'' target, included in the output makefile, will
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run make in each component program's source dir to build the object
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files for the user. This is not done automatically since in release
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engineering circumstances it is generally not desireable to be
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modifying objects in other directories.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl c Ar c-file-name
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Set output C file name to
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.Ar c-file-name .
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The default name is ``<conf-name>.c''.
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.It Fl e Ar exec-file-name
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Set crunched binary executable file name to
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.Ar exec-file-name .
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The default name is ``<conf-name>''.
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.It Fl f
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Flush cache. Forces the recalculation of cached parameters.
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.It Fl l
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List names. Lists the names this binary will respond to.
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.It Fl m Ar makefile-name
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Set output Makefile name to
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.Ar makefile-name .
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The default name is ``<conf-name>.mk''.
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.It Fl q
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Quiet operation. Status messages are suppressed.
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.El
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.Sh CRUNCHGEN CONFIGURATION FILE COMMANDS
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.Nm Crunchgen
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reads specifications from the
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.Ar conf-file
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that describe the components of the crunched binary. In its simplest
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use, the component program names are merely listed along with the
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top-level source directories in which their sources can be found.
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.Nm Crunchgen
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then calculates (via the source makefiles) and caches the
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list of object files and their locations. For more specialized
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situations, the user can specify by hand all the parameters that
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.Nm crunchgen
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needs.
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.Pp
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The
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.Ar conf-file
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commands are as follows:
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.Bl -tag -width indent
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.It Nm srcdirs Ar dirname ...
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A list of source trees in which the source directories of the
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component programs can be found. These dirs are searched using the
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BSD ``<source-dir>/<progname>/'' convention. Multiple
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.Nm srcdirs
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lines can be specified. The directories are searched in the order
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they are given.
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.It Nm progs Ar progname ...
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A list of programs that make up the crunched binary. Multiple
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.Nm progs
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lines can be specified.
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.It Nm libs Ar libspec ...
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A list of library specifications to be included in the crunched binary link.
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Multiple
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.Nm libs
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lines can be specified.
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.It Nm ln Ar progname linkname
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Causes the crunched binary to invoke
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.Ar progname
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whenever
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.Ar linkname
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appears in argv[0]. This allows programs that change their behavior when
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run under different names to operate correctly.
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.El
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To handle specialized situations, such as when the source is not
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available or not built via a conventional Makefile, the following
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.Nm special
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commands can be used to set
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.Nm crunchgen
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parameters for a component program.
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.Bl -tag -width indent
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.It Nm special Ar progname Nm srcdir Ar pathname
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Set the source directory for
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.Ar progname .
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This is normally calculated by searching the specified
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.Nm srcdirs
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for a directory named
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.Ar progname .
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.It Nm special Ar progname Nm objdir Ar pathname
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Set the obj directory for
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.Ar progname .
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This is normally calculated by looking for a directory named
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.Dq Pa obj
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under the
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.Ar srcdir ,
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and if that is not found, the
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.Ar srcdir
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itself becomes the
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.Ar objdir .
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.It Nm special Ar progname Nm objs Ar object-file-name ...
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Set the list of object files for program
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.Ar progname .
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This is normally calculated by constructing a temporary makefile that includes
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.Dq Nm srcdir / Pa Makefile
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and outputs the value of $(OBJS).
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.It Nm special Ar progname Nm objpaths Ar full-pathname-to-object-file ...
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Sets the pathnames of the object files for program
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.Ar progname .
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This is normally calculated by prepending the
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.Nm objdir
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pathname to each file in the
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.Nm objs
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list.
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.El
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.Pp
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Only the
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.Nm objpaths
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parameter is actually needed by
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.Nm crunchgen ,
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but it is calculated from
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.Nm objdir
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and
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.Nm objs ,
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which are in turn calculated from
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.Nm srcdir ,
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so is sometimes convenient to specify the earlier parameters and let
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.Nm crunchgen
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calculate forward from there if it can.
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.Pp
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The makefile produced by
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.Nm crunchgen
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contains an optional
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.Ar objs
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target that will build the object files for each component program by
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running make inside that program's source directory. For this to work the
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.Nm srcdir
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and
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.Nm objs
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parameters must also be valid. If they are not valid for a particular program, that
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program is skipped in the
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.Ar objs
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target.
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.Sh EXAMPLE
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Here is an example
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.Nm crunchgen
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input conf file, named
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.Dq Pa kcopy.conf :
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.Pp
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.nf
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srcdirs /usr/src/bin /usr/src/sbin
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progs test cp echo sh fsck halt init mount umount myinstall
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ln test [ # test can be invoked via [
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ln sh -sh # init invokes the shell with "-sh" in argv[0]
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special myprog objpaths /homes/leroy/src/myinstall.o # no sources
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libs -lutil -lcrypt
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.fi
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.Pp
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This conf file specifies a small crunched binary consisting of some
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basic system utilities plus a homegrown install program ``myinstall'',
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for which no source directory is specified, but its object file is
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specified directly with the
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.Nm special
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line.
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.Pp
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The crunched binary ``kcopy'' can be built as follows:
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.Pp
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.nf
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% crunchgen -m Makefile kcopy.conf # gen Makefile and kcopy.c
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% make objs # build the component progams' .o files
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% make # build the crunched binary kcopy
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% kcopy sh # test that this invokes a sh shell
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$ # it works!
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.fi
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.Pp
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At this point the binary ``kcopy'' can be copied onto an install floppy
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and hard-linked to the names of the component programs.
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.Sh SEE ALSO
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.Xr crunchide 1
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.Sh CAVEATS
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While
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.Nm crunch
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takes care to eliminate link conflicts between the component programs
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of a crunched binary, conflicts are still possible between the
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libraries that are linked in. Some shuffling in the order of
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libraries may be required, and in some rare cases two libraries may
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have an unresolveable conflict and thus cannot be crunched together.
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.Pp
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Some versions of the BSD build environment do not by default build the
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intermediate object file for single-source file programs. The ``make
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objs'' target must then be used to get those object files built, or
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some other arrangements made.
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.Sh AUTHOR
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.Nm Crunch
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was written by James da Silva <jds@cs.umd.edu>.
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.sp 0
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Copyright (c) 1994 University of Maryland. All Rights Reserved.
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