89 lines
3.6 KiB
Plaintext
89 lines
3.6 KiB
Plaintext
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CRUNCH 0.2 README 6/14/94
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Crunch is available via anonymous ftp to ftp.cs.umd.edu in
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pub/bsd/crunch-0.2.tar.gz
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WHAT'S NEW IN 0.2
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* The prototype awk script has been replaced by a more capable and
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hopefully more robust C program.
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* No fragile template makefiles or dependencies on the details of the
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bsd build environment.
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* You can build crunched binaries even with no sources on-line, you
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just need the .o files. Crunchgen still will try to figure out as
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much as possible on its own, but you can override its guessing by
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specifying the list of .o files explicitly.
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* Crunch itself has been bmake'd and some man pages written, so it
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should be ready to install.
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INTRODUCTION
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Crunch is a little package that helps create "crunched" binaries for use
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on boot, install, and fixit floppies. A crunched binary in this case is
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one where many programs have been linked together into one a.out file.
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The different programs are run depending on the value of argv[0], so
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hard links to the crunched binary suffice to simulate a perfectly normal
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system.
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As an example, I have created an 980K crunched "fixit" binary containing
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the following programs in their entirety:
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cat chmod cp date dd df echo ed expr hostname kill ln ls mkdir
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mt mv pwd rcp rm rmdir sh sleep stty sync test [ badsect chown
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clri disklabel dump rdump dmesg fdisk fsck halt ifconfig init
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mknod mount newfs ping reboot restore rrestore swapon umount
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ftp rsh sed telnet rlogin vi cpio gzip gunzip gzcat
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Note carefully: vi, cpio, gzip, ed, sed, dump/restore, some networking
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utilities, and the disk management utilities, all in a binary small
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enough to fit on a 1.2 MB root filesystem floppy (albeit with the kernel
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on its own boot floppy). A more reasonable subset can be made to fit
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easily with a kernel for a decent one-disk fixit filesystem.
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The linking together of different programs by hand is an old
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space-saving technique. Crunch automates the process by building the
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necessary stub files and makefile for you (via the crunchgen program),
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and by doctoring the symbol tables of the component .o files to allow
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them to link without "symbol multiply defined" conflicts (via the
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crunchide program).
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BUILDING CRUNCH
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Just type make, then make install.
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Crunch was written and tested under NetBSD/i386, but should work under
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other PC BSD systems that use GNU ld.
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The crunchgen(1) and crunchide(1) man pages have more details on using
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crunch, and the examples subdirectory contains some working .conf files
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and a sample Makefile.
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CREDITS
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Thanks to the NetBSD team for a consistently high quality effort in
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bringing together a solid, state of the art development environment.
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Thanks to the FreeBSD guys; Rod Grimes, Nate Williams and Jordan
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Hubbard; and to Bruce Evans, for immediate and detailed feedback on
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crunch 0.1, and for pressing me to make the prototype more useable.
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Crunch was written for the Maruti Hard Real-Time Operating System
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project at the University of Maryland, to help make for better install
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and recovery procedures for our NetBSD-based development environment. It
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is copyright (c) 1994 by the University of Maryland under a UCB-style
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freely- redistributable notice. See the file COPYRIGHT for details.
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Please let me know of any problems or of enhancements you make to this
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package. I'm particularly interested in the details of what you found
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was good to put on your fixit or install disks. Thanks!
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Share and Enjoy,
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Jaime
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............................................................................
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: Stand on my shoulders, : jds@cs.umd.edu : James da Silva
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: not on my toes. : uunet!mimsy!jds : http://www.cs.umd.edu/users/jds
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