1The /rescue build system here has three goals: 2 31) Produce a reliable standalone set of /rescue tools. 4 5The contents of /rescue are all statically linked and do not depend on 6anything in /bin or /sbin. In particular, they'll continue to 7function even if you've hosed your dynamic /bin and /sbin. For 8example, note that /rescue/mount runs /rescue/mount_nfs and not 9/sbin/mount_nfs. This is more subtle than it looks. 10 11As an added bonus, /rescue is fairly small (thanks to crunchgen) and 12includes a number of tools (such as gzip, bzip2, vi) that are not 13normally found in /bin and /sbin. 14 152) Demonstrate robust use of crunchgen. 16 17These Makefiles recompile each of the crunchgen components and include 18support for overriding specific library entries. Such techniques 19should be useful elsewhere. 20 213) Produce a toolkit suitable for small distributions. 22 23Install /rescue on a CD or CompactFlash disk, and symlink /bin and 24/sbin to /rescue to produce a small and fairly complete FreeBSD 25system. 26 27These tools have one big disadvantage: being statically linked, they 28cannot use some advanced library functions that rely on dynamic 29linking. In particular, nsswitch, locales, and pam all 30rely on dynamic linking. 31 32 33To compile: 34 35# cd /usr/src/rescue 36# make obj 37# make 38# make install 39 40Note that rebuilds don't always work correctly; if you run into 41trouble, try 'make clean' before recompiling. 42