Date: Thu, 29 Jul 2004 08:28:05 -0700 (PDT) From: William Kirkland <bill@wek4.com> To: freebsd-hackers@freebsd.org Subject: Kernel Configuration script [was Re: "Next Generation" kernel configuration?] Message-ID: <200407291528.i6TFS59t016221@wek4.com>
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On Tue, Jul 20, 2004 at 07:39:31PM -0500, Conrad J. Sabatier wrote: > Just musing on an idea here: > > I've been thinking for a while now about trying to write a tool to make > kernel configuration easier, sort of a "make config" (as in ports) for > the kernel, similar to what's available on some of the Linux distros. Ok, I have attached some scripts I wrote, to make my life simpler. Though I do have some concerns that one should write their own, or use the existing structure and tools. I am willing to show what I use and share ideas. If you choose to use this, please give credit where it is due. As I have never previously published this, nor anything else. I find the GNU GPL (http://www.gnu.org/copyleft/gpl.html) acceptable. Use at your own risk. My scripts parces the boot information from /var/log/messages, then builds a kernel configuration file from that and a configuration file. I have, just now, written a brief overview of what is done and am willing to provide more information if you ask. I suppose I could even clean it up a bit and write proper documentation. The profile is a bit overly complex, though I use it for a number of other scripts as well. Sufice it to say, it searches (based upon the PATH environmental variable, replacing "/bin:" and "/sbin:" with "/etc:" for an appropriate configuration file (one that has the script name, minus an optional .sh and appending a .cfg, as a sufix). Once the file is found, appropriate variables are set. The performance can be enhanced by setting the "grep" variable, so that only the relevent boot entries are parced, or copying the message file somewhere else, then setting the "boot" variable to point to that file. Options and and device entries are included if a reference is found for them in the /var/log/messages file. The exclude and include configuration variables, modify this behavior, in that the script does not find references for everything in the boot record, and also finds references to things I do not use. You should probably uncomment line 34, and verify the results, prior to using. For that matter, there are a number of other things you should understand prior to use (review it before you use it!). #! /bin/sh #- -r-xr-xr-x 1 root wheel 1285 May 9 20:20 /wek/bin/kernel.sh . /wek/bin/_profile if [ ! -f "${_kernel_dst}" ]; then grep -E "${_kernel_grep:-.*}" ${_kernel_boot:-/var/log/messages} >${tmp} awk -v K=${_kernel} -v B=${tmp} -v P=${_kernel_prefix} \ -v I="${_kernel_include}" -v X="${_kernel_exclude}" ' BEGIN { while( getline <B ) { if ( $0 ~ P && $5 == "kernel:" && $6 ~ "[0-9]:$" ) { sub( "[0-9]:$", "", $6 ); D[$6]++ } } z=split( I, Z ); for( i=1; i<=z; i++ ) { d=Z[i]; D[d]++ } z=split( X, Z ); for( i=1; i<=z; i++ ) { d=Z[i]; D[d]=0 } } /^[ # ]*ident[ ]/ { printf( "ident %s\n", K ); next } /^[ # ]*device[ ]/ { sub( "^[ # ]*", "" ) sub( "[ ]*$", "" ) if ( D[$2] == 0 ) { printf( "#- %s\n", $0 ) } else { printf( "%s #=%d\n", $0, D[$2] ) } next } /^[ # ]*(options|cpu)[ ]/ { if ( D[$2] != "" ) { sub( "^[ # ]*", "" ) sub( "[ ]*$", "" ) if ( D[$2] == 0 ) { printf( "#- %s\n", $0 ) } else { printf( "%s #=%d\n", $0, D[$2] ) } next } } /./ { print }' <${_kernel_src:-/dev/null} >${_kernel_dst} if [ -f "${_kernel_add}" ]; then cat ${_kernel_add} >>${_kernel_dst} fi rm -f ${tmp} 2>/dev/null #- exit fi ( uname -a; date; set -o xtrace printenv | grep "^_${P}" | sort cd /usr/src && make -i depend \ && make buildkernel KERNCONF=${_kernel} \ && make installkernel KERNCONF=${_kernel} ) 2>&1 | tee ${_kernel_log} #- -r--r--r-- 1 operator wheel 126 Apr 23 15:50 /wek/etc/kernel.add #- options FAST_IPSEC # new IPsec options IPSEC options IPSEC_ESP options IPFIREWALL options IPDIVERT options DUMMYNET #- -r--r--r-- 1 operator wheel 372 May 9 13:59 /wek/etc/kernel.cfg wek-* boot=/tmp/boot boot=/var/log/messages src=/usr/src/sys/$( uname -m )/conf/GENERIC dst=/usr/src/sys/$( uname -m )/conf/${_kernel} include="atadisk atapicd atapifd atapist random loop ether pty md bpf miibus gif sis" exclude="INET6 MD_ROOT NFS_ROOT I486_CPU I586_CPU SMP plip" add=${home}/etc/${P}.add log=${home}/log/${_kernel} #! /bin/sh #- -rw-r--r-- 1 root wheel 742 May 11 14:39 /wek/bin/_profile P=$( basename ${0%.*} ) export home=/wek export tmp=/tmp/$$ export log=/tmp/${P}-$( date "+%y%m%d" ) for T in $( echo ${PATH}:${home}/etc \ | sed 's|/[s]*bin:|/etc |g' | tr ":" " " ); do if [ -z "${cfg}" -a -r ${T}/${P}.cfg ]; then cfg=${T}/${P}.cfg fi done awk -F = -v P=${P} -v M="${1:-$( date '+wek-%y%m%d' )}" ' /^[^ ]/ { ok=0; if ( M ~ $1 ) { print "export _" P "=" M; ok=1; next } } /^[ ]+[A-Z0-9a-z_]*[ ]*=/ { if ( ok ) { gsub( "^[ ]*", "export _" P "_" ); print } }' ${cfg:-/dev/null} >${tmp} . ${tmp} && rm ${tmp} export PATH=${home}/bin:${PATH}
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