Kernel Version Control

2007-12-25 7:28:00

As I mentioned before, most of what came out of my research into

performing some kind of kernel version control had to do with

installing some control in the procedure used to generate kernels.

First, we began using RCS to keep track of kernel configuration files,

embedding RCS $Revision strings into the 'ident' statement with

something like:

ident "SERVER$Revision$"

You just have to be careful to make sure that the 'ident' strings does

not have spaces after it is co'ed through RCS because /etc/config will

reject it.

The second major step we took was to use RCS to keep track of kernel

objects, while I didn't find a way to embed strings into the objects,

we chose the next best things which was to embed bogus strings into the

kernel. This was done with a modification to

/usr/kvm/sys/conf.common/newvers.sh

When I receive object patches from Sun, I would install them in the

following manner:

Let's say for example that is was locore.o that needed to be replaced.

This is how I would install it:

cp $LOC/locore.o /sys/sun4c/OBJ/locore.o.p100000-01 # copy with patch number

cd /sys/sun4c/OBJ

rm locore.o

ln -s locore.o.p100000-01 locore.o

This would leave an audit trail. The newvers.sh script that I

modified looks fo these symbolic links and generates a dummy C data

structure so that when I build the kernel and do an 'ident' on it, I

get something like:

$Id: ip_input.o -> ip_input.o.p100149-03 $

$Id: kern_descrip.o -> kern_descrip.o.p100075-06 $

$Id: klm_lockmgr.o -> klm_lockmgr.o.p100075-06 $

$Id: locore.o -> locore.o.p100232-01 $

Here is my version of /usr/kvm/sys/conf.common/newvers.sh

# $Header: /home/users/kernel/sys/conf.common/RCS/newvers.sh,v 1.3 1991/10/08 06:37:59 kernel Exp $

# $Log: newvers.sh,v $

# Revision 1.3 1991/10/08 06:37:59 kernel

# Added code to insert version of configuration file

# Added code to build dummy rcsid string with indications of patched

# objects

# Revision 1.2 1991/10/07 17:12:23 kernel

# Added RCS identification string

# called by: newvers.sh <release_file> <arch>

PATH=/usr/ucb:/bin:/usr/bin

if [ ! -r version ]; then echo 0 > version; fi

touch version

VERS=`expr \`cat version\` + 1`

OS="SunOS"

# Temporary workaround - partial initialization of uname "SunOS" string

# because some install scripts assume single "SunOS" in kernel.

# X_OS to be replaced by OS later

X_OS="sunOS"

ARCH=$2

# Truncate release field to 8 chars in utsname

RELEASE=`expr \`cat $1\` : '$..\{0,7\}$'`

echo '#include <sys/utsname.h>' > vers.c

echo >> vers.c

SNAME=`basename \`pwd\``

SLINE=`grep "^ident" ../conf/$SNAME | awk '{print $2}' | sed 's/"//g'`

echo $VERS $SLINE `cat $1` | \

awk ' { version = $1; system = $2; release = $3; }\

END { printf "char version[] = \"SunOS Release %s (%s) #%d: ", release, system, version >> "vers.c";\

printf "%d\n", version > "version"; }'

echo >> vers.c

# Initialize the utsname structure

echo $X_OS $RELEASE $VERS $ARCH | \

awk ' { sysname = $1; release = $2; version = $3; arch = $4; }\

END { printf "struct utsname utsname =\n\t{ \"%s\", \"\", \"\", \"%s\", \"%s\", \"%s\" };\n\n", \

sysname, release, version, arch >> "vers.c" ; } '

# Create dummy variable containing identification for patched objects

(cd ../OBJ; echo 'static char *rcsid[] = {'; ls -l *.o | grep lrwx | \

cut -c46-500 | sed 's/^/ "\$Id: /' | \

sed 's/$/ \$",/'; echo '""};') >> vers.c

Actived: 0 answers; - size: 4139 bytes; - view related info - Similar thread

Comments

Got something to say?

You must be logged in to post a comment.

thatsjava.com

Kernel Version Control

Comments