Embedding a RCS token in uname -i

[Karl Vogel]

>> On Tue, 21 Jun 2011 20:21:46 -0600 (MDT), 
>> Dennis Glatting <freebsd at penx.com> said:

D> My goal is to provide a mechanism where I can identify that kernels
D> built on a group of machines are running the same kernel built from a
D> configuration under RCS.  How can I customized the current config and
D> build mechanisms to accomplish this?

   Make your changes to the file GENERIC.in, run a small script to create
   GENERIC with the stuff you want, and then do your build.

D> Is it a dumb idea?

   I don't think so.  See below for one way to do it; the script includes a
   sanity check to make sure your build config file has been checked in.

-- 
Karl Vogel                      I don't speak for the USAF or my company
Mr. Rogers was an ordained minister.        --item for a lull in conversation

---------------------------------------------------------------------------
me% cat -n GENERIC.in
  1  # $Revision: 1.2 $ $Date: 2011/06/22 18:13:14 $
  2  
  3  cpu             HAMMER
  4  ident           GENERIC
  5  ...

me% ./mkgen

me% cat -n GENERIC
  1  # THIS FILE WAS AUTOMATICALLY GENERATED.  GENERIC.in is under
  2  # revision control, so please make your changes there.
  3  #
  4  # $Revision: 1.2 $ $Date: 2011/06/22 18:13:14 $
  5  
  6  cpu             HAMMER
  7  ident           GENERIC-1.2-20110622
  8  ...

me% cat mkgen
#!/bin/ksh
#<mkgen: Get version and date info from GENERIC.in, write GENERIC

export PATH=/usr/local/bin:/bin:/usr/bin
in=GENERIC.in
out=GENERIC

if rcsdiff -q $in > /dev/null; then
    echo updating $out
else
    echo $in needs to be checked in
    exit 0
fi

nawk -v ifile=$in 'BEGIN {
    warn1 = "# THIS FILE WAS AUTOMATICALLY GENERATED. "
    warn2 = "# revision control, so please make your changes there.\n#"
  }
  {
    if ($0 ~ /Revision:/) {
       print warn1, ifile, "is under"
       print warn2
       print
       gsub("/"," ")
       id = sprintf("%s-%s%s%s", $3, $6, $7, $8)
  }
  else if ($0 ~ /^ident/) { print $0 "-" id }
  else print

}' $in > $out

exit 0