Dear cfengine people,
I know that the usage of Exec* functions with convoluted shell
oneliners is not a sign of good cfengine practices, but I do want to use
them from time to time, and period breakages of what was working before
annoyed me previously, and now I just couldn't make old lines working
as before... I spent good few hours playing around but that is
enough...
I'm running Debian sid with cfengine2 2.1.20-1 now.
To overcome all issues with Exec*Result being illogical, not well
documented to make sense of the syntax, I wrote a tiny wrapper:
#!/bin/bash
# BUCK QUOTE BACK PIPE SEMI
dict='@B@:$ @Q@:" @A@:\\ @P@:| @S@:;'
args="$@"
for pair in $dict;
do
key=${pair%:*}
value=${pair#*:}
args=$(echo $args | sed -e "s/$key/$value/g")
done
bash -c "$args"
Now, from within cfengine config files I have lines like:
RCSRev = ( ExecResult("/usr/local/sbin/shh echo $Revision: 1.17 $ @P@
/usr/bin/cut -f2 [EMAIL PROTECTED]@ @Q@") )
RCSFile = ( ExecResult("/usr/local/sbin/shh echo $RCSfile: cf.main,v $ @P@
/usr/bin/cut -f2 [EMAIL PROTECTED]@ @Q@") )
outiface = ( ExecResult("/usr/local/sbin/shh route -n @P@ awk
@Q@/^0.0.0.0/{print @A@@[EMAIL PROTECTED]@[EMAIL PROTECTED]@Q@") )
lociface = ( ExecResult("/usr/local/sbin/shh route -n @P@ awk
@Q@/^10.0.0.0/{print @A@@[EMAIL PROTECTED]@[EMAIL PROTECTED]@Q@") )
Yes -- they are convoluted but
a. I hope them to survive through unexpected changes in cfengine handing
of the arguments to Exec*
b. I can easily debug such calls from the command line
c. I can easily expand the dictionary to accommodate other symbols (I
bet I might need () )
I just wanted to share... you might say that it is a very nasty way to
do things, and there might be a cleaner way, but I gave up -- nice
howto/standard might resolve the ambiguity.
--
Yaroslav Halchenko
Research Assistant, Psychology Department, Rutgers-Newark
Office: (973) 353-5440x263 | FWD: 82823 | Fax: (973) 353-1171
101 Warren Str, Smith Hall, Rm 4-105, Newark NJ 07102
Student Ph.D. @ CS Dept. NJIT
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