applying patches

[Roman Duka <rduka at mail dot ru>]

Hey guys, i thought i might share with you on how to write a script 
which will apply most patches
Sometimes when you issue "patch" command, you need to specify "-p<num>" 
argument, where <num> is usually 0 or 1. The problem is you're can't be 
sure which <num> will be successful. So here is a little loop which 
resolves this problem (i had to rewrite it slightly just now, so there 
might be a few errors, test it first, however i've just looked at it 
several times and it seems fine)

#look for files that contain pattern "patch" after a dot
for i in `ls $SRCDIR/patches/$patchdir/*.*patch*`
do
    #make sure it's a regular file and not a directory or anything else
    if test -f $i
    then
        success=no
        echo "Trying patch file: $i"
        for pnum in 0 1 2 3 4 5
        do
            #trying each number up to 5
            patch -p$pnum -f --dry-run < $i > /dev/null
            if test $? -eq 0
            then
                patch -p$pnum -f < $i
                success=yes
                break
            fi
        done
        if test x$success = xno
        then
            echo "Patch failed: $i"
        fi
    fi
done


Hope this will make it easy for you to apply all sorts of patches 
automatically in your shell scripts



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