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More documentation for miniconfig.sh.
author Rob Landley <rob@landley.net>
date Sat, 01 May 2010 14:15:53 -0500
parents 8de4598dfe46
children e948f92964b5
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1 #!/bin/bash
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2
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3 # miniconfig.sh copyright 2005 by Rob Landley <rob@landley.net>
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4 # Licensed under the GNU General Public License version 2.
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5
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6 # Run this in the linux kernel build directory with a starting file, and
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7 # it creates a file called mini.config with all the redundant lines of that
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8 # .config removed. The starting file must match what the kernel outputs.
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9 # If it doesn't, then run "make oldconfig" on it to get one that does.
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10
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11 # A miniconfig file is essentially the list of symbols you'd have to switch
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12 # on if you started from "allnoconfig" and then went through menuconfig
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13 # selecting what you wanted. It's just the list of symbols you're interested
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14 # in, without including the ones set automatically by dependency checking.
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15
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16 # To use a miniconfig: make allnoconfig KCONFIG_ALLCONFIG=/path/to/mini.conf
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17
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18 # Miniconfig is more easily human-readable than a full .config file, and in
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19 # some ways more version-independent than full .config files. On the other
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20 # hand, when you update to a new kernel it won't get default values for newly
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21 # created symbols (they'll be off if they didn't exist before and thus weren't
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22 # in your "I need this and this and this" checklist), which can cause problems.
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23
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24 # See sources/more/migrate_kernel.sh for a script that expands a miniconfig
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25 # to a .config under an old kernel version, copies it to a new version,
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26 # runs "make oldconfig" to update it, creates a new mini.config from the
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27 # result, and then shows a diff so you can see whether you want the new symbols.
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28
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29 export KCONFIG_NOTIMESTAMP=1
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30
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31 if [ $# -ne 1 ]
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32 then
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33 echo "Usage: miniconfig.sh configfile"
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34 exit 1
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35 fi
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36
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37 if [ ! -f "$1" ]
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38 then
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39 echo "Couldn't find "'"'"$1"'"'
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40 exit 1
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41 fi
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42
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43 if [ "$1" == ".config" ]
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44 then
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45 echo "It overwrites .config, rename it and try again."
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46 exit 1
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47 fi
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48
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49 make allnoconfig KCONFIG_ALLCONFIG="$1" > /dev/null
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50 # Shouldn't need this, but kconfig goes "boing" at times...
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51 yes "" | make oldconfig > /dev/null
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52 if ! cmp .config "$1"
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53 then
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54 echo Sanity test failed, normalizing starting configuration...
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55 diff -u "$1" .config
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56 fi
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57 cp .config .big.config
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58
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59 # Speed heuristic: remove all blank/comment lines
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60 grep -v '^[#$]' .config | grep -v '^$' > mini.config
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61 # This should never fail, but kconfig is so broken it does sometimes.
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62 make allnoconfig KCONFIG_ALLCONFIG=mini.config > /dev/null
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63 if ! cmp .config "$1"
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64 then
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65 echo Insanity test failed: reversing blank line removal heuristic.
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66 cp .big.config mini.config
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67 fi
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68 #cp .config mini.config
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70 echo "Calculating mini.config..."
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72 LENGTH=`cat mini.config | wc -l`
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73 OLDLENGTH=$LENGTH
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75 # Loop through all lines in the file
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76 I=1
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77 while true
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78 do
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79 if [ $I -gt $LENGTH ]
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80 then
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81 break
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82 fi
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83 sed -n "${I}!p" mini.config > .config.test
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84 # Do a config with this file
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85 rm .config
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86 make allnoconfig KCONFIG_ALLCONFIG=.config.test | head -n 1000000 > /dev/null
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87 # Compare. Because we normalized at the start, the files should be identical.
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88 if cmp -s .config .big.config
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89 then
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90 mv .config.test mini.config
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91 LENGTH=$[$LENGTH-1]
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92 else
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93 I=$[$I + 1]
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94 fi
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95 echo -n -e "\r$[$I-1]/$LENGTH lines $(cat mini.config | wc -c) bytes $[100-((($LENGTH-$I)*100)/$OLDLENGTH)]% "
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96 done
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97 rm .big.config
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98 echo