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1 #!/bin/bash
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2 # Copyright (c) 2004 Matthias S. Benkmann <article AT winterdrache DOT de>
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3 # You may do everything with this code except misrepresent its origin.
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4 # PROVIDED `AS IS' WITH ABSOLUTELY NO WARRANTY OF ANY KIND!
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5
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6 #The following list should contain the mount points of all filesystems
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7 #that are to be scanned as a space-separated list within parentheses.
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8 #/ will usually be in this list and if you have /usr
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9 #on a separate partition, it will also be in this list.
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10 #Mount points whose filesystems are special, such as procfs or sysfs must
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11 #not be in this list. While a simple find on those special filesystems should
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12 #be harmless, operations such as "-exec grep something" are NOT SAFE and may
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13 #have HARMFUL SIDE-EFFECTS, especially when performed as root.
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14 fs_to_scan=(/)
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15
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16 #Files with a path prefix found in the following list are ignored. As the
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17 #main function of this script is to help you find files that contain
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18 #hardwired paths to /tools or other unwanted references to
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19 #your build system, you will usually prune any directories that don't contain
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20 #files of interest, such as /tools (whose files naturally refer to /tools)
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21 #and your package users' home directories (which may also test positive if
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22 #you have unpacked and configured sources lying around).
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23 #NOTE: The LFS-6.0 book uses a ramfs mounted on /dev and with that setup
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24 #/dev does not need to be in the prune list. But since there is no requirement
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25 #that /dev have its on filesystem it's better to prune it explicitly.
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26 prune_prefixes=(/home /usr/src /dev /tools) #NO TRAILING SLASHES!!!
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27
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28 if [ $# -lt 1 -o "$1" = "--help" ]; then
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29 echo 1>&2
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30 echo 1>&2 'USAGE: '"${0##*/}"' <grep-commands>'
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31 echo 1>&2
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32 echo 1>&2 ' grep -l <grep-commands> -- <file>'
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33 echo 1>&2 ' will be executed for each *regular file* <file>'
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34 echo 1>&2 ' ATTENTION! If you override the -l switch with a switch that makes grep'
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35 echo 1>&2 ' output all individual matches rather than just the matching files,'
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36 echo 1>&2 ' then DO NOT redirect output to a file that is in a directory that will be'
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37 echo 1>&2 ' scanned, or you risk creating an endless loop that will cause your'
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38 echo 1>&2 ' output file to grow till your disk is full.'
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39 echo 1>&2
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40 exit 1
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41 fi
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42
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43 #suppress ugly debug output from shell
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44 trap ':' SIGPIPE
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45
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46 #construct find commands that match the prune_prefixes. Each prefix will be
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47 #matched as -path <prefix> -or -path <prefix>/*
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48 #so that the directory itself and all subdirectories are matched.
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49 y=(\( -false)
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50 for ((i=0; $i<${#prune_prefixes[@]}; i=$i+1))
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51 do
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52 y[${#y[@]}]='-or'
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53 y[${#y[@]}]=-path
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54 y[${#y[@]}]="${prune_prefixes[$i]}"
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55 y[${#y[@]}]='-or'
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56 y[${#y[@]}]=-path
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57 y[${#y[@]}]="${prune_prefixes[$i]}/*"
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58 done
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59 y[${#y[@]}]=')'
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60
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61 cmd_pre=(-type f -exec grep -l)
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62 cmd_post=(-- {} \;)
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63
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64 #In the following find command, the part
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65 # -not ( ( "${y[@]}" -prune ) -or "${y[@]}" )
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66 #is responsible for preventing the files that match prune_prefixes from
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67 #being processed. The 2nd "${y[@]}" may seem redundant, but it isn't, because
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68 #-prune has no effect and is always false when -depth is used (which someone
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69 #might do in the future).
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70 #The -true before "$@" ensures that -depth can be passed as 1st parameter
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71 #of $cmd_pre (should someone change it in the future).
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72 find "${fs_to_scan[@]}" -xdev -noleaf \
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73 -not \( \( "${y[@]}" -prune \) -or "${y[@]}" \) \
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74 -and \( -true "${cmd_pre[@]}" "$@" "${cmd_post[@]}" \)
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