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add work by Matthias S. Benkmann which is the inspiration for this project.
author Robert McIntyre <rlm@mit.edu>
date Tue, 08 Jan 2013 11:45:01 +0000
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0:0b7a589f6e9a 1:d6bef198ae71
1 #!/bin/bash
2 # Copyright (c) 2004 Matthias S. Benkmann <article AT winterdrache DOT de>
3 # You may do everything with this code except misrepresent its origin.
4 # PROVIDED `AS IS' WITH ABSOLUTELY NO WARRANTY OF ANY KIND!
5
6 #The following list should contain the mount points of all filesystems
7 #that are to be scanned as a space-separated list within parentheses.
8 #/ will usually be in this list and if you have /usr
9 #on a separate partition, it will also be in this list. Other non-special
10 #filesystems where package users could own files should also be put in this
11 #list.
12 #Mount points whose filesystems are special, such as procfs or sysfs must
13 #not be in this list. While a simple find on those special filesystems should
14 #be harmless, operations such as "-exec grep something" are NOT SAFE and may
15 #have HARMFUL SIDE-EFFECTS, especially when performed as root.
16 fs_to_scan=(/)
17
18 #Files with a path prefix found in the following list are ignored.
19 #This list will usually contain the parent directory of your package users'
20 #home directories, because normally you don't want to scan those. You can
21 #also add other directories that will never contain package user files, such
22 #as /home. This reduces scan time.
23 #NOTE: The LFS-6.0 book uses a ramfs mounted on /dev and with that setup
24 #/dev does not need to be in the prune list. But since there is no requirement
25 #that /dev have its on filesystem it's better to prune it explicitly.
26 prune_prefixes=(/home /usr/src /dev /tools) #NO TRAILING SLASHES!!!!
27
28 if [ $# -lt 1 -o "$1" = "--help" ]; then
29 echo 1>&2
30 echo 1>&2 'USAGE: '"${0##*/}"' <user_or_group_name> [<find-commands>]'
31 echo 1>&2
32 echo 1>&2 ' If <find-commands> contains no action other than -prune, -print will be'
33 echo 1>&2 ' executed for all matching files.'
34 echo 1>&2 ' Entries will be matched if group and/or user equals <user_or_group_name>'
35 echo 1>&2 ' (numeric UID/GID allowed).'
36 echo 1>&2 ' All matching entries will be acted on, including device special files, so'
37 echo 1>&2 ' you should be extra careful with the <find-commands> you provide!'
38 echo 1>&2
39 exit 1
40 fi
41
42 #suppress ugly debug output from shell
43 trap ':' SIGPIPE
44
45 ugname="$1"
46 shift 1 #remove user_or_group_name from argument list
47
48 # Recent versions of find issue a warning if "-depth" is listed after a
49 # non-option argument. To prevent this warning if -depth is passed to
50 # this script, we pick up the "-depth" argument here to move it to the
51 # front later on.
52 depth=""
53 if [ "_$1" = "_-depth" ]; then
54 depth=-depth
55 shift 1
56 fi
57
58 ugmatcher=(-false)
59 #test if find accepts ugname as a user, and append to ugmatcher if it does
60 if find / -maxdepth 0 -user "$ugname" >/dev/null 2>&1 ; then
61 ugmatcher[${#ugmatcher[@]}]="-or"
62 ugmatcher[${#ugmatcher[@]}]="-user"
63 ugmatcher[${#ugmatcher[@]}]="$ugname"
64 fi
65 #test if find accepts ugname as a group, and append to ugmatcher if it does
66 if find / -maxdepth 0 -group "$ugname" >/dev/null 2>&1 ; then
67 ugmatcher[${#ugmatcher[@]}]="-or"
68 ugmatcher[${#ugmatcher[@]}]="-group"
69 ugmatcher[${#ugmatcher[@]}]="$ugname"
70 fi
71
72 #if find accepted ugname as neither user nor group, then exit
73 if [ "${#ugmatcher[@]}" = 1 ]; then
74 echo 1>&2 'find does not accept `'"$ugname'"' as group or user name'
75 exit 1
76 fi
77
78 #construct find commands that match the prune_prefixes. Each prefix will be
79 #matched as -path <prefix> -or -path <prefix>/*
80 #so that the directory itself and all subdirectories are matched.
81 y=(\( -false)
82 for ((i=0; $i<${#prune_prefixes[@]}; i=$i+1))
83 do
84 y[${#y[@]}]='-or'
85 y[${#y[@]}]=-path
86 y[${#y[@]}]="${prune_prefixes[$i]}"
87 y[${#y[@]}]='-or'
88 y[${#y[@]}]=-path
89 y[${#y[@]}]="${prune_prefixes[$i]}/*"
90 done
91 y[${#y[@]}]=')'
92
93 #In the following find command, the part
94 # -not ( ( "${y[@]}" -prune ) -or "${y[@]}" )
95 #is responsible for preventing the files that match prune_prefixes from
96 #being processed. The 2nd "${y[@]}" may seem redundant, but it isn't, because
97 #-prune has no effect and is always false when -depth is used.
98 #The -true before "$@" ensures that -depth can be passed as only parameter.
99 find "${fs_to_scan[@]}" $depth -xdev -noleaf \
100 -not \( \( "${y[@]}" -prune \) -or "${y[@]}" \) \
101 -and \( "${ugmatcher[@]}" \) -and \( -true "$@" \)