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01e293f1 | 1 | #!/usr/bin/perl |
4c599711 WD |
2 | # This script takes a command-line arg of a source directory |
3 | # that will be passed to rsync, and generates a set of excludes | |
4 | # that will exclude all mount points from the list. This is | |
5 | # useful if you have "bind" mounts since the --one-file-system | |
6 | # option won't notice the transition to a different spot on | |
7 | # the same disk. For example: | |
8 | # | |
9 | # mnt-excl /dir | rsync --exclude-from=- ... /dir /dest/ | |
10 | # mnt-excl /dir/ | rsync --exclude-from=- ... /dir/ /dest/ | |
026deaf7 | 11 | # ssh host mnt-excl /dir | rsync --exclude-from=- ... host:/dir /dest/ |
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12 | # |
13 | # Imagine that /dir/foo is a mount point: the first invocation of | |
14 | # mnt-excl would have output /dir/foo, while the second would have | |
15 | # output /foo (which are the properly anchored excludes). | |
16 | # | |
17 | # NOTE: This script expects /proc/mounts to exist, but could be | |
18 | # easily adapted to read /etc/mtab or similar. | |
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19 | # |
20 | # ADDENDUM: The addition of the --filter option (which has support for | |
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21 | # absolute-anchored excludes) can make this screen unneeded in some |
22 | # scenarios. If you don't need delete protection on the receiving side | |
23 | # (or if the destination path is identical to the source path), then you | |
24 | # can exclude some absolute paths from the transfer based on the mount | |
25 | # dirs. For instance: | |
62586267 | 26 | # |
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27 | # awk '{print $2}' /proc/mounts | grep -v '^/$' | \ |
28 | # rsync -avf 'merge,/- -' /dir host:/dest/ | |
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29 | |
30 | use strict; | |
01e293f1 | 31 | use warnings; |
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32 | use Cwd 'abs_path'; |
33 | ||
3d54c6ec | 34 | my $file = '/proc/mounts'; |
4c599711 | 35 | my $dir = shift || '/'; |
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36 | my $trailing_slash = $dir =~ m{./$} ? '/' : ''; |
37 | $dir = abs_path($dir) . $trailing_slash; | |
38 | $dir =~ s{([^/]*)$}{}; | |
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39 | my $trailing = $1; |
40 | $trailing = '' if $trailing eq '.' || !-d "$dir$trailing"; | |
41 | $trailing .= '/' if $trailing ne ''; | |
42 | ||
3d54c6ec | 43 | open(IN, $file) or die "Unable to open $file: $!\n"; |
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44 | while (<IN>) { |
45 | $_ = (split)[1]; | |
53e6507e | 46 | next unless s{^\Q$dir$trailing\E}{}o && $_ ne ''; |
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47 | print "- /$trailing$_\n"; |
48 | } | |
49 | close IN; |