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46 lines
1.6 KiB
Perl
Executable File
46 lines
1.6 KiB
Perl
Executable File
#!/usr/bin/perl
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# This script takes a command-line arg of a source directory
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# that will be passed to rsync, and generates a set of excludes
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# that will exclude all mount points from the list. This is
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# useful if you have "bind" mounts since the --one-file-system
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# option won't notice the transition to a different spot on
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# the same disk. For example:
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#
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# mnt-excl /dir | rsync --exclude-from=- ... /dir /dest/
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# mnt-excl /dir/ | rsync --exclude-from=- ... /dir/ /dest/
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# ssh host mnt-excl /dir | rsync --exclude-from=- ... host:/dir /dest/
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#
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# Imagine that /dir/foo is a mount point: the first invocation of
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# mnt-excl would have output /dir/foo, while the second would have
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# output /foo (which are the properly anchored excludes).
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#
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# NOTE: This script expects /proc/mounts to exist, but could be
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# easily adapted to read /etc/mtab or similar.
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#
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# ADDENDUM: The addition of the --filter option (which has support for
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# absolute-anchored excludes) has made this script less useful than it
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# was. Beginning with 2.6.4, you can achieve the effect of this script
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# through this command:
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#
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# awk '{print $2}' /proc/mounts | rsync -f 'merge,/- -' host:/dir /dest/
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use strict;
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use warnings;
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use Cwd 'abs_path';
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my $file = '/proc/mounts';
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my $dir = shift || '/';
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$dir = abs_path($dir);
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$dir =~ s#([^/]*)$##;
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my $trailing = $1;
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$trailing = '' if $trailing eq '.' || !-d "$dir$trailing";
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$trailing .= '/' if $trailing ne '';
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open(IN, $file) or die "Unable to open $file: $!\n";
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while (<IN>) {
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$_ = (split)[1];
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next unless s#^\Q$dir$trailing\E##o && $_ ne '';
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print "- /$trailing$_\n";
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}
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close IN;
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