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:
9 # mnt-excl /dir | rsync --exclude-from=- ... /dir /dest/
10 # mnt-excl /dir/ | rsync --exclude-from=- ... /dir/ /dest/
11 # ssh host mnt-excl /dir | rsync --exclude-from=- ... host:/dir /dest/
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).
17 # NOTE: This script expects /proc/mounts to exist, but could be
18 # easily adapted to read /etc/mtab or similar.
20 # ADDENDUM: The addition of the --filter option (which has support for
21 # absolute-anchored excludes) has made this script less useful than it
22 # was. Beginning with 2.6.4, you can achieve the effect of this script
23 # through this command:
25 # awk '{print $2}' /proc/mounts | rsync -f 'merge,/- -' host:/dir /dest/
30 my $file = '/proc/mounts';
31 my $dir = shift || '/';
32 $dir = abs_path($dir);
35 $trailing = '' if $trailing eq '.' || !-d "$dir$trailing";
36 $trailing .= '/' if $trailing ne '';
38 open(IN, $file) or die "Unable to open $file: $!\n";
41 next unless s#^\Q$dir$trailing\E##o && $_ ne '';
42 print "- /$trailing$_\n";