| 1 | #!/usr/bin/perl |
| 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/ |
| 11 | # ssh host mnt-excl /dir | rsync --exclude-from=- ... host:/dir /dest/ |
| 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. |
| 19 | # |
| 20 | # ADDENDUM: The addition of the --filter option (which has support for |
| 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: |
| 26 | # |
| 27 | # awk '{print $2}' /proc/mounts | grep -v '^/$' | \ |
| 28 | # rsync -avf 'merge,/- -' /dir host:/dest/ |
| 29 | |
| 30 | use strict; |
| 31 | use warnings; |
| 32 | use Cwd 'abs_path'; |
| 33 | |
| 34 | my $file = '/proc/mounts'; |
| 35 | my $dir = shift || '/'; |
| 36 | my $trailing_slash = $dir =~ m{./$} ? '/' : ''; |
| 37 | $dir = abs_path($dir) . $trailing_slash; |
| 38 | $dir =~ s{([^/]*)$}{}; |
| 39 | my $trailing = $1; |
| 40 | $trailing = '' if $trailing eq '.' || !-d "$dir$trailing"; |
| 41 | $trailing .= '/' if $trailing ne ''; |
| 42 | |
| 43 | open(IN, $file) or die "Unable to open $file: $!\n"; |
| 44 | while (<IN>) { |
| 45 | $_ = (split)[1]; |
| 46 | next unless s{^\Q$dir$trailing\E}{}o && $_ ne ''; |
| 47 | print "- /$trailing$_\n"; |
| 48 | } |
| 49 | close IN; |