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Annotation of embedaddon/rsync/support/mnt-excl, revision 1.1.1.1

1.1       misho       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 script 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;