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60 lines
2.4 KiB
Python
Executable File
60 lines
2.4 KiB
Python
Executable File
#!/usr/bin/env python3
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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) can make this script unneeded in some
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# scenarios. If you don't need delete protection on the receiving side
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# (or if the destination path is identical to the source path), then you
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# can exclude some absolute paths from the transfer based on the mount
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# dirs. For instance:
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#
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# awk '{print $2}' /proc/mounts | grep -v '^/$' | \
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# rsync -avf 'merge,/- -' /dir host:/dest/
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import os, argparse
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MNT_FILE = '/proc/mounts';
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def main():
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trailing_slash = '/' if args.path.endswith(('/', '/.')) and args.path != '/' else ''
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args.path = os.path.realpath(args.path) + trailing_slash
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parent_dir = os.path.dirname(args.path)
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trailing = os.path.basename(args.path)
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if not os.path.isdir(args.path):
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trailing = ''
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elif trailing != '':
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trailing += '/'
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want_path = os.path.join(parent_dir, trailing)
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wp_len = len(want_path)
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with open(MNT_FILE) as fh:
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for line in fh:
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mnt_path = line.split()[1]
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if mnt_path.startswith(want_path) and mnt_path != want_path:
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print(f"- /{trailing}{mnt_path[wp_len:]}")
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if __name__ == '__main__':
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parser = argparse.ArgumentParser(description="Output mount points as rsync excludes.", add_help=False)
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parser.add_argument("--help", "-h", action="help", help="Output this help message and exit.")
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parser.add_argument('path', metavar='PATH', nargs='?', default='/', help="Limit output to those within the PATH hierarchy.")
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args = parser.parse_args()
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main()
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# vim: sw=4 et
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