Answer 1

Within the directory, there should be a directory called '.svn'. Within this, a file named 'locked' indicates that the directory is locked.

Answered by: Chloe596 | Posted: 01-03-2022

Answer 2

This sounds like a potential race condition, in that something like the following can happen:

1. Process A checks to see if the directory exists (it doesn't yet).
2. Process B checks to see if the directory exists (it doesn't yet).
3. Process A invokes svn, which creates the directory.
4. Process B invokes svn, which subsequently fails.

An easy way to avoid this is to have each process attempt to create the directory rather than checking for its existence. If the other process has already created the directory, the other process is guaranteed to get a well-defined error code under a very wide variety of platforms and filesystems. For instance, this is one of the only reliable ways to do synchronization on many implementations of NFS. Luckily, svn won't care if the working directory already exists.

The Python code would look something like this:

import os, errno

# ...

try:
  os.mkdir(dirName)
except OSError, e:
  if e.errno != errno.EEXIST: raise # some other error
  print 'Directory already exists.'
else:
  print 'Successfully created new directory.'

This technique is easy to implement, very reliable, and useful in a wide variety of situations.

Answered by: Arthur930 | Posted: 01-03-2022

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