CODEWITHSUNDEEP
pythonsvnsubprocess
Lossril
Lossril

Reputation: 13

Python incorrect call() behaviour while calling svn di

I call 

'svn di -revision <revNumber>:HEAD --summarize --xml >>svndiff.xml'

through subprocess.call(), and I get an error 

svn: E020024: Error resolving case of '>>svndiff.xml'

If I type the same command into terminal, it works fine. Where is a trap?

Upvotes: 1

Views: 87

Answers (1)

user4815162342
user4815162342

Reputation: 155465

In the terminal, >>svndiff.xml gets interpreted by the shell. When using subprocess.call in the default mode, such an argument gets passed to the svn process literally. (You didn't show the actual subprocess.call invocation, but given the error message, that's the most likely diagnosis.)

Instead, you must use the stderr keyword argument to provide suitable output. For example:

with open('svndiff.xml', 'a') as log:
    subprocess.call(["svn", "di", "--revision", "%s:head" % rev_number,
                     "--summarize", "--xml"], stdout=log)

or, you can use shell=True to have the shell do it for you (with the usual pitfalls of shell parsing such as problems with file names containing spaces and shell injection):

subprocess.call("svn di --revision %s:HEAD --summarize --xml >>svndiff.xml" % rev_number,
                shell=True)

Upvotes: 1

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