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Retrives list of all NodeJS applications for all users, which uses supplied version of NodeJS
:param from_version: Required NodeJS version
:return: Cortege: (application_list, application_count). Example:
({'cltest1': [u'modjsapp_root'], 'cltest2': [u'app2', u'main_app']}, 3)
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Determine is background process already working
:return: True|False
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Checks if NodeJS version blocked by background operation
:param nj_version: NodeJS version to check
:return: True - version is locked, False - not locked
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Creates pid file for background process move version from version to version
:param from_version: Move from NJ version
:param to_version: Move to NJ version
:param total_apps_count: Total application count to move
:return: None
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Reads pid file and returns it's content as dictionary
:return: Dictionary
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Creates pid file for background process move version from version to version
:param remaining_apps_count: Remaining application count to move
:return: None
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Retrieves application counts from pid file
:return: Cortege (remaining_apps_count, total_apps_count)
If no background process started, returns None, None
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Validates passenger log file name
:param username: User's name
:param log_filename: passenger log file name to validate
:return: tuple: (message, log_filename).
message: "OK" - filename is valid, any other string - invalid, error text
log_filename: corrected log filename - simlink dereferencing, appends user's homedir for relative paths, etc
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