revision_checking.py

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# Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
 
import os
import subprocess
 
def check_svn_revision(path):
    """
    Infer used SVN code revision.
 
    @param path location of the code whose SVN revision will be checked.
 
    If the target path is not an SVN repository, a manually maintained text file database of revisions will be
    consulted as a fallback.
 
    If neither the SVN check nor the fallback solution finds a revision, 'unknown' will be returned.
 
    @author Stefan Richter  <stefan.richter@cern.ch>
    """
    try:
        # Try getting the revision hash from the SVN repository
        command = "svn info {path}".format(path=os.path.realpath(path)) # expand symbolic links
        p = subprocess.Popen(command.split(), stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
        (svninfo, _) = p.communicate()
        for line in svninfo.split('\n'):
            if "Revision:" in line:
                return line.split()[-1]
    except Exception:
        # If it fails for whatever reason, ignore it
        pass
    try:
        # As a fallback solution, try to read the revision from a text database
        with open(os.path.join(os.environ["POWHEGPATH"], "ProcessRevisions.txt"), "r") as dbfile:
            for line in dbfile:
                tokens = line.split(" : ")
                if tokens[0] == os.path.basename(path): # found the process of interest
                    return tokens[1][1:] # return the revision number without the leading 'r'
    except Exception:
        # If it fails for whatever reason, ignore it
        pass
    # Neither method of getting the revision hash worked, so it is marked as "unknown"
    return "unknown"