INNER CODE UNIT · Python

PrexistingUnixCommand

broadinstitute/viral-ngs · src/viral_ngs/core/__init__.py:146

class PrexistingUnixCommand(InstallMethod):
    ''' This is an install method that tries to find whether an executable
        binary already exists for free on the unix file system--it doesn't
        actually try to install anything.
    '''

    def __init__(self, path, verifycmd=None, verifycode=0, require_executability=True):
        self.path = path
        self.verifycmd = verifycmd
        self.verifycode = verifycode
        self.installed = False
        self.require_executability = require_executability
        InstallMethod.__init__(self)

    def _attempt_install(self):
        if os.access(self.path, (os.X_OK | os.R_OK) if self.require_executability else os.R_OK):
            if self.verifycmd:
                self.installed = (os.system(self.verifycmd) == self.verifycode)

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