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1
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# Program options processing
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2
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3
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import os
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4
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5
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def env_flag(name): return name in os.environ and os.environ[name] != ''
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6
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7
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def get_env_vars(names, prefix=None, env_names_ref=None):
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8
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# Requires that all env vars are set; otherwise returns None
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9
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has_all = True
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10
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vars_ = {}
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11
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for name in names:
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12
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env_name = name
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13
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if prefix != None: env_name = prefix+'_'+env_name
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14
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if env_names_ref != None: env_names_ref.append(env_name)
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15
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if env_name in os.environ: vars_[name] = os.environ[env_name]
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16
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else: has_all = False
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17
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if has_all: return vars_
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18
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else: return None
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