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shared.c: Only setenv() if value is non-null
Some setenv() implementations (e.g. the one in OpenBSD's stdlib) segfault if we pass a NULL value. Only set environment variables if the corresponding settings are defined to avoid this. Note that this is a minor behaviour change as environment variables were supposed to be set to an empty string if a setting was undefined. Given that this feature isn't part of any official release yet, there's no need to worry about backwards compatibility, really. Change the documentation accordingly. Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de>
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@ -500,7 +500,7 @@ Also, all filters are handed the following environment variables:
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If a setting is not defined for a repository and the corresponding global
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setting is also not defined (if applicable), then the corresponding
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environment variable will be an empty string.
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environment variable will be unset.
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MACRO EXPANSION
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