diff options
author | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2013-10-28 19:48:30 +0100 |
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committer | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2013-10-28 22:45:57 +0100 |
commit | 73f32d03758a53ad1baac31795cfd99e325032f3 (patch) | |
tree | 8df21c7319e758a85a4916890714b0d90c631a67 /nixos/modules/config/shells-environment.nix | |
parent | dbefab9cf42c09444dd2554380104096969c0728 (diff) |
Show precise error messages in option merge failures
For instance, if time.timeZone is defined multiple times, you now get
the error message:
error: user-thrown exception: The unique option `time.timeZone' is defined multiple times, in `/etc/nixos/configurations/misc/eelco/x11vnc.nix' and `/etc/nixos/configuration.nix'.
while previously you got:
error: user-thrown exception: Multiple definitions of string. Only one is allowed for this option.
and only an inspection of the stack trace gave a clue as to what
option caused the problem.
Diffstat (limited to 'nixos/modules/config/shells-environment.nix')
-rw-r--r-- | nixos/modules/config/shells-environment.nix | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/nixos/modules/config/shells-environment.nix b/nixos/modules/config/shells-environment.nix index 4c40f33532f8..36f8549af8e2 100644 --- a/nixos/modules/config/shells-environment.nix +++ b/nixos/modules/config/shells-environment.nix @@ -25,11 +25,14 @@ in ''; type = types.attrsOf (mkOptionType { name = "a string or a list of strings"; - merge = xs: + merge = args: xs: let xs' = filterOverrides xs; in if isList (head xs') then concatLists xs' - else if builtins.lessThan 1 (length xs') then abort "variable in ‘environment.variables’ has multiple values" - else if !builtins.isString (head xs') then abort "variable in ‘environment.variables’ does not have a string value" + else if builtins.lessThan 1 (length xs') then + # Don't show location info here, since it's too general. + throw "The option `${showOption args.prefix}' is defined multiple times." + else if !builtins.isString (head xs') then + throw "The option `${showOption args.prefix}' does not have a string value." else head xs'; }); apply = mapAttrs (n: v: if isList v then concatStringsSep ":" v else v); |