Improve error message for conflicting priorities #1571
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I find the error message 'nix-env --set-flag priority NUMBER PKGNAME' not as helpful as it could be : - doesn't share the current priorities - doesn't say that the command must be run on the already installed PKGNAME (which is confusing the first time) - the doc needs careful reading: "If there are multiple derivations matching a name in args that have the same name (e.g., gcc-3.3.6 and gcc-4.1.1), then the derivation with the highest priority is used." if one stops reading there, he is screwed. Salvation comes with reading "A derivation can define a priority by declaring the meta.priority attribute. This attribute should be a number, with a higher value denoting a lower priority. The default priority is 0." To sum it up, lower number wins. I tried to convey this idea in the message too.
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Thank you! |
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Thanks for the merge. The previous message did confuse me at the beginning (I know it's true for others too) and I hope this one might help beginners. |
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I find the error message 'nix-env --set-flag priority NUMBER PKGNAME'
not as helpful as it could be :
PKGNAME (which is confusing the first time)
"If there are multiple derivations matching a name in args that have the same name (e.g., gcc-3.3.6 and gcc-4.1.1), then the derivation with the highest priority is used."
if one stops reading there, he is screwed. Salvation comes with reading "A derivation can define a priority by declaring the meta.priority attribute. This attribute should be a number, with a higher value denoting a lower priority. The default priority is 0."
To sum it up, lower number wins. I tried to convey this idea in the
message too.
I haven't used this in production because nixUnstable tends to break my install and I wanted to check for agreement first.