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Improve error formatting

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Changes:

* The divider lines are gone. These were in practice a bit confusing,
  in particular with --show-trace or --keep-going, since then there
  were multiple lines, suggesting a start/end which wasn't the case.

* Instead, multi-line error messages are now indented to align with
  the prefix (e.g. "error: ").

* The 'description' field is gone since we weren't really using it.

* 'hint' is renamed to 'msg' since it really wasn't a hint.

* The error is now printed *before* the location info.

* The 'name' field is no longer printed since most of the time it
  wasn't very useful since it was just the name of the exception (like
  EvalError). Ideally in the future this would be a unique, easily
  googleable error ID (like rustc).

* "trace:" is now just "…". This assumes error contexts start with
  something like "while doing X".

Example before:

  error: --- AssertionError ---------------------------------------------------------------------------------------- nix
  at: (7:7) in file: /home/eelco/Dev/nixpkgs/pkgs/applications/misc/hello/default.nix

       6|
       7|   x = assert false; 1;
        |       ^
       8|

  assertion 'false' failed
  ----------------------------------------------------- show-trace -----------------------------------------------------
  trace: while evaluating the attribute 'x' of the derivation 'hello-2.10'
  at: (192:11) in file: /home/eelco/Dev/nixpkgs/pkgs/stdenv/generic/make-derivation.nix

     191|         // (lib.optionalAttrs (!(attrs ? name) && attrs ? pname && attrs ? version)) {
     192|           name = "${attrs.pname}-${attrs.version}";
        |           ^
     193|         } // (lib.optionalAttrs (stdenv.hostPlatform != stdenv.buildPlatform && !dontAddHostSuffix && (attrs ? name || (attrs ? pname && attrs ? version)))) {

Example after:

  error: assertion 'false' failed

         at: (7:7) in file: /home/eelco/Dev/nixpkgs/pkgs/applications/misc/hello/default.nix

              6|
              7|   x = assert false; 1;
               |       ^
              8|

         … while evaluating the attribute 'x' of the derivation 'hello-2.10'

         at: (192:11) in file: /home/eelco/Dev/nixpkgs/pkgs/stdenv/generic/make-derivation.nix

            191|         // (lib.optionalAttrs (!(attrs ? name) && attrs ? pname && attrs ? version)) {
            192|           name = "${attrs.pname}-${attrs.version}";
               |           ^
            193|         } // (lib.optionalAttrs (stdenv.hostPlatform != stdenv.buildPlatform && !dontAddHostSuffix && (attrs ? name || (attrs ? pname && attrs ? version)))) {
This commit is contained in:
Eelco Dolstra 2021-01-21 00:27:36 +01:00
parent 259100332f
commit 8d4268d190
31 changed files with 249 additions and 422 deletions
Download patch file Download diff file Expand all files Collapse all files

20
src/nix-env/nix-env.cc
View file

@ -124,10 +124,7 @@ static void getAllExprs(EvalState & state,
if (hasSuffix(attrName, ".nix"))
attrName = string(attrName, 0, attrName.size() - 4);
if (!attrs.insert(attrName).second) {
logError({
.name = "Name collision",
.hint = hintfmt("warning: name collision in input Nix expressions, skipping '%1%'", path2)
});
printError("warning: name collision in input Nix expressions, skipping '%1%'", path2);
continue;
}
/* Load the expression on demand. */
@ -876,11 +873,7 @@ static void queryJSON(Globals & globals, vector<DrvInfo> & elems)
auto placeholder = metaObj.placeholder(j);
Value * v = i.queryMeta(j);
if (!v) {
logError({
.name = "Invalid meta attribute",
.hint = hintfmt("derivation '%s' has invalid meta attribute '%s'",
i.queryName(), j)
});
printError("derivation '%s' has invalid meta attribute '%s'", i.queryName(), j);
placeholder.write(nullptr);
} else {
PathSet context;
@ -1131,12 +1124,9 @@ static void opQuery(Globals & globals, Strings opFlags, Strings opArgs)
attrs2["name"] = j;
Value * v = i.queryMeta(j);
if (!v)
logError({
.name = "Invalid meta attribute",
.hint = hintfmt(
"derivation '%s' has invalid meta attribute '%s'",
i.queryName(), j)
});
printError(
"derivation '%s' has invalid meta attribute '%s'",
i.queryName(), j);
else {
if (v->type() == nString) {
attrs2["type"] = "string";