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Fix underflow in Printer::printAttrs

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The code that counts the number of elided attrs incorrectly used the
per-printer "global" attribute counter instead of a counter that
was relevant only to the current attribute set.

This bug flew under the radar because often the attribute sets aren't
nested, not big enough, or we wouldn't pay attention to the numbers.
I've noticed the issue because the difference underflowed.

Although this behavior is tested by the functional test
lang/eval-fail-bad-string-interpolation-4.nix, the underflow slipped
through review. A simpler reproducer would be as follows, but I
haven't added it to the test suite to keep it simple and marginally
faster.

```
$ nix run nix/2.23.1 -- eval --expr '"" + (let v = { a = { a = 1; b = 2; c = 1; d = 1; e = 1; f = 1; g = 1; h = 1; }; b = { a = 1; b = 1; c = 1; }; }; in builtins.deepSeq v v)'
error:
       … while evaluating a path segment
         at «string»:1:6:
            1| "" + (let v = { a = { a = 1; b = 2; c = 1; d = 1; e = 1; f = 1; g = 1; h = 1; }; b = { a = 1; b = 1; c = 1; }; }; in builtins.deepSeq v v)
             |      ^

       error: cannot coerce a set to a string: { a = { a = 1; b = 2; c = 1; d = 1; e = 1; f = 1; g = 1; h = 1; }; b = { a = 1; «4294967289 attributes elided» }; }
```
This commit is contained in:
Robert Hensing 2024-06-29 13:48:17 +02:00
parent 32e6cc64b5
commit 9b88bf8adf
2 changed files with 5 additions and 2 deletions
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5
src/libexpr/print.cc
View file

@ -345,11 +345,13 @@ private:
auto prettyPrint = shouldPrettyPrintAttrs(sorted); auto prettyPrint = shouldPrettyPrintAttrs(sorted);
size_t currentAttrsPrinted = 0;
for (auto & i : sorted) { for (auto & i : sorted) {
printSpace(prettyPrint); printSpace(prettyPrint);
if (attrsPrinted >= options.maxAttrs) { if (attrsPrinted >= options.maxAttrs) {
printElided(sorted.size() - attrsPrinted, "attribute", "attributes"); printElided(sorted.size() - currentAttrsPrinted, "attribute", "attributes");
break; break;
} }
@ -358,6 +360,7 @@ private:
print(*i.second, depth + 1); print(*i.second, depth + 1);
output << ";"; output << ";";
attrsPrinted++; attrsPrinted++;
currentAttrsPrinted++;
} }
decreaseIndent(); decreaseIndent();

2
tests/functional/lang/eval-fail-bad-string-interpolation-4.err.exp
View file

@ -6,4 +6,4 @@ error:
| ^ | ^
10| 10|
error: cannot coerce a set to a string: { a = { a = { a = { a = "ha"; b = "ha"; c = "ha"; d = "ha"; e = "ha"; f = "ha"; g = "ha"; h = "ha"; j = "ha"; }; «4294967295 attributes elided» }; «4294967294 attributes elided» }; «4294967293 attributes elided» } error: cannot coerce a set to a string: { a = { a = { a = { a = "ha"; b = "ha"; c = "ha"; d = "ha"; e = "ha"; f = "ha"; g = "ha"; h = "ha"; j = "ha"; }; «8 attributes elided» }; «8 attributes elided» }; «8 attributes elided» }