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Escape ${ in strings when printing Nix expressions

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Otherwise the result of the printing can't be parsed back correctly by
Nix (because the unescaped `${` will be parsed as the begining of an
anti-quotation).

Fix #3989
This commit is contained in:
regnat 2020-09-14 17:19:25 +02:00
parent a59e77d9e5
commit 250f8a4bba
3 changed files with 3 additions and 2 deletions
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1
src/libexpr/eval.cc
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@ -87,6 +87,7 @@ static void printValue(std::ostream & str, std::set<const Value *> & active, con
else if (*i == '\n') str << "\\n";
else if (*i == '\r') str << "\\r";
else if (*i == '\t') str << "\\t";
else if (*i == '$' && *(i+1) == '{') str << "\\" << *i;
else str << *i;
str << "\"";
break;