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coerceToPath(): Handle __toString, add tests

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This commit is contained in:
Eelco Dolstra 2023-10-20 13:04:39 +02:00
parent bacceaea91
commit 173abec0bc
3 changed files with 21 additions and 16 deletions
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27
src/libexpr/eval.cc
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@ -2335,29 +2335,32 @@ SourcePath EvalState::coerceToPath(const PosIdx pos, Value & v, NixStringContext
{
try {
forceValue(v, pos);
if (v.type() == nString) {
copyContext(v, context);
auto s = v.string_view();
if (!hasPrefix(s, "/"))
error("string '%s' doesn't represent an absolute path", s).atPos(pos).debugThrow<EvalError>();
return rootPath(CanonPath(s));
}
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
}
/* Handle path values directly, without coercing to a string. */
if (v.type() == nPath)
return v.path();
/* Similarly, handle __toString where the result may be a path
value. */
if (v.type() == nAttrs) {
auto i = v.attrs->find(sOutPath);
if (i != v.attrs->end())
return coerceToPath(pos, *i->value, context, errorCtx);
auto i = v.attrs->find(sToString);
if (i != v.attrs->end()) {
Value v1;
callFunction(*i->value, v, v1, pos);
return coerceToPath(pos, v1, context, errorCtx);
}
}
error("cannot coerce %1% to a path", showType(v)).withTrace(pos, errorCtx).debugThrow<TypeError>();
/* Any other value should be coercable to a string, interpreted
relative to the root filesystem. */
auto path = coerceToString(pos, v, context, errorCtx, false, false, true).toOwned();
if (path == "" || path[0] != '/')
error("string '%1%' doesn't represent an absolute path", path).withTrace(pos, errorCtx).debugThrow<EvalError>();
return rootPath(CanonPath(path));
}