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AttrCursor::getStringWithContext(): Force re-evaluation if the cached context is not valid

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Fixes #4236.
This commit is contained in:
Eelco Dolstra 2020-11-19 20:59:36 +01:00
parent 0327580e54
commit 4dcb183af3
1 changed files with 11 additions and 2 deletions
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9
src/libexpr/eval-cache.cc
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@ -525,8 +525,17 @@ string_t AttrCursor::getStringWithContext()
cachedValue = root->db->getAttr(getKey(), root->state.symbols);
if (cachedValue && !std::get_if<placeholder_t>(&cachedValue->second)) {
if (auto s = std::get_if<string_t>(&cachedValue->second)) {
bool valid = true;
for (auto & c : s->second) {
if (!root->state.store->isValidPath(root->state.store->parseStorePath(c.first))) {
valid = false;
break;
}
}
if (valid) {
debug("using cached string attribute '%s'", getAttrPathStr());
return *s;
}
} else
throw TypeError("'%s' is not a string", getAttrPathStr());
}