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diff-closures: remove gratuitous copy

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This was done originally because std::smatch does not accept `const char
*` as iterators. However, this was because we should have been using
std::cmatch instead.

(cherry picked from commit 12a5838d11)
This commit is contained in:
Jade Lovelace 2024-07-23 21:45:30 +02:00 committed by Jörg Thalheim
parent 492715c0bb
commit 07aeedd37e
1 changed files with 4 additions and 11 deletions
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15
src/nix/diff-closures.cc
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@ -25,24 +25,17 @@ GroupedPaths getClosureInfo(ref<Store> store, const StorePath & toplevel)
GroupedPaths groupedPaths;
for (auto & path : closure) {
for (auto const & path : closure) {
/* Strip the output name. Unfortunately this is ambiguous (we
can't distinguish between output names like "bin" and
version suffixes like "unstable"). */
static std::regex regex("(.*)-([a-z]+|lib32|lib64)");
std::smatch match;
std::cmatch match;
std::string name{path.name()};
// Used to keep name alive through being potentially overwritten below
// (to not invalidate the references from the regex result)
//
// n.b. cannot be just path.name().{begin,end}() since that returns const
// char *, which does not, for some reason, convert as required on
// libstdc++. Seems like a libstdc++ bug or standard bug to me... we
// can afford the allocation in any case.
const std::string origName{path.name()};
std::string_view const origName = path.name();
std::string outputName;
if (std::regex_match(origName, match, regex)) {
if (std::regex_match(origName.begin(), origName.end(), match, regex)) {
name = match[1];
outputName = match[2];
}