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FSAccessor: Make the fileSize and narOffset fields optional

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The narOffset field only applies to NAR accessors. The fileSize field
may be too expensive to compute for certain accessors (e.g. libgit).
This commit is contained in:
Eelco Dolstra 2023-11-01 15:39:40 +01:00
parent 5381123879
commit 50aae0a14c
3 changed files with 9 additions and 8 deletions
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4
src/libstore/fs-accessor.hh
View file

@ -23,7 +23,7 @@ public:
/**
* For regular files only: the size of the file.
*/
uint64_t fileSize = 0;
std::optional<uint64_t> fileSize;
/**
* For regular files only: whether this is an executable.
*/
@ -32,7 +32,7 @@ public:
* For regular files only: the position of the contents of this
* file in the NAR.
*/
uint64_t narOffset = 0;
std::optional<uint64_t> narOffset;
};
virtual ~FSAccessor() { }

11
src/libstore/nar-accessor.cc
View file

@ -210,10 +210,10 @@ struct NarAccessor : public FSAccessor
if (i.stat.type != Type::tRegular)
throw Error("path '%1%' inside NAR file is not a regular file", path);
if (getNarBytes) return getNarBytes(i.stat.narOffset, i.stat.fileSize);
if (getNarBytes) return getNarBytes(*i.stat.narOffset, *i.stat.fileSize);
assert(nar);
return std::string(*nar, i.stat.narOffset, i.stat.fileSize);
return std::string(*nar, *i.stat.narOffset, *i.stat.fileSize);
}
std::string readLink(const Path & path) override
@ -253,11 +253,12 @@ json listNar(ref<FSAccessor> accessor, const Path & path, bool recurse)
switch (st->type) {
case SourceAccessor::Type::tRegular:
obj["type"] = "regular";
obj["size"] = st->fileSize;
if (st->fileSize)
obj["size"] = *st->fileSize;
if (st->isExecutable)
obj["executable"] = true;
if (st->narOffset)
obj["narOffset"] = st->narOffset;
if (st->narOffset && *st->narOffset)
obj["narOffset"] = *st->narOffset;
break;
case SourceAccessor::Type::tDirectory:
obj["type"] = "directory";

2
src/nix/ls.cc
View file

@ -52,7 +52,7 @@ struct MixLs : virtual Args, MixJSON
(st->isExecutable ? "-r-xr-xr-x" : "-r--r--r--") :
st->type == FSAccessor::Type::tSymlink ? "lrwxrwxrwx" :
"dr-xr-xr-x";
auto line = fmt("%s %20d %s", tp, st->fileSize, relPath);
auto line = fmt("%s %20d %s", tp, st->fileSize.value_or(0), relPath);
if (st->type == FSAccessor::Type::tSymlink)
line += " -> " + accessor->readLink(curPath);
logger->cout(line);