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Factor out MemorySourceAccessor, implement missing features

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The new `MemorySourceAccessor` rather than being a slightly lossy flat
map is a complete in-memory model of file system objects.

Co-authored-by: Eelco Dolstra <edolstra@gmail.com>
This commit is contained in:
John Ericson 2023-11-02 19:39:09 -04:00
parent 8e222fbb12
commit 9b880e3e29
4 changed files with 205 additions and 39 deletions
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44
src/libfetchers/memory-input-accessor.cc
View file

@ -1,48 +1,16 @@
#include "memory-input-accessor.hh"
#include "memory-source-accessor.hh"
namespace nix {
struct MemoryInputAccessorImpl : MemoryInputAccessor
struct MemoryInputAccessorImpl : MemoryInputAccessor, MemorySourceAccessor
{
std::map<CanonPath, std::string> files;
std::string readFile(const CanonPath & path) override
{
auto i = files.find(path);
if (i == files.end())
throw Error("file '%s' does not exist", path);
return i->second;
}
bool pathExists(const CanonPath & path) override
{
auto i = files.find(path);
return i != files.end();
}
std::optional<Stat> maybeLstat(const CanonPath & path) override
{
auto i = files.find(path);
if (i != files.end())
return Stat { .type = tRegular, .isExecutable = false };
return std::nullopt;
}
DirEntries readDirectory(const CanonPath & path) override
{
return {};
}
std::string readLink(const CanonPath & path) override
{
throw UnimplementedError("MemoryInputAccessor::readLink");
}
SourcePath addFile(CanonPath path, std::string && contents) override
{
files.emplace(path, std::move(contents));
return {ref(shared_from_this()), std::move(path)};
return {
ref(shared_from_this()),
MemorySourceAccessor::addFile(path, std::move(contents))
};
}
};