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Rename UnionInputAccessor to MountedInputAccessor

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This commit is contained in:
Eelco Dolstra 2023-11-14 14:01:38 +01:00
parent 21140c987b
commit 7f576f5dfe
4 changed files with 19 additions and 19 deletions
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79
src/libfetchers/union-input-accessor.cc
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@ -1,79 +0,0 @@
#include "union-input-accessor.hh"
namespace nix {
struct UnionInputAccessor : InputAccessor
{
std::map<CanonPath, ref<InputAccessor>> mounts;
UnionInputAccessor(std::map<CanonPath, ref<InputAccessor>> _mounts)
: mounts(std::move(_mounts))
{
// Currently we require a root filesystem. This could be relaxed.
assert(mounts.contains(CanonPath::root));
// FIXME: return dummy parent directories automatically?
}
std::string readFile(const CanonPath & path) override
{
auto [accessor, subpath] = resolve(path);
return accessor->readFile(subpath);
}
bool pathExists(const CanonPath & path) override
{
auto [accessor, subpath] = resolve(path);
return accessor->pathExists(subpath);
}
std::optional<Stat> maybeLstat(const CanonPath & path) override
{
auto [accessor, subpath] = resolve(path);
return accessor->maybeLstat(subpath);
}
DirEntries readDirectory(const CanonPath & path) override
{
auto [accessor, subpath] = resolve(path);
return accessor->readDirectory(subpath);
}
std::string readLink(const CanonPath & path) override
{
auto [accessor, subpath] = resolve(path);
return accessor->readLink(subpath);
}
std::string showPath(const CanonPath & path) override
{
auto [accessor, subpath] = resolve(path);
return accessor->showPath(subpath);
}
std::pair<ref<InputAccessor>, CanonPath> resolve(CanonPath path)
{
// Find the nearest parent of `path` that is a mount point.
std::vector<std::string> ss;
while (true) {
auto i = mounts.find(path);
if (i != mounts.end()) {
auto subpath = CanonPath::root;
for (auto j = ss.rbegin(); j != ss.rend(); ++j)
subpath.push(*j);
return {i->second, std::move(subpath)};
}
assert(!path.isRoot());
ss.push_back(std::string(*path.baseName()));
path.pop();
}
}
};
ref<InputAccessor> makeUnionInputAccessor(std::map<CanonPath, ref<InputAccessor>> mounts)
{
return make_ref<UnionInputAccessor>(std::move(mounts));
}
}