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Remove TreeInfo

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The attributes previously stored in TreeInfo (narHash, revCount,
lastModified) are now stored in Input. This makes it less arbitrary
what attributes are stored where.

As a result, the lock file format has changed. An entry like

    "info": {
      "lastModified": 1585405475,
      "narHash": "sha256-bESW0n4KgPmZ0luxvwJ+UyATrC6iIltVCsGdLiphVeE="
    },
    "locked": {
      "owner": "NixOS",
      "repo": "nixpkgs",
      "rev": "b88ff468e9850410070d4e0ccd68c7011f15b2be",
      "type": "github"
    },

is now stored as

    "locked": {
      "owner": "NixOS",
      "repo": "nixpkgs",
      "rev": "b88ff468e9850410070d4e0ccd68c7011f15b2be",
      "type": "github",
      "lastModified": 1585405475,
      "narHash": "sha256-bESW0n4KgPmZ0luxvwJ+UyATrC6iIltVCsGdLiphVeE="
    },

The 'Input' class is now a dumb set of attributes. All the fetcher
implementations subclass InputScheme, not Input. This simplifies the
API.

Also, fix substitution of flake inputs. This was broken since lazy
flake fetching started using fetchTree internally.
This commit is contained in:
Eelco Dolstra 2020-05-30 00:44:11 +02:00
parent 5633c0975b
commit 950b46821f
30 changed files with 963 additions and 1145 deletions
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184
src/libfetchers/path.cc
View file

@ -3,76 +3,86 @@
namespace nix::fetchers {
struct PathInput : Input
struct PathInputScheme : InputScheme
{
Path path;
/* Allow the user to pass in "fake" tree info attributes. This is
useful for making a pinned tree work the same as the repository
from which is exported
(e.g. path:/nix/store/...-source?lastModified=1585388205&rev=b0c285...). */
std::optional<Hash> rev;
std::optional<uint64_t> revCount;
std::optional<time_t> lastModified;
std::string type() const override { return "path"; }
std::optional<Hash> getRev() const override { return rev; }
bool operator ==(const Input & other) const override
std::optional<Input> inputFromURL(const ParsedURL & url) override
{
auto other2 = dynamic_cast<const PathInput *>(&other);
return
other2
&& path == other2->path
&& rev == other2->rev
&& revCount == other2->revCount
&& lastModified == other2->lastModified;
if (url.scheme != "path") return {};
if (url.authority && *url.authority != "")
throw Error("path URL '%s' should not have an authority ('%s')", url.url, *url.authority);
Input input;
input.attrs.insert_or_assign("type", "path");
input.attrs.insert_or_assign("path", url.path);
for (auto & [name, value] : url.query)
if (name == "rev" || name == "narHash")
input.attrs.insert_or_assign(name, value);
else if (name == "revCount" || name == "lastModified") {
uint64_t n;
if (!string2Int(value, n))
throw Error("path URL '%s' has invalid parameter '%s'", url.to_string(), name);
input.attrs.insert_or_assign(name, n);
}
else
throw Error("path URL '%s' has unsupported parameter '%s'", url.to_string(), name);
return input;
}
bool isImmutable() const override
std::optional<Input> inputFromAttrs(const Attrs & attrs) override
{
return narHash || rev;
if (maybeGetStrAttr(attrs, "type") != "path") return {};
getStrAttr(attrs, "path");
for (auto & [name, value] : attrs)
/* Allow the user to pass in "fake" tree info
attributes. This is useful for making a pinned tree
work the same as the repository from which is exported
(e.g. path:/nix/store/...-source?lastModified=1585388205&rev=b0c285...). */
if (name == "type" || name == "rev" || name == "revCount" || name == "lastModified" || name == "narHash" || name == "path")
// checked in Input::fromAttrs
;
else
throw Error("unsupported path input attribute '%s'", name);
Input input;
input.attrs = attrs;
return input;
}
ParsedURL toURL() const override
ParsedURL toURL(const Input & input) override
{
auto query = attrsToQuery(toAttrsInternal());
auto query = attrsToQuery(input.attrs);
query.erase("path");
query.erase("type");
return ParsedURL {
.scheme = "path",
.path = path,
.path = getStrAttr(input.attrs, "path"),
.query = query,
};
}
Attrs toAttrsInternal() const override
bool hasAllInfo(const Input & input) override
{
Attrs attrs;
attrs.emplace("path", path);
if (rev)
attrs.emplace("rev", rev->gitRev());
if (revCount)
attrs.emplace("revCount", *revCount);
if (lastModified)
attrs.emplace("lastModified", *lastModified);
if (!rev && narHash)
attrs.emplace("narHash", narHash->to_string(SRI));
return attrs;
return true;
}
std::optional<Path> getSourcePath() const override
std::optional<Path> getSourcePath(const Input & input) override
{
return path;
return getStrAttr(input.attrs, "path");
}
void markChangedFile(std::string_view file, std::optional<std::string> commitMsg) const override
void markChangedFile(const Input & input, std::string_view file, std::optional<std::string> commitMsg) override
{
// nothing to do
}
std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(nix::ref<Store> store) const override
std::pair<Tree, Input> fetch(ref<Store> store, const Input & input) override
{
auto input = std::make_shared<PathInput>(*this);
auto path = getStrAttr(input.attrs, "path");
// FIXME: check whether access to 'path' is allowed.
@ -85,83 +95,13 @@ struct PathInput : Input
// FIXME: try to substitute storePath.
storePath = store->addToStore("source", path);
input->narHash = store->queryPathInfo(*storePath)->narHash;
return
{
Tree {
.actualPath = store->toRealPath(*storePath),
.storePath = std::move(*storePath),
.info = TreeInfo {
.revCount = revCount,
.lastModified = lastModified
}
},
input
};
}
};
struct PathInputScheme : InputScheme
{
std::unique_ptr<Input> inputFromURL(const ParsedURL & url) override
{
if (url.scheme != "path") return nullptr;
auto input = std::make_unique<PathInput>();
input->path = url.path;
if (url.authority && *url.authority != "")
throw Error("path URL '%s' should not have an authority ('%s')", url.url, *url.authority);
for (auto & [name, value] : url.query)
if (name == "rev")
input->rev = Hash(value, htSHA1);
else if (name == "revCount") {
uint64_t revCount;
if (!string2Int(value, revCount))
throw Error("path URL '%s' has invalid parameter '%s'", url.to_string(), name);
input->revCount = revCount;
}
else if (name == "lastModified") {
time_t lastModified;
if (!string2Int(value, lastModified))
throw Error("path URL '%s' has invalid parameter '%s'", url.to_string(), name);
input->lastModified = lastModified;
}
else if (name == "narHash")
// FIXME: require SRI hash.
input->narHash = Hash(value);
else
throw Error("path URL '%s' has unsupported parameter '%s'", url.to_string(), name);
return input;
}
std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs) override
{
if (maybeGetStrAttr(attrs, "type") != "path") return {};
auto input = std::make_unique<PathInput>();
input->path = getStrAttr(attrs, "path");
for (auto & [name, value] : attrs)
if (name == "rev")
input->rev = Hash(getStrAttr(attrs, "rev"), htSHA1);
else if (name == "revCount")
input->revCount = getIntAttr(attrs, "revCount");
else if (name == "lastModified")
input->lastModified = getIntAttr(attrs, "lastModified");
else if (name == "narHash")
// FIXME: require SRI hash.
input->narHash = Hash(getStrAttr(attrs, "narHash"));
else if (name == "type" || name == "path")
;
else
throw Error("unsupported path input attribute '%s'", name);
return input;
return {
Tree {
.actualPath = store->toRealPath(*storePath),
.storePath = std::move(*storePath),
},
input
};
}
};