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Factor out abstract syntax for Store URIs

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Need to decouple parsing from actually opening a store for Machine
configs.

Co-authored-by: Théophane Hufschmitt <7226587+thufschmitt@users.noreply.github.com>
Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
This commit is contained in:
John Ericson 2024-01-23 14:23:03 -05:00
parent 1d6c2316a9
commit c036d75f9e
4 changed files with 236 additions and 132 deletions
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147
src/libstore/store-api.cc
View file

@ -8,7 +8,6 @@
#include "util.hh"
#include "nar-info-disk-cache.hh"
#include "thread-pool.hh"
#include "url.hh"
#include "references.hh"
#include "archive.hh"
#include "callback.hh"
@ -1267,109 +1266,63 @@ Derivation Store::readInvalidDerivation(const StorePath & drvPath)
namespace nix {
/* Split URI into protocol+hierarchy part and its parameter set. */
std::pair<std::string, Store::Params> splitUriAndParams(const std::string & uri_)
{
auto uri(uri_);
Store::Params params;
auto q = uri.find('?');
if (q != std::string::npos) {
params = decodeQuery(uri.substr(q + 1));
uri = uri_.substr(0, q);
}
return {uri, params};
}
static bool isNonUriPath(const std::string & spec)
{
return
// is not a URL
spec.find("://") == std::string::npos
// Has at least one path separator, and so isn't a single word that
// might be special like "auto"
&& spec.find("/") != std::string::npos;
}
std::shared_ptr<Store> openFromNonUri(const std::string & uri, const Store::Params & params)
{
// TODO reenable on Windows once we have `LocalStore` and
// `UDSRemoteStore`.
if (uri == "" || uri == "auto") {
auto stateDir = getOr(params, "state", settings.nixStateDir);
if (access(stateDir.c_str(), R_OK | W_OK) == 0)
return std::make_shared<LocalStore>(params);
else if (pathExists(settings.nixDaemonSocketFile))
return std::make_shared<UDSRemoteStore>(params);
#if __linux__
else if (!pathExists(stateDir)
&& params.empty()
&& !isRootUser()
&& !getEnv("NIX_STORE_DIR").has_value()
&& !getEnv("NIX_STATE_DIR").has_value())
{
/* If /nix doesn't exist, there is no daemon socket, and
we're not root, then automatically set up a chroot
store in ~/.local/share/nix/root. */
auto chrootStore = getDataDir() + "/nix/root";
if (!pathExists(chrootStore)) {
try {
createDirs(chrootStore);
} catch (Error & e) {
return std::make_shared<LocalStore>(params);
}
warn("'%s' does not exist, so Nix will use '%s' as a chroot store", stateDir, chrootStore);
} else
debug("'%s' does not exist, so Nix will use '%s' as a chroot store", stateDir, chrootStore);
return std::make_shared<LocalStore>("local", chrootStore, params);
}
#endif
else
return std::make_shared<LocalStore>(params);
} else if (uri == "daemon") {
return std::make_shared<UDSRemoteStore>(params);
} else if (uri == "local") {
return std::make_shared<LocalStore>(params);
} else if (isNonUriPath(uri)) {
return std::make_shared<LocalStore>("local", absPath(uri), params);
} else {
return nullptr;
}
}
ref<Store> openStore(const std::string & uri_,
ref<Store> openStore(const std::string & uri,
const Store::Params & extraParams)
{
auto params = extraParams;
try {
auto parsedUri = parseURL(uri_);
params.insert(parsedUri.query.begin(), parsedUri.query.end());
return openStore(StoreReference::parse(uri, extraParams));
}
auto baseURI = parsedUri.authority.value_or("") + parsedUri.path;
ref<Store> openStore(StoreReference && storeURI)
{
auto & params = storeURI.params;
for (auto implem : *Implementations::registered) {
if (implem.uriSchemes.count(parsedUri.scheme)) {
auto store = implem.create(parsedUri.scheme, baseURI, params);
if (store) {
experimentalFeatureSettings.require(store->experimentalFeature());
store->init();
store->warnUnknownSettings();
return ref<Store>(store);
}
auto store = std::visit(overloaded {
[&](const StoreReference::Auto &) -> std::shared_ptr<Store> {
auto stateDir = getOr(params, "state", settings.nixStateDir);
if (access(stateDir.c_str(), R_OK | W_OK) == 0)
return std::make_shared<LocalStore>(params);
else if (pathExists(settings.nixDaemonSocketFile))
return std::make_shared<UDSRemoteStore>(params);
#if __linux__
else if (!pathExists(stateDir)
&& params.empty()
&& !isRootUser()
&& !getEnv("NIX_STORE_DIR").has_value()
&& !getEnv("NIX_STATE_DIR").has_value())
{
/* If /nix doesn't exist, there is no daemon socket, and
we're not root, then automatically set up a chroot
store in ~/.local/share/nix/root. */
auto chrootStore = getDataDir() + "/nix/root";
if (!pathExists(chrootStore)) {
try {
createDirs(chrootStore);
} catch (Error & e) {
return std::make_shared<LocalStore>(params);
}
warn("'%s' does not exist, so Nix will use '%s' as a chroot store", stateDir, chrootStore);
} else
debug("'%s' does not exist, so Nix will use '%s' as a chroot store", stateDir, chrootStore);
return std::make_shared<LocalStore>("local", chrootStore, params);
}
}
}
catch (BadURL &) {
auto [uri, uriParams] = splitUriAndParams(uri_);
params.insert(uriParams.begin(), uriParams.end());
#endif
else
return std::make_shared<LocalStore>(params);
},
[&](const StoreReference::Specified & g) {
for (auto implem : *Implementations::registered)
if (implem.uriSchemes.count(g.scheme))
return implem.create(g.scheme, g.authority, params);
if (auto store = openFromNonUri(uri, params)) {
experimentalFeatureSettings.require(store->experimentalFeature());
store->warnUnknownSettings();
return ref<Store>(store);
}
}
throw Error("don't know how to open Nix store with scheme '%s'", g.scheme);
},
}, storeURI.variant);
throw Error("don't know how to open Nix store '%s'", uri_);
experimentalFeatureSettings.require(store->experimentalFeature());
store->warnUnknownSettings();
store->init();
return ref<Store> { store };
}
std::list<ref<Store>> getDefaultSubstituters()