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* Refactoring. There is now an abstract interface class StoreAPI

Browse source 
containing functions that operate on the Nix store.  One
  implementation is LocalStore, which operates on the Nix store
  directly.  The next step, to enable secure multi-user Nix, is to
  create a different implementation RemoteStore that talks to a
  privileged daemon process that uses LocalStore to perform the actual
  operations.
This commit is contained in:
Eelco Dolstra 2006-11-30 17:43:04 +00:00
parent 5f0b9de6d8
commit e2ef5e07fd
17 changed files with 458 additions and 338 deletions
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4
src/libexpr/eval.cc
View file

@ -2,7 +2,7 @@
#include "parser.hh"
#include "hash.hh"
#include "util.hh"
#include "store.hh"
#include "store-api.hh"
#include "derivations.hh"
#include "nixexpr-ast.hh"
@ -251,7 +251,7 @@ string coerceToString(EvalState & state, Expr e, PathSet & context,
if (state.srcToStore[path] != "")
dstPath = state.srcToStore[path];
else {
dstPath = addToStore(path);
dstPath = store->addToStore(path);
state.srcToStore[path] = dstPath;
printMsg(lvlChatty, format("copied source `%1%' -> `%2%'")
% path % dstPath);

6
src/libexpr/primops.cc
View file

@ -2,7 +2,7 @@
#include "misc.hh"
#include "eval.hh"
#include "globals.hh"
#include "store.hh"
#include "store-api.hh"
#include "util.hh"
#include "expr-to-xml.hh"
#include "nixexpr-ast.hh"
@ -46,7 +46,7 @@ static Expr primImport(EvalState & state, const ATermVector & args)
for (PathSet::iterator i = context.begin(); i != context.end(); ++i) {
assert(isStorePath(*i));
if (!isValidPath(*i))
if (!store->isValidPath(*i))
throw EvalError(format("cannot import `%1%', since path `%2%' is not valid")
% path % *i);
if (isDerivation(*i))
@ -390,7 +390,7 @@ static Expr primToFile(EvalState & state, const ATermVector & args)
refs.insert(*i);
}
Path storePath = addTextToStore(name, contents, refs);
Path storePath = store->addTextToStore(name, contents, refs);
/* Note: we don't need to add `context' to the context of the
result, since `storePath' itself has references to the paths

5
src/libmain/shared.cc
View file

@ -1,7 +1,7 @@
#include "shared.hh"
#include "globals.hh"
#include "gc.hh"
#include "store.hh"
#include "store-api.hh"
#include "util.hh"
#include "config.h"
@ -199,7 +199,8 @@ static void initAndRun(int argc, char * * argv)
run(remaining);
closeDB(); /* it's fine if the DB isn't actually open */
/* Close the Nix database. */
store.reset((StoreAPI *) 0);
}

8
src/libstore/Makefile.am
View file

@ -1,12 +1,12 @@
pkglib_LTLIBRARIES = libstore.la
libstore_la_SOURCES = \
store.cc derivations.cc build.cc misc.cc globals.cc db.cc \
references.cc pathlocks.cc gc.cc
store-api.cc local-store.cc derivations.cc build.cc misc.cc globals.cc \
db.cc references.cc pathlocks.cc gc.cc
pkginclude_HEADERS = \
store.hh derivations.hh build.hh misc.hh globals.hh db.hh \
references.hh pathlocks.hh gc.hh
store-api.hh local-store.cc derivations.hh build.hh misc.hh globals.hh \
db.hh references.hh pathlocks.hh gc.hh
libstore_la_LIBADD = ../libutil/libutil.la ../boost/format/libformat.la

32
src/libstore/build.cc
View file

@ -4,7 +4,7 @@
#include "misc.hh"
#include "globals.hh"
#include "gc.hh"
#include "store.hh"
#include "local-store.hh"
#include "db.hh"
#include "util.hh"
@ -636,7 +636,7 @@ void DerivationGoal::haveStoreExpr()
return;
}
assert(isValidPath(drvPath));
assert(store->isValidPath(drvPath));
/* Get the derivation. */
drv = derivationFromPath(drvPath);
@ -661,7 +661,7 @@ void DerivationGoal::haveStoreExpr()
i != invalidOutputs.end(); ++i)
/* Don't bother creating a substitution goal if there are no
substitutes. */
if (querySubstitutes(noTxn, *i).size() > 0)
if (store->querySubstitutes(*i).size() > 0)
addWaitee(worker.makeSubstitutionGoal(*i));
if (waitees.empty()) /* to prevent hang (no wake-up event) */
@ -916,7 +916,7 @@ static string makeValidityRegistration(const PathSet & paths,
s += deriver + "\n";
PathSet references;
queryReferences(noTxn, *i, references);
store->queryReferences(*i, references);
s += (format("%1%\n") % references.size()).str();
@ -1130,7 +1130,7 @@ bool DerivationGoal::prepareBuild()
/* Add the relevant output closures of the input derivation
`*i' as input paths. Only add the closures of output paths
that are specified as inputs. */
assert(isValidPath(i->first));
assert(store->isValidPath(i->first));
Derivation inDrv = derivationFromPath(i->first);
for (StringSet::iterator j = i->second.begin();
j != i->second.end(); ++j)
@ -1172,7 +1172,7 @@ void DerivationGoal::startBuilder()
i != drv.outputs.end(); ++i)
{
Path path = i->second.path;
if (isValidPath(path))
if (store->isValidPath(path))
throw Error(format("obstructed build: path `%1%' exists") % path);
if (pathExists(path)) {
debug(format("removing unregistered path `%1%'") % path);
@ -1259,7 +1259,7 @@ void DerivationGoal::startBuilder()
for (Strings::iterator i = ss.begin(); i != ss.end(); ) {
string fileName = *i++;
Path storePath = *i++;
if (!isValidPath(storePath))
if (!store->isValidPath(storePath))
throw Error(format("`exportReferencesGraph' refers to an invalid path `%1%'")
% storePath);
checkStoreName(fileName); /* !!! abuse of this function */
@ -1630,7 +1630,7 @@ PathSet DerivationGoal::checkPathValidity(bool returnValid)
PathSet result;
for (DerivationOutputs::iterator i = drv.outputs.begin();
i != drv.outputs.end(); ++i)
if (isValidPath(i->second.path)) {
if (store->isValidPath(i->second.path)) {
if (returnValid) result.insert(i->second.path);
} else {
if (!returnValid) result.insert(i->second.path);
@ -1718,17 +1718,21 @@ void SubstitutionGoal::init()
addTempRoot(storePath);
/* If the path already exists we're done. */
if (isValidPath(storePath)) {
if (store->isValidPath(storePath)) {
amDone();
return;
}
/* !!! race condition; should get the substitutes and the
references in a transaction (in case a clearSubstitutes() is
done simultaneously). */
/* Read the substitutes. */
subs = querySubstitutes(noTxn, storePath);
subs = store->querySubstitutes(storePath);
/* To maintain the closure invariant, we first have to realise the
paths referenced by this one. */
queryReferences(noTxn, storePath, references);
store->queryReferences(storePath, references);
for (PathSet::iterator i = references.begin();
i != references.end(); ++i)
@ -1752,7 +1756,7 @@ void SubstitutionGoal::referencesValid()
for (PathSet::iterator i = references.begin();
i != references.end(); ++i)
if (*i != storePath) /* ignore self-references */
assert(isValidPath(*i));
assert(store->isValidPath(*i));
tryNext();
}
@ -1796,7 +1800,7 @@ void SubstitutionGoal::tryToRun()
(format("waiting for lock on `%1%'") % storePath).str());
/* Check again whether the path is invalid. */
if (isValidPath(storePath)) {
if (store->isValidPath(storePath)) {
debug(format("store path `%1%' has become valid") % storePath);
outputLock->setDeletion(true);
amDone();
@ -2221,7 +2225,7 @@ void buildDerivations(const PathSet & drvPaths)
void ensurePath(const Path & path)
{
/* If the path is already valid, we're done. */
if (isValidPath(path)) return;
if (store->isValidPath(path)) return;
Worker worker;
GoalPtr goal = worker.makeSubstitutionGoal(path);

4
src/libstore/derivations.cc
View file

@ -1,5 +1,5 @@
#include "derivations.hh"
#include "store.hh"
#include "store-api.hh"
#include "aterm.hh"
#include "derivations-ast.hh"
@ -25,7 +25,7 @@ Path writeDerivation(const Derivation & drv, const string & name)
/* Note that the outputs of a derivation are *not* references
(that can be missing (of course) and should not necessarily be
held during a garbage collection). */
return addTextToStore(name + drvExtension,
return store->addTextToStore(name + drvExtension,
atPrint(unparseDerivation(drv)), references);
}

16
src/libstore/gc.cc
View file

@ -2,7 +2,7 @@
#include "globals.hh"
#include "misc.hh"
#include "pathlocks.hh"
#include "store.hh"
#include "local-store.hh"
#include "db.hh"
#include "util.hh"
@ -305,7 +305,7 @@ static void findRoots(const Path & path, bool recurseSymlinks,
debug(format("found root `%1%' in `%2%'")
% target2 % path);
Path target3 = toStorePath(target2);
if (isValidPath(target3))
if (store->isValidPath(target3))
roots.insert(target3);
else
printMsg(lvlInfo, format("skipping invalid root from `%1%' to `%2%'")
@ -343,7 +343,7 @@ static void addAdditionalRoots(PathSet & roots)
for (Strings::iterator i = paths.begin(); i != paths.end(); ++i) {
if (isInStore(*i)) {
Path path = toStorePath(*i);
if (roots.find(path) == roots.end() && isValidPath(path)) {
if (roots.find(path) == roots.end() && store->isValidPath(path)) {
debug(format("found additional root `%1%'") % path);
roots.insert(path);
}
@ -359,8 +359,8 @@ static void dfsVisit(const PathSet & paths, const Path & path,
visited.insert(path);
PathSet references;
if (isValidPath(path))
queryReferences(noTxn, path, references);
if (store->isValidPath(path))
store->queryReferences(path, references);
for (PathSet::iterator i = references.begin();
i != references.end(); ++i)
@ -431,7 +431,7 @@ void collectGarbage(GCAction action, const PathSet & pathsToDelete,
previously ran the collector with `gcKeepDerivations'
turned off). */
Path deriver = queryDeriver(noTxn, *i);
if (deriver != "" && isValidPath(deriver))
if (deriver != "" && store->isValidPath(deriver))
computeFSClosure(deriver, livePaths);
}
}
@ -444,7 +444,7 @@ void collectGarbage(GCAction action, const PathSet & pathsToDelete,
Derivation drv = derivationFromPath(*i);
for (DerivationOutputs::iterator j = drv.outputs.begin();
j != drv.outputs.end(); ++j)
if (isValidPath(j->second.path))
if (store->isValidPath(j->second.path))
computeFSClosure(j->second.path, livePaths);
}
}
@ -469,7 +469,7 @@ void collectGarbage(GCAction action, const PathSet & pathsToDelete,
means that it has already been closed). */
PathSet tempRootsClosed;
for (PathSet::iterator i = tempRoots.begin(); i != tempRoots.end(); ++i)
if (isValidPath(*i))
if (store->isValidPath(*i))
computeFSClosure(*i, tempRootsClosed);
else
tempRootsClosed.insert(*i);

124
src/libstore/store.cc → src/libstore/local-store.cc
View file

@ -1,4 +1,4 @@
#include "store.hh"
#include "local-store.hh"
#include "util.hh"
#include "globals.hh"
#include "db.hh"
@ -99,7 +99,7 @@ void checkStoreNotSymlink()
}
void openDB(bool reserveSpace)
LocalStore::LocalStore(bool reserveSpace)
{
if (readOnlyMode) return;
@ -156,12 +156,7 @@ void openDB(bool reserveSpace)
}
void initDB()
{
}
void closeDB()
LocalStore::~LocalStore()
{
/* If the database isn't open, this is a NOP. */
nixDB.close();
@ -221,60 +216,6 @@ void copyPath(const Path & src, const Path & dst)
}
bool isInStore(const Path & path)
{
return path[0] == '/'
&& string(path, 0, nixStore.size()) == nixStore
&& path.size() >= nixStore.size() + 2
&& path[nixStore.size()] == '/';
}
bool isStorePath(const Path & path)
{
return isInStore(path)
&& path.find('/', nixStore.size() + 1) == Path::npos;
}
void assertStorePath(const Path & path)
{
if (!isStorePath(path))
throw Error(format("path `%1%' is not in the Nix store") % path);
}
Path toStorePath(const Path & path)
{
if (!isInStore(path))
throw Error(format("path `%1%' is not in the Nix store") % path);
Path::size_type slash = path.find('/', nixStore.size() + 1);
if (slash == Path::npos)
return path;
else
return Path(path, 0, slash);
}
void checkStoreName(const string & name)
{
string validChars = "+-._?=";
/* Disallow names starting with a dot for possible security
reasons (e.g., "." and ".."). */
if (string(name, 0, 1) == ".")
throw Error(format("illegal name: `%1%'") % name);
for (string::const_iterator i = name.begin(); i != name.end(); ++i)
if (!((*i >= 'A' && *i <= 'Z') ||
(*i >= 'a' && *i <= 'z') ||
(*i >= '0' && *i <= '9') ||
validChars.find(*i) != string::npos))
{
throw Error(format("invalid character `%1%' in name `%2%'")
% *i % name);
}
}
void canonicalisePathMetaData(const Path & path)
{
checkInterrupt();
@ -327,7 +268,7 @@ bool isValidPathTxn(const Transaction & txn, const Path & path)
}
bool isValidPath(const Path & path)
bool LocalStore::isValidPath(const Path & path)
{
return isValidPathTxn(noTxn, path);
}
@ -416,6 +357,13 @@ void queryReferences(const Transaction & txn,
}
void LocalStore::queryReferences(const Path & storePath,
PathSet & references)
{
nix::queryReferences(noTxn, storePath, references);
}
void queryReferrers(const Transaction & txn,
const Path & storePath, PathSet & referrers)
{
@ -426,6 +374,13 @@ void queryReferrers(const Transaction & txn,
}
void LocalStore::queryReferrers(const Path & storePath,
PathSet & referrers)
{
nix::queryReferrers(noTxn, storePath, referrers);
}
void setDeriver(const Transaction & txn, const Path & storePath,
const Path & deriver)
{
@ -531,6 +486,12 @@ Substitutes querySubstitutes(const Transaction & txn, const Path & srcPath)
}
Substitutes LocalStore::querySubstitutes(const Path & srcPath)
{
return nix::querySubstitutes(noTxn, srcPath);
}
static void invalidatePath(Transaction & txn, const Path & path);
@ -584,7 +545,7 @@ static Hash queryHash(const Transaction & txn, const Path & storePath)
}
Hash queryPathHash(const Path & path)
Hash LocalStore::queryPathHash(const Path & path)
{
if (!isValidPath(path))
throw Error(format("path `%1%' is not valid") % path);
@ -657,34 +618,7 @@ static void invalidatePath(Transaction & txn, const Path & path)
}
Path makeStorePath(const string & type,
const Hash & hash, const string & suffix)
{
/* e.g., "source:sha256:1abc...:/nix/store:foo.tar.gz" */
string s = type + ":sha256:" + printHash(hash) + ":"
+ nixStore + ":" + suffix;
checkStoreName(suffix);
return nixStore + "/"
+ printHash32(compressHash(hashString(htSHA256, s), 20))
+ "-" + suffix;
}
Path makeFixedOutputPath(bool recursive,
string hashAlgo, Hash hash, string name)
{
/* !!! copy/paste from primops.cc */
Hash h = hashString(htSHA256, "fixed:out:"
+ (recursive ? (string) "r:" : "") + hashAlgo + ":"
+ printHash(hash) + ":"
+ "");
return makeStorePath("output:out", h, name);
}
static Path _addToStore(bool fixed, bool recursive,
Path LocalStore::_addToStore(bool fixed, bool recursive,
string hashAlgo, const Path & _srcPath)
{
Path srcPath(absPath(_srcPath));
@ -748,19 +682,19 @@ static Path _addToStore(bool fixed, bool recursive,
}
Path addToStore(const Path & srcPath)
Path LocalStore::addToStore(const Path & srcPath)
{
return _addToStore(false, false, "", srcPath);
}
Path addToStoreFixed(bool recursive, string hashAlgo, const Path & srcPath)
Path LocalStore::addToStoreFixed(bool recursive, string hashAlgo, const Path & srcPath)
{
return _addToStore(true, recursive, hashAlgo, srcPath);
}
Path addTextToStore(const string & suffix, const string & s,
Path LocalStore::addTextToStore(const string & suffix, const string & s,
const PathSet & references)
{
Hash hash = hashString(htSHA256, s);

136
src/libstore/local-store.hh Normal file
View file

@ -0,0 +1,136 @@
#ifndef __LOCAL_STORE_H
#define __LOCAL_STORE_H
#include <string>
#include "store-api.hh"
namespace nix {
class Transaction;
/* Nix store and database schema version. Version 1 (or 0) was Nix <=
0.7. Version 2 was Nix 0.8 and 0.8. Version 3 is Nix 0.10 and
up. */
const int nixSchemaVersion = 3;
class LocalStore : public StoreAPI
{
public:
/* Open the database environment. If `reserveSpace' is true, make
sure that a big empty file exists in /nix/var/nix/db/reserved.
If `reserveSpace' is false, delete this file if it exists. The
idea is that on normal operation, the file exists; but when we
run the garbage collector, it is deleted. This is to ensure
that the garbage collector has a small amount of disk space
available, which is required to open the Berkeley DB
environment. */
LocalStore(bool reserveSpace);
~LocalStore();
/* Implementations of abstract store API methods. */
bool isValidPath(const Path & path);
Substitutes querySubstitutes(const Path & srcPath);
Hash queryPathHash(const Path & path);
void queryReferences(const Path & storePath,
PathSet & references);
void queryReferrers(const Path & storePath,
PathSet & referrers);
Path addToStore(const Path & srcPath);
Path addToStoreFixed(bool recursive, string hashAlgo,
const Path & srcPath);
Path addTextToStore(const string & suffix, const string & s,
const PathSet & references);
private:
Path _addToStore(bool fixed, bool recursive,
string hashAlgo, const Path & _srcPath);
};
/* Get a transaction object. */
void createStoreTransaction(Transaction & txn);
/* Copy a path recursively. */
void copyPath(const Path & src, const Path & dst);
/* Register a substitute. */
void registerSubstitute(const Transaction & txn,
const Path & srcPath, const Substitute & sub);
/* Deregister all substitutes. */
void clearSubstitutes();
/* Register the validity of a path, i.e., that `path' exists, that the
paths referenced by it exists, and in the case of an output path of
a derivation, that it has been produced by a succesful execution of
the derivation (or something equivalent). Also register the hash
of the file system contents of the path. The hash must be a
SHA-256 hash. */
void registerValidPath(const Transaction & txn,
const Path & path, const Hash & hash, const PathSet & references,
const Path & deriver);
struct ValidPathInfo
{
Path path;
Path deriver;
Hash hash;
PathSet references;
};
typedef list<ValidPathInfo> ValidPathInfos;
void registerValidPaths(const Transaction & txn,
const ValidPathInfos & infos);
/* "Fix", or canonicalise, the meta-data of the files in a store path
after it has been built. In particular:
- the last modification date on each file is set to 0 (i.e.,
00:00:00 1/1/1970 UTC)
- the permissions are set of 444 or 555 (i.e., read-only with or
without execute permission; setuid bits etc. are cleared)
- the owner and group are set to the Nix user and group, if we're
in a setuid Nix installation. */
void canonicalisePathMetaData(const Path & path);
/* Checks whether a path is valid. */
bool isValidPathTxn(const Transaction & txn, const Path & path);
/* Sets the set of outgoing FS references for a store path. Use with
care! */
void setReferences(const Transaction & txn, const Path & storePath,
const PathSet & references);
/* Sets the deriver of a store path. Use with care! */
void setDeriver(const Transaction & txn, const Path & storePath,
const Path & deriver);
/* Query the deriver of a store path. Return the empty string if no
deriver has been set. */
Path queryDeriver(const Transaction & txn, const Path & storePath);
/* Delete a value from the nixStore directory. */
void deleteFromStore(const Path & path, unsigned long long & bytesFreed);
void verifyStore(bool checkContents);
}
#endif /* !__LOCAL_STORE_H */

18
src/libstore/misc.cc
View file

@ -1,5 +1,5 @@
#include "misc.hh"
#include "store.hh"
#include "store-api.hh"
#include "build.hh"
#include "db.hh"
@ -27,9 +27,9 @@ void computeFSClosure(const Path & storePath,
PathSet references;
if (flipDirection)
queryReferrers(noTxn, storePath, references);
store->queryReferrers(storePath, references);
else
queryReferences(noTxn, storePath, references);
store->queryReferences(storePath, references);
for (PathSet::iterator i = references.begin();
i != references.end(); ++i)
@ -58,14 +58,14 @@ void queryMissing(const PathSet & targets,
done.insert(p);
if (isDerivation(p)) {
if (!isValidPath(p)) continue;
if (!store->isValidPath(p)) continue;
Derivation drv = derivationFromPath(p);
bool mustBuild = false;
for (DerivationOutputs::iterator i = drv.outputs.begin();
i != drv.outputs.end(); ++i)
if (!isValidPath(i->second.path) &&
querySubstitutes(noTxn, i->second.path).size() == 0)
if (!store->isValidPath(i->second.path) &&
store->querySubstitutes(i->second.path).size() == 0)
mustBuild = true;
if (mustBuild) {
@ -81,11 +81,11 @@ void queryMissing(const PathSet & targets,
}
else {
if (isValidPath(p)) continue;
if (querySubstitutes(noTxn, p).size() > 0)
if (store->isValidPath(p)) continue;
if (store->querySubstitutes(p).size() > 0)
willSubstitute.insert(p);
PathSet refs;
queryReferences(noTxn, p, todo);
store->queryReferences(p, todo);
}
}
}

107
src/libstore/store-api.cc Normal file
View file

@ -0,0 +1,107 @@
#include "store-api.hh"
#include "globals.hh"
namespace nix {
bool isInStore(const Path & path)
{
return path[0] == '/'
&& string(path, 0, nixStore.size()) == nixStore
&& path.size() >= nixStore.size() + 2
&& path[nixStore.size()] == '/';
}
bool isStorePath(const Path & path)
{
return isInStore(path)
&& path.find('/', nixStore.size() + 1) == Path::npos;
}
void assertStorePath(const Path & path)
{
if (!isStorePath(path))
throw Error(format("path `%1%' is not in the Nix store") % path);
}
Path toStorePath(const Path & path)
{
if (!isInStore(path))
throw Error(format("path `%1%' is not in the Nix store") % path);
Path::size_type slash = path.find('/', nixStore.size() + 1);
if (slash == Path::npos)
return path;
else
return Path(path, 0, slash);
}
void checkStoreName(const string & name)
{
string validChars = "+-._?=";
/* Disallow names starting with a dot for possible security
reasons (e.g., "." and ".."). */
if (string(name, 0, 1) == ".")
throw Error(format("illegal name: `%1%'") % name);
for (string::const_iterator i = name.begin(); i != name.end(); ++i)
if (!((*i >= 'A' && *i <= 'Z') ||
(*i >= 'a' && *i <= 'z') ||
(*i >= '0' && *i <= '9') ||
validChars.find(*i) != string::npos))
{
throw Error(format("invalid character `%1%' in name `%2%'")
% *i % name);
}
}
Path makeStorePath(const string & type,
const Hash & hash, const string & suffix)
{
/* e.g., "source:sha256:1abc...:/nix/store:foo.tar.gz" */
string s = type + ":sha256:" + printHash(hash) + ":"
+ nixStore + ":" + suffix;
checkStoreName(suffix);
return nixStore + "/"
+ printHash32(compressHash(hashString(htSHA256, s), 20))
+ "-" + suffix;
}
Path makeFixedOutputPath(bool recursive,
string hashAlgo, Hash hash, string name)
{
/* !!! copy/paste from primops.cc */
Hash h = hashString(htSHA256, "fixed:out:"
+ (recursive ? (string) "r:" : "") + hashAlgo + ":"
+ printHash(hash) + ":"
+ "");
return makeStorePath("output:out", h, name);
}
}
#include "local-store.hh"
namespace nix {
boost::shared_ptr<StoreAPI> store;
boost::shared_ptr<StoreAPI> openStore(bool reserveSpace)
{
return boost::shared_ptr<StoreAPI>(new LocalStore(reserveSpace));
}
}

115
src/libstore/store-api.hh Normal file
View file

@ -0,0 +1,115 @@
#ifndef __STOREAPI_H
#define __STOREAPI_H
#include <string>
#include <boost/shared_ptr.hpp>
#include "hash.hh"
namespace nix {
/* A substitute is a program invocation that constructs some store
path (typically by fetching it from somewhere, e.g., from the
network). */
struct Substitute
{
/* The derivation that built this store path (empty if none). */
Path deriver;
/* Program to be executed to create the store path. Must be in
the output path of `storeExpr'. */
Path program;
/* Extra arguments to be passed to the program (the first argument
is the store path to be substituted). */
Strings args;
bool operator == (const Substitute & sub) const;
};
typedef list<Substitute> Substitutes;
class StoreAPI
{
public:
virtual ~StoreAPI() { }
/* Checks whether a path is valid. */
virtual bool isValidPath(const Path & path) = 0;
/* Return the substitutes for the given path. */
virtual Substitutes querySubstitutes(const Path & srcPath) = 0;
/* Queries the hash of a valid path. */
virtual Hash queryPathHash(const Path & path) = 0;
/* Queries the set of outgoing FS references for a store path.
The result is not cleared. */
virtual void queryReferences(const Path & storePath,
PathSet & references) = 0;
/* Queries the set of incoming FS references for a store path.
The result is not cleared. */
virtual void queryReferrers(const Path & storePath,
PathSet & referrers) = 0;
/* Copy the contents of a path to the store and register the
validity the resulting path. The resulting path is
returned. */
virtual Path addToStore(const Path & srcPath) = 0;
/* Like addToStore(), but for pre-adding the outputs of
fixed-output derivations. */
virtual Path addToStoreFixed(bool recursive, string hashAlgo,
const Path & srcPath) = 0;
/* Like addToStore, but the contents written to the output path is
a regular file containing the given string. */
virtual Path addTextToStore(const string & suffix, const string & s,
const PathSet & references) = 0;
};
/* !!! These should be part of the store API, I guess. */
/* Throw an exception if `path' is not directly in the Nix store. */
void assertStorePath(const Path & path);
bool isInStore(const Path & path);
bool isStorePath(const Path & path);
void checkStoreName(const string & name);
/* Chop off the parts after the top-level store name, e.g.,
/nix/store/abcd-foo/bar => /nix/store/abcd-foo. */
Path toStorePath(const Path & path);
/* Constructs a unique store path name. */
Path makeStorePath(const string & type,
const Hash & hash, const string & suffix);
Path makeFixedOutputPath(bool recursive,
string hashAlgo, Hash hash, string name);
/* For now, there is a single global store API object, but we'll
purify that in the future. */
extern boost::shared_ptr<StoreAPI> store;
/* Factory method: open the Nix database, either through the local or
remote implementation. */
boost::shared_ptr<StoreAPI> openStore(bool reserveSpace = true);
}
#endif /* !__STOREAPI_H */

178
src/libstore/store.hh
View file

@ -1,178 +0,0 @@
#ifndef __STORE_H
#define __STORE_H
#include <string>
#include "hash.hh"
namespace nix {
class Transaction;
/* Nix store and database schema version. Version 1 (or 0) was Nix <=
0.7. Version 2 was Nix 0.8 and 0.8. Version 3 is Nix 0.10 and
up. */
const int nixSchemaVersion = 3;
/* A substitute is a program invocation that constructs some store
path (typically by fetching it from somewhere, e.g., from the
network). */
struct Substitute
{
/* The derivation that built this store path (empty if none). */
Path deriver;
/* Program to be executed to create the store path. Must be in
the output path of `storeExpr'. */
Path program;
/* Extra arguments to be passed to the program (the first argument
is the store path to be substituted). */
Strings args;
bool operator == (const Substitute & sub) const;
};
typedef list<Substitute> Substitutes;
/* Open the database environment. If `reserveSpace' is true, make
sure that a big empty file exists in /nix/var/nix/db/reserved. If
`reserveSpace' is false, delete this file if it exists. The idea
is that on normal operation, the file exists; but when we run the
garbage collector, it is deleted. This is to ensure that the
garbage collector has a small amount of disk space available, which
is required to open the Berkeley DB environment. */
void openDB(bool reserveSpace = true);
/* Create the required database tables. */
void initDB();
/* Close the database. */
void closeDB();
/* Get a transaction object. */
void createStoreTransaction(Transaction & txn);
/* Copy a path recursively. */
void copyPath(const Path & src, const Path & dst);
/* Register a substitute. */
void registerSubstitute(const Transaction & txn,
const Path & srcPath, const Substitute & sub);
/* Return the substitutes for the given path. */
Substitutes querySubstitutes(const Transaction & txn, const Path & srcPath);
/* Deregister all substitutes. */
void clearSubstitutes();
/* Register the validity of a path, i.e., that `path' exists, that the
paths referenced by it exists, and in the case of an output path of
a derivation, that it has been produced by a succesful execution of
the derivation (or something equivalent). Also register the hash
of the file system contents of the path. The hash must be a
SHA-256 hash. */
void registerValidPath(const Transaction & txn,
const Path & path, const Hash & hash, const PathSet & references,
const Path & deriver);
struct ValidPathInfo
{
Path path;
Path deriver;
Hash hash;
PathSet references;
};
typedef list<ValidPathInfo> ValidPathInfos;
void registerValidPaths(const Transaction & txn,
const ValidPathInfos & infos);
/* Throw an exception if `path' is not directly in the Nix store. */
void assertStorePath(const Path & path);
bool isInStore(const Path & path);
bool isStorePath(const Path & path);
void checkStoreName(const string & name);
/* Chop off the parts after the top-level store name, e.g.,
/nix/store/abcd-foo/bar => /nix/store/abcd-foo. */
Path toStorePath(const Path & path);
/* "Fix", or canonicalise, the meta-data of the files in a store path
after it has been built. In particular:
- the last modification date on each file is set to 0 (i.e.,
00:00:00 1/1/1970 UTC)
- the permissions are set of 444 or 555 (i.e., read-only with or
without execute permission; setuid bits etc. are cleared)
- the owner and group are set to the Nix user and group, if we're
in a setuid Nix installation. */
void canonicalisePathMetaData(const Path & path);
/* Checks whether a path is valid. */
bool isValidPathTxn(const Transaction & txn, const Path & path);
bool isValidPath(const Path & path);
/* Queries the hash of a valid path. */
Hash queryPathHash(const Path & path);
/* Sets the set of outgoing FS references for a store path. Use with
care! */
void setReferences(const Transaction & txn, const Path & storePath,
const PathSet & references);
/* Queries the set of outgoing FS references for a store path. The
result is not cleared. */
void queryReferences(const Transaction & txn,
const Path & storePath, PathSet & references);
/* Queries the set of incoming FS references for a store path. The
result is not cleared. */
void queryReferrers(const Transaction & txn,
const Path & storePath, PathSet & referrers);
/* Sets the deriver of a store path. Use with care! */
void setDeriver(const Transaction & txn, const Path & storePath,
const Path & deriver);
/* Query the deriver of a store path. Return the empty string if no
deriver has been set. */
Path queryDeriver(const Transaction & txn, const Path & storePath);
/* Constructs a unique store path name. */
Path makeStorePath(const string & type,
const Hash & hash, const string & suffix);
/* Copy the contents of a path to the store and register the validity
the resulting path. The resulting path is returned. */
Path addToStore(const Path & srcPath);
/* Like addToStore(), but for pre-adding the outputs of fixed-output
derivations. */
Path addToStoreFixed(bool recursive, string hashAlgo, const Path & srcPath);
Path makeFixedOutputPath(bool recursive,
string hashAlgo, Hash hash, string name);
/* Like addToStore, but the contents written to the output path is a
regular file containing the given string. */
Path addTextToStore(const string & suffix, const string & s,
const PathSet & references);
/* Delete a value from the nixStore directory. */
void deleteFromStore(const Path & path, unsigned long long & bytesFreed);
void verifyStore(bool checkContents);
}
#endif /* !__STORE_H */

10
src/nix-env/main.cc
View file

@ -13,7 +13,7 @@
#include "attr-path.hh"
#include "pathlocks.hh"
#include "xml-writer.hh"
#include "store.hh"
#include "store-api.hh"
#include "db.hh"
#include "util.hh"
@ -192,7 +192,7 @@ static void createUserEnv(EvalState & state, const DrvInfos & elems,
/* Also write a copy of the list of inputs to the store; we need
it for future modifications of the environment. */
Path manifestFile = addTextToStore("env-manifest",
Path manifestFile = store->addTextToStore("env-manifest",
atPrint(makeList(ATreverse(manifest))), references);
Expr topLevel = makeCall(envBuilder, makeAttrs(ATmakeList3(
@ -833,9 +833,9 @@ static void opQuery(Globals & globals,
XMLAttrs attrs;
if (printStatus) {
Substitutes subs = querySubstitutes(noTxn, i->queryOutPath(globals.state));
Substitutes subs = store->querySubstitutes(i->queryOutPath(globals.state));
bool isInstalled = installed.find(i->queryOutPath(globals.state)) != installed.end();
bool isValid = isValidPath(i->queryOutPath(globals.state));
bool isValid = store->isValidPath(i->queryOutPath(globals.state));
if (xmlOutput) {
attrs["installed"] = isInstalled ? "1" : "0";
attrs["valid"] = isValid ? "1" : "0";
@ -1204,7 +1204,7 @@ void run(Strings args)
: canonPath(nixStateDir + "/profiles/default");
}
openDB();
store = openStore();
op(globals, opFlags, opArgs);

4
src/nix-instantiate/main.cc
View file

@ -11,7 +11,7 @@
#include "attr-path.hh"
#include "expr-to-xml.hh"
#include "util.hh"
#include "store.hh"
#include "store-api.hh"
#include "help.txt.hh"
@ -137,7 +137,7 @@ void run(Strings args)
files.push_back(arg);
}
openDB();
store = openStore();
if (readStdin) {
Expr e = parseStdin(state);

4
src/nix-store/dotgraph.cc
View file

@ -1,6 +1,6 @@
#include "dotgraph.hh"
#include "util.hh"
#include "store.hh"
#include "store-api.hh"
#include "db.hh"
#include <iostream>
@ -112,7 +112,7 @@ void printDotGraph(const PathSet & roots)
cout << makeNode(path, symbolicName(path), "#ff0000");
PathSet references;
queryReferences(noTxn, path, references);
store->queryReferences(path, references);
for (PathSet::iterator i = references.begin();
i != references.end(); ++i)

25
src/nix-store/main.cc
View file

@ -8,7 +8,7 @@
#include "archive.hh"
#include "shared.hh"
#include "dotgraph.hh"
#include "store.hh"
#include "local-store.hh"
#include "db.hh"
#include "util.hh"
#include "help.txt.hh"
@ -112,7 +112,7 @@ static void opAdd(Strings opFlags, Strings opArgs)
if (!opFlags.empty()) throw UsageError("unknown flag");
for (Strings::iterator i = opArgs.begin(); i != opArgs.end(); ++i)
cout << format("%1%\n") % addToStore(*i);
cout << format("%1%\n") % store->addToStore(*i);
}
@ -134,7 +134,7 @@ static void opAddFixed(Strings opFlags, Strings opArgs)
opArgs.pop_front();
for (Strings::iterator i = opArgs.begin(); i != opArgs.end(); ++i)
cout << format("%1%\n") % addToStoreFixed(recursive, hashAlgo, *i);
cout << format("%1%\n") % store->addToStoreFixed(recursive, hashAlgo, *i);
}
@ -195,7 +195,7 @@ static void storePathRequisites(const Path & storePath,
Derivation drv = derivationFromPath(*i);
for (DerivationOutputs::iterator j = drv.outputs.begin();
j != drv.outputs.end(); ++j)
if (isValidPath(j->second.path))
if (store->isValidPath(j->second.path))
computeFSClosure(j->second.path, paths);
}
}
@ -270,7 +270,7 @@ static void printTree(const Path & path,
cout << format("%1%%2%\n") % firstPad % path;
PathSet references;
queryReferences(noTxn, path, references);
store->queryReferences(path, references);
#if 0
for (PathSet::iterator i = drv.inputSrcs.begin();
@ -353,8 +353,8 @@ static void opQuery(Strings opFlags, Strings opArgs)
Path path = maybeUseOutput(fixPath(*i), useOutput, forceRealise);
if (query == qRequisites)
storePathRequisites(path, includeOutputs, paths);
else if (query == qReferences) queryReferences(noTxn, path, paths);
else if (query == qReferrers) queryReferrers(noTxn, path, paths);
else if (query == qReferences) store->queryReferences(path, paths);
else if (query == qReferrers) store->queryReferrers(path, paths);
else if (query == qReferrersClosure) computeFSClosure(path, paths, true);
}
printPathSet(paths);
@ -390,7 +390,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
i != opArgs.end(); ++i)
{
Path path = maybeUseOutput(fixPath(*i), useOutput, forceRealise);
Hash hash = queryPathHash(path);
Hash hash = store->queryPathHash(path);
assert(hash.type == htSHA256);
cout << format("sha256:%1%\n") % printHash32(hash);
}
@ -515,7 +515,7 @@ static void opRegisterValidity(Strings opFlags, Strings opArgs)
info.references.insert(s);
}
if (!cin || cin.eof()) throw Error("missing input");
if (!isValidPath(info.path) || reregister) {
if (!store->isValidPath(info.path) || reregister) {
/* !!! races */
canonicalisePathMetaData(info.path);
info.hash = hashPath(htSHA256, info.path);
@ -536,7 +536,7 @@ static void opCheckValidity(Strings opFlags, Strings opArgs)
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); ++i)
if (!isValidPath(*i))
if (!store->isValidPath(*i))
throw Error(format("path `%1%' is not valid") % *i);
}
@ -660,7 +660,8 @@ static void opInit(Strings opFlags, Strings opArgs)
if (!opFlags.empty()) throw UsageError("unknown flag");
if (!opArgs.empty())
throw UsageError("no arguments expected");
initDB();
/* Doesn't do anything right now; database tables are initialised
automatically. */
}
@ -745,7 +746,7 @@ void run(Strings args)
if (!op) throw UsageError("no operation specified");
if (op != opDump && op != opRestore) /* !!! hack */
openDB(op != opGC);
store = openStore(op != opGC);
op(opFlags, opArgs);
}