forked from lix-project/lix
* Simplify the substitute mechanism:
- Drop the store expression. So now a substitute is just a
command-line invocation (a program name + arguments). If you
register a substitute you are responsible for registering the
expression that built it (if any) as a root of the garbage
collector.
- Drop the substitutes-rev DB table.
This commit is contained in:
Eelco Dolstra
parent
015beb7cd0
commit
fa9259f5f5
|
|
@ -1416,9 +1416,6 @@ private:
|
|||
/* The current substitute. */
|
||||
Substitute sub;
|
||||
|
||||
/* The normal form of the substitute store expression. */
|
||||
Path nfSub;
|
||||
|
||||
/* Pipe for the substitute's standard output/error. */
|
||||
Pipe logPipe;
|
||||
|
||||
|
|
@ -1440,8 +1437,6 @@ public:
|
|||
/* The states. */
|
||||
void init();
|
||||
void tryNext();
|
||||
void exprNormalised();
|
||||
void exprRealised();
|
||||
void tryToRun();
|
||||
void finished();
|
||||
|
||||
|
|
@ -1506,26 +1501,7 @@ void SubstitutionGoal::tryNext()
|
|||
sub = subs.front();
|
||||
subs.pop_front();
|
||||
|
||||
/* Realise the substitute store expression. */
|
||||
nrFailed = 0;
|
||||
addWaitee(worker.makeRealisationGoal(sub.storeExpr));
|
||||
|
||||
state = &SubstitutionGoal::exprRealised;
|
||||
}
|
||||
|
||||
|
||||
void SubstitutionGoal::exprRealised()
|
||||
{
|
||||
trace("substitute store expression realised");
|
||||
|
||||
if (nrFailed != 0) {
|
||||
tryNext();
|
||||
return;
|
||||
}
|
||||
|
||||
/* !!! the storeExpr doesn't have to be a derivation, right? */
|
||||
nfSub = queryNormalForm(sub.storeExpr);
|
||||
|
||||
/* Wait until we can run the substitute program. */
|
||||
state = &SubstitutionGoal::tryToRun;
|
||||
worker.waitForBuildSlot(shared_from_this());
|
||||
}
|
||||
|
|
@ -1557,15 +1533,8 @@ void SubstitutionGoal::tryToRun()
|
|||
|
||||
printMsg(lvlInfo,
|
||||
format("substituting path `%1%' using substituter `%2%'")
|
||||
% storePath % sub.storeExpr);
|
||||
% storePath % sub.program);
|
||||
|
||||
/* What's the substitute program? */
|
||||
StoreExpr expr = storeExprFromPath(nfSub);
|
||||
assert(expr.type == StoreExpr::neClosure);
|
||||
assert(!expr.closure.roots.empty());
|
||||
Path program =
|
||||
canonPath(*expr.closure.roots.begin() + "/" + sub.program);
|
||||
|
||||
logPipe.create();
|
||||
|
||||
/* Remove the (stale) output path if it exists. */
|
||||
|
|
@ -1591,12 +1560,12 @@ void SubstitutionGoal::tryToRun()
|
|||
/* Fill in the arguments. */
|
||||
Strings args(sub.args);
|
||||
args.push_front(storePath);
|
||||
args.push_front(baseNameOf(program));
|
||||
args.push_front(baseNameOf(sub.program));
|
||||
const char * * argArr = strings2CharPtrs(args);
|
||||
|
||||
execv(program.c_str(), (char * *) argArr);
|
||||
execv(sub.program.c_str(), (char * *) argArr);
|
||||
|
||||
throw SysError(format("executing `%1%'") % program);
|
||||
throw SysError(format("executing `%1%'") % sub.program);
|
||||
|
||||
} catch (exception & e) {
|
||||
cerr << format("substitute error: %1%\n") % e.what();
|
||||
|
|
@ -1648,7 +1617,7 @@ void SubstitutionGoal::finished()
|
|||
|
||||
printMsg(lvlInfo,
|
||||
format("substitution of path `%1%' using substituter `%2%' failed: %3%")
|
||||
% storePath % sub.storeExpr % e.msg());
|
||||
% storePath % sub.program % e.msg());
|
||||
|
||||
/* Try the next substitute. */
|
||||
state = &SubstitutionGoal::tryNext;
|
||||
|
|
|
|||
|
|
@ -41,12 +41,13 @@ static TableId dbSuccessors = 0;
|
|||
*/
|
||||
static TableId dbSuccessorsRev = 0;
|
||||
|
||||
/* dbSubstitutes :: Path -> [(Path, Path, [string])]
|
||||
/* dbSubstitutes :: Path -> [[Path]]
|
||||
|
||||
Each pair $(p, subs)$ tells Nix that it can use any of the
|
||||
substitutes in $subs$ to build path $p$. Each substitute is a
|
||||
tuple $(storeExpr, program, args)$ (see the type `Substitute' in
|
||||
`store.hh').
|
||||
substitutes in $subs$ to build path $p$. Each substitute defines a
|
||||
command-line invocation of a program (i.e., the first list element
|
||||
is the full path to the program, the remaining elements are
|
||||
arguments).
|
||||
|
||||
The main purpose of this is for distributed caching of derivates.
|
||||
One system can compute a derivate and put it on a website (as a Nix
|
||||
|
|
@ -56,18 +57,10 @@ static TableId dbSuccessorsRev = 0;
|
|||
*/
|
||||
static TableId dbSubstitutes = 0;
|
||||
|
||||
/* dbSubstitutesRev :: Path -> [Path]
|
||||
|
||||
The reverse mapping of dbSubstitutes; it maps store expressions
|
||||
back to the paths for which they are substitutes.
|
||||
*/
|
||||
static TableId dbSubstitutesRev = 0;
|
||||
|
||||
|
||||
bool Substitute::operator == (const Substitute & sub)
|
||||
{
|
||||
return storeExpr == sub.storeExpr
|
||||
&& program == sub.program
|
||||
return program == sub.program
|
||||
&& args == sub.args;
|
||||
}
|
||||
|
||||
|
|
@ -86,7 +79,6 @@ void openDB()
|
|||
dbSuccessors = nixDB.openTable("successors");
|
||||
dbSuccessorsRev = nixDB.openTable("successors-rev");
|
||||
dbSubstitutes = nixDB.openTable("substitutes");
|
||||
dbSubstitutesRev = nixDB.openTable("substitutes-rev");
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -300,10 +292,13 @@ static Substitutes readSubstitutes(const Transaction & txn,
|
|||
break;
|
||||
}
|
||||
Strings ss2 = unpackStrings(*i);
|
||||
if (ss2.size() != 3) throw Error("malformed substitute");
|
||||
if (ss2.size() == 3) {
|
||||
/* Another old-style substitute. */
|
||||
continue;
|
||||
}
|
||||
if (ss2.size() != 2) throw Error("malformed substitute");
|
||||
Strings::iterator j = ss2.begin();
|
||||
Substitute sub;
|
||||
sub.storeExpr = *j++;
|
||||
sub.program = *j++;
|
||||
sub.args = unpackStrings(*j++);
|
||||
subs.push_back(sub);
|
||||
|
|
@ -322,7 +317,6 @@ static void writeSubstitutes(const Transaction & txn,
|
|||
i != subs.end(); ++i)
|
||||
{
|
||||
Strings ss2;
|
||||
ss2.push_back(i->storeExpr);
|
||||
ss2.push_back(i->program);
|
||||
ss2.push_back(packStrings(i->args));
|
||||
ss.push_back(packStrings(ss2));
|
||||
|
|
@ -332,14 +326,9 @@ static void writeSubstitutes(const Transaction & txn,
|
|||
}
|
||||
|
||||
|
||||
typedef map<Path, Paths> SubstitutesRev;
|
||||
|
||||
|
||||
void registerSubstitutes(const Transaction & txn,
|
||||
const SubstitutePairs & subPairs)
|
||||
{
|
||||
SubstitutesRev revMap;
|
||||
|
||||
for (SubstitutePairs::const_iterator i = subPairs.begin();
|
||||
i != subPairs.end(); ++i)
|
||||
{
|
||||
|
|
@ -347,7 +336,6 @@ void registerSubstitutes(const Transaction & txn,
|
|||
const Substitute & sub(i->second);
|
||||
|
||||
assertStorePath(srcPath);
|
||||
assertStorePath(sub.storeExpr);
|
||||
|
||||
Substitutes subs = readSubstitutes(txn, srcPath);
|
||||
|
||||
|
|
@ -357,19 +345,7 @@ void registerSubstitutes(const Transaction & txn,
|
|||
subs.push_front(sub);
|
||||
|
||||
writeSubstitutes(txn, srcPath, subs);
|
||||
|
||||
Paths & revs = revMap[sub.storeExpr];
|
||||
if (revs.empty())
|
||||
nixDB.queryStrings(txn, dbSubstitutesRev, sub.storeExpr, revs);
|
||||
if (find(revs.begin(), revs.end(), srcPath) == revs.end())
|
||||
revs.push_back(srcPath);
|
||||
}
|
||||
|
||||
/* Re-write the reverse mapping in one go to prevent Theta(n^2)
|
||||
performance. (This would occur because the data fields of the
|
||||
`substitutes-rev' table are lists). */
|
||||
for (SubstitutesRev::iterator i = revMap.begin(); i != revMap.end(); ++i)
|
||||
nixDB.setStrings(txn, dbSubstitutesRev, i->first, i->second);
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -379,6 +355,12 @@ Substitutes querySubstitutes(const Path & srcPath)
|
|||
}
|
||||
|
||||
|
||||
void clearSubstitutes()
|
||||
{
|
||||
|
||||
}
|
||||
|
||||
|
||||
void registerValidPath(const Transaction & txn, const Path & _path)
|
||||
{
|
||||
Path path(canonPath(_path));
|
||||
|
|
@ -401,28 +383,6 @@ static void invalidatePath(const Path & path, Transaction & txn)
|
|||
for (Paths::iterator i = revs.begin(); i != revs.end(); ++i)
|
||||
nixDB.delPair(txn, dbSuccessors, *i);
|
||||
nixDB.delPair(txn, dbSuccessorsRev, path);
|
||||
|
||||
/* Remove any substitute mappings to this path. */
|
||||
revs.clear();
|
||||
nixDB.queryStrings(txn, dbSubstitutesRev, path, revs);
|
||||
for (Paths::iterator i = revs.begin(); i != revs.end(); ++i) {
|
||||
Substitutes subs = readSubstitutes(txn, *i), subs2;
|
||||
bool found = false;
|
||||
for (Substitutes::iterator j = subs.begin(); j != subs.end(); ++j)
|
||||
if (j->storeExpr != path)
|
||||
subs2.push_back(*j);
|
||||
else
|
||||
found = true;
|
||||
// !!! if (!found) throw Error("integrity error in substitutes mapping");
|
||||
writeSubstitutes(txn, *i, subs);
|
||||
|
||||
/* If path *i now has no substitutes left, and is not valid,
|
||||
then it too should be invalidated. This is because it may
|
||||
be a substitute or successor. */
|
||||
if (subs.size() == 0 && !isValidPathTxn(*i, txn))
|
||||
invalidatePath(*i, txn);
|
||||
}
|
||||
nixDB.delPair(txn, dbSubstitutesRev, path);
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -548,32 +508,11 @@ void verifyStore()
|
|||
Paths subKeys;
|
||||
nixDB.enumTable(txn, dbSubstitutes, subKeys);
|
||||
for (Paths::iterator i = subKeys.begin(); i != subKeys.end(); ++i) {
|
||||
Substitutes subs = readSubstitutes(txn, *i), subs2;
|
||||
for (Substitutes::iterator j = subs.begin(); j != subs.end(); ++j)
|
||||
if (validPaths.find(j->storeExpr) == validPaths.end())
|
||||
printMsg(lvlError,
|
||||
format("found substitute mapping to non-existent path `%1%'")
|
||||
% j->storeExpr);
|
||||
else
|
||||
subs2.push_back(*j);
|
||||
if (subs.size() != subs2.size())
|
||||
writeSubstitutes(txn, *i, subs2);
|
||||
if (subs2.size() > 0)
|
||||
Substitutes subs = readSubstitutes(txn, *i);
|
||||
if (subs.size() > 0)
|
||||
usablePaths.insert(*i);
|
||||
}
|
||||
|
||||
/* Check that the keys of the reverse substitute mappings are
|
||||
valid paths. */
|
||||
Paths rsubKeys;
|
||||
nixDB.enumTable(txn, dbSubstitutesRev, rsubKeys);
|
||||
for (Paths::iterator i = rsubKeys.begin(); i != rsubKeys.end(); ++i) {
|
||||
if (validPaths.find(*i) == validPaths.end()) {
|
||||
printMsg(lvlError,
|
||||
format("found reverse substitute mapping for non-existent path `%1%'") % *i);
|
||||
nixDB.delPair(txn, dbSubstitutesRev, *i);
|
||||
}
|
||||
}
|
||||
|
||||
/* Check that the values of the successor mappings are usable
|
||||
paths. */
|
||||
Paths sucKeys;
|
||||
|
|
|
|||
|
|
@ -14,10 +14,6 @@ using namespace std;
|
|||
network). */
|
||||
struct Substitute
|
||||
{
|
||||
/* Store expression to be normalised and realised in order to
|
||||
obtain `program'. */
|
||||
Path storeExpr;
|
||||
|
||||
/* Program to be executed to create the store path. Must be in
|
||||
the output path of `storeExpr'. */
|
||||
Path program;
|
||||
|
|
@ -73,6 +69,9 @@ void registerSubstitutes(const Transaction & txn,
|
|||
/* Return the substitutes expression for the given path. */
|
||||
Substitutes querySubstitutes(const Path & srcPath);
|
||||
|
||||
/* Deregister all substitutes. */
|
||||
void clearSubstitutes();
|
||||
|
||||
/* Register the validity of a path. */
|
||||
void registerValidPath(const Transaction & txn, const Path & path);
|
||||
|
||||
|
|
|
|||
|
|
@ -11,6 +11,7 @@ Operations:
|
|||
|
||||
--successor: register a successor expression (dangerous!)
|
||||
--substitute: register a substitute expression (dangerous!)
|
||||
--clear-substitute: clear all substitutes
|
||||
--validpath: register path validity (dangerous!)
|
||||
--isvalid: check path validity
|
||||
|
||||
|
|
|
|||
|
|
@ -166,7 +166,6 @@ static void opSubstitute(Strings opFlags, Strings opArgs)
|
|||
Substitute sub;
|
||||
getline(cin, srcPath);
|
||||
if (cin.eof()) break;
|
||||
getline(cin, sub.storeExpr);
|
||||
getline(cin, sub.program);
|
||||
string s;
|
||||
getline(cin, s);
|
||||
|
|
@ -186,6 +185,17 @@ static void opSubstitute(Strings opFlags, Strings opArgs)
|
|||
}
|
||||
|
||||
|
||||
static void opClearSubstitutes(Strings opFlags, Strings opArgs)
|
||||
{
|
||||
if (!opFlags.empty()) throw UsageError("unknown flag");
|
||||
if (!opArgs.empty())
|
||||
throw UsageError("no arguments expected");
|
||||
|
||||
clearSubstitutes();
|
||||
}
|
||||
|
||||
|
||||
|
||||
static void opValidPath(Strings opFlags, Strings opArgs)
|
||||
{
|
||||
if (!opFlags.empty()) throw UsageError("unknown flag");
|
||||
|
|
@ -354,6 +364,8 @@ void run(Strings args)
|
|||
op = opSuccessor;
|
||||
else if (arg == "--substitute")
|
||||
op = opSubstitute;
|
||||
else if (arg == "--clear-substitutes")
|
||||
op = opClearSubstitutes;
|
||||
else if (arg == "--validpath")
|
||||
op = opValidPath;
|
||||
else if (arg == "--isvalid")
|
||||
|
|
|
|||
Loading…
Reference in a new issue