lix/src/nix-store/main.cc

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#include <iostream>
#include <sstream>
#include "globals.hh"
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#include "normalise.hh"
#include "gc.hh"
#include "archive.hh"
#include "shared.hh"
#include "dotgraph.hh"
#include "help.txt.hh"
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typedef void (* Operation) (Strings opFlags, Strings opArgs);
void printHelp()
{
cout << string((char *) helpText, sizeof helpText);
}
/* Realise paths from the given store expressions. */
static void opRealise(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
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for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); i++)
{
Path nfPath = realiseStoreExpr(*i);
cout << format("%1%\n") % (string) nfPath;
}
}
/* Add paths to the Nix values directory and print the hashes of those
paths. */
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);
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}
Path maybeNormalise(const Path & ne, bool normalise, bool realise)
{
if (realise) {
Path ne2 = realiseStoreExpr(ne);
return normalise ? ne2 : ne;
} else
return normalise ? normaliseStoreExpr(ne) : ne;
}
/* Perform various sorts of queries. */
static void opQuery(Strings opFlags, Strings opArgs)
{
enum { qList, qRequisites, qPredecessors, qGraph
} query = qList;
bool normalise = false;
bool realise = false;
bool includeExprs = true;
bool includeSuccessors = false;
for (Strings::iterator i = opFlags.begin();
i != opFlags.end(); i++)
if (*i == "--list" || *i == "-l") query = qList;
else if (*i == "--requisites" || *i == "-R") query = qRequisites;
else if (*i == "--predecessors") query = qPredecessors;
else if (*i == "--graph") query = qGraph;
else if (*i == "--normalise" || *i == "-n") normalise = true;
else if (*i == "--force-realise" || *i == "-f") realise = true;
else if (*i == "--exclude-exprs") includeExprs = false;
else if (*i == "--include-successors") includeSuccessors = true;
else throw UsageError(format("unknown flag `%1%'") % *i);
switch (query) {
case qList: {
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); i++)
{
StringSet paths = storeExprRoots(
maybeNormalise(*i, normalise, realise));
for (StringSet::iterator j = paths.begin();
j != paths.end(); j++)
cout << format("%s\n") % *j;
}
break;
}
case qRequisites: {
StringSet paths;
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); i++)
{
StringSet paths2 = storeExprRequisites(
maybeNormalise(*i, normalise, realise),
includeExprs, includeSuccessors);
paths.insert(paths2.begin(), paths2.end());
}
for (StringSet::iterator i = paths.begin();
i != paths.end(); i++)
cout << format("%s\n") % *i;
break;
}
case qPredecessors: {
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); i++)
{
Paths preds = queryPredecessors(*i);
for (Paths::iterator j = preds.begin();
j != preds.end(); j++)
cout << format("%s\n") % *j;
}
break;
}
case qGraph: {
PathSet roots;
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); i++)
roots.insert(maybeNormalise(*i, normalise, realise));
printDotGraph(roots);
break;
}
default:
abort();
}
}
static void opSuccessor(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
if (opArgs.size() % 2) throw UsageError("expecting even number of arguments");
Transaction txn;
createStoreTransaction(txn);
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); )
{
Path path1 = *i++;
Path path2 = *i++;
registerSuccessor(txn, path1, path2);
}
txn.commit();
}
static void opSubstitute(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
if (!opArgs.empty())
throw UsageError("no arguments expected");
Transaction txn;
createStoreTransaction(txn);
while (1) {
Path srcPath;
Substitute sub;
getline(cin, srcPath);
if (cin.eof()) break;
getline(cin, sub.storeExpr);
getline(cin, sub.program);
string s;
getline(cin, s);
istringstream st(s);
int n;
st >> n;
if (!st) throw Error("number expected");
while (n--) {
getline(cin, s);
sub.args.push_back(s);
}
if (!cin || cin.eof()) throw Error("missing input");
registerSubstitute(txn, srcPath, sub);
}
txn.commit();
}
static void opValidPath(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
Transaction txn;
createStoreTransaction(txn);
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); ++i)
registerValidPath(txn, *i);
txn.commit();
}
static void opIsValid(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); ++i)
if (!isValidPath(*i))
throw Error(format("path `%1%' is not valid") % *i);
}
static void opGC(Strings opFlags, Strings opArgs)
{
if (opFlags.size() != 1) throw UsageError("missing flag");
if (!opArgs.empty())
throw UsageError("no arguments expected");
/* Do what? */
string flag = opFlags.front();
enum { soPrintLive, soPrintDead, soDelete } subOp;
if (flag == "--print-live") subOp = soPrintLive;
else if (flag == "--print-dead") subOp = soPrintDead;
else if (flag == "--delete") subOp = soDelete;
else throw UsageError(format("bad sub-operation `%1% in GC") % flag);
Paths roots;
while (1) {
Path root;
getline(cin, root);
if (cin.eof()) break;
roots.push_back(root);
}
PathSet live = findLivePaths(roots);
if (subOp == soPrintLive) {
for (PathSet::iterator i = live.begin(); i != live.end(); ++i)
cout << *i << endl;
return;
}
PathSet dead = findDeadPaths(live);
if (subOp == soPrintDead) {
for (PathSet::iterator i = dead.begin(); i != dead.end(); ++i)
cout << *i << endl;
return;
}
if (subOp == soDelete) {
/* !!! What happens if the garbage collector run is aborted
halfway through? In particular, dead paths can always
become live again (through re-instantiation), and might
then refer to deleted paths. => check instantiation
invariants */
for (PathSet::iterator i = dead.begin(); i != dead.end(); ++i) {
printMsg(lvlInfo, format("deleting `%1%'") % *i);
deleteFromStore(*i);
}
}
}
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/* A sink that writes dump output to stdout. */
struct StdoutSink : DumpSink
{
virtual void operator ()
(const unsigned char * data, unsigned int len)
{
writeFull(STDOUT_FILENO, data, len);
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}
};
/* Dump a path as a Nix archive. The archive is written to standard
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output. */
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static void opDump(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
if (opArgs.size() != 1) throw UsageError("only one argument allowed");
StdoutSink sink;
string path = *opArgs.begin();
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dumpPath(path, sink);
}
/* A source that read restore intput to stdin. */
struct StdinSource : RestoreSource
{
virtual void operator () (unsigned char * data, unsigned int len)
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{
readFull(STDIN_FILENO, data, len);
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}
};
/* Restore a value from a Nix archive. The archive is written to
standard input. */
static void opRestore(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
if (opArgs.size() != 1) throw UsageError("only one argument allowed");
StdinSource source;
restorePath(*opArgs.begin(), source);
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}
/* Initialise the Nix databases. */
static void opInit(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
if (!opArgs.empty())
throw UsageError("no arguments expected");
initDB();
}
/* Verify the consistency of the Nix environment. */
static void opVerify(Strings opFlags, Strings opArgs)
{
verifyStore();
}
/* Scan the arguments; find the operation, set global flags, put all
other flags in a list, and put all other arguments in another
list. */
void run(Strings args)
{
Strings opFlags, opArgs;
Operation op = 0;
for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
string arg = *i;
Operation oldOp = op;
if (arg == "--realise" || arg == "-r")
op = opRealise;
else if (arg == "--add" || arg == "-A")
op = opAdd;
else if (arg == "--query" || arg == "-q")
op = opQuery;
else if (arg == "--successor")
op = opSuccessor;
else if (arg == "--substitute")
op = opSubstitute;
else if (arg == "--validpath")
op = opValidPath;
else if (arg == "--isvalid")
op = opIsValid;
else if (arg == "--gc")
op = opGC;
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else if (arg == "--dump")
op = opDump;
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else if (arg == "--restore")
op = opRestore;
else if (arg == "--init")
op = opInit;
else if (arg == "--verify")
op = opVerify;
else if (arg[0] == '-')
opFlags.push_back(arg);
else
opArgs.push_back(arg);
if (oldOp && oldOp != op)
throw UsageError("only one operation may be specified");
}
if (!op) throw UsageError("no operation specified");
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if (op != opDump && op != opRestore) /* !!! hack */
openDB();
op(opFlags, opArgs);
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}
string programId = "nix-store";