forked from lix-project/lix
305 lines
8.1 KiB
C++
305 lines
8.1 KiB
C++
#include <iostream>
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#include <sstream>
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#include "globals.hh"
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#include "normalise.hh"
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#include "archive.hh"
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#include "shared.hh"
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#include "dotgraph.hh"
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typedef void (* Operation) (Strings opFlags, Strings opArgs);
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static void printHelp()
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{
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cout <<
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#include "nix-help.txt.hh"
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;
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exit(0);
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}
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static Path checkPath(const Path & arg)
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{
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return arg; /* !!! check that arg is in the store */
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}
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/* Realise (or install) paths from the given Nix expressions. */
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static void opInstall(Strings opFlags, Strings opArgs)
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{
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if (!opFlags.empty()) throw UsageError("unknown flag");
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); i++)
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{
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Path nfPath = normaliseNixExpr(checkPath(*i));
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realiseClosure(nfPath);
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cout << format("%1%\n") % (string) nfPath;
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}
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}
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/* Delete a path in the Nix store directory. */
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static void opDelete(Strings opFlags, Strings opArgs)
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{
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if (!opFlags.empty()) throw UsageError("unknown flag");
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for (Strings::iterator it = opArgs.begin();
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it != opArgs.end(); it++)
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deleteFromStore(checkPath(*it));
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}
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/* Add paths to the Nix values directory and print the hashes of those
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paths. */
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static void opAdd(Strings opFlags, Strings opArgs)
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{
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if (!opFlags.empty()) throw UsageError("unknown flag");
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for (Strings::iterator i = opArgs.begin(); i != opArgs.end(); i++)
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cout << format("%1%\n") % addToStore(*i);
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}
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Path maybeNormalise(const Path & ne, bool normalise)
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{
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return normalise ? normaliseNixExpr(ne) : ne;
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}
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/* Perform various sorts of queries. */
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static void opQuery(Strings opFlags, Strings opArgs)
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{
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enum { qList, qRequisites, qPredecessors, qGraph
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} query = qList;
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bool normalise = false;
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bool includeExprs = true;
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bool includeSuccessors = false;
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for (Strings::iterator i = opFlags.begin();
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i != opFlags.end(); i++)
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if (*i == "--list" || *i == "-l") query = qList;
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else if (*i == "--requisites" || *i == "-r") query = qRequisites;
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else if (*i == "--predecessors") query = qPredecessors;
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else if (*i == "--graph") query = qGraph;
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else if (*i == "--normalise" || *i == "-n") normalise = true;
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else if (*i == "--exclude-exprs") includeExprs = false;
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else if (*i == "--include-successors") includeSuccessors = true;
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else throw UsageError(format("unknown flag `%1%'") % *i);
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switch (query) {
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case qList: {
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); i++)
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{
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StringSet paths = nixExprRoots(
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maybeNormalise(checkPath(*i), normalise));
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for (StringSet::iterator j = paths.begin();
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j != paths.end(); j++)
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cout << format("%s\n") % *j;
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}
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break;
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}
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case qRequisites: {
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StringSet paths;
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); i++)
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{
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StringSet paths2 = nixExprRequisites(
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maybeNormalise(checkPath(*i), normalise),
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includeExprs, includeSuccessors);
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paths.insert(paths2.begin(), paths2.end());
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}
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for (StringSet::iterator i = paths.begin();
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i != paths.end(); i++)
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cout << format("%s\n") % *i;
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break;
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}
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case qPredecessors: {
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); i++)
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{
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Paths preds = queryPredecessors(checkPath(*i));
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for (Paths::iterator j = preds.begin();
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j != preds.end(); j++)
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cout << format("%s\n") % *j;
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}
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break;
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}
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case qGraph: {
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PathSet roots;
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); i++)
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roots.insert(maybeNormalise(checkPath(*i), normalise));
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printDotGraph(roots);
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break;
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}
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default:
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abort();
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}
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}
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static void opSuccessor(Strings opFlags, Strings opArgs)
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{
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if (!opFlags.empty()) throw UsageError("unknown flag");
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if (opArgs.size() % 2) throw UsageError("expecting even number of arguments");
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Transaction txn;
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createStoreTransaction(txn);
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); )
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{
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Path path1 = checkPath(*i++);
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Path path2 = checkPath(*i++);
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registerSuccessor(txn, path1, path2);
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}
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txn.commit();
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}
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static void opSubstitute(Strings opFlags, Strings opArgs)
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{
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if (!opFlags.empty()) throw UsageError("unknown flag");
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if (opArgs.size() % 2) throw UsageError("expecting even number of arguments");
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); )
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{
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Path src = checkPath(*i++);
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Path sub = checkPath(*i++);
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registerSubstitute(src, sub);
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}
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}
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/* A sink that writes dump output to stdout. */
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struct StdoutSink : DumpSink
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{
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virtual void operator ()
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(const unsigned char * data, unsigned int len)
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{
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writeFull(STDOUT_FILENO, data, len);
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}
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};
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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)
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{
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if (!opFlags.empty()) throw UsageError("unknown flag");
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if (opArgs.size() != 1) throw UsageError("only one argument allowed");
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StdoutSink sink;
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string path = *opArgs.begin();
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dumpPath(path, sink);
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}
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/* A source that read restore intput to stdin. */
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struct StdinSource : RestoreSource
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{
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virtual void operator () (unsigned char * data, unsigned int len)
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{
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readFull(STDIN_FILENO, data, len);
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}
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};
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/* Restore a value from a Nix archive. The archive is written to
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standard input. */
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static void opRestore(Strings opFlags, Strings opArgs)
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{
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if (!opFlags.empty()) throw UsageError("unknown flag");
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if (opArgs.size() != 1) throw UsageError("only one argument allowed");
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StdinSource source;
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restorePath(*opArgs.begin(), source);
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}
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/* Initialise the Nix databases. */
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static void opInit(Strings opFlags, Strings opArgs)
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{
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if (!opFlags.empty()) throw UsageError("unknown flag");
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if (!opArgs.empty())
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throw UsageError("--init does not have arguments");
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initDB();
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}
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/* Verify the consistency of the Nix environment. */
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static void opVerify(Strings opFlags, Strings opArgs)
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{
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verifyStore();
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}
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/* Scan the arguments; find the operation, set global flags, put all
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other flags in a list, and put all other arguments in another
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list. */
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void run(Strings args)
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{
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Strings opFlags, opArgs;
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Operation op = 0;
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for (Strings::iterator it = args.begin(); it != args.end(); )
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{
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string arg = *it++;
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Operation oldOp = op;
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if (arg == "--install" || arg == "-i")
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op = opInstall;
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else if (arg == "--delete" || arg == "-d")
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op = opDelete;
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else if (arg == "--add" || arg == "-A")
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op = opAdd;
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else if (arg == "--query" || arg == "-q")
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op = opQuery;
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else if (arg == "--successor")
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op = opSuccessor;
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else if (arg == "--substitute")
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op = opSubstitute;
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else if (arg == "--dump")
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op = opDump;
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else if (arg == "--restore")
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op = opRestore;
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else if (arg == "--init")
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op = opInit;
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else if (arg == "--verify")
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op = opVerify;
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else if (arg == "--verbose" || arg == "-v")
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verbosity = (Verbosity) ((int) verbosity + 1);
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else if (arg == "--keep-failed" || arg == "-K")
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keepFailed = true;
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else if (arg == "--help")
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printHelp();
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else if (arg[0] == '-')
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opFlags.push_back(arg);
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else
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opArgs.push_back(arg);
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if (oldOp && oldOp != op)
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throw UsageError("only one operation may be specified");
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}
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if (!op) throw UsageError("no operation specified");
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openDB();
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op(opFlags, opArgs);
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}
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string programId = "nix";
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