forked from lix-project/lix
316 lines
8 KiB
C++
316 lines
8 KiB
C++
#include <iostream>
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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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typedef void (* Operation) (Strings opFlags, Strings opArgs);
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static bool pathArgs = false;
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/* Nix syntax:
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nix [OPTIONS...] [ARGUMENTS...]
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Operations:
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--install / -i: realise an fstate
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--delete / -d: delete paths from the Nix store
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--add / -A: copy a path to the Nix store
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--query / -q: query information
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--successor: register a successor expression
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--substitute: register a substitute expression
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--dump: dump a path as a Nix archive
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--restore: restore a path from a Nix archive
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--init: initialise the Nix database
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--verify: verify Nix structures
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--version: output version information
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--help: display help
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Source selection for --install, --dump:
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--path / -p: by file name !!! -> path
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Query flags:
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--list / -l: query the output paths (roots) of an fstate
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--refs / -r: query paths referenced by an fstate
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Options:
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--verbose / -v: verbose operation
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*/
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static FSId argToId(const string & arg)
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{
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if (!pathArgs)
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return parseHash(arg);
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else {
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FSId id;
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if (!queryPathId(arg, id))
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throw Error(format("don't know id of `%1%'") % arg);
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return id;
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}
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}
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/* Realise (or install) paths from the given Nix fstate
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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 it = opArgs.begin();
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it != opArgs.end(); it++)
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realiseSlice(normaliseFState(argToId(*it)));
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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(absPath(*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 it = opArgs.begin();
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it != opArgs.end(); it++)
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{
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string path;
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FSId id;
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addToStore(*it, path, id);
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cout << format("%1% %2%\n") % (string) id % path;
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}
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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 { qPaths, qRefs, qGenerators, qUnknown } query = qPaths;
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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 = qPaths;
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else if (*i == "--refs" || *i == "-r") query = qRefs;
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else if (*i == "--generators" || *i == "-g") query = qGenerators;
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else throw UsageError(format("unknown flag `%1%'") % *i);
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switch (query) {
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case qPaths: {
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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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Strings paths2 = fstatePaths(argToId(*i), true);
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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 qRefs: {
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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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Strings paths2 = fstateRefs(argToId(*i));
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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 qGenerators: {
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FSIds outIds;
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); i++)
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outIds.push_back(argToId(*i));
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FSIds genIds = findGenerators(outIds);
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for (FSIds::iterator i = genIds.begin();
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i != genIds.end(); i++)
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cout << format("%s\n") % expandId(*i);
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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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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); )
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{
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FSId id1 = parseHash(*i++);
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FSId id2 = parseHash(*i++);
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registerSuccessor(id1, id2);
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}
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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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FSId src = parseHash(*i++);
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FSId sub = parseHash(*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 arg = *opArgs.begin();
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string path = pathArgs ? arg : expandId(parseHash(arg));
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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();
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it != args.end(); it++)
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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 == "--path" || arg == "-p")
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pathArgs = true;
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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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op(opFlags, opArgs);
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}
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string programId = "nix";
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