diff options
author | Eelco Dolstra <e.dolstra@tudelft.nl> | 2003-06-18T14·34+0000 |
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committer | Eelco Dolstra <e.dolstra@tudelft.nl> | 2003-06-18T14·34+0000 |
commit | 38e12df631cc45fda97942070d7ebea1bb9c7f2f (patch) | |
tree | 4f1fc069c2728838efce3eaf7c23cadaaeac3f39 /src/nix.cc | |
parent | aeaffec7857301a6d20d7901041918484666d567 (diff) |
* `nix --dump' command.
Diffstat (limited to 'src/nix.cc')
-rw-r--r-- | src/nix.cc | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/src/nix.cc b/src/nix.cc index fae3175ba4dc..b2bb3bb1aba6 100644 --- a/src/nix.cc +++ b/src/nix.cc @@ -62,6 +62,29 @@ static void opAdd(Strings opFlags, Strings opArgs) } +/* A sink that writes dump output to stdout. */ +struct StdoutSink : DumpSink +{ + virtual void operator () + (const unsigned char * data, unsigned int len) + { + /* Don't use cout, it's slow as hell! */ + write(STDOUT_FILENO, (char *) data, len); + } +}; + + +/* Dump a value to standard output */ +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; + dumpPath(opArgs[0], sink); +} + + /* Initialise the Nix databases. */ static void opInit(Strings opFlags, Strings opArgs) { @@ -83,7 +106,7 @@ static void opInit(Strings opFlags, Strings opArgs) --query / -q: query stored values --add: add values --verify: verify Nix structures - --dump: dump a value + --dump: dump a file or value --init: initialise the Nix database --version: output version information --help: display help @@ -134,6 +157,8 @@ void run(Strings::iterator argCur, Strings::iterator argEnd) op = opDelete; else if (arg == "--add") op = opAdd; + else if (arg == "--dump") + op = opDump; else if (arg == "--init") op = opInit; else if (arg[0] == '-') @@ -158,11 +183,9 @@ int main(int argc, char * * argv) ATinit(argc, argv, &bottomOfStack); try { - Strings args; while (argc--) args.push_back(*argv++); run(args.begin() + 1, args.end()); - } catch (UsageError & e) { cerr << "error: " << e.what() << endl << "Try `nix --help' for more information.\n"; |