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Add a Config class to simplify adding configuration settings

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The typical use is to inherit Config and add Setting<T> members:

  class MyClass : private Config
  {
    Setting<int> foo{this, 123, "foo", "the number of foos to use"};
    Setting<std::string> bar{this, "blabla", "bar", "the name of the bar"};

    MyClass() : Config(readConfigFile("/etc/my-app.conf"))
    {
      std::cout << foo << "\n"; // will print 123 unless overriden
    }
  };

Currently, this is used by Store and its subclasses for store
parameters. You now get a warning if you specify a non-existant store
parameter in a store URI.
This commit is contained in:
Eelco Dolstra 2017-04-13 15:55:38 +02:00
parent 568a099c88
commit 2040240e23
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GPG key ID: 8170B4726D7198DE
16 changed files with 334 additions and 40 deletions
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8
src/libstore/build.cc
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@ -3051,13 +3051,11 @@ Path DerivationGoal::openLogFile()
string baseName = baseNameOf(drvPath);
/* Create a log file. */
Path dir = (format("%1%/%2%/%3%/") % worker.store.logDir % worker.store.drvsLogDir % string(baseName, 0, 2)).str();
Path dir = fmt("%s/%s/%s/", worker.store.logDir, worker.store.drvsLogDir, string(baseName, 0, 2));
createDirs(dir);
Path logFileName = (format("%1%/%2%%3%")
% dir
% string(baseName, 2)
% (settings.compressLog ? ".bz2" : "")).str();
Path logFileName = fmt("%s/%s%s", dir, string(baseName, 2),
settings.compressLog ? ".bz2" : "");
fdLogFile = open(logFileName.c_str(), O_CREAT | O_WRONLY | O_TRUNC | O_CLOEXEC, 0666);
if (!fdLogFile) throw SysError(format("creating log file ‘%1%’") % logFileName);