* Converted to C++.

src/nix.cc

@@ -0,0 +1,220 @@
+#include <iostream>
+#include <memory>
+#include <string>
+
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <db4/db_cxx.h>
+
+using namespace std;
+
+
+#define PKGINFO_PATH "/pkg/sys/var/pkginfo"
+
+
+static string prog;
+static string dbfile = PKGINFO_PATH;
+
+
+class Db2 : public Db 
+{
+public:
+    Db2(DbEnv *env, u_int32_t flags)
+        : Db(env, flags)
+    {
+    }
+
+    ~Db2()
+    {
+        close(0);
+    }
+};
+
+
+auto_ptr<Db2> openDB(const string & dbname, bool readonly)
+{
+    auto_ptr<Db2> db;
+
+    db = auto_ptr<Db2>(new Db2(0, 0));
+
+    db->open(dbfile.c_str(), dbname.c_str(),
+        DB_HASH, readonly ? DB_RDONLY : DB_CREATE, 0666);
+
+    return db;
+}
+
+
+bool queryDB(const string & dbname, const string & key, string & data)
+{
+    int err;
+    auto_ptr<Db2> db = openDB(dbname, true);
+
+    Dbt kt((void *) key.c_str(), key.length());
+    Dbt dt;
+
+    err = db->get(0, &kt, &dt, 0);
+    if (err) return false;
+
+    data = string((char *) dt.get_data(), dt.get_size());
+    
+    return true;
+}
+
+
+void setDB(const string & dbname, const string & key, const string & data)
+{
+    auto_ptr<Db2> db = openDB(dbname, false);
+    Dbt kt((void *) key.c_str(), key.length());
+    Dbt dt((void *) data.c_str(), data.length());
+    db->put(0, &kt, &dt, 0);
+}
+
+
+void delDB(const string & dbname, const string & key)
+{
+    auto_ptr<Db2> db = openDB(dbname, false);
+    Dbt kt((void *) key.c_str(), key.length());
+    db->del(0, &kt, 0);
+}
+
+
+void getPkg(int argc, char * * argv)
+{
+    string pkg;
+    string src;
+    string inst;
+    string cmd;
+    int res;
+
+    if (argc != 1)
+        throw string("arguments missing in get-pkg");
+
+    pkg = argv[0];
+
+    if (queryDB("pkginst", pkg, inst)) {
+        cout << inst << endl;
+        return;
+    }
+    
+    cerr << "package " << pkg << " is not yet installed\n";
+        
+    if (!queryDB("pkgsrc", pkg, src)) 
+        throw string("source of package " + string(pkg) + " is not known");
+
+    inst = "/pkg/" + pkg;
+
+    cmd = "rsync -a \"" + src + "\"/ \"" + inst + "\"";
+        
+    res = system(cmd.c_str());
+    if (!WIFEXITED(res) || WEXITSTATUS(res) != 0)
+        throw string("unable to copy sources");
+
+    if (chdir(inst.c_str()))
+        throw string("unable to chdir to package directory");
+
+    /* Prepare for building.  Clean the environment so that the
+       build process does not inherit things it shouldn't. */
+    setenv("PATH", "/pkg/sys/bin", 1);
+
+    res = system("./buildme");
+    if (!WIFEXITED(res) || WEXITSTATUS(res) != 0)
+        throw string("unable to build package");
+
+    setDB("pkginst", pkg, inst);
+
+    cout << inst << endl;
+}
+
+
+void registerPkg(int argc, char * * argv)
+{
+    char * pkg;
+    char * src;
+    
+    if (argc != 2)
+        throw string("arguments missing in register-pkg");
+
+    pkg = argv[0];
+    src = argv[1];
+
+    setDB("pkgsrc", pkg, src);
+}
+
+
+/* This is primarily used for bootstrapping. */
+void registerInstalledPkg(int argc, char * * argv)
+{
+    string pkg;
+    string inst;
+    
+    if (argc != 2)
+        throw string("arguments missing in register-installed-pkg");
+
+    pkg = argv[0];
+    inst = argv[1];
+    
+    if (inst == "")
+        delDB("pkginst", pkg);
+    else
+        setDB("pkginst", pkg, inst);
+}
+
+
+void run(int argc, char * * argv)
+{
+    string cmd;
+
+    if (argc < 1)
+        throw string("command not specified\n");
+
+    cmd = argv[0];
+    argc--, argv++;
+
+    if (cmd == "get-pkg")
+        getPkg(argc, argv);
+    else if (cmd == "register-pkg")
+        registerPkg(argc, argv);
+    else if (cmd == "register-installed-pkg")
+        registerInstalledPkg(argc, argv);
+    else
+        throw string("unknown command: " + string(cmd));
+}
+    
+    
+int main(int argc, char * * argv)
+{
+    int c;
+
+    prog = argv[0];
+
+    while ((c = getopt(argc, argv, "d:")) != EOF) {
+        
+        switch (c) {
+
+        case 'd':
+            dbfile = optarg;
+            break;
+
+        default:
+            cerr << "unknown option\n";
+            break;
+        }
+
+    }
+
+    argc -= optind, argv += optind;
+
+    try {
+        run(argc, argv);
+        return 0;
+    } catch (DbException e) {
+        cerr << "db exception: " << e.what() << endl;
+        return 1;
+    } catch (string s) {
+        cerr << s << endl;
+        return 1;
+    }
+}