source: main/trunk/release-kits/shared/linux/wrapper.cpp

#include <iostream>
#include <fstream>
#include <iomanip>
#include <string.h>
#include <cstdlib>
#include <sstream>
using namespace std;

// The following provides the externs for chdir() and getcwd()
#include <unistd.h>
//extern int chdir(const char *path);
//extern char *getcwd(char *buf, size_t size);

#ifndef CDROM
#include "wrapper.h"
#include "libsearch4j.h"
bool extract_bundled_file( const char[], int, const char*, bool );
#else
bool prep_java( string wd );
#endif

void usage( char* progname, int exitvalue = -1 ) {
    cerr
        << "Usage: " << progname << " [OPTIONS]" << endl
        << "OPTIONS: " << endl
        << " -h, -help   Display this usage message" << endl
        << " -textonly   Do a non-graphical command line installation" << endl
        << " -extract    Extract the jar file, this can " << endl;
    #ifdef CDROM
    cerr << " -wd PATH          Look for the CD-ROM at PATH" << endl;
    #endif

    exit( exitvalue );
}

int main(int argc, char** argv) {

    char wdc[1024];
    getcwd(wdc, sizeof(wdc));
    string wd = "";
    wd.append( wdc );
    
    string scratch = (getenv("TMPDIR") == NULL) ? "/tmp" : getenv("TMPDIR");
    string tempdir = scratch + "/greenstone-installer.tmp"; //temporary directory where we will store extracted files
    bool succeeded = false;
    bool text_mode = false;

    //parse arguments
    string a;
    for ( int i=1; i<argc; i++ ) {
        a = argv[i];
        if ( a.compare("-wd") == 0 ) {
            wd = "";
            wd.append( argv[++i] );
        } else if ( a.compare("-h") == 0 || a.compare("-help") == 0 || a.compare("--help") == 0) {
            usage( argv[0], 0 );
        } else if ( a.compare("-textonly") == 0 || a.compare("-text") == 0 || a.compare("text") == 0 ) {
            //cerr << "-text is deprecated, please use -extract and then run \"java -jar greenstone.jar text\"" << endl;
            text_mode = true;
#ifndef CDROM
        } else if ( a.compare("-extract") == 0 || a.compare("--extract") || a.compare("-x")) {
            cout << "----------------------------" << endl;
            cout << "Extracting java installer..." << endl;
            cout << "----------------------------" << endl;
            bool result = extract_bundled_file( greenstonejar, sizeof(greenstonejar), "greenstone.jar", false);
            if(result){
                cout << "\nExtraction Complete" << endl;
                cout << "You can now run \"java -jar greenstone.jar text\" to run the installer from the command line\n" << endl;
                return 0;
            }
            else{
                cerr << "\nThere was an error while extracting the java installer" << endl;
                return 1;
            }
#endif
        } else {
            cerr << "Unrecognised option '" << a << "'" << endl;
            usage(argv[0]);
        }
    }

    #ifdef CDROM
    //ensure working directory is correct
    FILE* pFile;
    pFile = fopen( (wd+"/Software/core/all/uninst.jar").c_str(), "r");
    if ( pFile == NULL ) {
        cerr << "Could not find cdrom at '" << wd << "'." << endl;
        cerr << "Please enter the path the CDROM [/media/cdrom]: ";
        getline(cin, wd);
        if ( wd.compare("") == 0 ) {
            wd = "/media/cdrom";
        }
    } else {
        fclose(pFile);
    }

    pFile = fopen( (wd+"/Software/core/all/uninst.jar").c_str(), "r");
    if ( pFile == NULL ) {
        cerr << "Could not find cdrom at '"<< wd << "'." << endl;
        cerr << "Please run the installer again" << endl;
        exit(-1);
    } else {
        fclose(pFile);
    }
    #endif

    //create the temp folder
    cout << "Creating temp directory..." << endl;
    succeeded = ( 0 == system( ("mkdir " + tempdir).c_str() ) );
    if ( !succeeded ) {
        cerr << "Failed to create the temp directory '" << tempdir << "'. " <<
         "Check that it does not already exist. Also check that you have write " <<
         "permissions to '" << scratch << "', or set the environment variable TMPDIR to " <<
         "a directory where you do have write permissions." << endl <<
        "Exiting" << endl;
        return 1;
    }
    
    #ifndef CDROM

    string jarfile = tempdir + "/greenstone.jar"; //where we will store the jar file
    string javafile = tempdir + "/@java.installer@"; //where we will store the java tar file


    //extract files
    cout << "Extracting installer jar..." << endl;
    succeeded = extract_bundled_file( greenstonejar, sizeof(greenstonejar), jarfile.c_str(), false);

    #ifdef java_is_bundled
    cout << "Preparing Greenstone installer..." << endl;
    succeeded = extract_bundled_file( java, sizeof(java), javafile.c_str(), true ) && succeeded;
    #endif
        
    if ( !succeeded ) {
        cerr << "Failed to extract one or more resources" << endl;
        cerr << "This installer may not have sufficient file permissions to write it to disk" << endl;
        cerr << "Or, the files may be corrupt or missing from this executable" << endl;
        cerr << "Exiting" << endl;
        return 1;
    }

    #endif

    //change to the temp directory
    chdir( tempdir.c_str() );


    #ifndef CDROM
    #ifdef java_is_bundled
    succeeded = (system( "/bin/sh -c ./@java.installer@ > /dev/null" ) == 0);
    succeeded = succeeded && ( system( "tar -xf jre.tar" ) == 0 );
    if ( !succeeded ) {
        cout << "Failed to extract the bundled java archive to the temp directory" << endl;
        cout << "You need the tar program on your PATH" << endl;
        cout << "Exiting" << endl;
        return 1;
    }
    #endif

    //check if an appropriate java is found
    Jvm minimum; minimum.setVersionFromString( "@java.min.version@" );
    string phint = "./@java.extracted@";
    string hint = "";
    Jvm foundJvm;
    bool jvmFound = find( foundJvm, true, minimum, false, false, phint, hint, false );

    //if the jvm was not found, report not found
    if ( !jvmFound ) {

        //did not find a good java
        cout << "Greenstone requires java @java.min.version@ or greater." << endl;
        
        //tell them if java is absent or just too old
        Jvm tmpJvm;
        if ( find( tmpJvm, false, minimum, false, false, phint, hint, false ) ) {
            cout << "You have java, but it is too old." << endl;
        } else {
            cout << "Could not find java on your system." << endl;
        }
        
        cout << "Install java (@java.min.version@ or greater) and set JAVA_HOME or JRE_HOME, and try again" << endl;
        #ifndef java_is_bundled
        cout << "Or, download a greentsone3 installer with bundled java and use that instead of this one" << endl;
        #endif

    //if we have found it, launch the installer
    } else {

        cout << "Launching Installer ..." << endl;
        int launch_exit_code = 0;
        launch_exit_code = system( (foundJvm.getExecutable() + " -Xmx200M -jar greenstone.jar" + (text_mode?" text":"") ).c_str() );

        //report how it went
        if ( launch_exit_code == 0 ) {
            cout << "Setup complete" << endl;
        } else {
            cout << "The installer exited with an error" << endl;
            cout << "Greenstone may not be correctly installed" << endl;
        }

    }
    #else
        bool java_ready = prep_java( wd );
        if ( java_ready ) {
            string cmd = "./jre/bin/java -Dorig.dir=\"" + wd + "\" -jar " + wd + "/Java/Jars/linux.jar" + (text_mode?" text":"");
            system( cmd.c_str() );
        }
    #endif

    //change to the scratch dir for the following operation
    chdir(scratch.c_str());

    //delete the temp files
    cout << "Deleting the temp directory" << endl;
    system( ("rm -rf " + tempdir).c_str() );

    return 0;

}
#ifndef CDROM
bool extract_bundled_file( const char data[], int size, const char* filename, bool make_executable) {

    if ( size == 0 ) return false;

    //delete the file if it exists
    remove( filename );

    //open the file
    fstream binary_file( filename, ios::out|ios::binary );
    if ( !binary_file.good() ) {
        binary_file.close();
        return false;
    }

    //write the file
    binary_file.write( data, size );
    if ( !binary_file.good() ) {
        binary_file.close();
        return false;
    }

    //close the file
    binary_file.close();
    if ( !binary_file.good() ) {
        binary_file.close();
        return false;
    }

    if ( make_executable ) {
        string command = "chmod a+x " + string(filename);
        system( command.c_str() );
    }

    return true;

}
#else

bool prep_java( string wd ) {


  string jTestCmd = "./jre/bin/java -version >/dev/null 2>&1";

  //try to extract straight off cd
  string j1cmd = wd + "/Java/Linux/jre_bin && tar -xf jre.tar && " + jTestCmd;
  int j1status = system(j1cmd.c_str());
  system("/bin/rm -f jre.tar");
  
  if (WEXITSTATUS(j1status)!=0) {
    cerr << "Unable to extract java straight off CD-ROM." << endl;
    cerr << "This is probably because your CD-ROM was mounted with 'noexec'." << endl;
    cerr << "It can be changed by a system administrator" << endl << endl;
    cerr << "Copying Java to local disk so it can be run" << endl;
    
    string cdtar_home = wd + "/Java/Linux/";
    string tcmd = "(cd \"" + cdtar_home + "\" ; tar cf - jre_bin )";
    tcmd += "| tar xvf - ";
    //tcmd += "| awk 'BEGIN{C=0}{C++; printf(\".\"); if (C%70==0) printf(\"\\n\");}END{printf(\"\\n\")}'";

    int tstatus = system(tcmd.c_str());
    
    if (WEXITSTATUS(tstatus)!=0) {
      cerr << "Failed to copy Java to disk" << endl;
      cerr << "Please make sure you have write permissions in the directory where you run the installer" << endl;
    }
    else {

      string j2cmd = "./jre_bin && tar -xf jre.tar && " + jTestCmd;
      int j2status = system(j2cmd.c_str());
      system("/bin/rm -f jre.tar jre_bin");

      if (WEXITSTATUS(j2status)!=0) {
        cerr << "Unable to run copied Java" << endl;
        return false;
      }
    }
  }

  // to get to here, full_java must be set (and working)

  return true;
}

#endif