source/tar.cpp

   1 #include <cstring>
   2 #include <msp/fs/stat.h>
   3 #include <msp/fs/utils.h>
   4 #include <msp/io/file.h>
   5 #include <msp/io/print.h>
   6 #include "builder.h"
   7 #include "sourcepackage.h"
   8 #include "tar.h"
   9 #include "tarball.h"
  10
  11 using namespace std;
  12 using namespace Msp;
  13
  14 Tar::Tar(Builder &b):
  15         Tool(b, "TAR")
  16 {
  17         processing_unit = COMPONENT;
  18 }
  19
  20 Target *Tar::create_target(const list<Target *> &sources, const string &arg)
  21 {
  22         if(!sources.front()->get_package())
  23                 throw invalid_argument("Tar::create_target");
  24
  25         TarBall *tarball = new TarBall(builder, *sources.front()->get_package(), arg);
  26         for(Target *s: sources)
  27                 tarball->add_dependency(*s);
  28
  29         tarball->set_tool(*this);
  30
  31         return tarball;
  32 }
  33
  34 Task *Tar::run(const Target &target) const
  35 {
  36         const TarBall &tarball = dynamic_cast<const TarBall &>(target);
  37         Worker *worker = new Worker(tarball);
  38         return new InternalTask(worker);
  39 }
  40
  41
  42 Tar::Worker::Worker(const TarBall &tb):
  43         tarball(tb)
  44 { }
  45
  46 void Tar::Worker::main()
  47 {
  48         const FS::Path &pkg_src = tarball.get_package()->get_source_directory();
  49         FS::Path basedir = FS::basepart(FS::basename(tarball.get_path()));
  50
  51         IO::File out(tarball.get_path().str(), IO::M_WRITE);
  52         for(Target *d: tarball.get_dependencies())
  53         {
  54                 FileTarget *ft = dynamic_cast<FileTarget *>(d);
  55                 if(!ft)
  56                         continue;
  57
  58                 char buf[4096];
  59                 memset(buf, 0, 512);
  60
  61                 string rel_path = (basedir/relative(ft->get_path(), pkg_src)).str();
  62                 if(rel_path.size()>99)
  63                 {
  64                         IO::print("Can't store %s in tar archive - too long name\n", rel_path);
  65                         status = Task::ERROR;
  66                         return;
  67                 }
  68
  69                 memcpy(buf, rel_path.data(), rel_path.size());
  70
  71                 FS::Stat st = FS::stat(ft->get_path());
  72                 store_number(buf+100, 0666, 7);
  73                 store_number(buf+108, 0, 7);
  74                 store_number(buf+116, 0, 7);
  75                 store_number(buf+124, st.get_size(), 11);
  76                 store_number(buf+136, st.get_modify_time().to_unixtime(), 11);
  77                 buf[156] = '0';
  78
  79                 memset(buf+148, ' ', 8);
  80                 unsigned chk = 0;
  81                 for(unsigned j=0; j<512; ++j)
  82                         chk += static_cast<unsigned char>(buf[j]);
  83                 store_number(buf+148, chk, 7);
  84                 buf[155] = 0;
  85
  86                 out.write(buf, 512);
  87                 IO::File in(ft->get_path().str());
  88                 for(unsigned j=0; j<st.get_size(); j+=4096)
  89                 {
  90                         unsigned len = in.read(buf, 4096);
  91                         len += ((~len)+1)&0777;
  92                         out.write(buf, len);
  93                 }
  94         }
  95
  96         status = Task::SUCCESS;
  97 }
  98
  99 void Tar::Worker::store_number(char *buf, unsigned value, unsigned length)
 100 {
 101         for(unsigned i=length; i--;)
 102         {
 103                 buf[i] = '0'+value%8;
 104                 value /= 8;
 105         }
 106 }