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