plugins/base/tar.cpp

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