source/copy.cpp

   1 #include <errno.h>
   2 #include <sys/stat.h>
   3 #include <msp/fs/dir.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 "builder.h"
   9 #include "copy.h"
  10 #include "install.h"
  11
  12 using namespace std;
  13 using namespace Msp;
  14
  15 Copy::Copy(Builder &b):
  16         Tool(b, "CP")
  17 { }
  18
  19 Target *Copy::create_target(const list<Target *> &sources, const string &arg) const
  20 {
  21         FileTarget &file_tgt = dynamic_cast<FileTarget &>(*sources.front());
  22         const SourcePackage &pkg = dynamic_cast<const SourcePackage &>(*file_tgt.get_package());
  23         Install *inst = new Install(builder, pkg, file_tgt, arg);
  24         inst->set_tool(*this);
  25         return inst;
  26 }
  27
  28 Task *Copy::run(const Target &target) const
  29 {
  30         const Install &install = dynamic_cast<const Install &>(target);
  31         Worker *worker = new Worker(install);
  32         return new InternalTask(worker);
  33 }
  34
  35
  36 Copy::Worker::Worker(const Install &t):
  37         target(t)
  38 {
  39         launch();
  40 }
  41
  42 void Copy::Worker::main()
  43 {
  44         const FileTarget &source = target.get_source();
  45         const FS::Path &src_path = source.get_path();
  46         const FS::Path &dst_path = target.get_path();
  47         FS::mkpath(FS::dirname(dst_path), 0755);
  48
  49         // Remove old file.  Not doing this would cause Bad Stuff when installing libraries.
  50         if(FS::exists(dst_path))
  51         {
  52                 try
  53                 {
  54                         unlink(dst_path);
  55                 }
  56                 catch(const exception &e)
  57                 {
  58                         IO::print(IO::cerr, "%s\n", e.what());
  59                         status = Task::ERROR;
  60                         return;
  61                 }
  62         }
  63
  64         try
  65         {
  66                 IO::File in(src_path.str());
  67                 IO::File out(dst_path.str(), IO::M_WRITE);
  68
  69                 // Actual transfer loop
  70                 char buf[16384];
  71                 while(!in.eof())
  72                 {
  73                         unsigned len = in.read(buf, sizeof(buf));
  74                         out.write(buf, len);
  75                 }
  76         }
  77         catch(const exception &e)
  78         {
  79                 IO::print(IO::cerr, "%s\n", e.what());
  80                 status = Task::ERROR;
  81                 return;
  82         }
  83
  84         // Preserve file permissions
  85         struct stat st;
  86         if(stat(src_path.str().c_str(), &st)==0)
  87                 chmod(dst_path.str().c_str(), st.st_mode&0777);
  88
  89         const FS::Path &link = target.get_symlink();
  90         if(!link.empty())
  91         {
  92                 FS::Path relpath = FS::relative(dst_path, FS::dirname(link));
  93                 symlink(relpath.str().c_str(), link.str().c_str());
  94         }
  95
  96         status = Task::SUCCESS;
  97 }