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// file : bpkg/archive.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <bpkg/archive>
#include <butl/process>
#include <butl/fdstream>
#include <bpkg/diagnostics>
using namespace std;
using namespace butl;
namespace bpkg
{
dir_path
package_dir (const path& a)
{
// Strip the top-level extension and, as a special case, if the second-
// level extension is .tar, strip that as well (e.g., .tar.bz2).
//
path d (a.leaf ().base ());
if (const char* e = d.extension ())
{
if (e == string ("tar"))
d = d.base ();
}
return path_cast<dir_path> (d);
}
process
start_extract (const common_options& co,
const path& a,
const path& f,
bool err)
{
assert (!f.empty () && f.relative ());
cstrings args {co.tar ().string ().c_str ()};
// Add extra options.
//
for (const string& o: co.tar_option ())
args.push_back (o.c_str ());
// -O/--to-stdout -- extract to STDOUT.
//
args.push_back ("-O");
// An archive name that has a colon in it specifies a file or device on a
// remote machine. That makes it impossible to use absolute Windows paths
// unless we add the --force-local option.
//
args.push_back ("--force-local");
args.push_back ("-xf");
args.push_back (a.string ().c_str ());
// MSYS tar doesn't find archived file if it's path is provided in Windows
// notation.
//
string fs (f.posix_string ());
args.push_back (fs.c_str ());
args.push_back (nullptr);
if (verb >= 2)
print_process (args);
try
{
// If err is false, then redirect STDERR to STDOUT.
//
return process (args.data (), 0, -1, (err ? 2 : 1));
}
catch (const process_error& e)
{
error << "unable to execute " << args[0] << ": " << e.what ();
if (e.child ())
exit (1);
throw failed ();
}
}
string
extract (const common_options& o, const path& a, const path& f)
try
{
process pr (start_extract (o, a, f));
try
{
ifdstream is (pr.in_ofd);
// Do not throw when eofbit is set (end of stream reached), and
// when failbit is set (getline() failed to extract any character).
//
is.exceptions (ifdstream::badbit);
string s;
getline (is, s, '\0');
if (pr.wait ())
return s;
// Fall through.
}
catch (const ifdstream::failure&)
{
// Child exit status doesn't matter. Just wait for the process
// completion and fall through.
//
pr.wait ();
}
// While it is reasonable to assuming the child process issued diagnostics
// if exited with an error status, tar, specifically, doesn't mention the
// archive name. So print the error message whatever the child exit status
// is.
//
error << "unable to extract " << f << " from " << a;
throw failed ();
}
catch (const process_error& e)
{
error << "unable to extract " << f << " from " << a << ": " << e.what ();
throw failed ();
}
}
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