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// file : bpkg/archive.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <bpkg/archive.hxx>
#include <libbutl/process.mxx>
#include <bpkg/utility.hxx>
#include <bpkg/diagnostics.hxx>
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 (d.extension () == "tar")
d = d.base ();
return path_cast<dir_path> (d);
}
pair<process, process>
start_extract (const common_options& co,
const path& a,
const path& f,
bool diag)
{
assert (!f.empty () && f.relative ());
cstrings args;
// See if we need to decompress.
//
{
string e (a.extension ());
if (e == "gz") args.push_back ("gzip");
else if (e == "bzip2") args.push_back ("bzip2");
else if (e == "xz") args.push_back ("xz");
else if (e != "tar")
fail << "unknown compression method in " << a;
}
size_t i (0); // The tar command line start.
if (!args.empty ())
{
args.push_back ("-dc");
args.push_back (a.string ().c_str ());
args.push_back (nullptr);
i = args.size ();
}
args.push_back (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. Note that BSD tar doesn't
// support this option.
//
#ifdef _WIN32
args.push_back ("--force-local");
#endif
args.push_back ("-xf");
args.push_back (i == 0 ? 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);
args.push_back (nullptr); // Pipe end.
size_t what;
try
{
process_path dpp;
process_path tpp;
process dpr;
process tpr;
if (i != 0)
dpp = process::path_search (args[what = 0]);
tpp = process::path_search (args[what = i]);
if (verb >= 2)
print_process (args);
// If diag is false, then redirect stderr to stdout.
//
auto_fd nfd (diag ? nullfd : fdnull ());
if (i != 0)
{
dpr = process (dpp, &args[what = 0], 0, -1, (diag ? 2 : nfd.get ()));
tpr = process (tpp, &args[what = i], dpr, -1, (diag ? 2 : nfd.get ()));
}
else
tpr = process (tpp, &args[what = 0], 0, -1, (diag ? 2 : nfd.get ()));
return make_pair (move (dpr), move (tpr));
}
catch (const process_error& e)
{
error << "unable to execute " << args[what] << ": " << e;
if (e.child)
exit (1);
throw failed ();
}
}
string
extract (const common_options& o, const path& a, const path& f, bool diag)
try
{
pair<process, process> pr (start_extract (o, a, f, diag));
try
{
// Do not throw when eofbit is set (end of stream reached), and
// when failbit is set (getline() failed to extract any character).
//
ifdstream is (move (pr.second.in_ofd), ifdstream::badbit);
string s (is.read_text ());
is.close ();
if (pr.second.wait () && pr.first.wait ())
return s;
// Fall through.
}
catch (const io_error&)
{
// Child exit status doesn't matter. Just wait for the process
// completion and fall through.
//
pr.second.wait (); pr.first.wait (); // Check throw.
}
// 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, if the diagnostics is requested.
//
if (diag)
error << "unable to extract " << f << " from " << a;
throw failed ();
}
catch (const process_error& e)
{
// Note: this is not a "file can't be extracted" case, so no diag check.
//
fail << "unable to extract " << f << " from " << a << ": " << e << endf;
}
}
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