55 lines
1.2 KiB
C++
55 lines
1.2 KiB
C++
#include "base/output_file_requirements.h"
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#include <iostream>
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#include <linux/fs.h>
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#include <sstream>
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#include <stdexcept>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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using namespace base;
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using namespace std;
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//----------------------------------------------------------------
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namespace {
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void explain_output_file_requirements() {
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ostringstream out;
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out << "The output file should either be a block device,\n"
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<< "or an existing file. The file needs to be large\n"
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<< "enough to hold the metadata.";
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throw runtime_error(out.str());
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}
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unsigned const MIN_SIZE = 32 * 1024;
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}
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void
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base::check_output_file_requirements(string const &path)
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{
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struct stat info;
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int r = ::stat(path.c_str(), &info);
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if (r) {
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cerr << "Output file does not exist.\n\n";
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explain_output_file_requirements();
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}
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// We only really want these checks for regular files
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if (S_ISREG(info.st_mode)) {
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if (!info.st_size) {
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cerr << "Zero size output file.\n\n";
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explain_output_file_requirements();
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}
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if (info.st_size < MIN_SIZE) {
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cerr << "Output file too small.\n\n";
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explain_output_file_requirements();
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}
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}
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}
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//----------------------------------------------------------------
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