fs.cc

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#include <util/fs.h>
#include <gtest/gtest.h>
#include <cstring>
#include <iostream>
#include <sys/socket.h>
#include <sys/un.h>
#include <algorithm>
#include <fstream>
#include <fcntl.h>
#include <util/safe_clib.h>
#include <util/filedesc.h>
 
using std::cout;
using std::endl;
using std::string;
using std::system_error;
using std::setw;
using std::ifstream;
using fs = scc::util::Filesystem;
using scc::util::FileType;
 
struct FsTest : public testing::Test
{
    string m_curdir;
    FsTest()
    {
        system_error err;
        m_curdir = fs::get_current_dir();
        fs::remove_all("sandbox", &err);
        fs::create_dir("sandbox");
    }
    virtual ~FsTest()
    {
        fs::change_dir(m_curdir);
        system_error err;
        fs::remove_all("sandbox", &err);
    }
    void create_files()
    {
        fs::create_reg("sandbox/reg");
        fs::create_symlink("reg", "sandbox/link");
        fs::create_link("sandbox/reg", "sandbox/reg2");
        fs::create_fifo("sandbox/fifo");
        struct sockaddr_un addr;
        addr.sun_family = AF_UNIX;
        std::strcpy(addr.sun_path, "sandbox/sock");
        int fd = socket(PF_UNIX, SOCK_STREAM, 0);
        bind(fd, (struct sockaddr*)&addr, sizeof addr);
        scc::util::safe_close(fd);
    }
};
 
TEST_F(FsTest, list_current)
{
    cout << "listing current directory contents" << endl;
    auto files = fs::scan_dir(".");
    ASSERT_GT(files.size(), 0);
    for (auto& f : files)
    {
        cout << f.first << " type: " << f.second << endl;
    }
}
 
TEST_F(FsTest, list_sandbox)
{
    cout << "creating sandbox directory files" << endl;
    create_files();
    cout << "listing sandbox directory contents" << endl;
    auto files = fs::scan_dir("sandbox");
    ASSERT_GT(files.size(), 0);
    for (auto& f : files)
    {
        cout << f.first << " type: " << f.second << endl;
    }
}
 
static bool reg_filt(const string& s, FileType t)
{
    if (s == "reg" && t == FileType::reg)
        return true;
    return false;
}
 
 
TEST_F(FsTest, filter)
{
    create_files();
    auto files = fs::scan_dir("sandbox", reg_filt);
    ASSERT_EQ(files.size(), 1);
    ASSERT_EQ(files.begin()->first, "reg");
    ASSERT_EQ(files.begin()->second, FileType::reg);
}
 
 
TEST_F(FsTest, create_and_delete)
{
    ASSERT_THROW(fs::create_dir("sandbox"), system_error);
    fs::create_reg("sandbox/test");
    auto n = fs::create_tmp_reg("sandbox/test");
    cout << "tmp file: " << n << endl;
    auto d = fs::scan_dir("sandbox");
    for (auto& f : d)
    {
        cout << f.first << " type: " << f.second << endl;
    }
    ASSERT_EQ(d.size(), 2);
    ASSERT_NE(d.find("test"), d.end());
 
    fs::remove(n);
    d = fs::scan_dir("sandbox");
    ASSERT_EQ(d.size(), 1);
    ASSERT_THROW(fs::remove(n), system_error);
 
    fs::remove_all("sandbox");
    d = fs::scan_dir(".");
    ASSERT_EQ(d.find("sandbox"), d.end());
 
    ASSERT_THROW(fs::remove("sandbox"), system_error);
}
 
TEST_F(FsTest, create_types)
{
    create_files();
    
    fs::change_dir("sandbox");
    auto d = fs::scan_dir(".");
    for (auto& f : d)
    {
        cout << "sandbox/" << f.first << " type: " << f.second << ":" << endl;
        auto ty = fs::file_stat(f.first);
        cout << ty << endl;
        ASSERT_EQ(f.second, ty.type);
    }
 
    ASSERT_EQ(fs::read_symlink("link"), "reg");
 
    auto ty = fs::file_stat("/dev/null");
    cout << "/dev/zero " << ty << endl;
    ASSERT_EQ(ty.type, FileType::chr);
 
    fs::change_dir("/dev");
    d = fs::scan_dir(".");
    auto i = std::find_if(d.begin(), d.end(), [](const auto& x) -> bool
    {
        return x.second == FileType::block;
    });
    ASSERT_NE(i, d.end());
    ty = fs::file_stat(i->first);
    cout << "/dev/" << i->first << " " << ty << endl;
    ASSERT_EQ(ty.type, FileType::block);
}
 
TEST_F(FsTest, attributes)
{
    fs::change_dir("sandbox");
 
    fs::create_reg("reg");
    fs::set_mode("reg", 0660);
    fs::create_symlink("reg", "link");
    fs::create_reg("reg2");
 
    const uint64_t NS = 1000000000;
    const uint64_t DAY = 24*60*60*NS;
 
    auto st = fs::file_stat("reg");
    fs::set_times("reg2", st.access_time-DAY, st.mod_time-2*DAY);
    //fs::set_times("link", st.access_time-3*DAY, st.mod_time-4*DAY);
 
    auto d = fs::scan_dir(".");
    for (auto& f : d)
    {
        cout << "sandbox/" << f.first << " type: " << f.second << ":" << endl;
        auto ty = fs::file_stat(f.first);
        cout << ty << endl;
    }
 
    auto streg = fs::file_stat("reg");
    ASSERT_EQ(streg.mode, 0660);
    
    auto streg2 = fs::file_stat("reg2");
    ASSERT_EQ(streg2.mode, 0600);
    ASSERT_EQ(streg2.access_time, streg.access_time-DAY);
    ASSERT_EQ(streg2.mod_time, streg.mod_time-2*DAY);
 
    auto stlink = fs::file_stat("link");
    ASSERT_EQ(stlink.mode, 0777);
 
    // NOTE: can't test the uid / gid settings easily...
 
}
 
TEST(FsExampleTest, sparse_and_trunc)
{
    system_error err;
    fs::remove_all("sandbox", &err);
    fs::create_dir("sandbox");
    auto curdir = fs::get_current_dir();
    cout << "curdir: " << curdir << endl;
 
    fs::change_dir("sandbox");
 
    string s("this is a test of the emergency sizing system\n");
    cout << "sparse test with string len=" << s.size() << endl;
 
    string fn("sparse_file");
 
    auto write_sparse = [&fn, &s](off_t loc)
    {
        // use clib to write data into the middle of the file
        // if we use fstream, the system may truncate the file
 
        // use system wrapper FileDesc to ensure the file is always closed
        scc::util::FileDesc fd(scc::util::safe_open_throw(fn.c_str(), O_WRONLY));
        
        lseek(fd, loc, SEEK_SET);
        safe_write_throw(fd, &s[0], s.size());
        
        cout << "wrote " << s.size() << " bytes at loc " << loc << endl;
    };
 
    fs::create_reg(fn);
    fs::set_size(fn, 16384);            // 16 K file, with a 0 at the end
    
    auto st = fs::file_stat(fn);
    cout << "12288 hole at start of file:\n" << st << endl;
 
    ASSERT_EQ(st.size, 16384);
    ASSERT_EQ(st.alloc_size, 4096);     // the last block has data
 
    auto sm = fs::sparse_map(fn);
    cout << setw(6) << "start" << setw(6) << "data" << endl;
    for (auto& x : sm)
    {
        cout << setw(6) << x.first << setw(6) << x.second << endl;
    }
    
    std::map<int64_t,int64_t> ver;
    
    ver[0] = 12287;                     // 12288 sized hole at 0 (beginning)
    ASSERT_EQ(sm, ver);
 
    write_sparse(1024);                 // write the string at 1024, causing first block to be written
    
    st = fs::file_stat(fn);
    cout << "8192 hole in middle of file\n" << st << endl;
 
    ASSERT_EQ(st.alloc_size, 8192);
 
    sm = fs::sparse_map(fn);
    cout << setw(6) << "start" << setw(6) << "data" << endl;
    for (auto& x : sm)
    {
        cout << setw(6) << x.first << setw(6) << x.second << endl;
    }
 
    ver.clear();
    ver[4096] = 12287;                  // 8192 sized hole at 4096 (middle)
    ASSERT_EQ(sm, ver);
 
    fs::set_size(fn, 12288);
 
    st = fs::file_stat(fn);
    cout << "8192 hole at end of file\n" << st << endl;
 
    ASSERT_EQ(st.alloc_size, 4096);
 
    sm = fs::sparse_map(fn);
    cout << setw(6) << "start" << setw(6) << "data" << endl;
    for (auto& x : sm)
    {
        cout << setw(6) << x.first << setw(6) << x.second << endl;
    }
 
    ver.clear();
    ver[4096] = 12287;                  // 8192 sized hole at 4096 (end)
    ASSERT_EQ(sm, ver);
 
    ifstream f(fn);
    f.seekg(1024);
    string val;
    val.resize(s.size(), '\x01');
    f.read(&val[0], val.size());
    ASSERT_EQ(val, s);
 
    fs::change_dir(curdir);
    fs::remove_all("sandbox");
}
 
TEST_F(FsTest, paths)
{
    auto t = [](const std::string& b, const std::string& p) -> std::string
    {
        auto x = fs::norm_path(b, p);
        cout << "base:" << ">" << b << "< path: >" << p << "< norm: >" << x << "<" << endl;
        return x;
    };
 
    ASSERT_EQ(t("", ""), ".");
    ASSERT_EQ(t("", "."), ".");
    ASSERT_EQ(t(".", ""), ".");
    ASSERT_EQ(t(".", "."), ".");
 
    ASSERT_EQ(t("", "test/.."), ".");
    ASSERT_EQ(t("", "test/../.."), "./..");
 
    ASSERT_EQ(t("", "/"), "/");
    ASSERT_EQ(t("", "/test"), "/test");
    ASSERT_EQ(t("", "/test/"), "/test/");
    ASSERT_EQ(t("/", ""), "/");
    ASSERT_EQ(t("/", "/"), "/");
 
    ASSERT_EQ(t("base", "../../sandbox/../../path"), "./../../path");
 
    ASSERT_EQ(t("/base/", ""), "/base/");
    ASSERT_EQ(t("/base/", "."), "/base");
    ASSERT_EQ(t("/base/", "root"), "/base/root");
    ASSERT_EQ(t("/base", "root"), "/base/root");
    ASSERT_EQ(t("/base/", "sandbox/rel/path"), "/base/sandbox/rel/path");
    ASSERT_EQ(t("/base/sandbox", "../sandbox/path"), "/base/sandbox/path");
    ASSERT_EQ(t("/base/next/../again", "sandbox/next/../path"), "/base/again/sandbox/path");
 
    ASSERT_EQ(t("", "sandbox/rel/path"), "./sandbox/rel/path");
    ASSERT_EQ(t("", "sandbox/rel/../path"), "./sandbox/path");
    ASSERT_EQ(t("", "./sandbox/rel/../path"), "./sandbox/path");
    ASSERT_EQ(t("", "/sandbox/path"), "/sandbox/path");
    ASSERT_EQ(t("", "/sandbox/path/"), "/sandbox/path/");
    ASSERT_EQ(t("", "/sandbox/path"), "/sandbox/path");
    ASSERT_EQ(t("", "/base/../sandbox/next/../../path"), "/path");
    ASSERT_EQ(t("", "/this/../is/a/big/long/path/../../../../../"), "/");
 
    ASSERT_EQ(t("", "/this/../is/a/path/../../../../."), "/..");
    ASSERT_EQ(t("../", "../../sandbox/../../"), "./../../../../");
}