fuse2

#define FUSE_USE_VERSION 28
#include <fuse.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <sys/time.h>

static const char *dirpath = "/home/almond/Documents";

void writelog(const char *path)
{
    char *filename = strrchr(path, '/') + 1;
    char *extension = strrchr(filename, '.');

    char text[100];
    time_t now = time(NULL);
    struct tm *t = localtime(&now);
    strftime(text, sizeof(text) - 1, "%H_%M_%S:%d-%m-%Y", t);

    FILE *logfile = fopen("log.txt", "a");

    if (extension != NULL)
    {
        *extension = '\0';
        fprintf(logfile, "%s.%s.%s\n", filename, text, extension + 1);
    }
    else
        fprintf(logfile, "%s.%s.unknown\n", filename, text);
    fclose(logfile);
}

static int xmp_getattr(const char *path, struct stat *stbuf)
{
    int res;
    char fpath[1000];

    sprintf(fpath, "%s%s", dirpath, path);

    res = lstat(fpath, stbuf);

    if (res == -1)
        return -errno;

    return 0;
}

static int xmp_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi)
{
    char fpath[1000];

    if (strcmp(path, "/") == 0)
    {
        path = dirpath;
        sprintf(fpath, "%s", path);
    }
    else
        sprintf(fpath, "%s%s", dirpath, path);

    int res = 0;

    DIR *dp;
    struct dirent *de;
    (void)offset;
    (void)fi;

    dp = opendir(fpath);

    if (dp == NULL)
        return -errno;

    while ((de = readdir(dp)) != NULL)
    {
        struct stat st;

        memset(&st, 0, sizeof(st));

        st.st_ino = de->d_ino;
        st.st_mode = de->d_type << 12;
        res = (filler(buf, de->d_name, &st, 0));

        if (res != 0)
            break;
    }

    closedir(dp);

    return 0;
}

static int xmp_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi)
{
    char fpath[1000];
    if (strcmp(path, "/") == 0)
    {
        path = dirpath;

        sprintf(fpath, "%s", path);
    }
    else
        sprintf(fpath, "%s%s", dirpath, path);

    int res = 0;
    int fd = 0;

    (void)fi;

    fd = open(fpath, O_RDONLY);

    if (fd == -1)
        return -errno;

    res = pread(fd, buf, size, offset);

    if (res == -1)
        res = -errno;

    close(fd);

    return res;
}

static int xmp_mknod(const char *path, mode_t mode, dev_t rdev)
{

    char fpath[1000];
    if (strcmp(path, "/") == 0)
    {
        path = dirpath;

        sprintf(fpath, "%s", path);
    }
    else
        sprintf(fpath, "%s%s", dirpath, path);

    int res;
    if (S_ISREG(mode))
    {
        res = open(fpath, O_CREAT | O_EXCL | O_WRONLY, mode);
        if (res >= 0)
            res = close(res);
    }
    else if (S_ISFIFO(mode))
        res = mkfifo(fpath, mode);
    else
        res = mknod(fpath, mode, rdev);
    if (res == -1)
        return -errno;

    return 0;
}

static int xmp_write(const char *path, const char *buf, size_t size, off_t offset, struct fuse_file_info *fi)
{
    char fpath[1000];
    if (strcmp(path, "/") == 0)
    {
        path = dirpath;

        sprintf(fpath, "%s", path);
    }
    else
        sprintf(fpath, "%s%s", dirpath, path);

    int fd = 0;
    int res = 0;

    (void)fi;

    fd = open(fpath, O_WRONLY);

    if (fd == -1)
        return -errno;

    res = pwrite(fd, buf, size, offset);
    if (res == -1)
        res = -errno;
    else
        writelog(path);

    close(fd);
    return res;
}

static int xmp_unlink(const char *path)
{
    int res;

    char fpath[1000];
    if (strcmp(path, "/") == 0)
    {
        path = dirpath;

        sprintf(fpath, "%s", path);
    }
    else
        sprintf(fpath, "%s%s", dirpath, path);

    res = unlink(fpath);
    if (res == -1)
        return -errno;

    return 0;
}

static int xmp_truncate(const char *path, off_t size)
{
    int res;

    char fpath[1000];
    if (strcmp(path, "/") == 0)
    {
        path = dirpath;

        sprintf(fpath, "%s", path);
    }
    else
        sprintf(fpath, "%s%s", dirpath, path);

    res = truncate(fpath, size);
    if (res == -1)
        return -errno;

    return 0;
}

static struct fuse_operations xmp_oper = {
    .getattr = xmp_getattr,
    .readdir = xmp_readdir,
    .read = xmp_read,
    .write = xmp_write,
    .mknod = xmp_mknod,
    .unlink = xmp_unlink,
    // .truncate = xmp_truncate,
};

int main(int argc, char *argv[])
{
    umask(0);
    return fuse_main(argc, argv, &xmp_oper, NULL);
}