125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
/*
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ICFS: Interactively Controlled File System
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Copyright (C) 2024-2025 Fedir Kovalov
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This program can be distributed under the terms of the GNU GPLv2.
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See the file LICENSE.
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*/
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#define _GNU_SOURCE
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#include "sourcefs.h"
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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static struct source_files_handle {
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int root_fd;
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} handle;
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const char *source_filename_translate(const char *filename) {
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if (strcmp("/", filename) == 0) {
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return ".";
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} else {
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return filename + 1;
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}
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}
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int source_init(const char *root_path) {
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int root_fd = open(root_path, O_PATH);
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if (root_fd == -1) {
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return -1;
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}
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handle.root_fd = root_fd;
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return 0;
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}
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int source_mkdir(const char *filename, mode_t mode) {
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const char *relative_filename = source_filename_translate(filename);
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return mkdirat(handle.root_fd, relative_filename, mode);
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}
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int source_unlink(const char *filename) {
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const char *relative_filename = source_filename_translate(filename);
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return unlinkat(handle.root_fd, relative_filename, 0);
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}
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int source_stat(const char *restrict filename, struct stat *restrict statbuf) {
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const char *relative_filename = source_filename_translate(filename);
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return fstatat(handle.root_fd, relative_filename, statbuf, 0);
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}
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int source_rmdir(const char *filename) {
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const char *relative_filename = source_filename_translate(filename);
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return unlinkat(handle.root_fd, relative_filename, AT_REMOVEDIR);
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}
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int source_symlink(const char *target, const char *linkpath) {
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const char *relative_linkpath = source_filename_translate(linkpath);
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return symlinkat(target, handle.root_fd, relative_linkpath);
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}
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DIR *source_opendir(const char *filename) {
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const char *relative_filename = source_filename_translate(filename);
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int fd = openat(handle.root_fd, relative_filename, 0);
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if (fd < 0) {
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perror("Openat failed");
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return NULL;
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}
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DIR *dir_pointer = fdopendir(fd);
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return dir_pointer;
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}
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int source_rename(const char *oldpath, const char *newpath) {
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const char *relative_oldpath = source_filename_translate(oldpath);
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const char *relative_newpath = source_filename_translate(newpath);
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return renameat(handle.root_fd, relative_oldpath, handle.root_fd,
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relative_newpath);
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}
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int source_link(const char *oldpath, const char *newpath) {
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const char *relative_oldpath = source_filename_translate(oldpath);
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const char *relative_newpath = source_filename_translate(newpath);
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return linkat(handle.root_fd, relative_oldpath, handle.root_fd,
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relative_newpath, 0);
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// NOTE: perhaps the flags here need to be reevaluated.
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}
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int source_chmod(const char *filename, mode_t mode) {
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const char *relative_filename = source_filename_translate(filename);
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return fchmodat(handle.root_fd, relative_filename, mode, 0);
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// NOTE: perhaps the flags here need to be reevaluated.
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}
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int source_chown(const char *filename, uid_t owner, gid_t group) {
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const char *relative_filename = source_filename_translate(filename);
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return fchownat(handle.root_fd, filename, owner, group, AT_SYMLINK_NOFOLLOW);
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}
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int source_truncate(const char *filename, off_t length) {
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const char *relative_filename = source_filename_translate(filename);
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int fd = openat(handle.root_fd, relative_filename, 0);
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if (fd < 0) {
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perror("Openat failed");
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return -1;
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}
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return ftruncate(fd, length);
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}
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int source_open(const char *filename, int flags) {
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const char *relative_filename = source_filename_translate(filename);
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return openat(handle.root_fd, relative_filename, flags);
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}
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int source_create(const char *filename, int flags, mode_t mode) {
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const char *relative_filename = source_filename_translate(filename);
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return openat(handle.root_fd, relative_filename, flags, mode);
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}
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