/* vi: set sw=4 ts=4: */ /* * Mini copy_file implementation for busybox * * Copyright (C) 2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu> * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * */ #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <fcntl.h> #include <utime.h> #include <errno.h> #include <dirent.h> #include <stdlib.h> #include <string.h> #include "libbb.h" /* Compiler version-specific crap that should be in a header file somewhere. */ #if !((__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)) #define lchown chown #endif int copy_file(const char *source, const char *dest, int flags) { struct stat source_stat; struct stat dest_stat; int dest_exists = 0; int status = 0; if ((!(flags & FILEUTILS_DEREFERENCE) && lstat(source, &source_stat) < 0) || ((flags & FILEUTILS_DEREFERENCE) && stat(source, &source_stat) < 0)) { bb_perror_msg("%s", source); return -1; } if (lstat(dest, &dest_stat) < 0) { if (errno != ENOENT) { bb_perror_msg("unable to stat `%s'", dest); return -1; } } else { if (source_stat.st_dev == dest_stat.st_dev && source_stat.st_ino == dest_stat.st_ino) { bb_error_msg("`%s' and `%s' are the same file", source, dest); return -1; } dest_exists = 1; } if (S_ISDIR(source_stat.st_mode)) { DIR *dp; struct dirent *d; mode_t saved_umask = 0; if (!(flags & FILEUTILS_RECUR)) { bb_error_msg("%s: omitting directory", source); return -1; } /* Create DEST. */ if (dest_exists) { if (!S_ISDIR(dest_stat.st_mode)) { bb_error_msg("`%s' is not a directory", dest); return -1; } } else { mode_t mode; saved_umask = umask(0); mode = source_stat.st_mode; if (!(flags & FILEUTILS_PRESERVE_STATUS)) mode = source_stat.st_mode & ~saved_umask; mode |= S_IRWXU; if (mkdir(dest, mode) < 0) { umask(saved_umask); bb_perror_msg("cannot create directory `%s'", dest); return -1; } umask(saved_umask); } /* Recursively copy files in SOURCE. */ if ((dp = bb_opendir(source)) == NULL) { status = -1; goto preserve_status; } while ((d = readdir(dp)) != NULL) { char *new_source, *new_dest; new_source = concat_subpath_file(source, d->d_name); if(new_source == NULL) continue; new_dest = concat_path_file(dest, d->d_name); if (copy_file(new_source, new_dest, flags) < 0) status = -1; free(new_source); free(new_dest); } /* closedir have only EBADF error, but "dp" not changes */ closedir(dp); if (!dest_exists && chmod(dest, source_stat.st_mode & ~saved_umask) < 0) { bb_perror_msg("unable to change permissions of `%s'", dest); status = -1; } } else if (S_ISREG(source_stat.st_mode) || (flags & FILEUTILS_DEREFERENCE)) { int src_fd; int dst_fd; #ifdef CONFIG_FEATURE_PRESERVE_HARDLINKS char *link_name; if (!(flags & FILEUTILS_DEREFERENCE) && is_in_ino_dev_hashtable(&source_stat, &link_name)) { if (link(link_name, dest) < 0) { bb_perror_msg("unable to link `%s'", dest); return -1; } return 0; } add_to_ino_dev_hashtable(&source_stat, dest); #endif src_fd = open(source, O_RDONLY); if (src_fd == -1) { bb_perror_msg("unable to open `%s'", source); return(-1); } if (dest_exists) { if (flags & FILEUTILS_INTERACTIVE) { fprintf(stderr, "%s: overwrite `%s'? ", bb_applet_name, dest); if (!bb_ask_confirmation()) { close (src_fd); return 0; } } dst_fd = open(dest, O_WRONLY|O_TRUNC); if (dst_fd == -1) { if (!(flags & FILEUTILS_FORCE)) { bb_perror_msg("unable to open `%s'", dest); close(src_fd); return -1; } if (unlink(dest) < 0) { bb_perror_msg("unable to remove `%s'", dest); close(src_fd); return -1; } goto dest_removed; } } else { dest_removed: dst_fd = open(dest, O_WRONLY|O_CREAT, source_stat.st_mode); if (dst_fd == -1) { bb_perror_msg("unable to open `%s'", dest); close(src_fd); return(-1); } } if (bb_copyfd_eof(src_fd, dst_fd) == -1) status = -1; if (close(dst_fd) < 0) { bb_perror_msg("unable to close `%s'", dest); status = -1; } if (close(src_fd) < 0) { bb_perror_msg("unable to close `%s'", source); status = -1; } } else if (S_ISBLK(source_stat.st_mode) || S_ISCHR(source_stat.st_mode) || S_ISSOCK(source_stat.st_mode) || S_ISFIFO(source_stat.st_mode) || S_ISLNK(source_stat.st_mode)) { if (dest_exists) { if((flags & FILEUTILS_FORCE) == 0) { fprintf(stderr, "`%s' exists\n", dest); return -1; } if(unlink(dest) < 0) { bb_perror_msg("unable to remove `%s'", dest); return -1; } } if (S_ISFIFO(source_stat.st_mode)) { if (mkfifo(dest, source_stat.st_mode) < 0) { bb_perror_msg("cannot create fifo `%s'", dest); return -1; } } else if (S_ISLNK(source_stat.st_mode)) { char *lpath; lpath = xreadlink(source); if (symlink(lpath, dest) < 0) { bb_perror_msg("cannot create symlink `%s'", dest); return -1; } free(lpath); if (flags & FILEUTILS_PRESERVE_STATUS) if (lchown(dest, source_stat.st_uid, source_stat.st_gid) < 0) bb_perror_msg("unable to preserve ownership of `%s'", dest); return 0; } else { if (mknod(dest, source_stat.st_mode, source_stat.st_rdev) < 0) { bb_perror_msg("unable to create `%s'", dest); return -1; } } } else { bb_error_msg("internal error: unrecognized file type"); return -1; } preserve_status: if (flags & FILEUTILS_PRESERVE_STATUS) { struct utimbuf times; char *msg="unable to preserve %s of `%s'"; times.actime = source_stat.st_atime; times.modtime = source_stat.st_mtime; if (utime(dest, ×) < 0) bb_perror_msg(msg, "times", dest); if (chown(dest, source_stat.st_uid, source_stat.st_gid) < 0) { source_stat.st_mode &= ~(S_ISUID | S_ISGID); bb_perror_msg(msg, "ownership", dest); } if (chmod(dest, source_stat.st_mode) < 0) bb_perror_msg(msg, "permissions", dest); } return status; }