diff options
Diffstat (limited to 'libbb')
| -rw-r--r-- | libbb/copy_file.c | 332 | ||||
| -rw-r--r-- | libbb/libbb.h | 11 |
2 files changed, 198 insertions, 145 deletions
diff --git a/libbb/copy_file.c b/libbb/copy_file.c index 7e5d11e67..113c253b9 100644 --- a/libbb/copy_file.c +++ b/libbb/copy_file.c @@ -1,10 +1,9 @@ /* vi: set sw=4 ts=4: */ /* - * Utility routines. + * Mini copy_file implementation for busybox * - * Copyright (C) tons of folks. Tracking down who wrote what - * isn't something I'm going to worry about... If you wrote something - * here, please feel free to acknowledge your work. + * + * Copyright (C) 2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -20,179 +19,226 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * - * Based in part on code from sash, Copyright (c) 1999 by David I. Bell - * Permission has been granted to redistribute this code under the GPL. - * */ -#include <stdio.h> -#include <errno.h> -#include <utime.h> +#include <sys/types.h> +#include <sys/stat.h> #include <unistd.h> #include <fcntl.h> -#include <sys/stat.h> -#include "libbb.h" +#include <utime.h> +#include <errno.h> +#include <dirent.h> +#include <stdlib.h> +#include "libbb.h" -/* - * Copy one file to another, while possibly preserving its modes, times, and - * modes. Returns TRUE if successful, or FALSE on a failure with an error - * message output. (Failure is not indicated if attributes cannot be set.) - * -Erik Andersen - */ -int -copy_file(const char *src_name, const char *dst_name, - int set_modes, int follow_links, int force_flag, int quiet_flag) +int copy_file(const char *source, const char *dest, int flags) { - FILE *src_file = NULL; - FILE *dst_file = NULL; - struct stat srcStatBuf; - struct stat dstStatBuf; - struct utimbuf times; - int src_status; - int dst_status; - - if (follow_links == TRUE) { - src_status = stat(src_name, &srcStatBuf); - dst_status = stat(dst_name, &dstStatBuf); - } else { - src_status = lstat(src_name, &srcStatBuf); - dst_status = lstat(dst_name, &dstStatBuf); + struct stat source_stat; + struct stat dest_stat; + int dest_exists = 1; + int status = 0; + + if (((flags & CP_PRESERVE_SYMLINKS) && lstat(source, &source_stat) < 0) || + (!(flags & CP_PRESERVE_SYMLINKS) && + stat(source, &source_stat) < 0)) { + perror_msg("%s", source); + return -1; } - if (src_status < 0) { - if (!quiet_flag) { - perror_msg("%s", src_name); + if (stat(dest, &dest_stat) < 0) { + if (errno != ENOENT) { + perror_msg("unable to stat `%s'", dest); + return -1; } - return FALSE; + dest_exists = 0; } - if ((dst_status < 0) || force_flag) { - unlink(dst_name); - dstStatBuf.st_ino = -1; - dstStatBuf.st_dev = -1; + if (dest_exists && source_stat.st_rdev == dest_stat.st_rdev && + source_stat.st_ino == dest_stat.st_ino) { + error_msg("`%s' and `%s' are the same file", source, dest); + return -1; } - if ((srcStatBuf.st_dev == dstStatBuf.st_dev) && - (srcStatBuf.st_ino == dstStatBuf.st_ino)) { - if (!quiet_flag) { - error_msg("Copying file \"%s\" to itself", src_name); + if (S_ISDIR(source_stat.st_mode)) { + DIR *dp; + struct dirent *d; + + if (!(flags & CP_RECUR)) { + error_msg("%s: omitting directory", source); + return -1; } - return FALSE; - } - if (S_ISDIR(srcStatBuf.st_mode)) { - //fprintf(stderr, "copying directory %s to %s\n", srcName, destName); - /* Make sure the directory is writable */ - dst_status = create_path(dst_name, 0777777 ^ umask(0)); - if ((dst_status < 0) && (errno != EEXIST)) { - if (!quiet_flag) { - perror_msg("%s", dst_name); + /* Create DEST. */ + if (dest_exists) { + if (!S_ISDIR(dest_stat.st_mode)) { + error_msg("`%s' is not a directory", dest); + return -1; } - return FALSE; - } - } else if (S_ISLNK(srcStatBuf.st_mode)) { - char link_val[BUFSIZ + 1]; - int link_size; - - //fprintf(stderr, "copying link %s to %s\n", srcName, destName); - /* Warning: This could possibly truncate silently, to BUFSIZ chars */ - link_size = readlink(src_name, &link_val[0], BUFSIZ); - if (link_size < 0) { - if (quiet_flag) { - perror_msg("%s", src_name); + } else { + mode_t mode, saved_umask; + saved_umask = umask(0); + + mode = source_stat.st_mode; + if (!(flags & CP_PRESERVE_STATUS)) + mode = source_stat.st_mode & ~saved_umask; + mode |= S_IRWXU; + + if (mkdir(dest, mode) < 0) { + umask(saved_umask); + perror_msg("cannot create directory `%s'", dest); + return -1; } - return FALSE; + + umask(saved_umask); } - link_val[link_size] = '\0'; - src_status = symlink(link_val, dst_name); - if (src_status < 0) { - if (!quiet_flag) { - perror_msg("%s", dst_name); - } - return FALSE; + + /* Recursively copy files in SOURCE. */ + if ((dp = opendir(source)) == NULL) { + perror_msg("unable to open directory `%s'", source); + status = -1; + goto end; } -#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1) - if (set_modes == TRUE) { - /* Try to set owner, but fail silently like GNU cp */ - lchown(dst_name, srcStatBuf.st_uid, srcStatBuf.st_gid); + + while ((d = readdir(dp)) != NULL) { + char *new_source, *new_dest; + + if (strcmp(d->d_name, ".") == 0 || + strcmp(d->d_name, "..") == 0) + continue; + + new_source = concat_path_file(source, d->d_name); + 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); } -#endif - return TRUE; - } else if (S_ISFIFO(srcStatBuf.st_mode)) { - //fprintf(stderr, "copying fifo %s to %s\n", srcName, destName); - if (mkfifo(dst_name, 0644) < 0) { - if (!quiet_flag) { - perror_msg("%s", dst_name); - } - return FALSE; - } - } else if (S_ISBLK(srcStatBuf.st_mode) || S_ISCHR(srcStatBuf.st_mode) - || S_ISSOCK(srcStatBuf.st_mode)) { - //fprintf(stderr, "copying soc, blk, or chr %s to %s\n", srcName, destName); - if (mknod(dst_name, srcStatBuf.st_mode, srcStatBuf.st_rdev) < 0) { - if (!quiet_flag) { - perror_msg("%s", dst_name); + + /* ??? What if an error occurs in readdir? */ + + if (closedir(dp) < 0) { + perror_msg("unable to close directory `%s'", source); + status = -1; + } + } else if (S_ISREG(source_stat.st_mode)) { + FILE *sfp, *dfp; + + if (dest_exists) { + if (flags & CP_INTERACTIVE) { + fprintf(stderr, "cp: overwrite `%s'? ", dest); + if (!ask_confirmation()) + return 0; } - return FALSE; - } - } else if (S_ISREG(srcStatBuf.st_mode)) { - //fprintf(stderr, "copying regular file %s to %s\n", srcName, destName); - src_file = fopen(src_name, "r"); - if (src_file == NULL) { - if (!quiet_flag) { - perror_msg("%s", src_name); + + if ((dfp = fopen(dest, "w")) == NULL) { + if (!(flags & CP_FORCE)) { + perror_msg("unable to open `%s'", dest); + return -1; + } + + if (unlink(dest) < 0) { + perror_msg("unable to remove `%s'", dest); + return -1; + } + + dest_exists = 0; } - return FALSE; } - dst_file = fopen(dst_name, "w"); - chmod(dst_name, srcStatBuf.st_mode); - if (dst_file == NULL) { - if (!quiet_flag) { - perror_msg("%s", dst_name); + if (!dest_exists) { + int fd; + + if ((fd = open(dest, O_WRONLY|O_CREAT, source_stat.st_mode)) < 0 || + (dfp = fdopen(fd, "w")) == NULL) { + if (fd >= 0) + close(fd); + perror_msg("unable to open `%s'", dest); + return -1; } - fclose(src_file); - return FALSE; } - if (copy_file_chunk(src_file, dst_file, srcStatBuf.st_size)==FALSE) { - goto error_exit; + if ((sfp = fopen(source, "r")) == NULL) { + fclose(dfp); + perror_msg("unable to open `%s'", source); + status = -1; + goto end; + } + + copy_file_chunk(sfp, dfp, source_stat.st_size); + + if (fclose(dfp) < 0) { + perror_msg("unable to close `%s'", dest); + status = -1; } - fclose(src_file); - if (fclose(dst_file) < 0) { - return FALSE; + if (fclose(sfp) < 0) { + 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)) { + if (mknod(dest, source_stat.st_mode, source_stat.st_rdev) < 0) { + perror_msg("unable to create `%s'", dest); + return -1; + } + } else if (S_ISFIFO(source_stat.st_mode)) { + mode_t mode, saved_umask; + saved_umask = umask(0); + + mode = source_stat.st_mode; + if (!(flags & CP_PRESERVE_STATUS)) + mode = source_stat.st_mode & ~saved_umask; + mode |= S_IRWXU; + + if (mkfifo(dest, mode) < 0) { + umask(saved_umask); + perror_msg("cannot create fifo `%s'", dest); + return -1; + } + + umask(saved_umask); + } else if (S_ISLNK(source_stat.st_mode)) { + char buf[BUFSIZ + 1]; - if (set_modes == TRUE) { - /* This is fine, since symlinks never get here */ - if (chown(dst_name, srcStatBuf.st_uid, srcStatBuf.st_gid) < 0) - perror_msg("%s", dst_name); - if (chmod(dst_name, srcStatBuf.st_mode) < 0) - perror_msg("%s", dst_name); - times.actime = srcStatBuf.st_atime; - times.modtime = srcStatBuf.st_mtime; - if (utime(dst_name, ×) < 0) - perror_msg("%s", dst_name); + if (readlink(source, buf, BUFSIZ) < 0) { + perror_msg("cannot read `%s'", source); + return -1; + } + buf[BUFSIZ] = '\0'; + + if (symlink(buf, dest) < 0) { + perror_msg("cannot create symlink `%s'", dest); + return -1; + } + +#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1) + if (flags & CP_PRESERVE_STATUS) + if (lchown(dest, source_stat.st_uid, source_stat.st_gid) < 0) + perror_msg("unable to preserve ownership of `%s'", dest); +#endif + return 0; + } else { + error_msg("internal error: unrecognized file type"); + return -1; } - return TRUE; +end: -error_exit: - perror_msg("%s", dst_name); - fclose(src_file); - fclose(dst_file); + if (flags & CP_PRESERVE_STATUS) { + struct utimbuf times; - return FALSE; -} + times.actime = source_stat.st_atime; + times.modtime = source_stat.st_mtime; + if (utime(dest, ×) < 0) + perror_msg("unable to preserve times of `%s'", dest); + if (chown(dest, source_stat.st_uid, source_stat.st_gid) < 0) { + source_stat.st_mode &= ~(S_ISUID | S_ISGID); + perror_msg("unable to preserve ownership of `%s'", dest); + } + if (chmod(dest, source_stat.st_mode) < 0) + perror_msg("unable to preserve permissions of `%s'", dest); + } -/* END CODE */ -/* -Local Variables: -c-file-style: "linux" -c-basic-offset: 4 -tab-width: 4 -End: -*/ + return 0; +} diff --git a/libbb/libbb.h b/libbb/libbb.h index 19de73ca9..c47a6689e 100644 --- a/libbb/libbb.h +++ b/libbb/libbb.h @@ -93,8 +93,7 @@ int is_in_ino_dev_hashtable(const struct stat *statbuf, char **name); void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name); void reset_ino_dev_hashtable(void); -int copy_file(const char *src_name, const char *dst_name, - int set_modes, int follow_links, int force_flag, int quiet_flag); +int copy_file(const char *source, const char *dest, int flags); int copy_file_chunk(FILE *src_file, FILE *dst_file, unsigned long long chunksize); char *buildName(const char *dirName, const char *fileName); int makeString(int argc, const char **argv, char *buf, int bufLen); @@ -255,4 +254,12 @@ extern int gz_open(FILE *compressed_file, int *pid); #define CT_DOS2UNIX 2 /* extern int convert(char *fn, int ConvType); */ +enum { + CP_PRESERVE_STATUS = 1, + CP_PRESERVE_SYMLINKS = 2, + CP_RECUR = 4, + CP_FORCE = 8, + CP_INTERACTIVE = 16 +}; + #endif /* __LIBBB_H__ */ |