diff options
Diffstat (limited to 'libbb/copy_file.c')
| -rw-r--r-- | libbb/copy_file.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/libbb/copy_file.c b/libbb/copy_file.c new file mode 100644 index 0000000..64b65b9 --- /dev/null +++ b/libbb/copy_file.c @@ -0,0 +1,180 @@ +/* vi: set sw=4 ts=4: */ +/* + * Utility routines. + * + * 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. + * + * 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 + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * 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 <unistd.h> +#include <fcntl.h> +#include <sys/stat.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 *srcName, const char *destName, + int setModes, int followLinks, int forceFlag) +{ + int rfd; + int wfd; + int status; + struct stat srcStatBuf; + struct stat dstStatBuf; + struct utimbuf times; + + if (followLinks == TRUE) + status = stat(srcName, &srcStatBuf); + else + status = lstat(srcName, &srcStatBuf); + + if (status < 0) { + perror_msg("%s", srcName); + return FALSE; + } + + if (followLinks == TRUE) + status = stat(destName, &dstStatBuf); + else + status = lstat(destName, &dstStatBuf); + + if (status < 0 || forceFlag==TRUE) { + unlink(destName); + dstStatBuf.st_ino = -1; + dstStatBuf.st_dev = -1; + } + + if ((srcStatBuf.st_dev == dstStatBuf.st_dev) && + (srcStatBuf.st_ino == dstStatBuf.st_ino)) { + error_msg("Copying file \"%s\" to itself", srcName); + return FALSE; + } + + if (S_ISDIR(srcStatBuf.st_mode)) { + //fprintf(stderr, "copying directory %s to %s\n", srcName, destName); + /* Make sure the directory is writable */ + status = mkdir(destName, 0777777 ^ umask(0)); + if (status < 0 && errno != EEXIST) { + perror_msg("%s", destName); + 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(srcName, &link_val[0], BUFSIZ); + if (link_size < 0) { + perror_msg("%s", srcName); + return FALSE; + } + link_val[link_size] = '\0'; + status = symlink(link_val, destName); + if (status < 0) { + perror_msg("%s", destName); + return FALSE; + } +#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1) + if (setModes == TRUE) { + /* Try to set owner, but fail silently like GNU cp */ + lchown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid); + } +#endif + return TRUE; + } else if (S_ISFIFO(srcStatBuf.st_mode)) { + //fprintf(stderr, "copying fifo %s to %s\n", srcName, destName); + if (mkfifo(destName, 0644) < 0) { + perror_msg("%s", destName); + 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(destName, srcStatBuf.st_mode, srcStatBuf.st_rdev) < 0) { + perror_msg("%s", destName); + return FALSE; + } + } else if (S_ISREG(srcStatBuf.st_mode)) { + //fprintf(stderr, "copying regular file %s to %s\n", srcName, destName); + rfd = open(srcName, O_RDONLY); + if (rfd < 0) { + perror_msg("%s", srcName); + return FALSE; + } + + wfd = open(destName, O_WRONLY | O_CREAT | O_TRUNC, + srcStatBuf.st_mode); + if (wfd < 0) { + perror_msg("%s", destName); + close(rfd); + return FALSE; + } + + if (copy_file_chunk(rfd, wfd, srcStatBuf.st_size)==FALSE) + goto error_exit; + + close(rfd); + if (close(wfd) < 0) { + return FALSE; + } + } + + if (setModes == TRUE) { + /* This is fine, since symlinks never get here */ + if (chown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid) < 0) + perror_msg_and_die("%s", destName); + if (chmod(destName, srcStatBuf.st_mode) < 0) + perror_msg_and_die("%s", destName); + times.actime = srcStatBuf.st_atime; + times.modtime = srcStatBuf.st_mtime; + if (utime(destName, ×) < 0) + perror_msg_and_die("%s", destName); + } + + return TRUE; + + error_exit: + perror_msg("%s", destName); + close(rfd); + close(wfd); + + return FALSE; +} + +/* END CODE */ +/* +Local Variables: +c-file-style: "linux" +c-basic-offset: 4 +tab-width: 4 +End: +*/ |