Rewrite cp and mv to be SUSv2 compliant.

1 files changed, 189 insertions, 143 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, &times) < 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, &times) < 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;
+}