Can busybox unzip tool overwrite symlinks?

Question

I'm using the Busybox 1.32.0 package tools in an embedded device. When I'm in Ubuntu based x64 platforms, the unzip tool packaged there can extract over a destination directory without prompting any errors if I'm trying to extract a symlink. However, in the case of Busybox, when I try to do this and there's already a symlink with the same link stored there I get this error:

unzip: '/usr/local/bin/sample.so.1' exists but is not a regular file

Sure it's not a regular file, because it's actually a symlink. But what I want to do is either:

• Continue with the unzip process omitting this files.
• Replace this files with the symlink files stored in the zip.

Is there any way to achieve this?

Answer 1

No, it can't.

You'll have to remove it first.

This is the actual source code:

                /* Does target file already exist? */
                {
                        int mode = get_lstat_mode(dst_fn);
                        if (mode == -1) {
                                /* ENOENT: does not exist */
                                goto do_open_and_extract;
                        }
                        if (overwrite == O_NEVER) {
                                goto skip_cmpsize;
                        }
                        if (!S_ISREG(mode)) {
 fishy:
                                bb_error_msg_and_die("'%s' exists but is not a %
s",
                                        printable_string(dst_fn),
                                        "regular file"
                                );
                        }
                        if (overwrite == O_ALWAYS) {
                                goto do_open_and_extract;
                        }

As you see, no way to bypass that error.