Right now cpio ignores the "-u" flag. (-u: Copy unconditionally (normally, an older file will not replace a newer file with the same name).)
For directories, it behaves like "-u" is not specified, and for regular files, symlinks, devnode it behaves like "-u" is specified (sort of..) $ mkdir a $ touch a/b $ find a | cpio -o -H newc >a.cpio $ # at this point, a and a/b still exist $ cpio -i <a.cpio cpio: a: File exists $ echo $? 1 * EEXIST for a. This is behaving like "-u" not specified, so not replacing existing file/path * no error for extracting a/b, albeit a/b already exists. This is like "-u" is specified. * toybox cpio returns with non-zero exit status. Should we (1) make "-u" the default behavior of toybox, and not print an error when "a" already exists? Or (2) we make "-u" a real option, and toybox would only overwrite existing files if "-u"? (that is, "-u" would need to be specified explicitly to get the current behavior) Another question is, if we go (2), how do we handle existing files for the non-"-u" case? (2.1) Do we just skip the file and print an EEXIST message? Or (2.2) do we check the timestamp like what GNU did? I think for simplicity (in terms of feature and code size), we should just go (1). But for SUSv2 compatibility we should do (2), at least (2.1). I have a WIP patch for (2.1), but I'd like to discuss this before moving this forward. -- Yi-yo Chiang Software Engineer yochi...@google.com
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