• Michael Forney's avatar
    kbuild: Use ls(1) instead of stat(1) to obtain file size · a670b0b4
    Michael Forney authored
    stat(1) is not standardized and different implementations have their own
    (conflicting) flags for querying the size of a file.
    
    ls(1) provides the same information (value of st.st_size) in the 5th
    column, except when the file is a character or block device. This output
    is standardized[0]. The -n option turns on -l, which writes lines
    formatted like
    
      "%s %u %s %s %u %s %s\n", <file mode>, <number of links>,
          <owner name>, <group name>, <size>, <date and time>,
          <pathname>
    
    but instead of writing the <owner name> and <group name>, it writes the
    numeric owner and group IDs (this avoids /etc/passwd and /etc/group
    lookups as well as potential field splitting issues).
    
    The <size> field is specified as "the value that would be returned for
    the file in the st_size field of struct stat".
    
    To avoid duplicating logic in several locations in the tree, create
    scripts/file-size.sh and update callers to use that instead of stat(1).
    
    [0] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ls.html#tag_20_73_10Signed-off-by: 's avatarMichael Forney <forney@google.com>
    Signed-off-by: 's avatarMasahiro Yamada <yamada.masahiro@socionext.com>
    a670b0b4
file-size.sh 86 Bytes