message: nydus-image: remove some uncommonly used short options
  Remove some uncommonly used short options.
diff: @@ -143,11 +143,9 @@ impl OutputSerializer {
  fn prepare_cmd_args(bti_string: &'static str) -> App {
  let arg_chunk_dict = Arg::new("chunk-dict")
  .long("chunk-dict")
  - .short('M')
  .help("Set a chunk dictionary for chunk deduplication");
  let arg_prefetch_policy = Arg::new("prefetch-policy")
  .long("prefetch-policy")
  - .short('P')
  .help("Set policy for blob data prefetch")
  .required(false)
  .default_value("none")
  @@ -243,14 +241,12 @@ fn prepare_cmd_args(bti_string: &'static str) -> App {
  .arg(
  Arg::new("chunk-size")
  .long("chunk-size")
  - .short('S')
  .help("Set size of data chunk, must be power of two and between 0x1000-0x1000000:")
  .required(false),
  )
  .arg(
  Arg::new("compressor")
  .long("compressor")
  - .short('c')
  .help("Set algorithm to compress chunks:")
  .required(false)
  .default_value("zstd")
  @@ -259,7 +255,6 @@ fn prepare_cmd_args(bti_string: &'static str) -> App {
  .arg(
  Arg::new("digester")
  .long("digester")
  - .short('d')
  .help("Set algorithm to digest inodes and chunks:")
  .required(false)
  .default_value("sha256")
  @@ -279,21 +274,18 @@ fn prepare_cmd_args(bti_string: &'static str) -> App {
  .arg(
  Arg::new("parent-bootstrap")
  .long("parent-bootstrap")
  - .short('p')
  .help("Path to parent/referenced RAFS filesystem metadata blob (optional)")
  .required(false),
  )
  .arg(
  Arg::new("aligned-chunk")
  .long("aligned-chunk")
  - .short('A')
  .help("Align uncompressed data chunk to 4K, apply to RAFS V5 only")
  .action(ArgAction::SetTrue)
  )
  .arg(
  Arg::new("repeatable")
  .long("repeatable")
  - .short('R')
  .help("Generate reproducible RAFS metadata")
  .action(ArgAction::SetTrue)
  .required(false),
  @@ -308,7 +300,6 @@ fn prepare_cmd_args(bti_string: &'static str) -> App {
  .arg(
  Arg::new("whiteout-spec")
  .long("whiteout-spec")
  - .short('W')
  .help("Set type of whiteout specification:")
  .default_value("oci")
  .value_parser(["oci", "overlayfs", "none"])
  @@ -442,7 +433,6 @@ fn prepare_cmd_args(bti_string: &'static str) -> App {
  .arg(
  Arg::new("chunk-dict")
  .long("chunk-dict")
  - .short('M')
  .help("Specify a chunk dictionary for chunk deduplication"),
  )
  .arg(
  @@ -482,7 +472,7 @@ fn prepare_cmd_args(bti_string: &'static str) -> App {
  .arg(
  Arg::new("log-file")
  .long("log-file")
  - .short('o')
  + .short('L')
  .help("Set log file path")
  .required(false)
  .global(true),
  