bitbake: fetch2/git: Add support for fast initial shallow fetch

When `ud.shallow == 1`:
- Prefer an initial shallow clone over an initial full bare clone,
  while still utilizing any already existing full bare clones.
- If the Git error "Server does not allow request for unadvertised object"
  occurs, the initial full bare clone is fetched automatically.
  This may happen if the Git server does not allow the request
  or if the Git client has issues with this functionality,
  especially with the Git client from Ubuntu 20.04.

This improves:
- Resolve timeout issues during initial clones on slow internet connections
  by reducing the amount of data transferred.
- Eliminate the need to use an HTTPS tarball `SRC_URI`
  to reduce data transfer.
- Allow SSH-based authentication (e.g. cert and agent-based) when
  using non-public repos, so additional HTTPS tokens may not be required.

(Bitbake rev: 457288b2fda86fd00cdcaefac616129b0029e1f9)

Signed-off-by: Stefan Koch <stefan-koch@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions