[RFC PATCH 00/10] fetch: make sure submodule oids are fetched

Currently when git-fetch is asked to recurse into submodules, it dispatches a plain "git-fetch -C <submodule-dir>" (and some submodule related options such as prefix and recusing strategy, but) without any information of the remote or the tip that should be fetched.

This works surprisingly well in some workflows, not so well in others, which this series aims to fix.

The first patches provide new basic functionality and do some refactoring; the interesting part is in the two last patches.

Thanks, Stefan

Stefan Beller (10):
  string_list: print_string_list to use trace_printf
  string-list.h: add string_list_pop function.
  sha1-array: provide oid_array_remove_if
  submodule.c: convert submodule_move_head new argument to object id
  submodule.c: fix indentation
  submodule.c: sort changed_submodule_names before searching it
  submodule: move global changed_submodule_names into fetch submodule
    struct
  submodule.c: do not copy around submodule list
  submodule: fetch in submodules git directory instead of in worktree
  fetch: retry fetching submodules if sha1 were not fetched

 builtin/fetch.c             |   9 +-
 entry.c                     |   6 +-
 sha1-array.c                |  39 ++++++++
 sha1-array.h                |   3 +
 string-list.c               |  12 ++-
 string-list.h               |   6 ++
 submodule.c                 | 194 +++++++++++++++++++++++++++---------
 submodule.h                 |   2 +-
 t/t5526-fetch-submodules.sh |  23 ++++-
 unpack-trees.c              |  13 +--
 10 files changed, 241 insertions(+), 66 deletions(-)