It is fragile, as there is no way for the revision machinery to say "but
now I want to traverse the graph ignoring the graft file" e.g. when
pushing commits to a remote repository (which, as a consequence, can
miss commits).

And we already have a better solution with `git replace --graft <comit>
[<parent>...]`.

Changes since v6:

- Made --convert-graft-file issue a mere warning (instead of an error) when
  a graft leaves the parents unchanged, and is hence unnecessary.

- Modified the regression test for --convert-graft-file to succeed even when
  the GPG prerequisite is unmet (thanks, Gábor!).

- Reassured by Stefan's feedback, I refrained from reinstating the contrib/
  script.

Johannes Schindelin (12):
  argv_array: offer to split a string by whitespace
  commit: Let the callback of for_each_mergetag return on error
  replace: avoid using die() to indicate a bug
  replace: "libify" create_graft() and callees
  replace: prepare create_graft() for converting graft files wholesale
  replace: introduce --convert-graft-file
  Add a test for `git replace --convert-graft-file`
  Deprecate support for .git/info/grafts
  filter-branch: stop suggesting to use grafts
  technical/shallow: stop referring to grafts
  technical/shallow: describe why shallow cannot use replace refs
  Remove obsolete script to convert grafts to replace refs

 Documentation/git-filter-branch.txt       |   2 +-
 Documentation/git-replace.txt             |  11 +-
 Documentation/technical/shallow.txt       |  20 +-
 advice.c                                  |   2 +
 advice.h                                  |   1 +
 argv-array.c                              |  20 ++
 argv-array.h                              |   2 +
 builtin/replace.c                         | 234 ++++++++++++++++------
 commit.c                                  |  18 +-
 commit.h                                  |   4 +-
 contrib/convert-grafts-to-replace-refs.sh |  28 ---
 log-tree.c                                |  13 +-
 t/t6001-rev-list-graft.sh                 |   9 +
 t/t6050-replace.sh                        |  28 +++
 14 files changed, 274 insertions(+), 118 deletions(-)
 delete mode 100755 contrib/convert-grafts-to-replace-refs.sh

base-commit: 1f1cddd558b54bb0ce19c8ace353fd07b758510d

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