[PATCH 0/6] breaking changes: switch default initial branch name to "main"

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From: Phillip Wood <phillip.wood@xxxxxxxxxxxxx>

This series switches the default branch name from "master" to "main"
when WITH_BREAKING_CHANGES is enabled. We have been warning that the
default name will change since 675704c74dd (init: provide useful advice
about init.defaultBranch, 2020-12-11) and the major git forges have all
switched their default branch name to "main", so I think it makes sense
to change the default branch name in git to match the wider ecosystem.

The first five patches update tests that currently require a default
branch name different to "main". The sixth patch then changes the
default branch "main" and removes GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
when WITH_BREAKING_CHANGES is enabled. Patch 2 is quite large but
is mechanically generated so it should be possible to review it by
checking that the changes can be reproduced.

This is an alternative to changing the branch name now as suggested in
https://lore.kernel.org<pull.1961.git.1756183921623.gitgitgadget@xxxxxxxxx

Base-Commit: f814da676ae46aac5be0a98b99373a76dee6cedb
Published-As: https://github.com/phillipwood/git/releases/tag/pw%2Finitial-branch-is-main%2Fv1
View-Changes-At: https://github.com/phillipwood/git/compare/f814da676...487d1a331
Fetch-It-Via: git fetch https://github.com/phillipwood/git pw/initial-branch-is-main/v1


Phillip Wood (6):
  t0018: switch default branch name to main
  t4013: switch default branch name to main
  t9902: switch default branch name to main
  t0613: stop setting default initial branch
  t1403: remove dependency on GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
  breaking-changes: switch default branch to main

 Documentation/BreakingChanges.adoc            |   5 +
 Documentation/git-init.adoc                   |  12 +-
 advice.c                                      |   2 +
 advice.h                                      |   2 +
 ci/run-build-and-tests.sh                     |   1 -
 refs.c                                        |  16 +-
 t/t0001-init.sh                               |   9 +-
 t/t0018-advice.sh                             |   8 +-
 t/t0613-reftable-write-options.sh             |  18 +-
 t/t1403-show-ref.sh                           |   6 +-
 t/t4013-diff-various.sh                       | 228 +++++++++---------
 ...ree_--cc_--patch-with-stat_--summary_main} |   2 +-
 ...iff.diff-tree_--cc_--patch-with-stat_main} |   2 +-
 ...r => diff.diff-tree_--cc_--shortstat_main} |   2 +-
 ...diff.diff-tree_--cc_--stat_--summary_main} |   2 +-
 ...master => diff.diff-tree_--cc_--stat_main} |   2 +-
 ...e_--cc_master => diff.diff-tree_--cc_main} |   2 +-
 ...master => diff.diff-tree_-c_--abbrev_main} |   2 +-
 ...> diff.diff-tree_-c_--stat_--summary_main} |   2 +-
 ...t_master => diff.diff-tree_-c_--stat_main} |   2 +-
 ...-tree_-c_master => diff.diff-tree_-c_main} |   2 +-
 ...-tree_-m_master => diff.diff-tree_-m_main} |   2 +-
 ...-p_-m_master => diff.diff-tree_-p_-m_main} |   2 +-
 t/t4013/diff.diff-tree_-p_main                |   2 +
 t/t4013/diff.diff-tree_-p_master              |   2 -
 t/t4013/diff.diff-tree_main                   |   2 +
 t/t4013/diff.diff-tree_master                 |   2 -
 t/t4013/diff.diff_--dirstat_--cc_main~1_main  |   3 +
 .../diff.diff_--dirstat_--cc_master~1_master  |   3 -
 t/t4013/diff.diff_--dirstat_main~1_main~2     |   3 +
 t/t4013/diff.diff_--dirstat_master~1_master~2 |   3 -
 ...ff.diff_--line-prefix=abc_main_main^_side} |   2 +-
 ...master^_side => diff.diff_main_main^_side} |   2 +-
 ...mat-patch_--attach_--stdout_initial..main} |   2 +-
 ...at-patch_--attach_--stdout_initial..main^} |   2 +-
 ...e_--stdout_--numbered-files_initial..main} |   2 +-
 ...t_--subject-prefix=TESTCASE_initial..main} |   2 +-
 ...mat-patch_--inline_--stdout_initial..main} |   2 +-
 ...at-patch_--inline_--stdout_initial..main^} |   2 +-
 ...t-patch_--inline_--stdout_initial..main^^} |   2 +-
 ...--stdout_--cover-letter_-n_initial..main^} |   2 +-
 ...atch_--stdout_--no-numbered_initial..main} |   2 +-
 ...t-patch_--stdout_--numbered_initial..main} |   2 +-
 ... diff.format-patch_--stdout_initial..main} |   2 +-
 ...diff.format-patch_--stdout_initial..main^} |   2 +-
 ..._-m_-p_master => diff.log_--cc_-m_-p_main} |   2 +-
 t/t4013/diff.log_--decorate=full_--all        |   2 +-
 ..._--decorate=full_--clear-decorations_--all |   2 +-
 ...f.log_--decorate=full_--decorate-all_--all |   2 +-
 t/t4013/diff.log_--decorate_--all             |   2 +-
 ...f.log_--decorate_--clear-decorations_--all |   2 +-
 .../diff.log_--decorate_--decorate-all_--all  |   2 +-
 ... diff.log_--diff-merges=first-parent_main} |   2 +-
 ..._--diff-merges=off_-p_--first-parent_main} |   2 +-
 ..._--first-parent_--diff-merges=off_-p_main} |   2 +-
 ...g_--no-diff-merges_-p_--first-parent_main} |   2 +-
 ..._--patch-with-stat_--summary_main_--_dir_} |   2 +-
 ...master => diff.log_--patch-with-stat_main} |   2 +-
 ...> diff.log_--patch-with-stat_main_--_dir_} |   2 +-
 ...oot_--cc_--patch-with-stat_--summary_main} |   2 +-
 ...g_--root_--patch-with-stat_--summary_main} |   2 +-
 ...=> diff.log_--root_--patch-with-stat_main} |   2 +-
 ...-root_-c_--patch-with-stat_--summary_main} |   2 +-
 ...root_-p_master => diff.log_--root_-p_main} |   2 +-
 ...log_--root_master => diff.log_--root_main} |   2 +-
 ...ter => diff.log_-GF_-p_--pickaxe-all_main} |   2 +-
 ...log_-GF_-p_master => diff.log_-GF_-p_main} |   2 +-
 ...{diff.log_-SF_master => diff.log_-GF_main} |   2 +-
 ...aster => diff.log_-IA_-IB_-I1_-I2_-p_main} |   2 +-
 ...log_-SF_-p_master => diff.log_-SF_-p_main} |   2 +-
 ...{diff.log_-GF_master => diff.log_-SF_main} |   2 +-
 t/t4013/diff.log_-SF_main_--max-count=0       |   2 +
 ...ount=2 => diff.log_-SF_main_--max-count=1} |   2 +-
 t/t4013/diff.log_-SF_main_--max-count=2       |   7 +
 t/t4013/diff.log_-SF_master_--max-count=0     |   2 -
 t/t4013/diff.log_-SF_master_--max-count=1     |   7 -
 ...iff.log_-S_F_master => diff.log_-S_F_main} |   2 +-
 ...cc_-m_-p_master => diff.log_-c_-m_-p_main} |   2 +-
 ...-m_--raw_master => diff.log_-m_--raw_main} |   2 +-
 ..._--stat_master => diff.log_-m_--stat_main} |   2 +-
 ...ter => diff.log_-m_-p_--first-parent_main} |   2 +-
 ...f.log_-m_-p_master => diff.log_-m_-p_main} |   2 +-
 ...ff.log_-p_--diff-merges=first-parent_main} |   2 +-
 ...master => diff.log_-p_--first-parent_main} |   2 +-
 .../{diff.log_-p_master => diff.log_-p_main}  |   2 +-
 t/t4013/{diff.log_master => diff.log_main}    |   2 +-
 ...iff.noellipses-diff-tree_-c_--abbrev_main} |   2 +-
 ...> diff.noellipses-whatchanged_--root_main} |   2 +-
 ...r => diff.noellipses-whatchanged_-SF_main} |   2 +-
 ...aster => diff.noellipses-whatchanged_main} |   2 +-
 ...t_master => diff.show_--first-parent_main} |   2 +-
 ...{diff.show_-c_master => diff.show_-c_main} |   2 +-
 ...{diff.show_-m_master => diff.show_-m_main} |   2 +-
 t/t4013/{diff.show_master => diff.show_main}  |   2 +-
 ..._--patch-with-stat_--summary_main_--_dir_} |   2 +-
 ...> diff.whatchanged_--patch-with-stat_main} |   2 +-
 ...hatchanged_--patch-with-stat_main_--_dir_} |   2 +-
 ...oot_--cc_--patch-with-stat_--summary_main} |   2 +-
 ...d_--root_--patch-with-stat_--summary_main} |   2 +-
 ...whatchanged_--root_--patch-with-stat_main} |   2 +-
 ...-root_-c_--patch-with-stat_--summary_main} |   2 +-
 ...master => diff.whatchanged_--root_-p_main} |   2 +-
 ...ot_master => diff.whatchanged_--root_main} |   2 +-
 ...-p_master => diff.whatchanged_-SF_-p_main} |   2 +-
 ...d_-SF_master => diff.whatchanged_-SF_main} |   2 +-
 ...ged_-p_master => diff.whatchanged_-p_main} |   2 +-
 ...atchanged_master => diff.whatchanged_main} |   2 +-
 t/t9902-completion.sh                         |   6 +-
 t/test-lib.sh                                 |  15 +-
 109 files changed, 281 insertions(+), 253 deletions(-)
 rename t/t4013/{diff.diff-tree_--cc_--patch-with-stat_--summary_master => diff.diff-tree_--cc_--patch-with-stat_--summary_main} (86%)
 rename t/t4013/{diff.diff-tree_--cc_--patch-with-stat_master => diff.diff-tree_--cc_--patch-with-stat_main} (89%)
 rename t/t4013/{diff.diff-tree_--cc_--shortstat_master => diff.diff-tree_--cc_--shortstat_main} (65%)
 rename t/t4013/{diff.diff-tree_-c_--stat_--summary_master => diff.diff-tree_--cc_--stat_--summary_main} (71%)
 rename t/t4013/{diff.diff-tree_-c_--stat_master => diff.diff-tree_--cc_--stat_main} (76%)
 rename t/t4013/{diff.diff-tree_--cc_master => diff.diff-tree_--cc_main} (91%)
 rename t/t4013/{diff.diff-tree_-c_--abbrev_master => diff.diff-tree_-c_--abbrev_main} (83%)
 rename t/t4013/{diff.diff-tree_--cc_--stat_--summary_master => diff.diff-tree_-c_--stat_--summary_main} (70%)
 rename t/t4013/{diff.diff-tree_--cc_--stat_master => diff.diff-tree_-c_--stat_main} (75%)
 rename t/t4013/{diff.diff-tree_-c_master => diff.diff-tree_-c_main} (93%)
 rename t/t4013/{diff.diff-tree_-m_master => diff.diff-tree_-m_main} (96%)
 rename t/t4013/{diff.diff-tree_-p_-m_master => diff.diff-tree_-p_-m_main} (97%)
 create mode 100644 t/t4013/diff.diff-tree_-p_main
 delete mode 100644 t/t4013/diff.diff-tree_-p_master
 create mode 100644 t/t4013/diff.diff-tree_main
 delete mode 100644 t/t4013/diff.diff-tree_master
 create mode 100644 t/t4013/diff.diff_--dirstat_--cc_main~1_main
 delete mode 100644 t/t4013/diff.diff_--dirstat_--cc_master~1_master
 create mode 100644 t/t4013/diff.diff_--dirstat_main~1_main~2
 delete mode 100644 t/t4013/diff.diff_--dirstat_master~1_master~2
 rename t/t4013/{diff.diff_--line-prefix=abc_master_master^_side => diff.diff_--line-prefix=abc_main_main^_side} (87%)
 rename t/t4013/{diff.diff_master_master^_side => diff.diff_main_main^_side} (89%)
 rename t/t4013/{diff.format-patch_--attach_--stdout_initial..master => diff.format-patch_--attach_--stdout_initial..main} (98%)
 rename t/t4013/{diff.format-patch_--attach_--stdout_initial..master^ => diff.format-patch_--attach_--stdout_initial..main^} (97%)
 rename t/t4013/{diff.format-patch_--inline_--stdout_--numbered-files_initial..master => diff.format-patch_--inline_--stdout_--numbered-files_initial..main} (99%)
 rename t/t4013/{diff.format-patch_--inline_--stdout_--subject-prefix=TESTCASE_initial..master => diff.format-patch_--inline_--stdout_--subject-prefix=TESTCASE_initial..main} (99%)
 rename t/t4013/{diff.format-patch_--inline_--stdout_initial..master => diff.format-patch_--inline_--stdout_initial..main} (98%)
 rename t/t4013/{diff.format-patch_--inline_--stdout_initial..master^ => diff.format-patch_--inline_--stdout_initial..main^} (97%)
 rename t/t4013/{diff.format-patch_--inline_--stdout_initial..master^^ => diff.format-patch_--inline_--stdout_initial..main^^} (95%)
 rename t/t4013/{diff.format-patch_--stdout_--cover-letter_-n_initial..master^ => diff.format-patch_--stdout_--cover-letter_-n_initial..main^} (96%)
 rename t/t4013/{diff.format-patch_--stdout_--no-numbered_initial..master => diff.format-patch_--stdout_--no-numbered_initial..main} (97%)
 rename t/t4013/{diff.format-patch_--stdout_--numbered_initial..master => diff.format-patch_--stdout_--numbered_initial..main} (97%)
 rename t/t4013/{diff.format-patch_--stdout_initial..master => diff.format-patch_--stdout_initial..main} (97%)
 rename t/t4013/{diff.format-patch_--stdout_initial..master^ => diff.format-patch_--stdout_initial..main^} (96%)
 rename t/t4013/{diff.log_-c_-m_-p_master => diff.log_--cc_-m_-p_main} (99%)
 rename t/t4013/{diff.log_--diff-merges=first-parent_master => diff.log_--diff-merges=first-parent_main} (95%)
 rename t/t4013/{diff.log_--no-diff-merges_-p_--first-parent_master => diff.log_--diff-merges=off_-p_--first-parent_main} (95%)
 rename t/t4013/{diff.log_--first-parent_--diff-merges=off_-p_master => diff.log_--first-parent_--diff-merges=off_-p_main} (95%)
 rename t/t4013/{diff.log_--diff-merges=off_-p_--first-parent_master => diff.log_--no-diff-merges_-p_--first-parent_main} (95%)
 rename t/t4013/{diff.log_--patch-with-stat_--summary_master_--_dir_ => diff.log_--patch-with-stat_--summary_main_--_dir_} (96%)
 rename t/t4013/{diff.log_--patch-with-stat_master => diff.log_--patch-with-stat_main} (98%)
 rename t/t4013/{diff.log_--patch-with-stat_master_--_dir_ => diff.log_--patch-with-stat_main_--_dir_} (96%)
 rename t/t4013/{diff.log_--root_--cc_--patch-with-stat_--summary_master => diff.log_--root_--cc_--patch-with-stat_--summary_main} (98%)
 rename t/t4013/{diff.log_--root_--patch-with-stat_--summary_master => diff.log_--root_--patch-with-stat_--summary_main} (98%)
 rename t/t4013/{diff.log_--root_--patch-with-stat_master => diff.log_--root_--patch-with-stat_main} (98%)
 rename t/t4013/{diff.log_--root_-c_--patch-with-stat_--summary_master => diff.log_--root_-c_--patch-with-stat_--summary_main} (98%)
 rename t/t4013/{diff.log_--root_-p_master => diff.log_--root_-p_main} (98%)
 rename t/t4013/{diff.log_--root_master => diff.log_--root_main} (96%)
 rename t/t4013/{diff.log_-GF_-p_--pickaxe-all_master => diff.log_-GF_-p_--pickaxe-all_main} (90%)
 rename t/t4013/{diff.log_-GF_-p_master => diff.log_-GF_-p_main} (91%)
 rename t/t4013/{diff.log_-SF_master => diff.log_-GF_main} (86%)
 rename t/t4013/{diff.log_-IA_-IB_-I1_-I2_-p_master => diff.log_-IA_-IB_-I1_-I2_-p_main} (97%)
 rename t/t4013/{diff.log_-SF_-p_master => diff.log_-SF_-p_main} (91%)
 rename t/t4013/{diff.log_-GF_master => diff.log_-SF_main} (86%)
 create mode 100644 t/t4013/diff.log_-SF_main_--max-count=0
 rename t/t4013/{diff.log_-SF_master_--max-count=2 => diff.log_-SF_main_--max-count=1} (79%)
 create mode 100644 t/t4013/diff.log_-SF_main_--max-count=2
 delete mode 100644 t/t4013/diff.log_-SF_master_--max-count=0
 delete mode 100644 t/t4013/diff.log_-SF_master_--max-count=1
 rename t/t4013/{diff.log_-S_F_master => diff.log_-S_F_main} (86%)
 rename t/t4013/{diff.log_--cc_-m_-p_master => diff.log_-c_-m_-p_main} (99%)
 rename t/t4013/{diff.log_-m_--raw_master => diff.log_-m_--raw_main} (98%)
 rename t/t4013/{diff.log_-m_--stat_master => diff.log_-m_--stat_main} (98%)
 rename t/t4013/{diff.log_-m_-p_--first-parent_master => diff.log_-m_-p_--first-parent_main} (97%)
 rename t/t4013/{diff.log_-m_-p_master => diff.log_-m_-p_main} (99%)
 rename t/t4013/{diff.log_-p_--diff-merges=first-parent_master => diff.log_-p_--diff-merges=first-parent_main} (97%)
 rename t/t4013/{diff.log_-p_--first-parent_master => diff.log_-p_--first-parent_main} (97%)
 rename t/t4013/{diff.log_-p_master => diff.log_-p_main} (98%)
 rename t/t4013/{diff.log_master => diff.log_main} (97%)
 rename t/t4013/{diff.noellipses-diff-tree_-c_--abbrev_master => diff.noellipses-diff-tree_-c_--abbrev_main} (81%)
 rename t/t4013/{diff.noellipses-whatchanged_--root_master => diff.noellipses-whatchanged_--root_main} (96%)
 rename t/t4013/{diff.noellipses-whatchanged_-SF_master => diff.noellipses-whatchanged_-SF_main} (86%)
 rename t/t4013/{diff.noellipses-whatchanged_master => diff.noellipses-whatchanged_main} (96%)
 rename t/t4013/{diff.show_--first-parent_master => diff.show_--first-parent_main} (92%)
 rename t/t4013/{diff.show_-c_master => diff.show_-c_main} (95%)
 rename t/t4013/{diff.show_-m_master => diff.show_-m_main} (98%)
 rename t/t4013/{diff.show_master => diff.show_main} (96%)
 rename t/t4013/{diff.whatchanged_--patch-with-stat_--summary_master_--_dir_ => diff.whatchanged_--patch-with-stat_--summary_main_--_dir_} (94%)
 rename t/t4013/{diff.whatchanged_--patch-with-stat_master => diff.whatchanged_--patch-with-stat_main} (97%)
 rename t/t4013/{diff.whatchanged_--patch-with-stat_master_--_dir_ => diff.whatchanged_--patch-with-stat_main_--_dir_} (94%)
 rename t/t4013/{diff.whatchanged_--root_--cc_--patch-with-stat_--summary_master => diff.whatchanged_--root_--cc_--patch-with-stat_--summary_main} (97%)
 rename t/t4013/{diff.whatchanged_--root_--patch-with-stat_--summary_master => diff.whatchanged_--root_--patch-with-stat_--summary_main} (97%)
 rename t/t4013/{diff.whatchanged_--root_--patch-with-stat_master => diff.whatchanged_--root_--patch-with-stat_main} (97%)
 rename t/t4013/{diff.whatchanged_--root_-c_--patch-with-stat_--summary_master => diff.whatchanged_--root_-c_--patch-with-stat_--summary_main} (97%)
 rename t/t4013/{diff.whatchanged_--root_-p_master => diff.whatchanged_--root_-p_main} (98%)
 rename t/t4013/{diff.whatchanged_--root_master => diff.whatchanged_--root_main} (97%)
 rename t/t4013/{diff.whatchanged_-SF_-p_master => diff.whatchanged_-SF_-p_main} (89%)
 rename t/t4013/{diff.whatchanged_-SF_master => diff.whatchanged_-SF_main} (86%)
 rename t/t4013/{diff.whatchanged_-p_master => diff.whatchanged_-p_main} (98%)
 rename t/t4013/{diff.whatchanged_master => diff.whatchanged_main} (97%)

-- 
2.49.0.897.gfad3eb7d210





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