The list of conflicted paths shown in the editor while concluding a
conflicted merge was shown above the scissors line when the
clean-up mode is set to "scissors", even though it was commented
out just like the list of updated paths and other information to
help the user explain the merge better.
* dl/merge-cleanup-scissors-fix:
cherry-pick/revert: add scissors line on merge conflict
sequencer.c: save and restore cleanup mode
merge: add scissors line on merge conflict
merge: cleanup messages like commit
parse-options.h: extract common --cleanup option
commit: extract cleanup_mode functions to sequencer
t7502: clean up style
t7604: clean up style
t3507: clean up style
t7600: clean up style
"git cherry-pick" run with the "-x" or the "--signoff" option used
to (and more importantly, ought to) clean up the commit log message
with the --cleanup=space option by default, but this has been
broken since late 2017. This has been fixed.
* pw/sequencer-cleanup-with-signoff-x-fix:
sequencer: fix cleanup with --signoff and -x
The scripted version of "git rebase -i" wrote and rewrote the todo
list many times during a single step of its operation, and the
recent C-rewrite made a faithful conversion of the logic to C. The
implementation has been updated to carry necessary information
around in-core to avoid rewriting the same file over and over
unnecessarily.
* ag/sequencer-reduce-rewriting-todo:
rebase--interactive: move transform_todo_file()
sequencer: use edit_todo_list() in complete_action()
rebase-interactive: rewrite edit_todo_list() to handle the initial edit
rebase-interactive: append_todo_help() changes
rebase-interactive: use todo_list_write_to_file() in edit_todo_list()
sequencer: refactor skip_unnecessary_picks() to work on a todo_list
rebase--interactive: move rearrange_squash_in_todo_file()
rebase--interactive: move sequencer_add_exec_commands()
sequencer: change complete_action() to use the refactored functions
sequencer: make sequencer_make_script() write its script to a strbuf
sequencer: refactor rearrange_squash() to work on a todo_list
sequencer: refactor sequencer_add_exec_commands() to work on a todo_list
sequencer: refactor check_todo_list() to work on a todo_list
sequencer: introduce todo_list_write_to_file()
sequencer: refactor transform_todos() to work on a todo_list
sequencer: remove the 'arg' field from todo_item
sequencer: make the todo_list structure public
sequencer: changes in parse_insn_buffer()
Fix a bug where the scissors line is placed after the Conflicts:
section, in the case where a merge conflict occurs and
commit.cleanup = scissors.
Helped-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Before commit 356ee4659b ("sequencer: try to commit without forking 'git
commit'", 2017-11-24) when --signoff or -x were given on the command
line the commit message was cleaned up with --cleanup=space or
commit.cleanup if it was set. Unfortunately this behavior was lost when
I implemented committing without forking. Fix this and add some tests to
catch future regressions.
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
As transform_todo_file() is only needed inside of
rebase--interactive.c for `rebase -p', it is moved there from
sequencer.c.
The parameter r (repository) is dropped along the way.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
edit_todo_list() is changed to work on a todo_list, and to handle the
initial edition of the todo list (ie. making a backup of the todo
list).
It does not check for dropped commits yet, as todo_list_check() does not
take the commits that have already been processed by the rebase (ie. the
todo list is edited in the middle of a rebase session).
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Just like complete_action(), edit_todo_list() used a
function (transform_todo_file()) that read the todo list from the disk
and wrote it back, resulting in useless disk accesses.
This changes edit_todo_list() to call directly todo_list_write_to_file()
instead.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
As rearrange_squash_in_todo_file() is only needed inside of
rebase--interactive.c for `rebase -p', it is moved there from
sequencer.c.
The parameter r (repository) is dropped along the way, and the error
handling is slightly improved.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
As sequencer_add_exec_commands() is only needed inside of
rebase--interactive.c for `rebase -p', it is moved there from
sequencer.c.
The parameter r (repository) is dropped along the way.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
complete_action() used functions that read the todo-list file, made some
changes to it, and wrote it back to the disk.
The previous commits were dedicated to separate the part that deals with
the file from the actual logic of these functions. Now that this is
done, we can call directly the "logic" functions to avoid useless file
access.
The parsing of the list has to be done by the caller. If the buffer of
the todo list provided by the caller is empty, a `noop' command is
directly added to the todo list, without touching the buffer.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This makes sequencer_make_script() write its script to a strbuf (ie. the
buffer of a todo_list) instead of a FILE. This reduce the amount of
read/write made by rebase interactive.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This refactors rearrange_squash() to work on a todo_list to avoid
redundant reads and writes. The function is renamed
todo_list_rearrange_squash().
The old version created a new buffer, which was directly written to the
disk. This new version creates a new item list by just copying items
from the old item list, without creating a new buffer. This eliminates
the need to reparse the todo list, but this also means its buffer cannot
be directly written to the disk.
As rebase -p still need to check the todo list from the disk, a new
function is introduced, rearrange_squash_in_todo_file().
complete_action() still uses rearrange_squash_in_todo_file() for now.
This will be changed in a future commit.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This refactors sequencer_add_exec_commands() to work on a todo_list to
avoid redundant reads and writes to the disk.
Instead of inserting the `exec' commands between the other commands and
re-parsing the buffer at the end, they are appended to the buffer once,
and a new list of items is created. Items from the old list are copied
across and new `exec' items are appended when necessary. This
eliminates the need to reparse the buffer, but this also means we have
to use todo_list_write_to_disk() to write the file.
todo_list_add_exec_commands() and sequencer_add_exec_commands() are
modified to take a string list instead of a string -- one item for each
command. This makes it easier to insert a new command to the todo list
for each command to execute.
sequencer_add_exec_commands() still reads the todo list from the disk,
as it is needed by rebase -p.
complete_action() still uses sequencer_add_exec_commands() for now.
This will be changed in a future commit.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Commit d0aaa46fd3 ("commit: move empty message checks to libgit",
2017-11-10) removes the last use of 'sign_off_header' outside of
the "sequencer.c" source file. Remove the extern declaration from
the header file and mark the definition of the symbol with the
static keyword.
Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The assumption to work on the single "in-core index" instance has
been reduced from the library-ish part of the codebase.
* nd/the-index-final:
cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch
read-cache.c: remove the_* from index_has_changes()
merge-recursive.c: remove implicit dependency on the_repository
merge-recursive.c: remove implicit dependency on the_index
sha1-name.c: remove implicit dependency on the_index
read-cache.c: replace update_index_if_able with repo_&
read-cache.c: kill read_index()
checkout: avoid the_index when possible
repository.c: replace hold_locked_index() with repo_hold_locked_index()
notes-utils.c: remove the_repository references
grep: use grep_opt->repo instead of explict repo argument
"git rebase --merge" as been reimplemented by reusing the internal
machinery used for "git rebase -i".
* en/rebase-merge-on-sequencer:
rebase: implement --merge via the interactive machinery
rebase: define linearization ordering and enforce it
git-legacy-rebase: simplify unnecessary triply-nested if
git-rebase, sequencer: extend --quiet option for the interactive machinery
am, rebase--merge: do not overlook --skip'ed commits with post-rewrite
t5407: add a test demonstrating how interactive handles --skip differently
rebase: fix incompatible options error message
rebase: make builtin and legacy script error messages the same
"git rebase -i" learned to re-execute a command given with 'exec'
to run after it failed the last time.
* js/rebase-i-redo-exec:
rebase: introduce a shortcut for --reschedule-failed-exec
rebase: add a config option to default to --reschedule-failed-exec
rebase: introduce --reschedule-failed-exec
This refactors check_todo_list() to work on a todo_list to avoid
redundant reads and writes to the disk. The function is renamed
todo_list_check(). The parsing of the two todo lists is left to the
caller.
As rebase -p still need to check the todo list from the disk, a new
function is introduced, check_todo_list_from_file(). It reads the file
from the disk, parses it, pass the todo_list to todo_list_check(), and
writes it back to the disk.
As get_missing_commit_check_level() and the enum
missing_commit_check_level are no longer needed inside of sequencer.c,
they are moved to rebase-interactive.c, and made static again.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This introduces a new function to recreate the text of a todo list from
its commands and write it to a file. This will be useful as the next
few commits will change the use of the buffer in struct todo_list so it
will no longer be a mirror of the file on disk.
This functionality already exists in todo_list_transform(), but this
function was made to replace the buffer of a todo list, which is not
what we want here. Thus, the part of todo_list_transform() that
replaces the buffer is dropped, and the function is renamed
todo_list_to_strbuf(). It is called by todo_list_write_to_file() to
fill the buffer to write to the disk.
todo_list_write_to_file() can also take care of appending the help text
to the buffer before writing it to the disk, or to write only the first
n items of the list. This feature will be used by
skip_unnecessary_picks(), which has to write done commands in a file.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This refactors transform_todos() to work on a todo_list. The function
is renamed todo_list_transform().
As rebase -p still need to check the todo list from the disk, a new
function is introduced, transform_todo_file(). It is still used by
complete_action() and edit_todo_list() for now, but they will be
replaced in a future commit.
todo_list_transform() is not a static function, because it will be used
by edit_todo_list() from rebase-interactive.c in a future commit.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The 'arg' field of todo_item used to store the address of the first byte
of the parameter of a command in a todo list. It was associated with
the length of the parameter (the 'arg_len' field).
This replaces the 'arg' field by 'arg_offset'. This new field does not
store the address of the parameter, but the position of the first
character of the parameter in the buffer. todo_item_get_arg() is added
to return the address of the parameter of an item.
This will prevent todo_list_add_exec_commands() from having to do awful
pointer arithmetics when growing the todo list buffer.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This makes the structures todo_list and todo_item, and the functions
todo_list_release() and parse_insn_buffer(), accessible outside of
sequencer.c.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
While 'quiet' and 'interactive' may sound like antonyms, the interactive
machinery actually has logic that implements several
interactive_rebase=implied cases (--exec, --keep-empty, --rebase-merges)
which won't pop up an editor. The rewrite of interactive rebase in C
added a quiet option, though it only turns stats off. Since we want to
make the interactive machinery also take over for git-rebase--merge, it
should fully implement the --quiet option.
git-rebase--interactive was already somewhat quieter than
git-rebase--merge and git-rebase--am, possibly because cherry-pick has
just traditionally been quieter. As such, we only drop a few
informational messages -- "Rebasing (n/m)" and "Successfully rebased..."
Also, for simplicity, remove the differences in how quiet and verbose
options were recorded. Having one be signalled by the presence of a
"verbose" file in the state_dir, while the other was signalled by the
contents of a "quiet" file was just weirdly inconsistent. (This
inconsistency pre-dated the rewrite into C.) Make them consistent by
having them both key off the presence of the file.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
A common use case for the `--exec` option is to verify that each commit
in a topic branch compiles cleanly, via `git rebase -x make <base>`.
However, when an `exec` in such a rebase fails, it is not re-scheduled,
which in this instance is not particularly helpful.
Let's offer a flag to reschedule failed `exec` commands.
Based on an idea by Paul Morelle.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Unify code to read the author-script used in "git am" and the
commands that use the sequencer machinery, e.g. "git rebase -i".
* pw/am-rebase-read-author-script:
sequencer: use read_author_script()
add read_author_script() to libgit
am: rename read_author_script()
am: improve author-script error reporting
am: don't die in read_author_script()
Note that the_hash_algo stays, even if we can easily replace it with
repo->hash_algo. My reason is I still believe tying hash_algo to a
struct repository is a wrong move. But if I'm wrong, we can always go
for another round of conversion.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Since we're going to pass 'struct repository *' around most of the
time instead of 'struct index_state *' because most sequencer.c
operations need more than just the index, the_repository is replaced
as well in the functions that now take 'struct repository
*'. the_repository is still present in this file, but total clean up
will be done later. It's not the main focus of this patch.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Rewrite of the remaining "rebase -i" machinery in C.
* ag/rebase-i-in-c:
rebase -i: move rebase--helper modes to rebase--interactive
rebase -i: remove git-rebase--interactive.sh
rebase--interactive2: rewrite the submodes of interactive rebase in C
rebase -i: implement the main part of interactive rebase as a builtin
rebase -i: rewrite init_basic_state() in C
rebase -i: rewrite write_basic_state() in C
rebase -i: rewrite the rest of init_revisions_and_shortrevisions() in C
rebase -i: implement the logic to initialize $revisions in C
rebase -i: remove unused modes and functions
rebase -i: rewrite complete_action() in C
t3404: todo list with commented-out commands only aborts
sequencer: change the way skip_unnecessary_picks() returns its result
sequencer: refactor append_todo_help() to write its message to a buffer
rebase -i: rewrite checkout_onto() in C
rebase -i: rewrite setup_reflog_action() in C
sequencer: add a new function to silence a command, except if it fails
rebase -i: rewrite the edit-todo functionality in C
editor: add a function to launch the sequence editor
rebase -i: rewrite append_todo_help() in C
sequencer: make three functions and an enum from sequencer.c public
Add read_author_script() to sequencer.c based on the implementation in
builtin/am.c and update read_am_author_script() to use
read_author_script(). The sequencer code that reads the author script
will be updated in the next commit.
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
"git interpret-trailers" and its underlying machinery had a buggy
code that attempted to ignore patch text after commit log message,
which triggered in various codepaths that will always get the log
message alone and never get such an input.
* jk/trailer-fixes:
append_signoff: use size_t for string offsets
sequencer: ignore "---" divider when parsing trailers
pretty, ref-filter: format %(trailers) with no_divider option
interpret-trailers: allow suppressing "---" divider
interpret-trailers: tighten check for "---" patch boundary
trailer: pass process_trailer_opts to trailer_info_get()
trailer: use size_t for iterating trailer list
trailer: use size_t for string offsets
This rewrites write_basic_state() from git-rebase.sh in C. This is the
first step in the conversion of init_basic_state(), hence the mode in
rebase--helper.c is called INIT_BASIC_STATE. init_basic_state() will be
converted in the next commit.
The part of read_strategy_opts() that parses the stategy options is
moved to a new function to allow its use in rebase--helper.c.
Finally, the call to write_basic_state() is removed from
git-rebase--interactive.sh, replaced by a call to `--init-basic-state`.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This removes the modes `--skip-unnecessary-picks`, `--append-todo-help`,
and `--checkout-onto` from rebase--helper.c, the functions of
git-rebase--interactive.sh that were rendered useless by the rewrite of
complete_action(), and append_todo_help_to_file() from
rebase-interactive.c.
skip_unnecessary_picks() and checkout_onto() becomes static, as they are
only used inside of the sequencer.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This rewrites complete_action() from shell to C.
A new mode is added to rebase--helper (`--complete-action`), as well as
a new flag (`--autosquash`).
Finally, complete_action() is stripped from git-rebase--interactive.sh.
The original complete_action() would return the code 2 when the todo
list contained no actions. This was a special case for rebase -i and
-p; git-rebase.sh would then apply the autostash, delete the state
directory, and die with the message "Nothing to do". This cleanup is
rewritten in C instead of returning 2. As rebase -i no longer returns
2, the comment describing this behaviour in git-rebase.sh is updated to
reflect this change.
The message "Nothing to do" is now printed with error(), and so becomes
"error: nothing to do". Some tests in t3404 check this value, so they
are updated to fit this change.
The first check might seem useless as we write "noop" to the todo list
if it is empty. Actually, the todo list might contain commented
commands (ie. empty commits). In this case, complete_action() won’t
write "noop", and will abort without starting the editor.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The append_signoff() function takes an "int" to specify the
number of bytes to ignore. Most callers just pass 0, and the
remainder use ignore_non_trailer() to skip over cruft.
That function also returns an int, and uses them internally.
On systems where size_t is larger than an int (i.e., most
64-bit systems), dealing with a ridiculously large commit
message could end up overflowing an int, producing
surprising results (e.g., returning a negative offset, which
would cause us to look outside the original string).
Let's consistently use size_t for these offsets through this
whole stack. As a bonus, this makes the meaning of
"ignore_footer" as an offset (and not a boolean) more clear.
But while we're here, let's also document the interface.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
I looped over the toplevel header files, creating a temporary two-line C
program for each consisting of
#include "git-compat-util.h"
#include $HEADER
This patch is the result of manually fixing errors in compiling those
tiny programs.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Instead of skip_unnecessary_picks() printing its result to stdout, it
returns it into a struct object_id, as the rewrite of complete_action()
(to come in the next commit) will need it.
rebase--helper then is modified to fit this change.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This rewrites checkout_onto() from shell to C.
A new command (“checkout-onto”) is added to rebase--helper.c. The shell
version is then stripped.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This rewrites (the misnamed) setup_reflog_action() from shell to C. The
new version is called prepare_branch_to_be_rebased().
A new command is added to rebase--helper.c, “checkout-base”, as well as
a new flag, “verbose”, to avoid silencing the output of the checkout
operation called by checkout_base_commit().
The function `run_git_checkout()` will also be used in the next commit,
therefore its code is not part of `checkout_base_commit()`.
The shell version is then stripped in favour of a call to the helper.
As $GIT_REFLOG_ACTION is no longer set at the first call of
checkout_onto(), a call to comment_for_reflog() is added at the
beginning of this function.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This makes rebase_path_todo(), get_missing_commit_check_level(),
write_message() and the enum check_level accessible outside sequencer.c,
renames check_level to missing_commit_check_level, and prefixes its
value names by MISSING_COMMIT_ to avoid namespace pollution.
This function and this enum will eventually be moved to
rebase-interactive.c and become static again, so no special attention
was given to the naming.
This will be needed for the rewrite of append_todo_help() from shell to
C, as it will be in a new library source file, rebase-interactive.c.
Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The implementation of "git rebase -i --root" has been updated to use
the sequencer machinery more.
* js/sequencer-and-root-commits:
rebase --rebase-merges: root commits can be cousins, too
rebase --rebase-merges: a "merge" into a new root is a fast-forward
sequencer: allow introducing new root commits
rebase -i --root: let the sequencer handle even the initial part
sequencer: learn about the special "fake root commit" handling
sequencer: extract helper to update active_cache_tree
"git rebase" learned "--rebase-merges" to transplant the whole
topology of commit graph elsewhere.
* js/rebase-recreate-merge:
rebase -i --rebase-merges: add a section to the man page
rebase -i: introduce --rebase-merges=[no-]rebase-cousins
pull: accept --rebase=merges to recreate the branch topology
rebase --rebase-merges: avoid "empty merges"
sequencer: handle post-rewrite for merge commands
sequencer: make refs generated by the `label` command worktree-local
rebase --rebase-merges: add test for --keep-empty
rebase: introduce the --rebase-merges option
rebase-helper --make-script: introduce a flag to rebase merges
sequencer: fast-forward `merge` commands, if possible
sequencer: introduce the `merge` command
sequencer: introduce new commands to reset the revision
git-rebase--interactive: clarify arguments
sequencer: offer helpful advice when a command was rescheduled
sequencer: refactor how original todo list lines are accessed
sequencer: make rearrange_squash() a bit more obvious
sequencer: avoid using errno clobbered by rollback_lock_file()
When an interactive rebase wants to recreate a root commit, it
- first creates a new, empty root commit,
- checks it out,
- converts the next `pick` command so that it amends the empty root
commit
Introduce support in the sequencer to handle such an empty root commit,
by looking for the file <GIT_DIR>/rebase-merge/squash-onto; if it exists
and contains a commit name, the sequencer will compare the HEAD to said
root commit, and if identical, a new root commit will be created.
While converting scripted code into proper, portable C, we also do away
with the old "amend with an empty commit message, then cherry-pick
without committing, then amend again" dance and replace it with code
that uses the internal API properly to do exactly what we want: create a
new root commit.
To keep the implementation simple, we always spawn `git commit` to create
new root commits.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We previously relied on the localized versions of
# This is a combination of <N> commits
(which we write into the commit messages during fixup/squash chains)
to contain <N> encoded in ASCII.
This is not true in general, and certainly not true when compiled with
GETTEXT_POISON=TryToKillMe, as demonstrated by the regression test we
just introduced in t3418.
So let's decouple keeping track of the count from the (localized) commit
messages by introducing a new file called 'current-fixups' that keeps
track of the current fixup/squash chain. This file contains a bit more
than just the count (it contains a list of "fixup <commit>"/"squash
<commit>" lines). This is done on purpose, as it will come in handy for
a fix for the bug where `git rebase --skip` on a final fixup/squash will
leave the commit message in limbo.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When running `git rebase --rebase-merges` non-interactively with an
ancestor of HEAD as <upstream> (or leaving the todo list unmodified),
we would ideally recreate the exact same commits as before the rebase.
However, if there are commits in the commit range <upstream>.. that do not
have <upstream> as direct ancestor (i.e. if `git log <upstream>..` would
show commits that are omitted by `git log --ancestry-path <upstream>..`),
this is currently not the case: we would turn them into commits that have
<upstream> as direct ancestor.
Let's illustrate that with a diagram:
C
/ \
A - B - E - F
\ /
D
Currently, after running `git rebase -i --rebase-merges B`, the new branch
structure would be (pay particular attention to the commit `D`):
--- C' --
/ \
A - B ------ E' - F'
\ /
D'
This is not really preserving the branch topology from before! The
reason is that the commit `D` does not have `B` as ancestor, and
therefore it gets rebased onto `B`.
This is unintuitive behavior. Even worse, when recreating branch
structure, most use cases would appear to want cousins *not* to be
rebased onto the new base commit. For example, Git for Windows (the
heaviest user of the Git garden shears, which served as the blueprint
for --rebase-merges) frequently merges branches from `next` early, and
these branches certainly do *not* want to be rebased. In the example
above, the desired outcome would look like this:
--- C' --
/ \
A - B ------ E' - F'
\ /
-- D' --
Let's introduce the term "cousins" for such commits ("D" in the
example), and let's not rebase them by default. For hypothetical
use cases where cousins *do* need to be rebased, `git rebase
--rebase=merges=rebase-cousins` needs to be used.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The sequencer just learned new commands intended to recreate branch
structure (similar in spirit to --preserve-merges, but with a
substantially less-broken design).
Let's allow the rebase--helper to generate todo lists making use of
these commands, triggered by the new --rebase-merges option. For a
commit topology like this (where the HEAD points to C):
- A - B - C
\ /
D
the generated todo list would look like this:
# branch D
pick 0123 A
label branch-point
pick 1234 D
label D
reset branch-point
pick 2345 B
merge -C 3456 D # C
To keep things simple, we first only implement support for merge commits
with exactly two parents, leaving support for octopus merges to a later
patch series.
All merge-rebasing todo lists start with a hard-coded `label onto` line.
This makes it convenient to refer later on to the revision onto which
everything is rebased, e.g. as starting point for branches other than
the very first one.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
