Convert two static functions to use struct object_id and parse_oid_hex,
instead of relying on harcoded 20 and 40-based constants.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Since the only caller of this function already uses struct object_id,
update get_tree_entry_follow_symlinks to use it in parameters and
internally.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Use the_hash_algo to look up the length of our current hash instead of
hard-coding the value 20.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Instead of using hard-coded instances of the constant 20, use
the_hash_algo to look up the correct constant.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Instead of using hard-coded instances of the constant 20, use
the_hash_algo to look up the correct constant.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
There are several instances of the constant 20 and 20-based values in
the packfile code. Abstract away dependence on SHA-1 by using the
values from the_hash_algo instead.
Use unsigned values for temporary constants to provide the compiler with
more information about what kinds of values it should expect.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Convert find_pack_entry and the static function fill_pack_entry to take
pointers to struct object_id.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Convert the various functions for freshening objects and
has_loose_object_nonlocal to use struct object_id.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Convert this function to take a pointer to struct object_id and rename
it has_object_pack for consistency with has_object_file.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The sha1 member in struct pack_entry is unused except for one instance
in which we store a value in it. Since nobody ever reads this value,
don't bother to compute it and remove the member from struct pack_entry.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The tree member of struct object_context is unused except in one place
where we write to it. Since there are no users of this member, remove
it.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The head member of struct pack_info is completely unused and the
nr_heads member is used only in one place, which is an assignment. This
member was last usefully used in 3e15c67c90 (server-info: throw away T
computation as well, 2005-12-04).
Since this structure member is not useful, remove it.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In various places throughout the codebase, we need to read data into a
struct object_id from a pack or other unsigned char buffer. Add an
inline function that does this based on the current hash algorithm in
use, and use it in several places.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The semantic patch 'contrib/coccinelle/commit.cocci' added in
2e27bd7731 (treewide: replace maybe_tree with accessor methods,
2018-04-06) is supposed to "ensure that all references to the
'maybe_tree' member of struct commit are either mutations or accesses
through get_commit_tree()". So get_commit_tree() clearly must be able
to directly access the 'maybe_tree' member, and 'commit.cocci' has a
bit of a roundabout workaround to ensure that get_commit_tree()'s
direct access in its return statement is not transformed: after all
references to 'maybe_tree' have been transformed to a call to
get_commit_tree(), including the reference in get_commit_tree()
itself, the last rule transforms back a 'return get_commit_tree()'
statement, back then found only in get_commit_tree() itself, to a
direct access.
Unfortunately, already the very next commit shows that this workaround
is insufficient: 7b8a21dba1 (commit-graph: lazy-load trees for
commits, 2018-04-06) extends get_commit_tree() with a condition
directly accessing the 'maybe_tree' member, and Coccinelle with
'commit.cocci' promptly detects it and suggests a transformation to
avoid it. This transformation is clearly wrong, because calling
get_commit_tree() to access 'maybe_tree' _in_ get_commit_tree() would
obviously lead to recursion. Furthermore, the same commit added
another, more specialized getter function get_commit_tree_in_graph(),
whose legitimate direct access to 'maybe_tree' triggers a similar
wrong transformation suggestion.
Exclude both of these getter functions from the general rule in
'commit.cocci' that matches their direct accesses to 'maybe_tree'.
Also exclude load_tree_for_commit(), which, as static helper funcion
of get_commit_tree_in_graph(), has legitimate direct access to
'maybe_tree' as well.
The last rule transforming back 'return get_commit_tree()' statements
to direct accesses thus became unnecessary, remove it.
Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Acked-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When formatting a series of patches using --attach and --cover-letter,
the cover letter lacks the closing MIME boundary, violating RFC 2046.
Certain clients, such as Thunderbird, discard the message body in such a
case.
Since the cover letter is just one part and sending it as
multipart/mixed is not very useful, always emit it as text/plain,
avoiding the boundary problem altogether.
Reported-by: Patrick Hemmer <git@stormcloud9.net>
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Currently, all callers of unpack_trees() set o->src_index == o->dst_index.
The code in unpack_trees() does not correctly handle them being different.
There are two separate issues:
First, there is the possibility of memory corruption. Since
unpack_trees() creates a temporary index in o->result and then discards
o->dst_index and overwrites it with o->result, in the special case that
o->src_index == o->dst_index, it is safe to just reuse o->src_index's
split_index for o->result. However, when src and dst are different,
reusing o->src_index's split_index for o->result will cause the
split_index to be shared. If either index then has entries replaced or
removed, it will result in the other index referring to free()'d memory.
Second, we can drop the index extensions. Previously, we were moving
index extensions from o->dst_index to o->result. Since o->src_index is
the one that will have the necessary extensions (o->dst_index is likely to
be a new index temporary index created to store the results), we should be
moving the index extensions from there.
Signed-off-by: Elijah Newren <newren@gmail.com>
Acked-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
On HFS (which is the default Mac filesystem prior to High Sierra),
unicode names are "decomposed" before recording.
On APFS, which appears to be the new default filesystem in Mac OS High
Sierra, filenames are recorded as specified by the user.
APFS continues to allow the user to access it via any name
that normalizes to the same thing.
This difference causes t0050-filesystem.sh to fail two tests.
Improve the test for a NFD/NFC in test-lib.sh:
Test if the same file can be reached in pre- and decomposed unicode.
Reported-By: Elijah Newren <newren@gmail.com>
Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Tested-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
During a series of fixup/squash commands, the interactive rebase builds
up a commit message with comments. This will be presented to the user in
the editor if at least one of those commands was a `squash`.
In any case, the commit message will be cleaned up eventually, removing
all those intermediate comments, in the final step of such a
fixup/squash chain.
However, if the last fixup/squash command in such a chain fails with
merge conflicts, and if the user then decides to skip it (or resolve it
to a clean worktree and then continue the rebase), the current code
fails to clean up the commit message.
This commit fixes that behavior.
The fix is quite a bit more involved than meets the eye because it is
not only about the question whether we are `git rebase --skip`ing a
fixup or squash. It is also about removing the skipped fixup/squash's
commit message from the accumulated commit message. And it is also about
the question whether we should let the user edit the final commit
message or not ("Was there a squash in the chain *that was not
skipped*?").
For example, in this case we will want to fix the commit message, but
not open it in an editor:
pick <- succeeds
fixup <- succeeds
squash <- fails, will be skipped
This is where the newly-introduced `current-fixups` file comes in real
handy. A quick look and we can determine whether there was a non-skipped
squash. We only need to make sure to keep it up to date with respect to
skipped fixup/squash commands. As a bonus, we can even avoid committing
unnecessarily, e.g. when there was only one fixup, and it failed, and
was skipped.
To fix only the bug where the final commit message was not cleaned up
properly, but without fixing the rest, would have been more complicated
than fixing it all in one go, hence this commit lumps together more than
a single concern.
For the same reason, this commit also adds a bit more to the existing
test case for the regression we just fixed.
The diff is best viewed with --color-moved.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Previously, we only called run_git_commit() without EDIT_MSG when we also
passed in a default message.
However, an upcoming caller will want to commit without EDIT_MSG and
*without* a default message: to clean up fixup/squash comments in HEAD's
commit message.
Let's prepare for that.
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 multiple fixup/squash commands are processed and the last one
causes merge conflicts and is skipped, we leave the "This is a
combination of ..." comments in the commit message.
Noticed by Eric Sunshine.
This regression test also demonstrates that we rely on the localized
version of
# This is a combination of <number> commits
to contain the <number> in ASCII, which breaks under GETTEXT_POISON.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The functionality is now implemented as `git replace
--convert-graft-file`.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
It is tempting to do away with commit_graft altogether (in the long
haul), now that grafts are deprecated.
However, the shallow feature needs a couple of things that the replace
refs cannot fulfill. Let's point that out in the documentation.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Now that grafts are deprecated, we should start to assume that readers
have no idea what grafts are. So it makes more sense to make the
description of the "shallow" feature stand on its own.
Suggested-by: Eric Sunshine <sunshine@sunshineco.com>
Helped-by: Junio Hamano <gitster@pobox.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The graft file is deprecated now, so let's use replace refs in the example
in filter-branch's man page instead.
Suggested-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The grafts feature was a convenient way to "stitch together" ancient
history to the fresh start of linux.git.
Its implementation is, however, not up to Git's standards, as there are
too many ways where it can lead to surprising and unwelcome behavior.
For example, when pushing from a repository with active grafts, it is
possible to miss commits that have been "grafted out", resulting in a
broken state on the other side.
Also, the grafts feature is limited to "rewriting" commits' list of
parents, it cannot replace anything else.
The much younger feature implemented as `git replace` set out to remedy
those limitations and dangerous bugs.
Seeing as `git replace` is pretty mature by now (since 4228e8bc98
(replace: add --graft option, 2014-07-19) it can perform the graft
file's duties), it is time to deprecate support for the graft file, and
to retire it eventually.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Reviewed-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The proof, as the saying goes, lies in the pudding. So here is a
regression test that not only demonstrates what the option is supposed to
accomplish, but also demonstrates that it does accomplish it.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This option is intended to help with the transition away from the
now-deprecated graft file.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When converting all grafts in a graft file to replace refs, and one of
them happens to leave the original commit's parents unchanged, we do not
want to error out. Instead, we would like to issue a warning.
Prepare the create_graft() function for such a use case by adding a
`gentle` parameter. If set, we do not return an error when the replace ref
is unchanged, but a mere warning.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
File this away as yet another patch in the "libification" category.
As with all useful functions, in the next commit we want to use
create_graft() from a higher-level function where it would be
inconvenient if the called function simply die()s: if there is a
problem, we want to let the user know how to proceed, and the callee
simply has no way of knowing what to say.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
While working on the --convert-graft-file test, I missed that I was
relying on the GPG prereq, by using output of test cases that were only
run under that prereq.
For debugging, it was really convenient to force that prereq to be
unmet, but there was no easy way to do that. So I came up with a way,
and this patch reflects the cleaned-up version of that way.
For convenience, the following two methods are now supported ways to
pretend that a prereq is not met:
test_set_prereq !GPG
and
test_unset_prereq GPG
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Currently 'git worktree add <path>' creates a new branch named after the
basename of the path by default. If a branch with that name already
exists, the command refuses to do anything, unless the '--force' option
is given.
However we can do a little better than that, and check the branch out if
it is not checked out anywhere else. This will help users who just want
to check an existing branch out into a new worktree, and save a few
keystrokes.
As the current behaviour is to simply 'die()' when a branch with the name
of the basename of the path already exists, there are no backwards
compatibility worries here.
We will still 'die()' if the branch is checked out in another worktree,
unless the --force flag is passed.
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Factor out a dwim_branch function, which takes care of the dwim'ery in
'git worktree add <path>'. It's not too much code currently, but we're
adding a new kind of dwim in a subsequent patch, at which point it makes
more sense to have it as a separate function.
Factor it out now to reduce the patch noise in the next patch.
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Currently 'git worktree add' produces output like the following:
Preparing ../foo (identifier foo)
HEAD is now at 26da330922 <title>
The '../foo' is the path where the worktree is created, which the user
has just given on the command line. The identifier is an internal
implementation detail, which is not particularly relevant for the user
and indeed isn't mentioned explicitly anywhere in the man page.
Instead of this message, print a message that gives the user a bit more
detail of what exactly 'git worktree' is doing. There are various dwim
modes which perform some magic under the hood, which should be
helpful to users. Just from the output of the command it is not always
visible to users what exactly has happened.
Help the users a bit more by modifying the "Preparing ..." message and
adding some additional information of what 'git worktree add' did under
the hood, while not displaying the identifier anymore.
Currently there are several different cases:
- 'git worktree add -b ...' or 'git worktree add <path>', both of
which create a new branch, either through the user explicitly
requesting it, or through 'git worktree add' implicitly creating
it. This will end up with the following output:
Preparing worktree (new branch '<branch>')
HEAD is now at 26da330922 <title>
- 'git worktree add -B ...', which may either create a new branch if
the branch with the given name does not exist yet, or resets an
existing branch to the current HEAD, or the commit-ish given.
Depending on which action is taken, we'll end up with the following
output:
Preparing worktree (resetting branch '<branch>'; was at caa68db14)
HEAD is now at 26da330922 <title>
or:
Preparing worktree (new branch '<branch>')
HEAD is now at 26da330922 <title>
- 'git worktree add --detach' or 'git worktree add <path>
<commit-ish>', both of which create a new worktree with a detached
HEAD, for which we will print the following output:
Preparing worktree (detached HEAD 26da330922)
HEAD is now at 26da330922 <title>
- 'git worktree add <path> <local-branch>', which checks out the
branch and prints the following output:
Preparing worktree (checking out '<local-branch>')
HEAD is now at 47007d5 <title>
Additionally currently the "Preparing ..." line is printed to stderr,
while the "HEAD is now at ..." line is printed to stdout by 'git reset
--hard', which is used internally by 'git worktree add'. Fix this
inconsistency by printing the "Preparing ..." message to stdout as
well. As "Preparing ..." is not an error, stdout also seems like the
more appropriate output stream.
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
There are two members of 'struct add_opts', which are only used inside
the 'add()' function, but being part of 'struct add_opts' they are
needlessly also passed to the 'add_worktree' function.
Make them local to the 'add()' function to make it clearer where they
are used.
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Declare that the *.py files in our tree are Python for the purposes of
diffing, and as in 00ddc9d13c ("Fix build with core.autocrlf=true",
2017-05-09) set eol=lf on them, which makes sense like with the *.perl
files.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
As noted in gitattributes(5) this gives better patch context for these
types of files.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Change the list of Perl extensions added in 00ddc9d13c ("Fix build
with core.autocrlf=true", 2017-05-09) to also include *.pl, we have
some of those in the tree, e.g. in t/.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We have the BUG() macro for that purpose.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This is yet another patch to be filed under the keyword "libification".
There is one subtle change in behavior here, where a `git log` that has
been asked to show the mergetags would now stop reporting the mergetags
upon the first failure, whereas previously, it would have continued to the
next mergetag, if any.
In practice, that change should not matter, as it is 1) uncommon to
perform octopus merges using multiple tags as merge heads, and 2) when the
user asks to be shown those tags, they really should be there.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This is a simple function that will interpret a string as a whitespace
delimited list of values, and add those values into the array.
Note: this function does not (yet) offer to split by arbitrary delimiters,
or keep empty values in case of runs of whitespace, or de-quote Unix shell
style. All fo this functionality can be added later, when and if needed.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The --rebase-merges mode is probably not half as intuitive to use as
its inventor hopes, so let's document it some.
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>
Similar to the `preserve` mode simply passing the `--preserve-merges`
option to the `rebase` command, the `merges` mode simply passes the
`--rebase-merges` option.
This will allow users to conveniently rebase non-trivial commit
topologies when pulling new commits, without flattening them.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The `git merge` command does not allow merging commits that are already
reachable from HEAD: `git merge HEAD^`, for example, will report that we
are already up to date and not change a thing.
In an interactive rebase, such a merge could occur previously, e.g. when
competing (or slightly modified) versions of a patch series were applied
upstream, and the user had to `git rebase --skip` all of the local
commits, and the topic branch becomes "empty" as a consequence.
Let's teach the todo command `merge` to behave the same as `git merge`.
Seeing as it requires some low-level trickery to create such merges with
Git's commands in the first place, we do not even have to bother to
introduce an option to force `merge` to create such merge commits.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In the previous patches, we implemented the basic functionality of the
`git rebase -i --rebase-merges` command, in particular the `merge`
command to create merge commits in the sequencer.
The interactive rebase is a lot more these days, though, than a simple
cherry-pick in a loop. For example, it calls the post-rewrite hook (if
any) after rebasing with a mapping of the old->new commits.
This patch implements the post-rewrite handling for the `merge` command
we just introduced. The other commands that were added recently (`label`
and `reset`) do not create new commits, therefore post-rewrite hooks do
not need to handle them.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This allows for rebases to be run in parallel in separate worktrees
(think: interrupted in the middle of one rebase, being asked to perform
a different rebase, adding a separate worktree just for that job).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
If there are empty commits on the left hand side of $upstream...HEAD
then the empty commits on the right hand side that we want to keep are
being pruned.
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Once upon a time, this here developer thought: wouldn't it be nice if,
say, Git for Windows' patches on top of core Git could be represented as
a thicket of branches, and be rebased on top of core Git in order to
maintain a cherry-pick'able set of patch series?
The original attempt to answer this was: git rebase --preserve-merges.
However, that experiment was never intended as an interactive option,
and it only piggy-backed on git rebase --interactive because that
command's implementation looked already very, very familiar: it was
designed by the same person who designed --preserve-merges: yours truly.
Some time later, some other developer (I am looking at you, Andreas!
;-)) decided that it would be a good idea to allow --preserve-merges to
be combined with --interactive (with caveats!) and the Git maintainer
(well, the interim Git maintainer during Junio's absence, that is)
agreed, and that is when the glamor of the --preserve-merges design
started to fall apart rather quickly and unglamorously.
The reason? In --preserve-merges mode, the parents of a merge commit (or
for that matter, of *any* commit) were not stated explicitly, but were
*implied* by the commit name passed to the `pick` command.
This made it impossible, for example, to reorder commits. Not to mention
to move commits between branches or, deity forbid, to split topic branches
into two.
Alas, these shortcomings also prevented that mode (whose original
purpose was to serve Git for Windows' needs, with the additional hope
that it may be useful to others, too) from serving Git for Windows'
needs.
Five years later, when it became really untenable to have one unwieldy,
big hodge-podge patch series of partly related, partly unrelated patches
in Git for Windows that was rebased onto core Git's tags from time to
time (earning the undeserved wrath of the developer of the ill-fated
git-remote-hg series that first obsoleted Git for Windows' competing
approach, only to be abandoned without maintainer later) was really
untenable, the "Git garden shears" were born [*1*/*2*]: a script,
piggy-backing on top of the interactive rebase, that would first
determine the branch topology of the patches to be rebased, create a
pseudo todo list for further editing, transform the result into a real
todo list (making heavy use of the `exec` command to "implement" the
missing todo list commands) and finally recreate the patch series on
top of the new base commit.
That was in 2013. And it took about three weeks to come up with the
design and implement it as an out-of-tree script. Needless to say, the
implementation needed quite a few years to stabilize, all the while the
design itself proved itself sound.
With this patch, the goodness of the Git garden shears comes to `git
rebase -i` itself. Passing the `--rebase-merges` option will generate
a todo list that can be understood readily, and where it is obvious
how to reorder commits. New branches can be introduced by inserting
`label` commands and calling `merge <label>`. And once this mode will
have become stable and universally accepted, we can deprecate the design
mistake that was `--preserve-merges`.
Link *1*:
https://github.com/msysgit/msysgit/blob/master/share/msysGit/shears.sh
Link *2*:
https://github.com/git-for-windows/build-extra/blob/master/shears.sh
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>
