mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-15 18:12:47 +03:00
c7480c9b07
If both sides changed a file in the same way, %mate used the version in
the mergebase, which is incorrect. This changes it to use the version
in the destination desk.
An example of this issue:
> +cat %/test/hoon
/~zod/home/~2020.9.3..21.41.24..61ed/test/hoon
first
> |merge %scratch our %home
>=
merged with strategy %fine
+ /~zod/scratch/2/test/hoon
> +cat /=scratch=/test
/~zod/scratch/~2020.9.3..21.41.32..408c/test/hoon
first
> *%/test/hoon 'second'
: /~zod/home/3/test/hoon
> *%%%/scratch=/test/hoon 'second'
: /~zod/scratch/3/test/hoon
> |merge %scratch our %home
>=
%fine merge failed, trying %meet
%meet merge failed, trying %mate
merged with strategy %mate
: /~zod/scratch/4/test/hoon
> +cat /=scratch=/test
/~zod/scratch/~2020.9.3..21.42.25..9e8b/test/hoon
first
111 lines
6.3 KiB
Plaintext
111 lines
6.3 KiB
Plaintext
Usage:
|
|
|
|
|merge %destination-desk ~source-ship %source-desk
|
|
|merge %destination-desk ~source-ship %source-desk, =gem %strategy
|
|
|merge %destination-desk ~source-ship %source-desk, =cas ud+5
|
|
|
|
We support various merge strategies. A "commit" is a snapshot of
|
|
the files with a list of parents plus a date. Most commits have
|
|
one parent; a "merge" commit is a commit with two parents. The
|
|
%home desk starts with an initial commit with no parents; commits
|
|
with several parents ("octopus merges") are possible but we don't
|
|
generate them right now.
|
|
|
|
Unless otherwise specified, all of the following create a new commit
|
|
with the source and destination commits as parents.
|
|
|
|
Several strategies need a "merge-base". They find it by identifying
|
|
the most recent common ancestor of the two desks. If none, fail
|
|
with %merge-no-merge-base; if there are two or more, pick one.
|
|
|
|
%init: the only way to create a desk. Not a true merge, since it
|
|
simply assigns the source commit to the destination.
|
|
|
|
%fine: if source or destination are in the ancestry of each other,
|
|
use the newer one; else abort. If the destination is ahead of the
|
|
source, succeed but do nothing. If the source is ahead of the
|
|
destination, assign the next revision number to the source commit.
|
|
Some call this "fast-forward".
|
|
|
|
%meet: combine changes, failing if both sides changed the same file.
|
|
Specifically, take diff(merge-base,source) and
|
|
diff(merge-base,destination) and combine them as long as those diffs
|
|
touch different files.
|
|
|
|
%mate: combine changes, failing if both sides changed the same part
|
|
of a file. Identical to %meet, except that some marks, like %hoon,
|
|
allow intelligent merge of changes to different parts of a file.
|
|
|
|
%meld: combine changes; if both sides changed the same part of a
|
|
file, use the version of the file in the merge-base.
|
|
|
|
%only-this: create a merge commit with exactly the contents of the
|
|
destination desk.
|
|
|
|
%only-that: create a merge commit with exactly the contents of the
|
|
source commit.
|
|
|
|
%take-this: create a merge commit with exactly the contents of the
|
|
destination desk except take any files from the source commit which
|
|
are not in the destination desk.
|
|
|
|
%take-that: create a merge commit with exactly the contents of the
|
|
source commit except preserve any files from the destination desk
|
|
which are not in the source commit.
|
|
|
|
%meet-this: merge as in %meet, except if both sides changed the same
|
|
file, use the version in the destination desk.
|
|
|
|
%meet-that: merge as in %meet, except if both sides changed the same
|
|
file, use the version in the source commit.
|
|
|
|
# Examples and notes:
|
|
|
|
The most common merge strategy is %mate, which is a normal 3-way
|
|
merge which aborts on conflict.
|
|
|
|
%take-that is useful to "force" an OTA. After running %take-that,
|
|
you're guaranteed to have exactly the files in the source commit plus
|
|
any files you separately added.
|
|
|
|
We speak of merging into a destination *desk* from a source *commit*
|
|
because while you can only merge on top of a desk, you can merge from
|
|
historical commits. For example,
|
|
|
|
|merge %old our %home, =cas ud+5, =gem %init
|
|
|
|
will create a new desk called %old with the 5th commit in %home.
|
|
You can revert the contents of a desk to what they were yesterday
|
|
with
|
|
|
|
|merge %home our %home, =cas da+(sub now ~d1), =gem %only-that
|
|
|
|
Note this is a normal %only-that merge, which means you're creating a
|
|
*new* commit with the old *contents*.
|
|
|
|
%meld is rarely used on its own, however if you specify %auto or
|
|
omit the merge strategy, %kiln will run a %meld merge into a scratch
|
|
desk and then annotate the conflicts there.
|
|
|
|
If you resolve merge conflicts manually, for example by mounting the
|
|
desks, copying the files in unix and then running |commit, you
|
|
should usually run an %only-this merge. This will not change the
|
|
newly-fixed contents of your desk, but it will record that the merge
|
|
happened so that those conflicts don't reappear in later merges.
|
|
|
|
If you get a %merge-no-merge-base error, this means you're trying to
|
|
merge two desks which have no common ancestors. You need to give
|
|
them a common ancestor by choosing a merge strategy which doesn't
|
|
need a merge-base, like %only-this, %only-that, %take-this, or
|
|
%take-that.
|
|
|
|
%take-this could be useful to install 3rd party software, but you
|
|
couldn't get subsequent updates this way, since the files would
|
|
already exist in the destination desk. Something like "take only
|
|
the files which aren't in my OTA source or any other 3rd party app"
|
|
would be basically correct. This would require a parameter listing
|
|
the desks to not conflict with.
|
|
|
|
%meet-this and %meet-that imply the existence of %mate-this and
|
|
%mate-that, but those don't exist yet.
|