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