Mercurial - see list of files that need to be manually merged?

Question

Is there a Mercurial command you can use after an hg pull to see a list of all files that will be need to be manually merged (ie: that have conflicts) when doing an

Answer 1

You can use the --rev option of hg stat with a pair of revisions to see what file differences exist between the two. See below for a slightly verbose but detailed example:

First we start by making a new repository:

[gkeramidas /tmp]$ hg init foo
[gkeramidas /tmp]$ cd foo

Then add a single file called foo.txt to the new repository:

[gkeramidas /tmp/foo]$ echo foo > foo.txt
[gkeramidas /tmp/foo]$ hg commit -Am 'add foo'
adding foo.txt
[gkeramidas /tmp/foo]$ hg glog
@  0[tip]   b7ac7bd864b7   2011-01-30 18:11 -0800   gkeramidas
     add foo

Now add a second file, called bar.txt as revision 1:

[gkeramidas /tmp/foo]$ echo bar > bar.txt
[gkeramidas /tmp/foo]$ hg commit -Am 'add bar'
adding bar.txt

Go back to revision 0, and add a third file, on a different head. This is done to simulate a pull from someone else who had cloned the same repository at its starting revision:

[gkeramidas /tmp/foo]$ hg up -C 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
[gkeramidas /tmp/foo]$ echo koko > koko.txt
[gkeramidas /tmp/foo]$ hg commit -Am 'add koko'
adding koko.txt
created new head
[gkeramidas /tmp/foo]$ hg glog
@  2[tip]:0   e5d80abdcb06   2011-01-30 18:12 -0800   gkeramidas
|    add koko
|
| o  1   a2d0d0e66ce4   2011-01-30 18:12 -0800   gkeramidas
|/     add bar
|
o  0   b7ac7bd864b7   2011-01-30 18:11 -0800   gkeramidas
     add foo

Now you can use hg stat to see what file differences exist between any pair of revisions, e.g. the changes from rev 0 to rev 1 added 'bar.txt' to the file list:

[gkeramidas /tmp/foo]$ hg stat --rev 0:1
A bar.txt

The changes from rev 0 to rev2 added 'koko.txt' to the file list:

[gkeramidas /tmp/foo]$ hg stat --rev 0:2
A koko.txt

But more interestingly, the changes from rev 1 to rev 2 involve two file manifest changes. (1) 'koko.txt' was added in rev 2, and (2) 'bar.txt' exists in rev 1 but is missing from rev 2, so it shows as a 'removed' file:

[gkeramidas /tmp/foo]$ hg stat --rev 1:2
A koko.txt
R bar.txt

Answer 2

Unless I'm misreading it myself, the answers above don't seem to address the question that I think is being asked: I have two branches in my repository that I'd like to merge, and I want to know what conflicts will come up (e.g., before stepping through the conflict resolutions one-by-one.)

To do this, I would merge with the :merge3 tool (which tries to merge automatically, but leaves conflicts unresolved) and then use hg resolve --list — or just look at the output of merge command — to see the conflicts.

hg merge <otherbranch> --tool :merge3
hg resolve -l

If you didn't actually want to merge in the end (if you just want to see what would conflict) you can run hg update -C afterwards to undo the merge.

If you do want to finish the merge, you can run hg resolve <filepath> for each file, or just hg resolve --all to step through all that remain with conflicts, before you hg commit the merge changeset.

Answer 3

hg resolve --list

From the documentation:

Merges with unresolved conflicts are often the result of non-interactive merging using the internal:merge configuration setting, or a command-line merge tool like diff3. The resolve command is used to manage the files involved in a merge, after hg merge has been run, and before hg commit is run (i.e. the working directory must have two parents).

Edit 5 January 2012:

(I received an up vote for this answer today so I revisited it. I discovered that I misunderstood the question.)

The question is "I have performed a pull from a remote repository and have not yet performed a merge. Can I see what conflicts will be created upon performing the merge?"

My answer above is clearly wrong. After reading through the linked documentation, I do not think there is a built-in method for doing this. However, there is a way to do it without ruining your working source tree.

Let's assume you have cloned repository A from some remote source to repository B on your local system, i.e. hg clone http://hg.example.com/A B. After doing so, you make changes to your local repository, B, that involve at least one commit. In the meantime, changes have been made to repository A so that when you do a pull you get a message indicated new changesets have been added and heads have been created.

At this point, you can do hg heads to list the two changesets that will be involved in a merge. From this information, you can issue a status command to list the differences between the heads. Assuming the revision numbers in your repository B, according to the heads list, are "1" and "2", then you can do hg status --rev 1:2 to see a list of the changes.

Of course, this doesn't really tell you if conflicts will occur when you do a merge. Since there isn't a command that will show you this, you will have to "preview" the merge by cloning to a new repository and doing the merge there. So, hg clone B C && cd C && hg merge. If you are satisfied with the result of this merge you can do hg com -m 'Merging complete' && hg push && cd ../ && rm -rf C.

It's a bit of a process, but it keeps your current source tree clean if the merge turns out to be a disaster. You might also find this description of working with public repositories helpful.

Answer 4

I think hg status is what you are looking for.

You may want to read this chapter from Mercurial: The Definitive Guide

http://hgbook.red-bean.com/read/mercurial-in-daily-use.html