Re: Can git tell me which uncommitted files clash with the incoming changes?

On Mon, Dec 17, 2018 at 2:11 PM Mark Kharitonov
[off-list ref] wrote:

Hi,
I have asked this question on SO
(https://stackoverflow.com/questions/53679167/can-git-tell-me-which-uncommitted-files-clash-with-the-incoming-changes)
and usually there are tons of responses on Git questions, but not on
this one.

Allow me to quote it now.

Please, observe:

    C:\Dayforce\test [master ↓2 +0 ~2 -0 !]> git pull
    error: Your local changes to the following files would be
overwritten by merge:
            2.txt
    Please commit your changes or stash them before you merge.
    Aborting
    Updating 2dc8bd0..ea343f8
    C:\Dayforce\test [master ↓2 +0 ~2 -0 !]>

Does git have a command that can tell me which uncommitted files cause
the this error? I can see them displayed by git pull, but I really do
not want to parse git pull output.

Assume that you have done "git fetch origin" (or whatever master's
upstream is). Do

git diff --name-only HEAD origin/master

You get the list of files that will need to be updated. Do

git diff --name-only

to get the list of files that have local changes. If this list shares
some paths with the first list, these paths will very likely cause
"git pull" to abort.

For a better check, I think you need to do "git read-tree -m" by
yourself (to a temporary index file with --index-output) then you can
examine that file and determine what file has changed compared to HEAD
(and if the same file has local changes, git-pull will be aborted).
You may need to read more in read-tree man page.

Ideally though, git-read-tree should be able to tell what paths are
updated in "--dry-run -u" mode. But I don't think it's supported yet.
-- 
Duy