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checkout: use empty baseline when no index file exists #3823

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Merged
merged 1 commit into from
Jun 17, 2016
Merged

checkout: use empty baseline when no index file exists #3823

merged 1 commit into from
Jun 17, 2016

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ethomson
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When no index file exists and a baseline is not explicitly provided, use an empty baseline instead of trying to use HEAD as the baseline.

This is for compatibility with git:

% git status
On branch master
nothing to commit, working directory clean
% rm .git/index
% git status
On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

    deleted:    README
    deleted:    branch_file.txt
    deleted:    link_to_new.txt
    deleted:    new.txt

Untracked files:
  (use "git add <file>..." to include in what will be committed)

    README
    branch_file.txt
    link_to_new.txt
    new.txt
% git checkout HEAD
error: The following untracked working tree files would be overwritten by checkout:
    README
    branch_file.txt
    link_to_new.txt
    new.txt
Please move or remove them before you can switch branches.
Aborting
% git checkout --force HEAD
% git status
On branch master
nothing to commit, working directory clean

Our previous behavior was to try to load HEAD when the index does not exist, which would simply do a diff between the baseline (HEAD) and the target (again, HEAD), which would be a noop.

Fixes #3811

checkout: use empty baseline when no index
bb0bd71 
When no index file exists and a baseline is not explicitly provided, use
an empty baseline instead of trying to load `HEAD`.
@ethomson
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Note that this is still not completely correct: the "is this dirty" checkout conflict handling is not correctly taking the index into account but that's a different (and bigger) issue and I will follow up with a related pull request.

@carlosmn
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Seems legit. Or at least we're doing mostly what git does.

@carlosmn carlosmn merged commit 69c71f2 into master Jun 17, 2016
@ethomson ethomson deleted the ethomson/checkout_no_index branch January 13, 2017 12:29
@johnhaley81 johnhaley81 mentioned this pull request Feb 6, 2017
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2 participants
@ethomson @carlosmn