Re: git-status -- trying to understand all possible states

Michael Toy [off-list ref] writes:

Of the 24 possibilities (not counting ignored) in git-status,
there are 7 that I can't figure out how to generate.

As the post [*1*] that triggered e92e9cd3 (Documentation
improvements for the description of short format., 2010-04-23),
which is where the bulk of the format description comes from, says,
this is "Patches welcome" ;-) Some are just covering possible
permutations and it is not surprising if they would not appear in
practice.

D           M    deleted from index

I doubt this is possible in practice; once you do not have the entry
in the index, we do not even look at the working tree file, so it
would be unusual to see M in the second column.

D           D    unmerged, both deleted
A           U    unmerged, added by us
U           A    unmerged, added by them

    $ x="100644 $(git hash-object --stdin </dev/null)" &&
      printf "$x 2\tbar\n$x 1\tfoo\n$x 3\tbaz" |
      git update-index --index-info
    $ git status --short -suno
    AU bar
    UA baz
    DD foo
    $ git ls-files -u
    100644 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 2       bar
    100644 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 3       baz
    100644 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 1       foo

When you are using higher-level machinery to merge, "we added, they
left it missing" (i.e. bar that has only stage #2) is automatically
resolved to an addition by the trivial merge machinery.  The "they
added, we left it missing" (i.e. baz with only stage #3) case is
identical.  Also "both of us removed" (i.e. foo that has only stage
#1) is resolved to a deletion by the trivial merge machinery.  Hence
you would not see these three unless you are developing Git using a
low-level plumbing machinery.

[Reference]

*1* http://thread.gmane.org/gmane.comp.version-control.git/144455/focus=144468

On Apr 1, 2014, at 2:37 PM, Junio C Hamano [off-list ref] wrote:

quoted

D           M    deleted from index

I doubt this is possible in practice ...

quoted

D           D    unmerged, both deleted
A           U    unmerged, added by us
U           A    unmerged, added by them

  ... you would not see these three unless you are developing Git using a
low-level plumbing machinery.

Thanks, that is very helpful.

The "C[ MD]" are now the remaining mystery