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When git diff is given a symmetric difference A...B, it chooses
some merge base from the two specified commits (as documented).
This fails, however, if there is *no* merge base: instead, you
see the differences between A and B, which is certainly not what
is expected.
Moreover, if additional revisions are specified on the command
line ("git diff A...B C"), the results get a bit weird:
* If there is a symmetric difference merge base, this is used
as the left side of the diff. The last final ref is used as
the right side.
* If there is no merge base, the symmetric status is completely
lost. We will produce a combined diff instead.
Similar weirdness occurs if you use, e.g., "git diff C A...B D".
Likewise, using multiple two-dot ranges, or tossing extra
revision specifiers into the command line with two-dot ranges,
or mixing two and three dot ranges, all produce nonsense.
To avoid all this, add a routine to catch the range cases and
verify that that the arguments make sense. As a side effect,
produce a warning showing *which* merge base is being used when
there are multiple choices; die if there is no merge base.
Signed-off-by: Chris Torek <chris.torek@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
91 lines
2.2 KiB
Bash
Executable file
91 lines
2.2 KiB
Bash
Executable file
#!/bin/sh
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test_description='behavior of diff with symmetric-diff setups'
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. ./test-lib.sh
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# build these situations:
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# - normal merge with one merge base (br1...b2r);
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# - criss-cross merge ie 2 merge bases (br1...master);
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# - disjoint subgraph (orphan branch, br3...master).
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#
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# B---E <-- master
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# / \ /
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# A X
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# \ / \
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# C---D--G <-- br1
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# \ /
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# ---F <-- br2
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#
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# H <-- br3
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#
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# We put files into a few commits so that we can verify the
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# output as well.
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test_expect_success setup '
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git commit --allow-empty -m A &&
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echo b >b &&
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git add b &&
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git commit -m B &&
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git checkout -b br1 HEAD^ &&
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echo c >c &&
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git add c &&
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git commit -m C &&
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git tag commit-C &&
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git merge -m D master &&
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git tag commit-D &&
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git checkout master &&
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git merge -m E commit-C &&
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git checkout -b br2 commit-C &&
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echo f >f &&
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git add f &&
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git commit -m F &&
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git checkout br1 &&
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git merge -m G br2 &&
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git checkout --orphan br3 &&
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git commit -m H
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'
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test_expect_success 'diff with one merge base' '
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git diff commit-D...br1 >tmp &&
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tail -n 1 tmp >actual &&
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echo +f >expect &&
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test_cmp expect actual
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'
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# The output (in tmp) can have +b or +c depending
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# on which merge base (commit B or C) is picked.
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# It should have one of those two, which comes out
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# to seven lines.
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test_expect_success 'diff with two merge bases' '
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git diff br1...master >tmp 2>err &&
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test_line_count = 7 tmp &&
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test_line_count = 1 err
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'
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test_expect_success 'diff with no merge bases' '
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test_must_fail git diff br2...br3 >tmp 2>err &&
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test_i18ngrep "fatal: br2...br3: no merge base" err
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'
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test_expect_success 'diff with too many symmetric differences' '
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test_must_fail git diff br1...master br2...br3 >tmp 2>err &&
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test_i18ngrep "usage" err
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'
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test_expect_success 'diff with symmetric difference and extraneous arg' '
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test_must_fail git diff master br1...master >tmp 2>err &&
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test_i18ngrep "usage" err
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'
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test_expect_success 'diff with two ranges' '
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test_must_fail git diff master br1..master br2..br3 >tmp 2>err &&
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test_i18ngrep "usage" err
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'
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test_expect_success 'diff with ranges and extra arg' '
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test_must_fail git diff master br1..master commit-D >tmp 2>err &&
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test_i18ngrep "usage" err
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'
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test_done
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