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-rwxr-xr-xt/t7817-grep-sparse-checkout.sh181
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diff --git a/t/t7817-grep-sparse-checkout.sh b/t/t7817-grep-sparse-checkout.sh
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+#!/bin/sh
+
+test_description='grep in sparse checkout
+
+This test creates a repo with the following structure:
+
+.
+|-- a
+|-- b
+|-- dir
+| `-- c
+|-- sub
+| |-- A
+| | `-- a
+| `-- B
+| `-- b
+`-- sub2
+ `-- a
+
+Where the outer repository has non-cone mode sparsity patterns, sub is a
+submodule with cone mode sparsity patterns and sub2 is a submodule that is
+excluded by the superproject sparsity patterns. The resulting sparse checkout
+should leave the following structure in the working tree:
+
+.
+|-- a
+|-- sub
+| `-- B
+| `-- b
+`-- sub2
+ `-- a
+
+But note that sub2 should have the SKIP_WORKTREE bit set.
+'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+ echo "text" >a &&
+ echo "text" >b &&
+ mkdir dir &&
+ echo "text" >dir/c &&
+
+ git init sub &&
+ (
+ cd sub &&
+ mkdir A B &&
+ echo "text" >A/a &&
+ echo "text" >B/b &&
+ git add A B &&
+ git commit -m sub &&
+ git sparse-checkout init --cone &&
+ git sparse-checkout set B
+ ) &&
+
+ git init sub2 &&
+ (
+ cd sub2 &&
+ echo "text" >a &&
+ git add a &&
+ git commit -m sub2
+ ) &&
+
+ git submodule add ./sub &&
+ git submodule add ./sub2 &&
+ git add a b dir &&
+ git commit -m super &&
+ git sparse-checkout init --no-cone &&
+ git sparse-checkout set "/*" "!b" "!/*/" "sub" &&
+
+ git tag -am tag-to-commit tag-to-commit HEAD &&
+ tree=$(git rev-parse HEAD^{tree}) &&
+ git tag -am tag-to-tree tag-to-tree $tree &&
+
+ test_path_is_missing b &&
+ test_path_is_missing dir &&
+ test_path_is_missing sub/A &&
+ test_path_is_file a &&
+ test_path_is_file sub/B/b &&
+ test_path_is_file sub2/a &&
+ git branch -m main
+'
+
+# The test below covers a special case: the sparsity patterns exclude '/b' and
+# sparse checkout is enabled, but the path exists in the working tree (e.g.
+# manually created after `git sparse-checkout init`). Although b is marked
+# as SKIP_WORKTREE, git grep should notice it IS present in the worktree and
+# report it.
+test_expect_success 'working tree grep honors sparse checkout' '
+ cat >expect <<-EOF &&
+ a:text
+ b:new-text
+ EOF
+ test_when_finished "rm -f b" &&
+ echo "new-text" >b &&
+ git grep "text" >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'grep searches unmerged file despite not matching sparsity patterns' '
+ cat >expect <<-EOF &&
+ b:modified-b-in-branchX
+ b:modified-b-in-branchY
+ EOF
+ test_when_finished "test_might_fail git merge --abort && \
+ git checkout main && git sparse-checkout init" &&
+
+ git sparse-checkout disable &&
+ git checkout -b branchY main &&
+ test_commit modified-b-in-branchY b &&
+ git checkout -b branchX main &&
+ test_commit modified-b-in-branchX b &&
+
+ git sparse-checkout init &&
+ test_path_is_missing b &&
+ test_must_fail git merge branchY &&
+ git grep "modified-b" >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'grep --cached searches entries with the SKIP_WORKTREE bit' '
+ cat >expect <<-EOF &&
+ a:text
+ b:text
+ dir/c:text
+ EOF
+ git grep --cached "text" >actual &&
+ test_cmp expect actual
+'
+
+# Note that sub2/ is present in the worktree but it is excluded by the sparsity
+# patterns. We also explicitly mark it as SKIP_WORKTREE in case it got cleared
+# by previous git commands. Thus sub2 starts as SKIP_WORKTREE but since it is
+# present in the working tree, grep should recurse into it.
+test_expect_success 'grep --recurse-submodules honors sparse checkout in submodule' '
+ cat >expect <<-EOF &&
+ a:text
+ sub/B/b:text
+ sub2/a:text
+ EOF
+ git update-index --skip-worktree sub2 &&
+ git grep --recurse-submodules "text" >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'grep --recurse-submodules --cached searches entries with the SKIP_WORKTREE bit' '
+ cat >expect <<-EOF &&
+ a:text
+ b:text
+ dir/c:text
+ sub/A/a:text
+ sub/B/b:text
+ sub2/a:text
+ EOF
+ git grep --recurse-submodules --cached "text" >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'working tree grep does not search the index with CE_VALID and SKIP_WORKTREE' '
+ cat >expect <<-EOF &&
+ a:text
+ EOF
+ test_when_finished "git update-index --no-assume-unchanged b" &&
+ git update-index --assume-unchanged b &&
+ git grep text >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'grep --cached searches index entries with both CE_VALID and SKIP_WORKTREE' '
+ cat >expect <<-EOF &&
+ a:text
+ b:text
+ dir/c:text
+ EOF
+ test_when_finished "git update-index --no-assume-unchanged b" &&
+ git update-index --assume-unchanged b &&
+ git grep --cached text >actual &&
+ test_cmp expect actual
+'
+
+test_done