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https://github.com/NixOS/nix
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09a7ce962d
Shallow clones are faster to access because we don't have to compute the revCount, which in sparse checkouts might not even exists. This is especially useful in combination with lazy trees in mind on large repository such as nixpkgs.
72 lines
3.2 KiB
Bash
72 lines
3.2 KiB
Bash
#!/usr/bin/env bash
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# shellcheck source=common.sh
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source common.sh
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requireGit
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# Create a test repo with multiple commits for all our tests
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git init "$TEST_ROOT/shallow-parent"
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git -C "$TEST_ROOT/shallow-parent" config user.email "foobar@example.com"
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git -C "$TEST_ROOT/shallow-parent" config user.name "Foobar"
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# Add several commits to have history
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echo "{ outputs = _: {}; }" > "$TEST_ROOT/shallow-parent/flake.nix"
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echo "" > "$TEST_ROOT/shallow-parent/file.txt"
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git -C "$TEST_ROOT/shallow-parent" add file.txt flake.nix
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git -C "$TEST_ROOT/shallow-parent" commit -m "First commit"
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echo "second" > "$TEST_ROOT/shallow-parent/file.txt"
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git -C "$TEST_ROOT/shallow-parent" commit -m "Second commit" -a
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echo "third" > "$TEST_ROOT/shallow-parent/file.txt"
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git -C "$TEST_ROOT/shallow-parent" commit -m "Third commit" -a
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# Add a branch for testing ref fetching
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git -C "$TEST_ROOT/shallow-parent" checkout -b dev
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echo "branch content" > "$TEST_ROOT/shallow-parent/branch-file.txt"
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git -C "$TEST_ROOT/shallow-parent" add branch-file.txt
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git -C "$TEST_ROOT/shallow-parent" commit -m "Branch commit"
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# Make a shallow clone (depth=1)
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git clone --depth 1 "file://$TEST_ROOT/shallow-parent" "$TEST_ROOT/shallow-clone"
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# Test 1: Fetching a shallow repo shouldn't work by default, because we can't
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# return a revCount.
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(! nix eval --impure --raw --expr "(builtins.fetchGit { url = \"$TEST_ROOT/shallow-clone\"; ref = \"dev\"; }).outPath")
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# Test 2: But you can request a shallow clone, which won't return a revCount.
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path=$(nix eval --impure --raw --expr "(builtins.fetchTree { type = \"git\"; url = \"file://$TEST_ROOT/shallow-clone\"; ref = \"dev\"; shallow = true; }).outPath")
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# Verify file from dev branch exists
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[[ -f "$path/branch-file.txt" ]]
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# Verify revCount is missing
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[[ $(nix eval --impure --expr "(builtins.fetchTree { type = \"git\"; url = \"file://$TEST_ROOT/shallow-clone\"; ref = \"dev\"; shallow = true; }).revCount or 123") == 123 ]]
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# Test 3: Check unlocked input error message
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expectStderr 1 nix eval --expr 'builtins.fetchTree { type = "git"; url = "file:///foo"; }' | grepQuiet "'fetchTree' will not fetch unlocked input"
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# Test 4: Regression test for revCount in worktrees derived from shallow clones
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# Add a worktree to the shallow clone
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git -C "$TEST_ROOT/shallow-clone" worktree add "$TEST_ROOT/shallow-worktree"
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# Prior to the fix, this would error out because of the shallow clone's
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# inability to find parent commits. Now it should return an error.
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if nix eval --impure --expr "(builtins.fetchGit { url = \"file://$TEST_ROOT/shallow-worktree\"; }).revCount" 2>/dev/null; then
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echo "fetchGit unexpectedly succeeded on shallow clone" >&2
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exit 1
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fi
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# Also verify that fetchTree fails similarly
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if nix eval --impure --expr "(builtins.fetchTree { type = \"git\"; url = \"file://$TEST_ROOT/shallow-worktree\"; }).revCount" 2>/dev/null; then
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echo "fetchTree unexpectedly succeeded on shallow clone" >&2
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exit 1
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fi
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# Verify that we can shallow fetch the worktree
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git -C "$TEST_ROOT/shallow-worktree" rev-list --count HEAD >/dev/null
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nix eval --impure --raw --expr "(builtins.fetchGit { url = \"file://$TEST_ROOT/shallow-worktree\"; shallow = true; }).rev"
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# Normal flake operation work because they use shallow by default
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pushd "$TEST_ROOT/shallow-worktree"
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nix flake metadata
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popd
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