builtin/diagnose.c: create 'git diagnose' builtin

Create a 'git diagnose' builtin to generate a standalone zip archive of
repository diagnostics.

The "diagnose" functionality was originally implemented for Scalar in
aa5c79a331 (scalar: implement `scalar diagnose`, 2022-05-28). However, the
diagnostics gathered are not specific to Scalar-cloned repositories and
can be useful when diagnosing issues in any Git repository.

Helped-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Helped-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/t/t0092-diagnose.sh b/t/t0092-diagnose.sh
new file mode 100755
index 0000000000..b6923726fd
--- /dev/null
+++ b/t/t0092-diagnose.sh
@@ -0,0 +1,32 @@
+#!/bin/sh
+
+test_description='git diagnose'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success UNZIP 'creates diagnostics zip archive' '
+	test_when_finished rm -rf report &&
+
+	git diagnose -o report -s test >out &&
+	grep "Available space" out &&
+
+	zip_path=report/git-diagnostics-test.zip &&
+	test_path_is_file "$zip_path" &&
+
+	# Check zipped archive content
+	"$GIT_UNZIP" -p "$zip_path" diagnostics.log >out &&
+	test_file_not_empty out &&
+
+	"$GIT_UNZIP" -p "$zip_path" packs-local.txt >out &&
+	grep ".git/objects" out &&
+
+	"$GIT_UNZIP" -p "$zip_path" objects-local.txt >out &&
+	grep "^Total: [0-9][0-9]*" out &&
+
+	# Should not include .git directory contents by default
+	! "$GIT_UNZIP" -l "$zip_path" | grep ".git/"
+	grep "^Total: [0-9][0-9]*" out
+'
+
+test_done