Add an acc test covering failures when reading .git (#2223)

## Changes
- New test covering failures in reading .git. One case results in error,
some result in warning (not shown).
- New helper withdir runs commands in a subdirectory.

## Tests
New acceptance test.

acceptance/bundle/git-permerror/databricks.yml

@@ -0,0 +1,2 @@
+bundle:
+  name: git-permerror

acceptance/bundle/git-permerror/output.txt

@@ -0,0 +1,78 @@
+=== No permission to access .git. Badness: inferred flag is set to true even though we did not infer branch. bundle_root_path is not correct in subdir case.
+
+>>> chmod 000 .git
+
+>>> $CLI bundle validate
+Error: unable to load repository specific gitconfig: open config: permission denied
+
+Name: git-permerror
+Target: default
+Workspace:
+  User: $USERNAME
+  Path: /Workspace/Users/$USERNAME/.bundle/git-permerror/default
+
+Found 1 error
+
+Exit code: 1
+
+>>> $CLI bundle validate -o json
+Error: unable to load repository specific gitconfig: open config: permission denied
+
+
+Exit code: 1
+{
+  "bundle_root_path": ".",
+  "inferred": true
+}
+
+>>> withdir subdir/a/b $CLI bundle validate -o json
+Error: unable to load repository specific gitconfig: open config: permission denied
+
+
+Exit code: 1
+{
+  "bundle_root_path": ".",
+  "inferred": true
+}
+
+
+=== No permissions to read .git/HEAD. Badness: warning is not shown. inferred is incorrectly set to true. bundle_root_path is not correct in subdir case.
+
+>>> chmod 000 .git/HEAD
+
+>>> $CLI bundle validate -o json
+{
+  "bundle_root_path": ".",
+  "inferred": true
+}
+
+>>> withdir subdir/a/b $CLI bundle validate -o json
+{
+  "bundle_root_path": ".",
+  "inferred": true
+}
+
+
+=== No permissions to read .git/config. Badness: inferred is incorretly set to true. bundle_root_path is not correct is subdir case.
+
+>>> chmod 000 .git/config
+
+>>> $CLI bundle validate -o json
+Error: unable to load repository specific gitconfig: open config: permission denied
+
+
+Exit code: 1
+{
+  "bundle_root_path": ".",
+  "inferred": true
+}
+
+>>> withdir subdir/a/b $CLI bundle validate -o json
+Error: unable to load repository specific gitconfig: open config: permission denied
+
+
+Exit code: 1
+{
+  "bundle_root_path": ".",
+  "inferred": true
+}

acceptance/bundle/git-permerror/script

@@ -0,0 +1,25 @@
+mkdir myrepo
+cd myrepo
+cp ../databricks.yml .
+git-repo-init
+mkdir -p subdir/a/b
+
+printf "=== No permission to access .git. Badness: inferred flag is set to true even though we did not infer branch. bundle_root_path is not correct in subdir case.\n"
+trace chmod 000 .git
+errcode trace $CLI bundle validate
+errcode trace $CLI bundle validate -o json | jq .bundle.git
+errcode trace withdir subdir/a/b $CLI bundle validate -o json | jq .bundle.git
+
+printf "\n\n=== No permissions to read .git/HEAD. Badness: warning is not shown. inferred is incorrectly set to true. bundle_root_path is not correct in subdir case.\n"
+chmod 700 .git
+trace chmod 000 .git/HEAD
+errcode trace $CLI bundle validate -o json | jq .bundle.git
+errcode trace withdir subdir/a/b $CLI bundle validate -o json | jq .bundle.git
+
+printf "\n\n=== No permissions to read .git/config. Badness: inferred is incorretly set to true. bundle_root_path is not correct is subdir case.\n"
+chmod 666 .git/HEAD
+trace chmod 000 .git/config
+errcode trace $CLI bundle validate -o json | jq .bundle.git
+errcode trace withdir subdir/a/b $CLI bundle validate -o json | jq .bundle.git
+
+rm -fr .git

acceptance/bundle/git-permerror/test.toml

@@ -0,0 +1,5 @@
+Badness = "Warning logs not shown; inferred flag is set to true incorrect; bundle_root_path is not correct"
+
+[GOOS]
+# This test relies on chmod which does not work on Windows
+windows = false

acceptance/script.prepare

@@ -47,3 +47,14 @@ title() {
     local label="$1"
     printf "\n=== %s" "$label"
 }
+
+withdir() {
+    local dir="$1"
+    shift
+    local orig_dir="$(pwd)"
+    cd "$dir" || return $?
+    "$@"
+    local exit_code=$?
+    cd "$orig_dir" || return $?
+    return $exit_code
+}