create src

src-worktree-state/tests/fixtures/make_traverse_trees.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+set -eu -o pipefail
+
+# Makes a repo carrying a tree structure representing the given path to a blob.
+# File content is from stdin. Args are repo name, path, -x or +x, and tr sets.
+function make_repo() (
+  local repo="$1" path="$2" xbit="$3" set1="$4" set2="$5"
+  local dir dir_standin path_standin path_standin_pattern path_replacement
+
+  git init -- "$repo"
+  cd -- "$repo" # Temporary, as the function body is a ( ) subshell.
+
+  dir="${path%/*}"
+  dir_standin="$(tr "$set1" "$set2" <<<"$dir")"
+  path_standin="$(tr "$set1" "$set2" <<<"$path")"
+  mkdir -p -- "$dir_standin"
+  cat >"$path_standin"
+  git add --chmod="$xbit" -- "$path_standin"
+  path_standin_pattern="$(sed 's/[|.*^$\]/\\&/g' <<<"$path_standin")"
+  path_replacement="$(sed 's/[|&\]/\\&/g' <<<"$path")"
+  cp .git/index old_index
+  LC_ALL=C sed "s|$path_standin_pattern|$path_replacement|g" old_index >.git/index
+  git commit -m 'Initial commit'
+)
+
+make_repo traverse_dotdot_trees '../outside' -x '.' '@' \
+  <<<'A file outside the working tree, somehow.'
+
+make_repo traverse_dotgit_trees '.git/hooks/pre-commit' +x '.' '@' <<'EOF'
+#!/bin/sh
+printf 'Vulnerable!\n'
+date >vulnerable
+EOF
+
+make_repo traverse_dotgit_stream '.git::$INDEX_ALLOCATION/hooks/pre-commit' +x ':' ',' <<'EOF'
+#!/bin/sh
+printf 'Vulnerable!\n'
+date >vulnerable
+EOF