Merge branch 'js/perf-rebase-i'

Add perf test for "rebase -i"

* js/perf-rebase-i:
  perf: run "rebase -i" under perf
  perf: make the tests work in worktrees
  perf: let's disable symlinks when they are not available

t/perf/p3404-rebase-interactive.sh

+#!/bin/sh
+
+test_description='Tests rebase -i performance'
+. ./perf-lib.sh
+
+test_perf_default_repo
+
+# This commit merges a sufficiently long topic branch for reasonable
+# performance testing
+branch_merge=ba5312da19c6fdb6c6747d479f58932aae6e900c^{commit}
+export branch_merge
+
+git rev-parse --verify $branch_merge >/dev/null 2>&1 || {
+	skip_all='skipping because $branch_merge was not found'
+	test_done
+}
+
+write_script swap-first-two.sh <<\EOF
+case "$1" in
+*/COMMIT_EDITMSG)
+	mv "$1" "$1".bak &&
+	sed -e '1{h;d}' -e 2G <"$1".bak >"$1"
+	;;
+esac
+EOF
+
+test_expect_success 'setup' '
+	git config core.editor "\"$PWD"/swap-first-two.sh\" &&
+	git checkout -f $branch_merge^2
+'
+
+test_perf 'rebase -i' '
+	git rebase -i $branch_merge^
+'
+
+test_done

t/perf/perf-lib.sh

@@ -80,23 +80,26 @@ test_perf_create_repo_from () {
 	error "bug in the test script: not 2 parameters to test-create-repo"
 	repo="$1"
 	source="$2"
-	source_git=$source/$(cd "$source" && git rev-parse --git-dir)
+	source_git="$(git -C "$source" rev-parse --git-dir)"
+	objects_dir="$(git -C "$source" rev-parse --git-path objects)"
 	mkdir -p "$repo/.git"
 	(
-		cd "$repo/.git" &&
-		{ cp -Rl "$source_git/objects" . 2>/dev/null ||
-			cp -R "$source_git/objects" .; } &&
+		{ cp -Rl "$objects_dir" "$repo/.git/" 2>/dev/null ||
+			cp -R "$objects_dir" "$repo/.git/"; } &&
 		for stuff in "$source_git"/*; do
 			case "$stuff" in
-				*/objects|*/hooks|*/config)
+				*/objects|*/hooks|*/config|*/commondir)
 					;;
 				*)
-					cp -R "$stuff" . || exit 1
+					cp -R "$stuff" "$repo/.git/" || exit 1
 					;;
 			esac
 		done &&
-		cd .. &&
-		git init -q &&
+		cd "$repo" &&
+		git init -q && {
+			test_have_prereq SYMLINKS ||
+			git config core.symlinks false
+		} &&
 		mv .git/hooks .git/hooks-disabled 2>/dev/null
 	) || error "failed to copy repository '$source' to '$repo'"
 }