From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=AWL,BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by dcvr.yhbt.net (Postfix) with ESMTP id 4803E1F9FD for ; Tue, 16 Feb 2021 20:15:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230010AbhBPUN3 (ORCPT ); Tue, 16 Feb 2021 15:13:29 -0500 Received: from cloud.peff.net ([104.130.231.41]:34878 "EHLO cloud.peff.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229767AbhBPUN1 (ORCPT ); Tue, 16 Feb 2021 15:13:27 -0500 Received: (qmail 14711 invoked by uid 109); 16 Feb 2021 20:12:46 -0000 Received: from Unknown (HELO peff.net) (10.0.1.2) by cloud.peff.net (qpsmtpd/0.94) with ESMTP; Tue, 16 Feb 2021 20:12:46 +0000 Authentication-Results: cloud.peff.net; auth=none Received: (qmail 28926 invoked by uid 111); 16 Feb 2021 20:12:45 -0000 Received: from coredump.intra.peff.net (HELO sigill.intra.peff.net) (10.0.0.2) by peff.net (qpsmtpd/0.94) with (TLS_AES_256_GCM_SHA384 encrypted) ESMTPS; Tue, 16 Feb 2021 15:12:45 -0500 Authentication-Results: peff.net; auth=none Date: Tue, 16 Feb 2021 15:12:45 -0500 From: Jeff King To: git@vger.kernel.org Cc: Derrick Stolee Subject: [PATCH] t/perf: handle worktrees as test repos Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org The perf suite gets confused when test_perf_default_repo is pointed at a worktree (which includes when it is run from within a worktree at all, since the default is to use the current repository). Here's an example: $ git worktree add ~/foo Preparing worktree (new branch 'foo') HEAD is now at 328c109303 The eighth batch $ cd ~/foo $ make [...build output...] $ cd t/perf $ ./p0000-perf-lib-sanity.sh -v -i [...] perf 1 - test_perf_default_repo works: running: foo=$(git rev-parse HEAD) && test_export foo fatal: ambiguous argument 'HEAD': unknown revision or path not in the working tree. Use '--' to separate paths from revisions, like this: 'git [...] -- [...]' The problem is that we didn't copy all of the necessary files from the source repository (in this case we got HEAD, but we have no refs!). We discover the git-dir with "rev-parse --git-dir", but this points to the worktree's partial repository in .../.git/worktrees/foo. That partial repository has a "commondir" file which points to the main repository, where the actual refs are stored, but we don't copy it. This is the correct thing to do, though! If we did copy it, then our scratch test repo would be pointing back to the original main repo, and any ref updates we made in the tests would impact that original repo. Instead, we need to either: 1. Make a scratch copy of the original main repo (in addition to the worktree repo), and point the scratch worktree repo's commondir at it. This preserves the original relationship, but it's doubtful any script really cares (if they are testing worktree performance, they'd probably make their own worktrees). And it's trickier to get right. 2. Collapse the main and worktree repos into a single scratch repo. This can be done by copying everything from both, preferring any files from the worktree repo. This patch does the second one. With this applied, the example above results in p0000 running successfully. Reported-by: Derrick Stolee Signed-off-by: Jeff King --- Having written that, it occurs to me that an even simpler solution is to just always use the commondir as the source of the scratch repo. It does not produce the same outcome, but the point is generally just to find a suitable starting point for a repository. Grabbing the main repo instead of one of its worktrees is probably OK for most tests. t/perf/perf-lib.sh | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-) diff --git a/t/perf/perf-lib.sh b/t/perf/perf-lib.sh index e385c6896f..1226be4005 100644 --- a/t/perf/perf-lib.sh +++ b/t/perf/perf-lib.sh @@ -70,27 +70,40 @@ test_perf_do_repo_symlink_config_ () { test_have_prereq SYMLINKS || git config core.symlinks false } +test_perf_copy_repo_contents () { + for stuff in "$1"/* + do + case "$stuff" in + */objects|*/hooks|*/config|*/commondir) + ;; + *) + cp -R "$stuff" "$repo/.git/" || exit 1 + ;; + esac + done +} + test_perf_create_repo_from () { test "$#" = 2 || BUG "not 2 parameters to test-create-repo" repo="$1" source="$2" source_git="$("$MODERN_GIT" -C "$source" rev-parse --git-dir)" objects_dir="$("$MODERN_GIT" -C "$source" rev-parse --git-path objects)" + common_dir="$("$MODERN_GIT" -C "$source" rev-parse --git-common-dir)" mkdir -p "$repo/.git" ( cd "$source" && { 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|*/commondir) - ;; - *) - cp -R "$stuff" "$repo/.git/" || exit 1 - ;; - esac - done + + # common_dir must come first here, since we want source_git to + # take precedence and overwrite any overlapping files + test_perf_copy_repo_contents "$common_dir" + if test "$source_git" != "$common_dir" + then + test_perf_copy_repo_contents "$source_git" + fi ) && ( cd "$repo" && -- 2.30.1.989.g5e01c2f281