From patchwork Mon Jul 27 16:25:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Jean-No=C3=ABl_Avila_via_GitGitGadget?= X-Patchwork-Id: 11687157 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B8126138C for ; Mon, 27 Jul 2020 16:25:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A065206E7 for ; Mon, 27 Jul 2020 16:25:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="WtLZs0bV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729737AbgG0QZx (ORCPT ); Mon, 27 Jul 2020 12:25:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56650 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728398AbgG0QZw (ORCPT ); Mon, 27 Jul 2020 12:25:52 -0400 Received: from mail-wr1-x444.google.com (mail-wr1-x444.google.com [IPv6:2a00:1450:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4D52DC061794 for ; Mon, 27 Jul 2020 09:25:52 -0700 (PDT) Received: by mail-wr1-x444.google.com with SMTP id r4so12542555wrx.9 for ; Mon, 27 Jul 2020 09:25:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=message-id:in-reply-to:references:from:date:subject:fcc :content-transfer-encoding:mime-version:to:cc; bh=VWyfqfXB4/2Pr3OnBVHnctPYhvvza3eSagW1E67mmyY=; b=WtLZs0bViAiuNZnk4yL/BEDOS+IvutVfdIcHNupv3TBxTR0dv6OzMZbU3cEgBoc8Vr FKc1ah8Q9lyZG48innn3W8TS3HnwkUoq9XQl1xgEYJXLOdRzP3KPm/UA8ORULq2LTpEg +otFmmqy0hPmNgb3zE+xM9hLs+zFRD+NeABzuTYxiFOHGMQezbH3uTnW1C5FXGsQN1Hk i1oGpY9No7L0R5TM757fKrhh9yMX8nwMQ/sEeJ5rAYiur2bZ1cc3YEI5Bt4JtppN7yb8 TVEU4YOTUE7AgqchbuNh4hnEscDB65WXPV/UHwrXgzqvWutVZFCCl+HSJvQOGc3Wb1RI L68w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:in-reply-to:references:from:date :subject:fcc:content-transfer-encoding:mime-version:to:cc; bh=VWyfqfXB4/2Pr3OnBVHnctPYhvvza3eSagW1E67mmyY=; b=g9qGD1Wvmvza3J5EE4AhcX+PPJhKL8h3BGpOM1WSgl3d7sZPbkzsq+tTuJwaucR5iH JIIn/OqLHv+9HH8Bpdl4VhSAPr4WpJ42tqWig6GQ9u0HUCBUq9umkcMCh/o0FkVfZHBp UCQ5CLeRkw7qtgVj7VNzn2RUJgXSg9F0wFFHAr5lRthsP+QvezQJbifg6CVsxywFB0tV PvKsJvTGVX5sQqmQne/DlTYJytteOjxdm0psmHEjZJNeVkz8dtlbs+4kzBkhLlz9hYOg 55utv1k137r4JT7stZ0k3Zdfdc3dcZS8a/Xd5IqaENK77vsv8Gkg9uryaVdJ1141aC8o kQnQ== X-Gm-Message-State: AOAM533m7+O+W11Qo5L/RO1dVpFOvpPYcOx5t+7z3hAq8r7tKHj8epud KGjNqFneC/offH6ON/mlsSdhIurM X-Google-Smtp-Source: ABdhPJxfuM930RYPuemw1iiXFC8scQbIndNEc058Mdu88g17w9VpPIrAsXEBiJs9FGDZDwFXLbCrKA== X-Received: by 2002:adf:e94a:: with SMTP id m10mr8711906wrn.249.1595867150727; Mon, 27 Jul 2020 09:25:50 -0700 (PDT) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id j8sm13752947wrd.85.2020.07.27.09.25.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Jul 2020 09:25:50 -0700 (PDT) Message-Id: In-Reply-To: References: From: "Han-Wen Nienhuys via GitGitGadget" Date: Mon, 27 Jul 2020 16:25:46 +0000 Subject: [PATCH v4 2/3] Modify pseudo refs through ref backend storage Fcc: Sent MIME-Version: 1.0 To: git@vger.kernel.org Cc: Han-Wen Nienhuys , Han-Wen Nienhuys Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Han-Wen Nienhuys The previous behavior was introduced in commit 74ec19d4be ("pseudorefs: create and use pseudoref update and delete functions", Jul 31, 2015), with the justification "alternate ref backends still need to store pseudorefs in GIT_DIR". Refs such as REBASE_HEAD are read through the ref backend. This can only work consistently if they are written through the ref backend as well. Tooling that works directly on files under .git should be updated to use git commands to read refs instead. The following behaviors change: * Updates to pseudorefs (eg. ORIG_HEAD) with core.logAllRefUpdates=always will create reflogs for the pseudoref. * non-HEAD pseudoref symrefs are also dereferenced on deletion. Update t1405 accordingly. Signed-off-by: Han-Wen Nienhuys --- Documentation/git-update-ref.txt | 13 ++-- refs.c | 120 ++----------------------------- t/t1400-update-ref.sh | 10 +-- t/t1405-main-ref-store.sh | 5 +- 4 files changed, 23 insertions(+), 125 deletions(-) diff --git a/Documentation/git-update-ref.txt b/Documentation/git-update-ref.txt index 3e737c2360..d401234b03 100644 --- a/Documentation/git-update-ref.txt +++ b/Documentation/git-update-ref.txt @@ -148,12 +148,13 @@ still see a subset of the modifications. LOGGING UPDATES --------------- -If config parameter "core.logAllRefUpdates" is true and the ref is one under -"refs/heads/", "refs/remotes/", "refs/notes/", or the symbolic ref HEAD; or -the file "$GIT_DIR/logs/" exists then `git update-ref` will append -a line to the log file "$GIT_DIR/logs/" (dereferencing all -symbolic refs before creating the log name) describing the change -in ref value. Log lines are formatted as: +If config parameter "core.logAllRefUpdates" is true and the ref is one +under "refs/heads/", "refs/remotes/", "refs/notes/", or a pseudoref +like HEAD or ORIG_HEAD; or the file "$GIT_DIR/logs/" exists then +`git update-ref` will append a line to the log file +"$GIT_DIR/logs/" (dereferencing all symbolic refs before creating +the log name) describing the change in ref value. Log lines are +formatted as: oldsha1 SP newsha1 SP committer LF diff --git a/refs.c b/refs.c index 639cba93b4..d676acb1f4 100644 --- a/refs.c +++ b/refs.c @@ -771,102 +771,6 @@ long get_files_ref_lock_timeout_ms(void) return timeout_ms; } -static int write_pseudoref(const char *pseudoref, const struct object_id *oid, - const struct object_id *old_oid, struct strbuf *err) -{ - const char *filename; - int fd; - struct lock_file lock = LOCK_INIT; - struct strbuf buf = STRBUF_INIT; - int ret = -1; - - if (!oid) - return 0; - - strbuf_addf(&buf, "%s\n", oid_to_hex(oid)); - - filename = git_path("%s", pseudoref); - fd = hold_lock_file_for_update_timeout(&lock, filename, 0, - get_files_ref_lock_timeout_ms()); - if (fd < 0) { - strbuf_addf(err, _("could not open '%s' for writing: %s"), - filename, strerror(errno)); - goto done; - } - - if (old_oid) { - struct object_id actual_old_oid; - - if (read_ref(pseudoref, &actual_old_oid)) { - if (!is_null_oid(old_oid)) { - strbuf_addf(err, _("could not read ref '%s'"), - pseudoref); - rollback_lock_file(&lock); - goto done; - } - } else if (is_null_oid(old_oid)) { - strbuf_addf(err, _("ref '%s' already exists"), - pseudoref); - rollback_lock_file(&lock); - goto done; - } else if (!oideq(&actual_old_oid, old_oid)) { - strbuf_addf(err, _("unexpected object ID when writing '%s'"), - pseudoref); - rollback_lock_file(&lock); - goto done; - } - } - - if (write_in_full(fd, buf.buf, buf.len) < 0) { - strbuf_addf(err, _("could not write to '%s'"), filename); - rollback_lock_file(&lock); - goto done; - } - - commit_lock_file(&lock); - ret = 0; -done: - strbuf_release(&buf); - return ret; -} - -static int delete_pseudoref(const char *pseudoref, const struct object_id *old_oid) -{ - const char *filename; - - filename = git_path("%s", pseudoref); - - if (old_oid && !is_null_oid(old_oid)) { - struct lock_file lock = LOCK_INIT; - int fd; - struct object_id actual_old_oid; - - fd = hold_lock_file_for_update_timeout( - &lock, filename, 0, - get_files_ref_lock_timeout_ms()); - if (fd < 0) { - error_errno(_("could not open '%s' for writing"), - filename); - return -1; - } - if (read_ref(pseudoref, &actual_old_oid)) - die(_("could not read ref '%s'"), pseudoref); - if (!oideq(&actual_old_oid, old_oid)) { - error(_("unexpected object ID when deleting '%s'"), - pseudoref); - rollback_lock_file(&lock); - return -1; - } - - unlink(filename); - rollback_lock_file(&lock); - } else { - unlink(filename); - } - - return 0; -} - int refs_delete_ref(struct ref_store *refs, const char *msg, const char *refname, const struct object_id *old_oid, @@ -875,11 +779,6 @@ int refs_delete_ref(struct ref_store *refs, const char *msg, struct ref_transaction *transaction; struct strbuf err = STRBUF_INIT; - if (ref_type(refname) == REF_TYPE_PSEUDOREF) { - assert(refs == get_main_ref_store(the_repository)); - return delete_pseudoref(refname, old_oid); - } - transaction = ref_store_transaction_begin(refs, &err); if (!transaction || ref_transaction_delete(transaction, refname, old_oid, @@ -1202,18 +1101,13 @@ int refs_update_ref(struct ref_store *refs, const char *msg, struct strbuf err = STRBUF_INIT; int ret = 0; - if (ref_type(refname) == REF_TYPE_PSEUDOREF) { - assert(refs == get_main_ref_store(the_repository)); - ret = write_pseudoref(refname, new_oid, old_oid, &err); - } else { - t = ref_store_transaction_begin(refs, &err); - if (!t || - ref_transaction_update(t, refname, new_oid, old_oid, - flags, msg, &err) || - ref_transaction_commit(t, &err)) { - ret = 1; - ref_transaction_free(t); - } + t = ref_store_transaction_begin(refs, &err); + if (!t || + ref_transaction_update(t, refname, new_oid, old_oid, flags, msg, + &err) || + ref_transaction_commit(t, &err)) { + ret = 1; + ref_transaction_free(t); } if (ret) { const char *str = _("update_ref failed for ref '%s': %s"); diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh index 7414b898f8..65d349fb33 100755 --- a/t/t1400-update-ref.sh +++ b/t/t1400-update-ref.sh @@ -160,10 +160,10 @@ test_expect_success 'core.logAllRefUpdates=always creates reflog by default' ' git reflog exists $outside ' -test_expect_success 'core.logAllRefUpdates=always creates no reflog for ORIG_HEAD' ' +test_expect_success 'core.logAllRefUpdates=always creates reflog for ORIG_HEAD' ' test_config core.logAllRefUpdates always && git update-ref ORIG_HEAD $A && - test_must_fail git reflog exists ORIG_HEAD + git reflog exists ORIG_HEAD ' test_expect_success '--no-create-reflog overrides core.logAllRefUpdates=always' ' @@ -476,7 +476,7 @@ test_expect_success 'git cat-file blob master@{2005-05-26 23:42}:F (expect OTHER test_expect_success 'given old value for missing pseudoref, do not create' ' test_must_fail git update-ref PSEUDOREF $A $B 2>err && test_must_fail git rev-parse PSEUDOREF && - test_i18ngrep "could not read ref" err + test_i18ngrep "unable to resolve reference" err ' test_expect_success 'create pseudoref' ' @@ -497,7 +497,7 @@ test_expect_success 'overwrite pseudoref with correct old value' ' test_expect_success 'do not overwrite pseudoref with wrong old value' ' test_must_fail git update-ref PSEUDOREF $D $E 2>err && test $C = $(git rev-parse PSEUDOREF) && - test_i18ngrep "unexpected object ID" err + test_i18ngrep "cannot lock ref.*expected" err ' test_expect_success 'delete pseudoref' ' @@ -509,7 +509,7 @@ test_expect_success 'do not delete pseudoref with wrong old value' ' git update-ref PSEUDOREF $A && test_must_fail git update-ref -d PSEUDOREF $B 2>err && test $A = $(git rev-parse PSEUDOREF) && - test_i18ngrep "unexpected object ID" err + test_i18ngrep "cannot lock ref.*expected" err ' test_expect_success 'delete pseudoref with correct old value' ' diff --git a/t/t1405-main-ref-store.sh b/t/t1405-main-ref-store.sh index 331899ddc4..74af927fba 100755 --- a/t/t1405-main-ref-store.sh +++ b/t/t1405-main-ref-store.sh @@ -31,7 +31,10 @@ test_expect_success 'create_symref(FOO, refs/heads/master)' ' test_expect_success 'delete_refs(FOO, refs/tags/new-tag)' ' git rev-parse FOO -- && git rev-parse refs/tags/new-tag -- && - $RUN delete-refs 0 nothing FOO refs/tags/new-tag && + m=$(git rev-parse master) && + REF_NO_DEREF=1 && + $RUN delete-refs $REF_NO_DEREF nothing FOO refs/tags/new-tag && + test_must_fail git rev-parse --symbolic-full-name FOO && test_must_fail git rev-parse FOO -- && test_must_fail git rev-parse refs/tags/new-tag -- '