From patchwork Tue Jan 5 13:08:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Derrick Stolee X-Patchwork-Id: 11998839 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A4B51C433E9 for ; Tue, 5 Jan 2021 13:09:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 76D8122B30 for ; Tue, 5 Jan 2021 13:09:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729730AbhAENJR (ORCPT ); Tue, 5 Jan 2021 08:09:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44212 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727397AbhAENJP (ORCPT ); Tue, 5 Jan 2021 08:09:15 -0500 Received: from mail-wr1-x435.google.com (mail-wr1-x435.google.com [IPv6:2a00:1450:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 32A39C061796 for ; Tue, 5 Jan 2021 05:08:35 -0800 (PST) Received: by mail-wr1-x435.google.com with SMTP id i9so36125317wrc.4 for ; Tue, 05 Jan 2021 05:08:35 -0800 (PST) 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:mime-version :content-transfer-encoding:fcc:to:cc; bh=SfeZtHvAZcdKjf4/1ooSPlrX3oyoViFaD4G679ZrPiE=; b=CbUqx0Ar0Lmmnf9N57GryIrSBIrQlaQ7rG9wIgwlX8Kl1U9rDTrj4d06+/TePW7o4L 7NQVB8PLv58YS6MeJlMtd0Y9ZDAXYcVZ23mEDR1NQsVYIud+QSvOZn3HigLWx8caaNe3 UppYVkZd2GTRg8iZ1rjwy9IKFg5D52vQPh/U4Btzu5A7GM6hhXFOCqHmu6bPpd8JHvR4 fDj0Oo9u6SV1X4YJ6vF9gdR0o3PGpfO8o3gP2qVlXuvJapGf1A1KrI+NKcoIAezZOZgx fWn54WGDrJLZyd+ZVYmpejRx8Uka5qxDYBRyXGHiuADCCklg4+K+9BBhUrICwiRE4aAM 5iMQ== 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:mime-version:content-transfer-encoding:fcc:to:cc; bh=SfeZtHvAZcdKjf4/1ooSPlrX3oyoViFaD4G679ZrPiE=; b=nuyU4mlGzoRGvizP6E6lFYwNLirij8eRXQhhAivXvdhzUzjZEp7+SoG1Zgk8UXshSW jZZKEdKftcdp0riEG23YAO5x+xMrwwSkThjVRXNyNPOPmowdOA+aivb3y7Qjy4JZ/j5c pf/0R08MUwGkO/F4fKmzgGipMPrNvNbRteu/IzbhMdY49yA3+oUSAQPx4xLVM96DJgxO sy1x+L5StWRMhabKrcDRxbzDdL2fHdj1HRQP9tkxt3lCLJqoEtOwYy3AL7mKf2ppYPEv zplBPMsgNxsXkr0huNoFc4MhwO/T2XUfklm6Yjr+gcGdpXegWHRQE9M2g5LJTnHV9huq QfWA== X-Gm-Message-State: AOAM530OBsEePU5k8sXJcOXIG+3yBf31yk8ODwmyIOnJ76UfdaDu1jGU EyhSAXDAyqgCjNlSO15Zbfn7jNSoEEk= X-Google-Smtp-Source: ABdhPJxnu3VR/87c3HhuKbXPO2zm9Lge7iRAP//rDUV2AtLtzu3nTJKnPJfQI03PJxJI47m5TW15xg== X-Received: by 2002:a5d:47a5:: with SMTP id 5mr86587262wrb.109.1609852113340; Tue, 05 Jan 2021 05:08:33 -0800 (PST) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id d191sm3764556wmd.24.2021.01.05.05.08.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Jan 2021 05:08:32 -0800 (PST) Message-Id: <3576c7aa54e08c11ac86675ca9bc11b80366d390.1609852109.git.gitgitgadget@gmail.com> In-Reply-To: References: Date: Tue, 05 Jan 2021 13:08:27 +0000 Subject: [PATCH v7 3/4] maintenance: use launchctl on macOS MIME-Version: 1.0 Fcc: Sent To: git@vger.kernel.org Cc: Eric Sunshine , Derrick Stolee , Derrick Stolee , Derrick Stolee Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Derrick Stolee From: Derrick Stolee The existing mechanism for scheduling background maintenance is done through cron. The 'crontab -e' command allows updating the schedule while cron itself runs those commands. While this is technically supported by macOS, it has some significant deficiencies: 1. Every run of 'crontab -e' must request elevated privileges through the user interface. When running 'git maintenance start' from the Terminal app, it presents a dialog box saying "Terminal.app would like to administer your computer. Administration can include modifying passwords, networking, and system settings." This is more alarming than what we are hoping to achieve. If this alert had some information about how "git" is trying to run "crontab" then we would have some reason to believe that this dialog might be fine. However, it also doesn't help that some scenarios just leave Git waiting for a response without presenting anything to the user. I experienced this when executing the command from a Bash terminal view inside Visual Studio Code. 2. While cron initializes a user environment enough for "git config --global --show-origin" to show the correct config file information, it does not set up the environment enough for Git Credential Manager Core to load credentials during a 'prefetch' task. My prefetches against private repositories required re-authenticating through UI pop-ups in a way that should not be required. The solution is to switch from cron to the Apple-recommended [1] 'launchd' tool. [1] https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPSystemStartup/Chapters/ScheduledJobs.html The basics of this tool is that we need to create XML-formatted "plist" files inside "~/Library/LaunchAgents/" and then use the 'launchctl' tool to make launchd aware of them. The plist files include all of the scheduling information, along with the command-line arguments split across an array of tags. For example, here is my plist file for the weekly scheduled tasks: Labelorg.git-scm.git.weekly ProgramArguments /usr/local/libexec/git-core/git --exec-path=/usr/local/libexec/git-core for-each-repo --config=maintenance.repo maintenance run --schedule=weekly StartCalendarInterval Day0 Hour0 Minute0 The schedules for the daily and hourly tasks are more complicated since we need to use an array for the StartCalendarInterval with an entry for each of the six days other than the 0th day (to avoid colliding with the weekly task), and each of the 23 hours other than the 0th hour (to avoid colliding with the daily task). The "Label" value is currently filled with "org.git-scm.git.X" where X is the frequency. We need a different plist file for each frequency. The launchctl command needs to be aligned with a user id in order to initialize the command environment. This must be done using the 'launchctl bootstrap' subcommand. This subcommand is new as of macOS 10.11, which was released in September 2015. Before that release the 'launchctl load' subcommand was recommended. The best source of information on this transition I have seen is available at [2]. The current design does not preclude a future version that detects the available fatures of 'launchctl' to use the older commands. However, it is best to rely on the newest version since Apple might completely remove the deprecated version on short notice. [2] https://babodee.wordpress.com/2016/04/09/launchctl-2-0-syntax/ To remove a schedule, we must run 'launchctl bootout' with a valid plist file. We also need to 'bootout' a task before the 'bootstrap' subcommand will succeed, if such a task already exists. The need for a user id requires us to run 'id -u' which works on POSIX systems but not Windows. Further, the need for fully-qualitifed path names including $HOME behaves differently in the Git internals and the external test suite. The $HOME variable starts with "C:\..." instead of the "/c/..." that is provided by Git in these subcommands. The test therefore has a prerequisite that we are not on Windows. The cross- platform logic still allows us to test the macOS logic on a Linux machine. We can verify the commands that were run by 'git maintenance start' and 'git maintenance stop' by injecting a script that writes the command-line arguments into GIT_TEST_MAINT_SCHEDULER. An earlier version of this patch accidentally had an opening "" tag when it should have had a closing "" tag. This was caught during manual testing with actual 'launchctl' commands, but we do not want to update developers' tasks when running tests. It appears that macOS includes the "xmllint" tool which can verify the XML format. This is useful for any system that might contain the tool, so use it whenever it is available. We strive to make these tests work on all platforms, but Windows caused some headaches. In particular, the value of getuid() called by the C code is not guaranteed to be the same as `$(id -u)` invoked by a test. This is because `git.exe` is a native Windows program, whereas the utility programs run by the test script mostly utilize the MSYS2 runtime, which emulates a POSIX-like environment. Since the purpose of the test is to check that the input to the hook is well-formed, the actual user ID is immaterial, thus we can work around the problem by making the the test UID-agnostic. Another subtle issue is the $HOME environment variable being a Windows-style path instead of a Unix-style path. We can be more flexible here instead of expecting exact path matches. Helped-by: Ævar Arnfjörð Bjarmason Co-authored-by: Eric Sunshine Signed-off-by: Eric Sunshine Signed-off-by: Derrick Stolee --- Documentation/git-maintenance.txt | 40 +++++++ builtin/gc.c | 188 +++++++++++++++++++++++++++++- t/t7900-maintenance.sh | 59 ++++++++++ 3 files changed, 286 insertions(+), 1 deletion(-) diff --git a/Documentation/git-maintenance.txt b/Documentation/git-maintenance.txt index 1aa11124186..5f8f63f0988 100644 --- a/Documentation/git-maintenance.txt +++ b/Documentation/git-maintenance.txt @@ -273,6 +273,46 @@ schedule to ensure you are executing the correct binaries in your schedule. +BACKGROUND MAINTENANCE ON MACOS SYSTEMS +--------------------------------------- + +While macOS technically supports `cron`, using `crontab -e` requires +elevated privileges and the executed process does not have a full user +context. Without a full user context, Git and its credential helpers +cannot access stored credentials, so some maintenance tasks are not +functional. + +Instead, `git maintenance start` interacts with the `launchctl` tool, +which is the recommended way to schedule timed jobs in macOS. Scheduling +maintenance through `git maintenance (start|stop)` requires some +`launchctl` features available only in macOS 10.11 or later. + +Your user-specific scheduled tasks are stored as XML-formatted `.plist` +files in `~/Library/LaunchAgents/`. You can see the currently-registered +tasks using the following command: + +----------------------------------------------------------------------- +$ ls ~/Library/LaunchAgents/org.git-scm.git* +org.git-scm.git.daily.plist +org.git-scm.git.hourly.plist +org.git-scm.git.weekly.plist +----------------------------------------------------------------------- + +One task is registered for each `--schedule=` option. To +inspect how the XML format describes each schedule, open one of these +`.plist` files in an editor and inspect the `` element following +the `StartCalendarInterval` element. + +`git maintenance start` will overwrite these files and register the +tasks again with `launchctl`, so any customizations should be done by +creating your own `.plist` files with distinct names. Similarly, the +`git maintenance stop` command will unregister the tasks with `launchctl` +and delete the `.plist` files. + +To create more advanced customizations to your background tasks, see +launchctl.plist(5) for more information. + + GIT --- Part of the linkgit:git[1] suite diff --git a/builtin/gc.c b/builtin/gc.c index 18ae7f7138a..782769f2438 100644 --- a/builtin/gc.c +++ b/builtin/gc.c @@ -1491,6 +1491,186 @@ static int maintenance_unregister(void) return run_command(&config_unset); } +static const char *get_frequency(enum schedule_priority schedule) +{ + switch (schedule) { + case SCHEDULE_HOURLY: + return "hourly"; + case SCHEDULE_DAILY: + return "daily"; + case SCHEDULE_WEEKLY: + return "weekly"; + default: + BUG("invalid schedule %d", schedule); + } +} + +static char *launchctl_service_name(const char *frequency) +{ + struct strbuf label = STRBUF_INIT; + strbuf_addf(&label, "org.git-scm.git.%s", frequency); + return strbuf_detach(&label, NULL); +} + +static char *launchctl_service_filename(const char *name) +{ + char *expanded; + struct strbuf filename = STRBUF_INIT; + strbuf_addf(&filename, "~/Library/LaunchAgents/%s.plist", name); + + expanded = expand_user_path(filename.buf, 1); + if (!expanded) + die(_("failed to expand path '%s'"), filename.buf); + + strbuf_release(&filename); + return expanded; +} + +static char *launchctl_get_uid(void) +{ + return xstrfmt("gui/%d", getuid()); +} + +static int launchctl_boot_plist(int enable, const char *filename, const char *cmd) +{ + int result; + struct child_process child = CHILD_PROCESS_INIT; + char *uid = launchctl_get_uid(); + + strvec_split(&child.args, cmd); + if (enable) + strvec_push(&child.args, "bootstrap"); + else + strvec_push(&child.args, "bootout"); + strvec_push(&child.args, uid); + strvec_push(&child.args, filename); + + child.no_stderr = 1; + child.no_stdout = 1; + + if (start_command(&child)) + die(_("failed to start launchctl")); + + result = finish_command(&child); + + free(uid); + return result; +} + +static int launchctl_remove_plist(enum schedule_priority schedule, const char *cmd) +{ + const char *frequency = get_frequency(schedule); + char *name = launchctl_service_name(frequency); + char *filename = launchctl_service_filename(name); + int result = launchctl_boot_plist(0, filename, cmd); + unlink(filename); + free(filename); + free(name); + return result; +} + +static int launchctl_remove_plists(const char *cmd) +{ + return launchctl_remove_plist(SCHEDULE_HOURLY, cmd) || + launchctl_remove_plist(SCHEDULE_DAILY, cmd) || + launchctl_remove_plist(SCHEDULE_WEEKLY, cmd); +} + +static int launchctl_schedule_plist(const char *exec_path, enum schedule_priority schedule, const char *cmd) +{ + FILE *plist; + int i; + const char *preamble, *repeat; + const char *frequency = get_frequency(schedule); + char *name = launchctl_service_name(frequency); + char *filename = launchctl_service_filename(name); + + if (safe_create_leading_directories(filename)) + die(_("failed to create directories for '%s'"), filename); + plist = xfopen(filename, "w"); + + preamble = "\n" + "\n" + "" + "\n" + "Label%s\n" + "ProgramArguments\n" + "\n" + "%s/git\n" + "--exec-path=%s\n" + "for-each-repo\n" + "--config=maintenance.repo\n" + "maintenance\n" + "run\n" + "--schedule=%s\n" + "\n" + "StartCalendarInterval\n" + "\n"; + fprintf(plist, preamble, name, exec_path, exec_path, frequency); + + switch (schedule) { + case SCHEDULE_HOURLY: + repeat = "\n" + "Hour%d\n" + "Minute0\n" + "\n"; + for (i = 1; i <= 23; i++) + fprintf(plist, repeat, i); + break; + + case SCHEDULE_DAILY: + repeat = "\n" + "Day%d\n" + "Hour0\n" + "Minute0\n" + "\n"; + for (i = 1; i <= 6; i++) + fprintf(plist, repeat, i); + break; + + case SCHEDULE_WEEKLY: + fprintf(plist, + "\n" + "Day0\n" + "Hour0\n" + "Minute0\n" + "\n"); + break; + + default: + /* unreachable */ + break; + } + fprintf(plist, "\n\n\n"); + fclose(plist); + + /* bootout might fail if not already running, so ignore */ + launchctl_boot_plist(0, filename, cmd); + if (launchctl_boot_plist(1, filename, cmd)) + die(_("failed to bootstrap service %s"), filename); + + free(filename); + free(name); + return 0; +} + +static int launchctl_add_plists(const char *cmd) +{ + const char *exec_path = git_exec_path(); + + return launchctl_schedule_plist(exec_path, SCHEDULE_HOURLY, cmd) || + launchctl_schedule_plist(exec_path, SCHEDULE_DAILY, cmd) || + launchctl_schedule_plist(exec_path, SCHEDULE_WEEKLY, cmd); +} + +static int launchctl_update_schedule(int run_maintenance, int fd, const char *cmd) +{ + if (run_maintenance) + return launchctl_add_plists(cmd); + else + return launchctl_remove_plists(cmd); +} + #define BEGIN_LINE "# BEGIN GIT MAINTENANCE SCHEDULE" #define END_LINE "# END GIT MAINTENANCE SCHEDULE" @@ -1579,7 +1759,11 @@ static int crontab_update_schedule(int run_maintenance, int fd, const char *cmd) return result; } +#if defined(__APPLE__) +static const char platform_scheduler[] = "launchctl"; +#else static const char platform_scheduler[] = "crontab"; +#endif static int update_background_schedule(int enable) { @@ -1603,7 +1787,9 @@ static int update_background_schedule(int enable) if (hold_lock_file_for_update(&lk, lock_path, LOCK_NO_DEREF) < 0) return error(_("another process is scheduling background maintenance")); - if (!strcmp(scheduler, "crontab")) + if (!strcmp(scheduler, "launchctl")) + result = launchctl_update_schedule(enable, lk.tempfile->fd, cmd); + else if (!strcmp(scheduler, "crontab")) result = crontab_update_schedule(enable, lk.tempfile->fd, cmd); else die("unknown background scheduler: %s", scheduler); diff --git a/t/t7900-maintenance.sh b/t/t7900-maintenance.sh index eeb939168da..adf24dee72d 100755 --- a/t/t7900-maintenance.sh +++ b/t/t7900-maintenance.sh @@ -7,6 +7,19 @@ test_description='git maintenance builtin' GIT_TEST_COMMIT_GRAPH=0 GIT_TEST_MULTI_PACK_INDEX=0 +test_lazy_prereq XMLLINT ' + xmllint --version +' + +test_xmllint () { + if test_have_prereq XMLLINT + then + xmllint --noout "$@" + else + true + fi +} + test_expect_success 'help text' ' test_expect_code 129 git maintenance -h 2>err && test_i18ngrep "usage: git maintenance " err && @@ -395,6 +408,52 @@ test_expect_success 'start preserves existing schedule' ' grep "Important information!" cron.txt ' +test_expect_success 'start and stop macOS maintenance' ' + # ensure $HOME can be compared against hook arguments on all platforms + pfx=$(cd "$HOME" && pwd) && + + write_script print-args <<-\EOF && + echo $* | sed "s:gui/[0-9][0-9]*:gui/[UID]:" >>args + EOF + + rm -f args && + GIT_TEST_MAINT_SCHEDULER=launchctl:./print-args git maintenance start && + + # start registers the repo + git config --get --global maintenance.repo "$(pwd)" && + + ls "$HOME/Library/LaunchAgents" >actual && + cat >expect <<-\EOF && + org.git-scm.git.daily.plist + org.git-scm.git.hourly.plist + org.git-scm.git.weekly.plist + EOF + test_cmp expect actual && + + rm -f expect && + for frequency in hourly daily weekly + do + PLIST="$pfx/Library/LaunchAgents/org.git-scm.git.$frequency.plist" && + test_xmllint "$PLIST" && + grep schedule=$frequency "$PLIST" && + echo "bootout gui/[UID] $PLIST" >>expect && + echo "bootstrap gui/[UID] $PLIST" >>expect || return 1 + done && + test_cmp expect args && + + rm -f args && + GIT_TEST_MAINT_SCHEDULER=launchctl:./print-args git maintenance stop && + + # stop does not unregister the repo + git config --get --global maintenance.repo "$(pwd)" && + + printf "bootout gui/[UID] $pfx/Library/LaunchAgents/org.git-scm.git.%s.plist\n" \ + hourly daily weekly >expect && + test_cmp expect args && + ls "$HOME/Library/LaunchAgents" >actual && + test_line_count = 0 actual +' + test_expect_success 'register preserves existing strategy' ' git config maintenance.strategy none && git maintenance register &&