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maintenance: use random minute in systemd scheduler
The get_random_minute() method was created to allow maintenance schedules to be fixed to a random minute of the hour. This randomness is only intended to spread out the load from a number of clients, but each client should have an hour between each maintenance cycle. Add this random minute to the systemd integration. This integration is more complicated than similar changes for other schedulers because of a neat trick that systemd allows: templating. The previous implementation generated two template files with names of the form 'git-maintenance@.(timer|service)'. The '.timer' or '.service' indicates that this is a template that is picked up when we later specify '...@<schedule>.timer' or '...@<schedule>.service'. The '<schedule>' string is then used to insert into the template both the 'OnCalendar' schedule setting and the '--schedule' parameter of the 'git maintenance run' command. In order to set these schedules to a given minute, we can no longer use the 'hourly', 'daily', or 'weekly' strings for '<schedule>' and instead need to abandon the template model for the .timer files. We can still use templates for the .service files. For this reason, we split these writes into two methods. Modify the template with a custom schedule in the 'OnCalendar' setting. This schedule has some interesting differences from cron-like patterns, but is relatively easy to figure out from context. The one that might be confusing is that '*-*-*' is a date-based pattern, but this must be omitted when using 'Mon' to signal that we care about the day of the week. Monday is used since that matches the day used for the 'weekly' schedule used previously. Now that the timer files are not templates, we might want to abandon the '@' symbol in the file names. However, this would cause users with existing schedules to get two competing schedules due to different names. The work to remove the old schedule name is one thing that we can avoid by keeping the '@' symbol in our unit names. Since we are locked into this name, it makes sense that we keep the template model for the .service files. The rest of the change involves making sure we are writing these .timer and .service files before initializing the schedule with 'systemctl' and deleting the files when we are done. Some changes are also made to share the random minute along with a single computation of the execution path of the current Git executable. In addition, older Git versions may have written a 'git-maintenance@.timer' template file. Be sure to remove this when successfully enabling maintenance (or disabling maintenance). Signed-off-by: Derrick Stolee <derrickstolee@github.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
parent
f44d7d00e5
commit
daa787010c
2 changed files with 145 additions and 28 deletions
158
builtin/gc.c
158
builtin/gc.c
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@ -2292,29 +2292,54 @@ static char *xdg_config_home_systemd(const char *filename)
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return xdg_config_home_for("systemd/user", filename);
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}
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static int systemd_timer_delete_unit_templates(void)
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#define SYSTEMD_UNIT_FORMAT "git-maintenance@%s.%s"
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static int systemd_timer_delete_timer_file(enum schedule_priority priority)
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{
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int ret = 0;
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char *filename = xdg_config_home_systemd("git-maintenance@.timer");
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if (unlink(filename) && !is_missing_file_error(errno))
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ret = error_errno(_("failed to delete '%s'"), filename);
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FREE_AND_NULL(filename);
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const char *frequency = get_frequency(priority);
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char *local_timer_name = xstrfmt(SYSTEMD_UNIT_FORMAT, frequency, "timer");
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char *filename = xdg_config_home_systemd(local_timer_name);
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filename = xdg_config_home_systemd("git-maintenance@.service");
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if (unlink(filename) && !is_missing_file_error(errno))
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ret = error_errno(_("failed to delete '%s'"), filename);
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free(filename);
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free(local_timer_name);
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return ret;
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}
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static int systemd_timer_write_unit_templates(const char *exec_path)
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static int systemd_timer_delete_service_template(void)
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{
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int ret = 0;
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char *local_service_name = xstrfmt(SYSTEMD_UNIT_FORMAT, "", "service");
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char *filename = xdg_config_home_systemd(local_service_name);
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if (unlink(filename) && !is_missing_file_error(errno))
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ret = error_errno(_("failed to delete '%s'"), filename);
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free(filename);
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free(local_service_name);
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return ret;
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}
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/*
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* Write the schedule information into a git-maintenance@<schedule>.timer
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* file using a custom minute. This timer file cannot use the templating
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* system, so we generate a specific file for each.
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*/
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static int systemd_timer_write_timer_file(enum schedule_priority schedule,
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int minute)
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{
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int res = -1;
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char *filename;
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FILE *file;
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const char *unit;
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char *schedule_pattern = NULL;
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const char *frequency = get_frequency(schedule);
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char *local_timer_name = xstrfmt(SYSTEMD_UNIT_FORMAT, frequency, "timer");
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filename = xdg_config_home_systemd(local_timer_name);
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filename = xdg_config_home_systemd("git-maintenance@.timer");
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if (safe_create_leading_directories(filename)) {
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error(_("failed to create directories for '%s'"), filename);
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goto error;
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@ -2323,6 +2348,23 @@ static int systemd_timer_write_unit_templates(const char *exec_path)
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if (!file)
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goto error;
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switch (schedule) {
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case SCHEDULE_HOURLY:
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schedule_pattern = xstrfmt("*-*-* *:%02d:00", minute);
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break;
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case SCHEDULE_DAILY:
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schedule_pattern = xstrfmt("*-*-* 0:%02d:00", minute);
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break;
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case SCHEDULE_WEEKLY:
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schedule_pattern = xstrfmt("Mon 0:%02d:00", minute);
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break;
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default:
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BUG("Unhandled schedule_priority");
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}
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unit = "# This file was created and is maintained by Git.\n"
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"# Any edits made in this file might be replaced in the future\n"
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"# by a Git command.\n"
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@ -2331,12 +2373,12 @@ static int systemd_timer_write_unit_templates(const char *exec_path)
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"Description=Optimize Git repositories data\n"
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"\n"
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"[Timer]\n"
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"OnCalendar=%i\n"
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"OnCalendar=%s\n"
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"Persistent=true\n"
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"\n"
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"[Install]\n"
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"WantedBy=timers.target\n";
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if (fputs(unit, file) == EOF) {
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if (fprintf(file, unit, schedule_pattern) < 0) {
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error(_("failed to write to '%s'"), filename);
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fclose(file);
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goto error;
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@ -2345,9 +2387,36 @@ static int systemd_timer_write_unit_templates(const char *exec_path)
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error_errno(_("failed to flush '%s'"), filename);
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goto error;
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}
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free(filename);
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filename = xdg_config_home_systemd("git-maintenance@.service");
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res = 0;
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error:
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free(schedule_pattern);
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free(local_timer_name);
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free(filename);
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return res;
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}
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/*
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* No matter the schedule, we use the same service and can make use of the
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* templating system. When installing git-maintenance@<schedule>.timer,
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* systemd will notice that git-maintenance@.service exists as a template
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* and will use this file and insert the <schedule> into the template at
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* the position of "%i".
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*/
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static int systemd_timer_write_service_template(const char *exec_path)
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{
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int res = -1;
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char *filename;
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FILE *file;
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const char *unit;
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char *local_service_name = xstrfmt(SYSTEMD_UNIT_FORMAT, "", "service");
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filename = xdg_config_home_systemd(local_service_name);
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if (safe_create_leading_directories(filename)) {
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error(_("failed to create directories for '%s'"), filename);
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goto error;
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}
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file = fopen_or_warn(filename, "w");
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if (!file)
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goto error;
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@ -2380,17 +2449,18 @@ static int systemd_timer_write_unit_templates(const char *exec_path)
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error_errno(_("failed to flush '%s'"), filename);
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goto error;
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}
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free(filename);
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return 0;
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res = 0;
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error:
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free(local_service_name);
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free(filename);
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systemd_timer_delete_unit_templates();
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return -1;
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return res;
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}
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static int systemd_timer_enable_unit(int enable,
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enum schedule_priority schedule)
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enum schedule_priority schedule,
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int minute)
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{
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const char *cmd = "systemctl";
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struct child_process child = CHILD_PROCESS_INIT;
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*/
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if (!enable)
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child.no_stderr = 1;
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else if (systemd_timer_write_timer_file(schedule, minute))
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return -1;
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get_schedule_cmd(&cmd, NULL);
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strvec_split(&child.args, cmd);
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strvec_pushl(&child.args, "--user", enable ? "enable" : "disable",
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"--now", NULL);
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strvec_pushf(&child.args, "git-maintenance@%s.timer", frequency);
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strvec_pushf(&child.args, SYSTEMD_UNIT_FORMAT, frequency, "timer");
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if (start_command(&child))
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return error(_("failed to start systemctl"));
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@ -2429,24 +2501,58 @@ static int systemd_timer_enable_unit(int enable,
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return 0;
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}
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/*
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* A previous version of Git wrote the timer units as template files.
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* Clean these up, if they exist.
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*/
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static void systemd_timer_delete_stale_timer_templates(void)
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{
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char *timer_template_name = xstrfmt(SYSTEMD_UNIT_FORMAT, "", "timer");
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char *filename = xdg_config_home_systemd(timer_template_name);
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if (unlink(filename) && !is_missing_file_error(errno))
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warning(_("failed to delete '%s'"), filename);
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free(filename);
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free(timer_template_name);
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}
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static int systemd_timer_delete_unit_files(void)
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{
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systemd_timer_delete_stale_timer_templates();
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/* Purposefully not short-circuited to make sure all are called. */
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return systemd_timer_delete_timer_file(SCHEDULE_HOURLY) |
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systemd_timer_delete_timer_file(SCHEDULE_DAILY) |
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systemd_timer_delete_timer_file(SCHEDULE_WEEKLY) |
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systemd_timer_delete_service_template();
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}
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static int systemd_timer_delete_units(void)
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{
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return systemd_timer_enable_unit(0, SCHEDULE_HOURLY) ||
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systemd_timer_enable_unit(0, SCHEDULE_DAILY) ||
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systemd_timer_enable_unit(0, SCHEDULE_WEEKLY) ||
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systemd_timer_delete_unit_templates();
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int minute = get_random_minute();
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/* Purposefully not short-circuited to make sure all are called. */
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return systemd_timer_enable_unit(0, SCHEDULE_HOURLY, minute) |
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systemd_timer_enable_unit(0, SCHEDULE_DAILY, minute) |
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systemd_timer_enable_unit(0, SCHEDULE_WEEKLY, minute) |
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systemd_timer_delete_unit_files();
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}
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static int systemd_timer_setup_units(void)
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{
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int minute = get_random_minute();
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const char *exec_path = git_exec_path();
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int ret = systemd_timer_write_unit_templates(exec_path) ||
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systemd_timer_enable_unit(1, SCHEDULE_HOURLY) ||
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systemd_timer_enable_unit(1, SCHEDULE_DAILY) ||
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systemd_timer_enable_unit(1, SCHEDULE_WEEKLY);
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int ret = systemd_timer_write_service_template(exec_path) ||
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systemd_timer_enable_unit(1, SCHEDULE_HOURLY, minute) ||
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systemd_timer_enable_unit(1, SCHEDULE_DAILY, minute) ||
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systemd_timer_enable_unit(1, SCHEDULE_WEEKLY, minute);
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if (ret)
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systemd_timer_delete_units();
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else
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systemd_timer_delete_stale_timer_templates();
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return ret;
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}
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@ -744,7 +744,15 @@ test_expect_success 'start and stop Linux/systemd maintenance' '
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# start registers the repo
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git config --get --global --fixed-value maintenance.repo "$(pwd)" &&
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test_systemd_analyze_verify "systemd/user/git-maintenance@.service" &&
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for schedule in hourly daily weekly
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do
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test_path_is_file "systemd/user/git-maintenance@$schedule.timer" || return 1
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done &&
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test_path_is_file "systemd/user/git-maintenance@.service" &&
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test_systemd_analyze_verify "systemd/user/git-maintenance@hourly.service" &&
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test_systemd_analyze_verify "systemd/user/git-maintenance@daily.service" &&
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test_systemd_analyze_verify "systemd/user/git-maintenance@weekly.service" &&
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printf -- "--user enable --now git-maintenance@%s.timer\n" hourly daily weekly >expect &&
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test_cmp expect args &&
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# stop does not unregister the repo
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git config --get --global --fixed-value maintenance.repo "$(pwd)" &&
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test_path_is_missing "systemd/user/git-maintenance@.timer" &&
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for schedule in hourly daily weekly
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do
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test_path_is_missing "systemd/user/git-maintenance@$schedule.timer" || return 1
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done &&
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test_path_is_missing "systemd/user/git-maintenance@.service" &&
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printf -- "--user disable --now git-maintenance@%s.timer\n" hourly daily weekly >expect &&
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