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maintenance: use random minute in launchctl scheduler

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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.

Use get_random_minute() when constructing the schedules for launchctl.

The format already includes a 'Minute' key which is modified from 0 to
the random minute.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2023-08-10 20:39:41 +00:00 committed by Junio C Hamano
parent 89024a0ab0
commit ec5d9d684c
1 changed files with 12 additions and 11 deletions
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23
builtin/gc.c
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@ -1708,7 +1708,6 @@ static int get_schedule_cmd(const char **cmd, int *is_available)
return 1;
}
MAYBE_UNUSED
static int get_random_minute(void)
{
/* Use a static value when under tests. */
@ -1830,6 +1829,7 @@ static int launchctl_schedule_plist(const char *exec_path, enum schedule_priorit
struct strbuf plist = STRBUF_INIT, plist2 = STRBUF_INIT;
struct stat st;
const char *cmd = "launchctl";
int minute = get_random_minute();
get_schedule_cmd(&cmd, NULL);
preamble = "<?xml version=\"1.0\"?>\n"
@ -1855,29 +1855,30 @@ static int launchctl_schedule_plist(const char *exec_path, enum schedule_priorit
case SCHEDULE_HOURLY:
repeat = "<dict>\n"
"<key>Hour</key><integer>%d</integer>\n"
"<key>Minute</key><integer>0</integer>\n"
"<key>Minute</key><integer>%d</integer>\n"
"</dict>\n";
for (i = 1; i <= 23; i++)
strbuf_addf(&plist, repeat, i);
strbuf_addf(&plist, repeat, i, minute);
break;
case SCHEDULE_DAILY:
repeat = "<dict>\n"
"<key>Day</key><integer>%d</integer>\n"
"<key>Hour</key><integer>0</integer>\n"
"<key>Minute</key><integer>0</integer>\n"
"<key>Minute</key><integer>%d</integer>\n"
"</dict>\n";
for (i = 1; i <= 6; i++)
strbuf_addf(&plist, repeat, i);
strbuf_addf(&plist, repeat, i, minute);
break;
case SCHEDULE_WEEKLY:
strbuf_addstr(&plist,
"<dict>\n"
"<key>Day</key><integer>0</integer>\n"
"<key>Hour</key><integer>0</integer>\n"
"<key>Minute</key><integer>0</integer>\n"
"</dict>\n");
strbuf_addf(&plist,
"<dict>\n"
"<key>Day</key><integer>0</integer>\n"
"<key>Hour</key><integer>0</integer>\n"
"<key>Minute</key><integer>%d</integer>\n"
"</dict>\n",
minute);
break;
default: