fix(v3.6.x): properly handling swapfile during persist file handling

[Bodong-Yang]

Description

This PR implements the proper way to create swapfile, and provides a workaround fix in persist file handling to handle swapfile creating.

At the time when persist file mechanism design was proposed by the original developer, handling swapfile was not considered but is wildly used in real world to create swapfile in new slot.
By default direct copy is used to persist file from active slot to standby slot, however for swapfile, direct copy is improper(see https://wiki.archlinux.org/title/swap for the proper way of creating a swapfile) and will cost unnecessary time if the swapfile is huge.

Note

In the upcoming new OTA image spec, we will no-longer handle swapfile in persist file handling hook, but handle it at dedicated hook.

Check list

• test file that covers the bug case(s) is implemented.
• local test is passed.

Bug fix

Behaivor after fix

1. persist file handling(in PROCESS_POSTUPDATE phase) will not take long time if swapfile is huge.
2. swapfile is created by proper method.

Related links & ticket

RT4-8553

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
otaclient/app
__init__.py	0	0	100%
__main__.py	3	3	0%	16–19
common.py	268	14	95%	55, 185, 200, 275–277, 287, 296–298, 404, 416, 535–539
configs.py	76	0	100%
copy_tree.py	81	3	96%	45, 96, 125
downloader.py	271	44	84%	70, 83–84, 299, 304, 308, 326–327, 377–381, 400–410, 431–449, 458, 533–535, 551, 571–589
ecu_info.py	59	7	88%	78–79, 92, 97, 120–121, 130
errors.py	113	0	100%
interface.py	17	4	76%	32, 43, 47, 51
log_setting.py	26	7	73%	27–28, 55–65
main.py	31	2	94%	43–44
ota_client.py	397	148	63%	54–55, 77, 183–207, 244–247, 259–275, 285–288, 294–326, 368–371, 376–383, 396–419, 425–428, 457–481, 495–502, 509, 512–518, 565–568, 576, 612, 617–639, 700–716, 727–743, 754, 773, 784–785, 802, 821, 825–826, 841
ota_client_call.py	38	6	84%	42–44, 80–82
ota_client_service.py	29	3	90%	58–60
ota_client_stub.py	395	108	73%	79–84, 92–102, 106–128, 133–142, 145–152, 160–165, 207–209, 214, 249, 274, 277, 280, 384, 410, 412, 438, 488, 550, 620–621, 660, 680–691, 695–709, 713–716, 775, 862–871, 901–948, 951
ota_metadata.py	315	31	90%	147, 152, 188–189, 199–203, 215, 273, 306–308, 325–328, 408, 411, 419–421, 434, 443–448, 721–732
ota_status.py	15	2	87%	36, 44
proxy_info.py	51	7	86%	82–87, 122–129, 137–138
update_stats.py	105	2	98%	162, 172
otaclient/app/boot_control
__init__.py	4	0	100%
_cboot.py	288	142	51%	82–90, 99–112, 118–121, 125, 132, 136, 140, 144–148, 152–156, 163–175, 178–221, 227, 230, 233, 236, 239, 242, 245, 248–249, 252–253, 256–260, 263–264, 279, 282, 316, 333–336, 349–352, 362–365, 373, 412, 429–432, 441–444, 449–451, 460–466, 469, 476, 506–509, 548–551, 556–567, 572–578
_common.py	369	143	61%	65–74, 83–84, 88–89, 97–98, 109–110, 115–120, 125–130, 139, 148, 152, 156, 160, 174–177, 187–191, 196, 200, 210–214, 222–234, 245–249, 253–257, 269–271, 283–285, 296–310, 320–341, 360–376, 393–404, 412–418, 513–523, 582–583, 637, 641–642, 645, 653–656, 712–713, 716, 730–738, 753–754, 828–831, 852–855, 868–869, 878
_errors.py	47	19	60%	43–69, 89–90
_grub.py	403	114	72%	217, 265–268, 274–278, 315–316, 323–347, 356–362, 371–377, 456–462, 514, 520, 546, 568–573, 588–590, 619–629, 684–690, 709–712, 737–740, 763–766, 808, 814, 834–837, 849, 852, 855, 858, 862–864, 882–885, 913–916, 921–929, 934–942
_rpi_boot.py	266	125	53%	85–87, 93–148, 172–174, 180–182, 195–197, 203–205, 218–243, 248, 252, 256, 260, 294, 324, 327–329, 337, 346–349, 359–362, 366–373, 413–415, 457–461, 480–483, 488, 491, 512–515, 520–528, 533–541, 555–558, 564–566, 569
configs.py	58	2	97%	46–47
firmware.py	32	5	84%	63, 65, 76–78
protocol.py	28	5	82%	53, 57, 61, 65, 73
selecter.py	39	27	31%	45–69, 77–94
otaclient/app/create_standby
__init__.py	12	5	58%	30–36
common.py	216	45	79%	74, 77–78, 82–95, 141, 189–197, 200–203, 207, 218, 292–300, 312, 356–361, 377–378, 392–396, 421–422
interface.py	19	3	84%	55, 59, 63
rebuild_mode.py	89	1	99%	106
otaclient/app/proto
__init__.py	31	3	90%	37, 44–45
_common.py	419	49	88%	85, 163, 170, 182–184, 203, 208, 219, 256, 262, 267, 298, 302, 306, 363, 380, 403, 464, 471, 474, 494, 501, 503, 529, 535, 538, 540, 565, 571, 574, 576, 605, 609, 611, 625, 642, 670, 673, 677, 680, 708, 714, 761–766, 797
_ota_metafiles_wrapper.py	84	13	85%	37, 40–42, 112–116, 122–125
_otaclient_v2_pb2_wrapper.py	276	37	87%	87, 90–93, 132, 175, 183, 197, 207, 210–213, 258, 261, 264–265, 285, 305, 385, 452, 505, 513–515, 519–522, 525–530, 551, 559, 573, 581, 595
streamer.py	43	8	81%	32, 47, 65–66, 71, 80–81, 99
wrapper.py	4	0	100%
otaclient/ota_proxy
__init__.py	46	3	93%	86, 90, 94
__main__.py	22	22	0%	16–79
_consts.py	15	0	100%
cache_control.py	68	4	94%	71, 91, 113, 121
config.py	18	0	100%
db.py	146	15	90%	75, 81, 103, 113–116, 145–147, 166, 199, 208–209, 229, 258, 300
errors.py	10	0	100%
orm.py	115	11	90%	37, 91, 96, 101, 107, 113, 140–141, 154, 231, 235
ota_cache.py	404	75	81%	95–96, 215, 226, 253–255, 275, 291–294, 317–330, 359–363, 379, 440–441, 483–484, 554, 567–570, 620, 639–640, 672–673, 684, 721–728, 735–736, 741–743, 747, 756, 803, 811–813, 892–895, 899–903, 917–934, 965, 971, 998, 1027–1029
server_app.py	138	39	72%	75, 78, 84, 100, 102, 161–170, 212–243, 256–266, 292–298, 312–314, 320–322
utils.py	23	1	96%	31
TOTAL	6022	1307	78%