Fix backend rewrite

[StoneMoe]

Description

• Remove frontend reference in backend code, which is overlooked during backend rewrite.
• Fix Manager singleton implement

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.
Provide instructions so we can reproduce.

• tested locally

[github-actions]

Pylint result on modfied files:

************* Module bottles.frontend.views.importer
bottles/frontend/views/importer.py:29:0: W1405: Quote delimiter ' is inconsistent with the rest of the file (inconsistent-quotes)
bottles/frontend/views/importer.py:31:0: W1405: Quote delimiter ' is inconsistent with the rest of the file (inconsistent-quotes)
bottles/frontend/views/importer.py:20:0: E0611: No name 'Adw' in module 'gi.repository' (no-name-in-module)
bottles/frontend/views/importer.py:65:27: W0613: Unused argument 'error' (unused-argument)
bottles/frontend/views/importer.py:90:31: W0613: Unused argument 'error' (unused-argument)
bottles/frontend/views/importer.py:123:8: W0622: Redefining built-in 'filter' (redefined-builtin)
bottles/frontend/views/importer.py:30:0: R0903: Too few public methods (1/2) (too-few-public-methods)
************* Module bottles.backend.repos.repo
bottles/backend/repos/repo.py:37:32: W0613: Unused argument 'error' (unused-argument)
bottles/backend/repos/repo.py:50:12: C0103: Variable name "c" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/repos/repo.py:50:16: I1101: Module 'pycurl' has no 'Curl' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/repos/repo.py:61:16: I1101: Module 'pycurl' has no 'error' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/repos/repo.py:69:12: C0103: Variable name "c" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/repos/repo.py:69:16: I1101: Module 'pycurl' has no 'Curl' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/repos/repo.py:82:16: I1101: Module 'pycurl' has no 'error' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/repos/repo.py:30:0: R0903: Too few public methods (1/2) (too-few-public-methods)
************* Module bottles.backend.managers.repository
bottles/backend/managers/repository.py:57:4: R1710: Either all return statements in a function should return an expression, or none of them should. (inconsistent-return-statements)
bottles/backend/managers/repository.py:79:8: C0206: Consider iterating with .items() (consider-using-dict-items)
bottles/backend/managers/repository.py:102:20: C0103: Variable name "c" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/repository.py:102:24: I1101: Module 'pycurl' has no 'Curl' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/managers/repository.py:110:27: I1101: Module 'pycurl' has no 'error' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/managers/repository.py:110:20: C0103: Variable name "e" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/repository.py:128:12: C0103: Variable name "t" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/repository.py:34:0: R0903: Too few public methods (1/2) (too-few-public-methods)
************* Module bottles.backend.managers.dependency
bottles/backend/managers/dependency.py:84:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/dependency.py:102:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/dependency.py:113:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/dependency.py:127:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/dependency.py:142:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/dependency.py:159:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/dependency.py:431:12: C0103: Variable name "d" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/dependency.py:497:15: W0718: Catching too general exception Exception (broad-exception-caught)
bottles/backend/managers/dependency.py:497:8: C0103: Variable name "e" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/dependency.py:574:15: W0718: Catching too general exception Exception (broad-exception-caught)
bottles/backend/managers/dependency.py:548:20: C0103: Variable name "fg" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/dependency.py:574:8: C0103: Variable name "e" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/dependency.py:673:8: C0103: Variable name "rk" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/dependency.py:680:8: C0103: Variable name "rk" doesn't conform to snake_case naming style (invalid-name)
************* Module bottles.backend.managers.backup
bottles/backend/managers/backup.py:107:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/backup.py:116:12: R1703: The if statement can be replaced with 'var = bool(test)' (simplifiable-if-statement)
bottles/backend/managers/backup.py:144:32: W0719: Raising too general exception: Exception (broad-exception-raised)
bottles/backend/managers/backup.py:196:17: W1514: Using open without explicitly specifying an encoding (unspecified-encoding)
bottles/backend/managers/backup.py:201:17: W1514: Using open without explicitly specifying an encoding (unspecified-encoding)
************* Module bottles.backend.managers.installer
bottles/backend/managers/installer.py:408:0: W1405: Quote delimiter ' is inconsistent with the rest of the file (inconsistent-quotes)
bottles/backend/managers/installer.py:410:0: W1405: Quote delimiter ' is inconsistent with the rest of the file (inconsistent-quotes)
bottles/backend/managers/installer.py:410:0: W1405: Quote delimiter ' is inconsistent with the rest of the file (inconsistent-quotes)
bottles/backend/managers/installer.py:451:0: W1405: Quote delimiter ' is inconsistent with the rest of the file (inconsistent-quotes)
bottles/backend/managers/installer.py:102:16: C0103: Variable name "c" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/installer.py:102:20: I1101: Module 'pycurl' has no 'Curl' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/managers/installer.py:104:38: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)
bottles/backend/managers/installer.py:149:16: C0103: Variable name "f" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/installer.py:152:20: C0103: Variable name "f" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/installer.py:163:12: C0103: Variable name "st" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/installer.py:250:8: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)
bottles/backend/managers/installer.py:229:4: R1710: Either all return statements in a function should return an expression, or none of them should. (inconsistent-return-statements)
bottles/backend/managers/installer.py:274:12: C0103: Variable name "d" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/installer.py:302:15: C0103: Variable name "v" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/installer.py:346:4: R0913: Too many arguments (6/5) (too-many-arguments)
bottles/backend/managers/installer.py:433:16: C0103: Variable name "d" doesn't conform to snake_case naming style (invalid-name)
************* Module bottles.backend.managers.manager
bottles/backend/managers/manager.py:1:0: C0302: Too many lines in module (1513/1000) (too-many-lines)
bottles/backend/managers/manager.py:403:0: W1405: Quote delimiter ' is inconsistent with the rest of the file (inconsistent-quotes)
bottles/backend/managers/manager.py:761:0: W1405: Quote delimiter ' is inconsistent with the rest of the file (inconsistent-quotes)
bottles/backend/managers/manager.py:1421:0: W1405: Quote delimiter ' is inconsistent with the rest of the file (inconsistent-quotes)
bottles/backend/managers/manager.py:1421:0: W1405: Quote delimiter ' is inconsistent with the rest of the file (inconsistent-quotes)
bottles/backend/managers/manager.py:149:16: C0103: Variable name "f" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:149:19: C0103: Variable name "t" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:153:16: C0103: Variable name "t" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:161:8: C0103: Variable name "rv" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:166:8: W0106: Expression "self.check_dxvk(install_latest) or rv.set_status(False)" is assigned to nothing (expression-not-assigned)
bottles/backend/managers/manager.py:169:8: W0106: Expression "self.check_vkd3d(install_latest) or rv.set_status(False)" is assigned to nothing (expression-not-assigned)
bottles/backend/managers/manager.py:172:8: W0106: Expression "self.check_nvapi(install_latest) or rv.set_status(False)" is assigned to nothing (expression-not-assigned)
bottles/backend/managers/manager.py:175:8: W0106: Expression "self.check_latencyflex(install_latest) or rv.set_status(False)" is assigned to nothing (expression-not-assigned)
bottles/backend/managers/manager.py:178:8: W0106: Expression "self.check_runtimes(install_latest) or rv.set_status(False)" is assigned to nothing (expression-not-assigned)
bottles/backend/managers/manager.py:181:8: W0106: Expression "self.check_winebridge(install_latest) or rv.set_status(False)" is assigned to nothing (expression-not-assigned)
bottles/backend/managers/manager.py:184:8: W0106: Expression "self.check_runners(install_latest) or rv.set_status(False)" is assigned to nothing (expression-not-assigned)
bottles/backend/managers/manager.py:362:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:366:22: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)
bottles/backend/managers/manager.py:371:31: C0207: Use version.split('\n', maxsplit=1)[0] instead (use-maxsplit-arg)
bottles/backend/managers/manager.py:391:12: C0206: Consider iterating with .items() (consider-using-dict-items)
bottles/backend/managers/manager.py:391:16: C0103: Variable name "r" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:401:25: W1202: Use lazy % or % formatting in logging functions (logging-format-interpolation)
bottles/backend/managers/manager.py:405:8: R1702: Too many nested blocks (6/5) (too-many-nested-blocks)
bottles/backend/managers/manager.py:450:17: W1514: Using open without explicitly specifying an encoding (unspecified-encoding)
bottles/backend/managers/manager.py:450:40: C0103: Variable name "f" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:477:17: W1514: Using open without explicitly specifying an encoding (unspecified-encoding)
bottles/backend/managers/manager.py:477:44: C0103: Variable name "f" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:545:25: W1202: Use lazy % or % formatting in logging functions (logging-format-interpolation)
bottles/backend/managers/manager.py:614:8: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:642:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:659:16: W0702: No exception type(s) specified (bare-except)
bottles/backend/managers/manager.py:732:21: W1514: Using open without explicitly specifying an encoding (unspecified-encoding)
bottles/backend/managers/manager.py:732:48: C0103: Variable name "f" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:793:16: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:806:16: C0103: Variable name "p" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:815:16: C0103: Variable name "c" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:816:16: C0103: Variable name "c" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:839:12: C0103: Variable name "b" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:840:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:847:25: W1202: Use lazy % or % formatting in logging functions (logging-format-interpolation)
bottles/backend/managers/manager.py:856:4: R0913: Too many arguments (7/5) (too-many-arguments)
bottles/backend/managers/manager.py:881:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:918:8: C0206: Consider iterating with .items() (consider-using-dict-items)
bottles/backend/managers/manager.py:919:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:931:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:939:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:944:16: R1721: Unnecessary use of a comprehension, use list(self.dxvk_available) instead. (unnecessary-comprehension)
bottles/backend/managers/manager.py:949:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:954:16: R1721: Unnecessary use of a comprehension, use list(self.vkd3d_available) instead. (unnecessary-comprehension)
bottles/backend/managers/manager.py:959:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:964:16: R1721: Unnecessary use of a comprehension, use list(self.nvapi_available) instead. (unnecessary-comprehension)
bottles/backend/managers/manager.py:972:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:990:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:996:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:1002:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:1009:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:1012:29: C0201: Consider iterating the dictionary directly instead of calling .keys() (consider-iterating-dictionary)
bottles/backend/managers/manager.py:1020:4: R0913: Too many arguments (14/5) (too-many-arguments)
bottles/backend/managers/manager.py:1122:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:1139:8: W0702: No exception type(s) specified (bare-except)
bottles/backend/managers/manager.py:1151:12: W0702: No exception type(s) specified (bare-except)
bottles/backend/managers/manager.py:1148:21: W1514: Using open without explicitly specifying an encoding (unspecified-encoding)
bottles/backend/managers/manager.py:1148:84: C0103: Variable name "f" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:1188:8: C0103: Variable name "rk" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:1198:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/manager.py:1202:15: W0125: Using a conditional statement with a constant value (using-constant-test)
bottles/backend/managers/manager.py:1197:8: R1702: Too many nested blocks (6/5) (too-many-nested-blocks)
bottles/backend/managers/manager.py:1197:8: R1702: Too many nested blocks (7/5) (too-many-nested-blocks)
bottles/backend/managers/manager.py:1197:8: R1702: Too many nested blocks (7/5) (too-many-nested-blocks)
bottles/backend/managers/manager.py:1282:21: W1514: Using open without explicitly specifying an encoding (unspecified-encoding)
bottles/backend/managers/manager.py:1282:54: C0103: Variable name "f" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/manager.py:1435:8: W1510: 'subprocess.run' used without explicitly defining the value for 'check'. (subprocess-run-check)
bottles/backend/managers/manager.py:1474:4: R0913: Too many arguments (7/5) (too-many-arguments)
bottles/backend/managers/manager.py:76:0: R0904: Too many public methods (23/20) (too-many-public-methods)
************* Module bottles.backend.managers.component
bottles/backend/managers/component.py:83:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:120:4: R0913: Too many arguments (6/5) (too-many-arguments)
bottles/backend/managers/component.py:139:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:150:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:157:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:162:12: C0103: Variable name "c" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/component.py:162:16: I1101: Module 'pycurl' has no 'Curl' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/managers/component.py:172:19: I1101: Module 'pycurl' has no 'error' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/managers/component.py:180:16: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:196:20: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:208:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:214:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:257:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:278:16: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:263:18: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)
bottles/backend/managers/component.py:235:16: W0613: Unused argument 'name' (unused-argument)
bottles/backend/managers/component.py:321:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:332:12: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:340:8: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:351:8: W0105: String statement has no effect (pointless-string-statement)
bottles/backend/managers/component.py:451:15: W0718: Catching too general exception Exception (broad-exception-caught)
bottles/backend/managers/component.py:451:8: C0103: Variable name "e" doesn't conform to snake_case naming style (invalid-name)
bottles/backend/managers/component.py:455:8: W0105: String statement has no effect (pointless-string-statement)

[TheEvilSkeleton]

I'm going to wait for Kinsteen to review and merge

[mirkobrombin]

Looks good to me

[TheEvilSkeleton]

(Added Kinsteen as a reviewer as a reminder. Kinsteen, if you're reading this, take your time. It's not meant to pressure you and I apologize if it disturbs you)

[Kinsteen]

Sorry for being this late, but this looks good to me as well!