升级fedora 24以后，安装软件报错
1Complete! 2Traceback (most recent call last): 3 File "/bin/dnf", line 58, in <module> 4 main.user_main(sys.argv[1:], exit_code=True) 5 File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 174, in user_main 6 errcode = main(args) 7 File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 60, in main 8 return _main(base, args) 9 File "/usr/lib/python3.5/site-packages/dnf/base.py", line 102, in __exit__ 10 self.close() 11 File "/usr/lib/python3.5/site-packages/dnf/base.py", line 283, in close 12 self._tempfile_persistor.get_saved_tempfiles()) 13 File "/usr/lib/python3.5/site-packages/dnf/persistor.py", line 483, in get_saved_tempfiles 14 return self._get_json_db(self.db_path) 15 File "/usr/lib/python3.5/site-packages/dnf/persistor.py", line 425, in _get_json_db 16 default = json.loads(content) 17 File "/usr/lib64/python3.5/json/__init__.py", line 319, in loads 18 return _default_decoder.decode(s) 19 File "/usr/lib64/python3.5/json/decoder.py", line 339, in decode 20 obj, end = self.raw_decode(s, idx=_w(s, 0).end()) 21 File "/usr/lib64/python3.5/json/decoder.py", line 355, in raw_decode 22 obj, end = self.scan_once(s, idx) 23json.decoder.JSONDecodeError: Unterminated string starting at: line 1 column 122871 (char 122870)
跟踪调试代码，/usr/lib64/python3.5/json/decoder.py，line 355 ，添加 print(s)
1345 def raw_decode(self, s, idx=0): 2346 """Decode a JSON document from ``s`` (a ``str`` beginning with 3347 a JSON document) and return a 2-tuple of the Python 4348 representation and the index in ``s`` where the document ended. 5349 6350 This can be used to decode a JSON document from a string that may 7351 have extraneous data at the end. 8352 9353 """ 10354 try: 11355 print(s) 12356 obj, end = self.scan_once(s, idx) 13357 except StopIteration as err: 14358 raise JSONDecodeError("Expecting value", s, err.value) from None 15359 return obj, end
打印内容：
1["/var/lib/dnf/system-upgrade/libteam-1.25-1.fc24.x86_64.rpm", 2 "/var/lib/dnf/system-upgrade/libmetalink-0.1.2-9.fc24.x86_64.rpm", 3"/var/lib/dnf/system-upgrade/xfwm4-4.12.3-3.fc24.x86_64.rpm", 4"/var/lib/dnf/system-upgrade/gnome-font-viewer-3.20.2-1.fc24.x86_64.rpm", 5 "/var/lib/dnf/system-upgrade/jzlib-1.1.3-4.fc24.noarch.rpm", 6"/var/lib/dnf/system-upgrade/libetonyek-0.1.6-4.fc24.x86_64.rpm", 7"/var/lib/dnf/system-upgrade/perl-File-Path-2.12-2.fc24.noarch.rpm", 8 "/var/lib/dnf/system-upgrade/alsa-plugins-pulseaudio-1.1.1-1.fc24.x86_64.rpm", 9"/var/lib/dnf/system-upgrade/python-lxml-3.4.4-4.fc24.x86_64.rpm", 10"/var/lib/dnf/system-upgrade/libreport-2.7.2-1.fc24.x86_64.rpm", 11"/var/lib/dnf/system-upgrade/libffado-2.2.1-8.fc24.x86_64.rpm", 12"/var/lib/dnf/system-upgrade/texlive-kastrup-svn15878.0-24.fc24.1.noarch.rpm", 13"/var/lib/dnf/system-upgrade/zenity-3.20.0-1.fc24.x86_64.rpm", 14 "/var/lib/dnf/system-upgrade/texlive-fpl-svn15878.1.002-24.fc24.1.noarch.rpm", 15"/var/lib/dnf/system-upgrade/texlive-lib-2015-24.20150728_r37987.fc24.x86_64.rpm", "/var/lib/ 16#结尾少了数组的结束符中括号 "]" 17Traceback (most recent call last): 18 File "/bin/dnf", line 58, in <module> 19 main.user_main(sys.argv[1:], exit_code=True) 20 File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 174, in user_main 21 errcode = main(args) 22 File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 60, in main 23 return _main(base, args) 24 File "/usr/lib/python3.5/site-packages/dnf/base.py", line 102, in __exit__ 25 self.close() 26 File "/usr/lib/python3.5/site-packages/dnf/base.py", line 283, in close 27 self._tempfile_persistor.get_saved_tempfiles()) 28 File "/usr/lib/python3.5/site-packages/dnf/persistor.py", line 483, in get_saved_tempfiles 29 return self._get_json_db(self.db_path) 30 File "/usr/lib/python3.5/site-packages/dnf/persistor.py", line 425, in _get_json_db 31 default = json.loads(content) 32 File "/usr/lib64/python3.5/json/__init__.py", line 319, in loads 33 return _default_decoder.decode(s) 34 File "/usr/lib64/python3.5/json/decoder.py", line 339, in decode 35 obj, end = self.raw_decode(s, idx=_w(s, 0).end()) 36 File "/usr/lib64/python3.5/json/decoder.py", line 356, in raw_decode 37 obj, end = self.scan_once(s, idx) 38json.decoder.JSONDecodeError: Unterminated string starting at: line 1 column 122871 (char 122870) 39
/usr/lib/python3.5/site-packages/dnf/base.py line 283:
1 279 if not self.conf.keepcache: 2 280 self._clean_packages(self._tempfiles) 3 281 if self._trans_success: 4 282 self._trans_tempfiles.update( 5 283 self._tempfile_persistor.get_saved_tempfiles()) 6 284 self._tempfile_persistor.empty() 7 285 if self._transaction.install_set: 8 286 self._clean_packages(self._trans_tempfiles) 9 287 else: 10 288 self._tempfile_persistor.tempfiles_to_add.update( 11 289 self._trans_tempfiles)
问题文件在：/var/cache/dnf/tempfiles.json，不完整的json array
如果不想改动代码：可以修改/etc/dnf/dnf.conf,添加keepcache=True，使代码不进入if表达式
[main]
gpgcheck=1
installonly_limit=3
clean_requirements_on_remove=True
keepcache=True
解决完了，发现如下问答：
http://superuser.com/questions/1102636/dnf-displays-error-after-package-install-on-fedora