Fedora DNF 报错 - HelloWorld开发者社区

升级fedora 24以后，安装软件报错

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Traceback (most recent call last):
  File "/bin/dnf", line 58, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 174, in user_main
    errcode = main(args)
  File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 60, in main
    return _main(base, args)
  File "/usr/lib/python3.5/site-packages/dnf/base.py", line 102, in __exit__
    self.close()
  File "/usr/lib/python3.5/site-packages/dnf/base.py", line 283, in close
    self._tempfile_persistor.get_saved_tempfiles())
  File "/usr/lib/python3.5/site-packages/dnf/persistor.py", line 483, in get_saved_tempfiles
    return self._get_json_db(self.db_path)
  File "/usr/lib/python3.5/site-packages/dnf/persistor.py", line 425, in _get_json_db
    default = json.loads(content)
  File "/usr/lib64/python3.5/json/__init__.py", line 319, in loads
    return _default_decoder.decode(s)
  File "/usr/lib64/python3.5/json/decoder.py", line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib64/python3.5/json/decoder.py", line 355, in raw_decode
    obj, end = self.scan_once(s, idx)
json.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)

345     def raw_decode(self, s, idx=0):
346         """Decode a JSON document from ``s`` (a ``str`` beginning with
347         a JSON document) and return a 2-tuple of the Python
348         representation and the index in ``s`` where the document ended.
349 
350         This can be used to decode a JSON document from a string that may
351         have extraneous data at the end.
352 
353         """
354         try:
355             print(s) 
356             obj, end = self.scan_once(s, idx)
357         except StopIteration as err:
358             raise JSONDecodeError("Expecting value", s, err.value) from None
359         return obj, end

打印内容：

["/var/lib/dnf/system-upgrade/libteam-1.25-1.fc24.x86_64.rpm",
 "/var/lib/dnf/system-upgrade/libmetalink-0.1.2-9.fc24.x86_64.rpm", 
"/var/lib/dnf/system-upgrade/xfwm4-4.12.3-3.fc24.x86_64.rpm", 
"/var/lib/dnf/system-upgrade/gnome-font-viewer-3.20.2-1.fc24.x86_64.rpm",
 "/var/lib/dnf/system-upgrade/jzlib-1.1.3-4.fc24.noarch.rpm", 
"/var/lib/dnf/system-upgrade/libetonyek-0.1.6-4.fc24.x86_64.rpm", 
"/var/lib/dnf/system-upgrade/perl-File-Path-2.12-2.fc24.noarch.rpm",
 "/var/lib/dnf/system-upgrade/alsa-plugins-pulseaudio-1.1.1-1.fc24.x86_64.rpm", 
"/var/lib/dnf/system-upgrade/python-lxml-3.4.4-4.fc24.x86_64.rpm", 
"/var/lib/dnf/system-upgrade/libreport-2.7.2-1.fc24.x86_64.rpm", 
"/var/lib/dnf/system-upgrade/libffado-2.2.1-8.fc24.x86_64.rpm", 
"/var/lib/dnf/system-upgrade/texlive-kastrup-svn15878.0-24.fc24.1.noarch.rpm", 
"/var/lib/dnf/system-upgrade/zenity-3.20.0-1.fc24.x86_64.rpm",
 "/var/lib/dnf/system-upgrade/texlive-fpl-svn15878.1.002-24.fc24.1.noarch.rpm", 
"/var/lib/dnf/system-upgrade/texlive-lib-2015-24.20150728_r37987.fc24.x86_64.rpm", "/var/lib/
#结尾少了数组的结束符中括号 "]"
Traceback (most recent call last):
  File "/bin/dnf", line 58, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 174, in user_main
    errcode = main(args)
  File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 60, in main
    return _main(base, args)
  File "/usr/lib/python3.5/site-packages/dnf/base.py", line 102, in __exit__
    self.close()
  File "/usr/lib/python3.5/site-packages/dnf/base.py", line 283, in close
    self._tempfile_persistor.get_saved_tempfiles())
  File "/usr/lib/python3.5/site-packages/dnf/persistor.py", line 483, in get_saved_tempfiles
    return self._get_json_db(self.db_path)
  File "/usr/lib/python3.5/site-packages/dnf/persistor.py", line 425, in _get_json_db
    default = json.loads(content)
  File "/usr/lib64/python3.5/json/__init__.py", line 319, in loads
    return _default_decoder.decode(s)
  File "/usr/lib64/python3.5/json/decoder.py", line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib64/python3.5/json/decoder.py", line 356, in raw_decode
    obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Unterminated string starting at: line 1 column 122871 (char 122870)

/usr/lib/python3.5/site-packages/dnf/base.py line 283:

   279            if not self.conf.keepcache:
   280                self._clean_packages(self._tempfiles)
   281                if self._trans_success:
   282                    self._trans_tempfiles.update(
   283                        self._tempfile_persistor.get_saved_tempfiles())
   284                    self._tempfile_persistor.empty()
   285                    if self._transaction.install_set:
   286                        self._clean_packages(self._trans_tempfiles)
   287                else:
   288                    self._tempfile_persistor.tempfiles_to_add.update(
   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