在Fedora 23上配置快照/快照

Question

当我试图在F23上配置管理器时，我得到了一个错误。我的根分区是btrfs，我已经安装了管理程序包。当我最初尝试创建默认根配置时，会发生错误。

当我运行cmd时：

snapper -c root create-config /

终端输出是：

Creating config failed (creating btrfs snapshot failed)

snapper.log：

2015-11-26 01:55:45 MIL libsnapper(3335) Snapper.cc(createConfig):288 - Snapper create-config
2015-11-26 01:55:45 MIL libsnapper(3335) Snapper.cc(createConfig):289 - libsnapper version 0.2.8
2015-11-26 01:55:45 MIL libsnapper(3335) Snapper.cc(createConfig):291 - config_name:root subvolume:/ fstype:btrfs template_name:default
2015-11-26 01:55:45 MIL libsnapper(3335) Snapper.cc(getConfigs):247 - Snapper get-configs
2015-11-26 01:55:45 MIL libsnapper(3335) Snapper.cc(getConfigs):248 - libsnapper version 0.2.8
2015-11-26 01:55:45 MIL libsnapper(3335) AsciiFile.cc(reload):114 - loading file /etc/sysconfig/snapper
2015-11-26 01:55:45 MIL libsnapper(3335) AsciiFile.cc(getValue):235 - key:SNAPPER_CONFIGS value:
2015-11-26 01:55:45 MIL libsnapper(3335) AsciiFile.cc(reload):114 - loading file /etc/sysconfig/snapper
2015-11-26 01:55:45 MIL libsnapper(3335) AsciiFile.cc(getValue):235 - key:SNAPPER_CONFIGS value:
2015-11-26 01:55:45 MIL libsnapper(3335) AsciiFile.cc(save):139 - saving file /etc/sysconfig/snapper
2015-11-26 01:55:45 MIL libsnapper(3335) AsciiFile.cc(reload):114 - loading file /etc/snapper/config-templates/default
2015-11-26 01:55:45 MIL libsnapper(3335) AsciiFile.cc(save):139 - saving file /etc/snapper/configs/root
2015-11-26 01:55:45 ERR libsnapper(3335) Btrfs.cc(createConfig):112 - create subvolume failed, ioctl(BTRFS_IOC_SUBVOL_CREATE) failed, errno:17 (File exists)
2015-11-26 01:55:45 MIL libsnapper(3335) AsciiFile.cc(reload):114 - loading file /etc/sysconfig/snapper
2015-11-26 01:55:45 MIL libsnapper(3335) AsciiFile.cc(getValue):235 - key:SNAPPER_CONFIGS value:root
2015-11-26 01:55:45 MIL libsnapper(3335) SystemCmd.cc(SystemCmd):46 - constructor SystemCmd:"/usr/bin/rm '/etc/snapper/configs/root'"
2015-11-26 01:55:45 MIL libsnapper(3335) SystemCmd.cc(execute):82 - SystemCmd Executing:"/usr/bin/rm '/etc/snapper/configs/root'"
2015-11-26 01:55:45 MIL libsnapper(3335) SystemCmd.cc(doExecute):267 - stopwatch 0.002974s for "/usr/bin/rm '/etc/snapper/configs/root'"
2015-11-26 01:55:45 MIL libsnapper(3335) SystemCmd.cc(doExecute):287 - system() Returns:0
2015-11-26 01:55:45 MIL libsnapper(3335) AsciiFile.cc(save):139 - saving file /etc/sysconfig/snapper

错误似乎是，

create subvolume failed, ioctl(BTRFS_IOC_SUBVOL_CREATE) failed, errno:17 (File exists)

但谷歌对这一错误并没有多大帮助。

我是否需要首先在我的btrfs根分区中执行或启用某些操作？

Answer 1

我花了一段时间才发现这一点，但SELinux中似乎有一个错误导致了这种情况。实际上，它本身并不是一个bug，但它与默认情况下没有dac_override功能的快照有关。我为打开的bug报告做出了贡献。

https://bugzilla.redhat.com/show_bug.cgi?id=1282836