书写Augeas透镜

Question

我需要编辑/etc/mongodb.conf中的一行

auth = true

Augeas有一个蒙戈透镜，但是它只适用于augeas > 1.0

我完全卡在Augeas0.9，因为它是最新的版本在epel回购，我无法编译 augeas从github。

作为一项工作，我正在尝试写我自己的augeas镜头，它将在augeas 0.9上工作

到目前为止，我所拥有的是

module Spencer =

autoload xfm

let entry = key /[a-z]+/ . del /[ \t]*=[ \t]*/ "=" . store /[a-z]+/
let lns = [ entry . del "\n" "\n" ] *

test lns get "auth = false\nfoo = bar\n" = ?

let filter = incl "/etc/mongodb.conf"
let xfm = transform lns filter

当我尝试使用木偶类型将镜头应用到/etc/mongodb.conf时，我会得到一个错误：“迭代镜头匹配得比它应该的要少”。

puppet apply augmongo.pp --debug --verbose  --summarize
Info: Applying configuration version '1385024927'
Debug: Augeas[auth-mongo](provider=augeas): Opening augeas with root /, lens path , flags 64
Debug: Augeas[auth-mongo](provider=augeas): Augeas version 0.9.0 is installed
Test result: /usr/share/augeas/lenses/dist/spencer.aug:8.0-.44:
  { "auth" = "false" }
  { "foo" = "bar" }

Debug: Augeas[auth-mongo](provider=augeas): Will attempt to save and only run if files changed
Debug: Augeas[auth-mongo](provider=augeas): sending command 'set' with params ["/files/etc/mongodb.conf/auth", "true"]
Debug: Augeas[auth-mongo](provider=augeas): Put failed on one or more files, output from /augeas//error:
Debug: Augeas[auth-mongo](provider=augeas): /augeas/files/etc/mongodb.conf/error = put_failed
Debug: Augeas[auth-mongo](provider=augeas): /augeas/files/etc/mongodb.conf/error/pos = 1
Debug: Augeas[auth-mongo](provider=augeas): /augeas/files/etc/mongodb.conf/error/lens = /usr/share/augeas/lenses/dist/spencer.aug:6.10-.37:
Debug: Augeas[auth-mongo](provider=augeas): /augeas/files/etc/mongodb.conf/error/message = Iterated lens matched less than it should
Debug: Augeas[auth-mongo](provider=augeas): Closed the augeas connection
Error: /Stage[main]/Augmongo/Augeas[auth-mongo]: Could not evaluate: Save failed with return code false, see debug
Debug: Finishing transaction 69857417180740
Debug: Storing state
Debug: Stored state in 0.13 seconds

镜头怎么了？

我如何从命令行测试镜头并将木偶从等式中取出？

Answer 1

RHEL 6.4刚刚升级到Augeas 1.0。见https://rhn.redhat.com/errata/RHSA-2013-1537.html。

您应该能够重新构建包，或者等待CentOS为您完成此任务。

Answer 2

我和augeas和傀儡也有过类似的问题。每次应用更改似乎都会随着错误Could not evaluate: Save failed with return code false而结束。结果发现这是一个语法问题。我有：

set spec[user = '%somegroup']/host_group/command/tag  NOPASSWD

(注意tag和NOPASSWD之间的两个空空间)。当我用一个空空间尝试相同的命令时，这个问题就解决了。查看模板/镜头(spencer.aug，第6.10-.37行)可能会提供一些错误的线索。