nico/www.nico.schottelius.org
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

correct typos and metacharecter expansion

Browse source 
Signed-off-by: Nico Schottelius <nico@brief.schottelius.org>
This commit is contained in:
Nico Schottelius 2012-11-22 20:35:08 +01:00
parent 64561acccb
commit cb0604e759
1 changed files with 11 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
blog/cdist-transfer-files-recursively.mdwn
View file

@ -3,7 +3,7 @@
## Introduction
This article describes one solution to transfer a folder
and all of its contents recursively with [[cdist homepage|software/cdist]]
and all of its contents recursively with [[cdist|software/cdist]]
to target hosts. I am motivated to do so, because I want to have one
central place to configure the tftproot that I may use on a variety
of KVM hosts.
@ -11,7 +11,11 @@ of KVM hosts.
Traditionally, it is not an easy job to handle recursive transfer correctly
and efficiently in a configuration management system. Using a sophisticated
tool like [rsync](http://rsync.samba.org/) or
[unison](http://www.cis.upenn.edu/~bcpierce/unison/) makes life way easier.
[unison](http://www.cis.upenn.edu/~bcpierce/unison/) makes life
usually way easier.
If you just have a minor number of files, like I have in this case,
doing a recursive copy with cdist may be the easist way.
## Copying the files recursively
@ -20,14 +24,14 @@ file transfer and directory management.
The type **\_\_nico\_tftp\_root**,
which can be found in the
[cdist-nico git repository](http://git.schottelius.org/?p=cdist-nico)
(below **cdist/conf/type**) recursively copies all files it has to
(below **cdist/conf/type**) recursively copies all files it contains to
the folder **/home/service/tftp**. Only when a file is changed, it
is transferred again (the **\_\_file** type takes care of this).
## The manifest
In cdist, a manifest of a type defines, which other types to use.
A manifest file is essentially shell code, that can call other
A manifest file is essentially shell code that can call other
cdist types.
To accomplish the task, first of all the base directory is created
@ -51,7 +55,7 @@ Now, for every file I determine the remote file name. Furthermore
dependencies to the required directories are setup:
You can **require** another type to be run before a type, by setting
up the **require** environment variable (this will be changed in cdist
2.1. and replaced in 2.2, but there is still some time until this is released).
2.1. and replaced in 2.2, but there is still some time until this happens).
The remote name is constructed by this line:
@ -62,8 +66,8 @@ And the requirement is setup using this line:
# Require the previous directory in the path
export require="__directory/${name%/*}"
The shell (!) knows about string manipulation: ${variablename%/*} replaces
the shortest matching suffix that equals "/*". And thus the previous
The shell (!) knows about string manipulation: ${variablename%/\*} replaces
the shortest matching suffix that equals "/\*". And thus the previous
statement removes the last part of the path (also known as dirname).
If the file found by find is a file, we call the \_\_file type,