Edgar

I take some times to write a new utility for my day to day work: Edgar[1].

`edgar' is a small utility to help one maintain their huge SSH config file. It's heavilly inspired by concierge[2] (even the tests are directly taken from the `concierge' examples!).

[1] Edgar (HTTPS)

[2] concierge (HTTPS)

Installation

`edgar' only support python3. We are now in 2019!

virtualenv edgar-venv
source edgar-venv/bin/activate
python setup.py install

Usage

Contrary to `concierge', there is no inotify support. The main idea is that you are not always modifying your SSH config file and it's not that hard to just call manually `edgar' when your config template is ready.

`edgar' rely on a config file stored in your `~/.config' folder: `~/.config/edgar.yml'. As its name show it, this is a YAML file.

This file should contain a list of host configurations. Thus the most simple config file may be:

---
- Host: m1
  HostName: 192.168.1.42
  User: edgar
- Host: m2
  HostName: 192.168.1.43
  User: edgar

Which will output the following:

Host m1
  HostName 192.168.1.42
  User edgar

Host m2
  HostName 192.168.1.43
  User edgar

If the main object is not a list, it is taken as a primary host configuration named `*':

---
Compression: yes
ServerAliveInterval: 120
ServerAliveCountMax: 2
UseRoaming: no
HashKnownHosts: yes
IdentitiesOnly: yes
AddKeysToAgent: yes

hosts:
- Host: m1
  HostName: 192.168.1.42
  User: edgar
- Host: m2
  HostName: 192.168.1.43
  User: edgar

Which will output the following:

Host *
  Compression yes
  ServerAliveInterval 120
  ServerAliveCountMax 2
  UseRoaming no
  HashKnownHosts yes
  IdentitiesOnly yes
  AddKeysToAgent yes

Host m1
  HostName 192.168.1.42
  User edgar
Host m2
  HostName 192.168.1.43
  User edgar

Finally, `edgar' understands sub-hosts and ansible-like `with_items' processing:

---
Compression: yes
ServerAliveInterval: 120
ServerAliveCountMax: 2
UseRoaming: no
HashKnownHosts: yes
IdentitiesOnly: yes
AddKeysToAgent: yes

hosts:
- Host: m
  User: edgar
  Protocol: 2
  hide: yes
  hosts:
  - Host: e{item}
    HostName: 10.10.0.{item}
    ViaProxy: gw2
    with_items: range(2)
- Host: blog
  User: sa

Which will output the following:

Host *
  Compression yes
  ServerAliveInterval 120
  ServerAliveCountMax 2
  UseRoaming no
  HashKnownHosts yes
  IdentitiesOnly yes
  AddKeysToAgent yes

Host me0
  User edgar
  Protocol 2
  HostName 10.10.0.0
  ProxyCommand ssh -W %h:%p gw2

Host me1
  User edgar
  Protocol 2
  HostName 10.10.0.1
  ProxyCommand ssh -W %h:%p gw2

Host blog
  User sa

Reference

`edgar' understands all SSH config parameter, only if they are well written (there is no attempt to add missing capital).

It understands the following supplementary commands:

`hosts': define a sub-host listing, each of them will inherit from the current host parameters. Value must be a list of hosts configurations.
`hide': don't create a specific host configuration for the current host, only use it for factorization purpose of its sub-hosts. Value must be a boolean. Default is no (false).
`prefix': don't concatenate the current host name with it's potential sub-hosts name. Value must be a boolean. Default is yes (true).
`with_items': define that the current host configuration must be duplicated for each item of this list. Value must be something python is able to iterate over (a list, a range expression…). You can use the `{item}' tag in the `Host' and `Hostname' as you wish.
`ViaProxy <host>': shortcut helper, which expands to `ProxyCommand ssh -W %h:%p <host>'.

FAQ

*Edgar crash with a weird error message about YAML parser*

1. Don't forget to add the colon between the SSH parameter and its value.

2. Some values must be protected, like the one with `*'. For exemple: `Host: "*.toto.com"'.

Comments

nil

📅 vendredi 22 novembre 2019 à 22:36

📝 Étienne Pflieger with GNU/Emacs 29.4 (Org mode 9.7.11)

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