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ohmyzsh/plugins/ssh-agent/README.md
Nuno Goncalves a206271460
ssh-agent: improvements (#6309)
* ssh-agent: lock this script with a mkdir style mutex

This script is a kind of singleton pattern and is not reentrant.
If several shells are oppened in a fast sequence, then several
independent ssh-agents would be created, which is not acceptable.
A mutex is required.

Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>

* ssh-agent: only start agent if .ssh dir exists

To use the same profile system-wide, it might happen
that the .ssh directory does not exist
(typically $HOME/.ssh/). This would trigger a error.

Creating the directory would be a option, but it
usually will not make sense to do so because it means
the user doesn't have ssh keys or config.

Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>

* ssh-agent: adds lazy option to disable key loading on start

Option is documented on updated README.md

Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>

* ssh-agent: simplify agent-forwarding checking

Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>

Co-authored-by: Robby Russell <robby@planetargon.com>
2021-06-11 19:03:25 -07:00

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# ssh-agent plugin
This plugin starts automatically `ssh-agent` to set up and load whichever
credentials you want for ssh connections.
To enable it, add `ssh-agent` to your plugins:
```zsh
plugins=(... ssh-agent)
```
## Settings
**IMPORTANT: put these settings _before_ the line that sources oh-my-zsh**
To enable **agent forwarding support** add the following to your zshrc file:
```zsh
zstyle :omz:plugins:ssh-agent agent-forwarding on
```
To **NOT load any identities on start** use the `lazy` style.
This is particularly usefull when combined with the AddKeysToAgent
(available from OpenSSH 7.2), since it allows to enter the password only
on first use.
```zsh
zstyle :omz:plugins:ssh-agent lazy yes
```
To **load multiple identities** use the `identities` style. This have no
effect if `lazy` is enabled.
```zsh
zstyle :omz:plugins:ssh-agent identities id_rsa id_rsa2 id_github
```
----
To **set the maximum lifetime of the identities**, use the `lifetime` style.
The lifetime may be specified in seconds or as described in sshd_config(5)
(see _TIME FORMATS_). If left unspecified, the default lifetime is forever.
```zsh
zstyle :omz:plugins:ssh-agent lifetime 4h
```
----
To **pass arguments to the `ssh-add` command** that adds the identities on startup,
use the `ssh-add-args` setting. You can pass multiple arguments separated by spaces:
```zsh
zstyle :omz:plugins:ssh-agent ssh-add-args -K -c -a /run/user/1000/ssh-auth
```
These will then be passed the the `ssh-add` call as if written directly. The example
above will turn into:
```zsh
ssh-add -K -c -a /run/user/1000/ssh-auth <identities>
```
For valid `ssh-add` arguments run `ssh-add --help` or `man ssh-add`.
## Credits
Based on code from Joseph M. Reagle: https://www.cygwin.com/ml/cygwin/2001-06/msg00537.html
Agent-forwarding support based on ideas from Florent Thoumie and Jonas Pfenniger