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mercurial_keyring

mercurial_keyring is a Mercurial extension used to securely save HTTP and SMTP authentication passwords in password databases (Gnome Keyring, KDE KWallet, OSXKeyChain, specific solutions for Win32 and command line). This extension uses and wraps services of the keyring library.

How does it work

The extension prompts for the password on the first pull/push (in case of HTTP) or first email (in case of SMTP), just like it is done by default, but saves the password. On successive runs it checks for the username in .hg/hgrc, then for suitable password in the password database, and uses those credentials (if found).

In case password turns out to be incorrect (either because it was invalid, or because it was changed on the server) or missing it just prompts the user again.

Passwords are identified by the combination of username and remote address, so they can be reused between repositories if they access the same remote repository (or the same SMTP server).

Installation

Prerequisites

Install the keyring library:

easy_install keyring

(or pip keyring). On Debian "Sid" the library can be also installed from the official archive (packages python-keyring and either python-keyring-gnome or python-keyring-kwallet).

Note: keyring >= 0.3 is strongly recommended, especially in case text backend is to be used.

Extension installation

There are two possible ways of installing the extension: using PyPi package, or using individual file.

To install as a package use easy_install:

easy_install mercurial_keyring

and then enable it in ~/.hgrc (or /etc/mercurial/hgrc) using:

[extensions]
mercurial_keyring =

To install using individual file, download the mercurial_keyring.py file, save it anywhere you like, and put the following in ~/.hgrc (or /etc/mercurial/hgrc):

[extensions]
hgext.mercurial_keyring = /path/to/mercurial_keyring.py

Password backend configuration

The library should usually pick the most appropriate password backend without configuration. Still, if necessary, it can be configured using ~/keyringrc.cfg file (keyringrc.cfg in the home directory of the current user). Refer to keyring docs for more details.

I considered handling similar options in hgrc, but decided that single user may use more than one keyring-based script. Still, I am open to suggestions.

Repository configuration (HTTP)

Edit repository-local .hg/hgrc and save there the remote repository path and the username, but do not save the password. For example:

[paths]
myremote = https://my.server.com/hgrepo/someproject

[auth]
myremote.schemes = http https
myremote.prefix = my.server.com/hgrepo
myremote.username = mekk

Simpler form with url-embedded name can also be used:

[paths]
bitbucket = https://User@bitbucket.org/User/project_name/

If prefix is specified, it is used to identify the password (so all repositories with the same prefix and the same username will share the same password). Otherwise full repository URL is used for this purpose.

Note: if both username and password are given in .hg/hgrc, extension will use them without using the password database. If username is not given, extension will prompt for credentials every time, also without saving the password.

Finally, if you are consistent about remote repository nicknames, you can configure the username in your ~/.hgrc (.hgrc in your home directory). For example, write there:

[auth]
acme.prefix = hg.acme.com/repositories
acme.username = johnny
acme.schemes = http https

and as long as you will be using alias acme for repositories like https://hg.acme.com/repositories/my_beautiful_app, username johnnny will be used, and the same password reused.

The advantage of this method is that it works also for clone.

Repository configuration (SMTP)

Edit either repository-local .hg/hgrc, or ~/.hgrc and set there all standard email and smtp properties, including SMTP username, but without SMTP password. For example:

[email]
method = smtp
from = Joe Doe <Joe.Doe@remote.com>

[smtp]
host = smtp.gmail.com
port = 587
username = JoeDoe@gmail.com
tls = true

Just as in case of HTTP, you must set username, but must not set password here to use the extension, in other cases it will revert to the default behavior.

Usage

Configure the repository as above, then just hg pull, hg push, etc. You should be asked for the password only once (per every username and remote repository prefix or url combination).

Similarly, for email, configure as above and just hg email. Again, you will be asked for the password once (per every username and email server address combination).

Implementation details

The extension is monkey-patching the mercurial passwordmgr class to replace the find_user_password method. Detailed order of operations is described in the comments inside the code.

Development

Development is tracked on BitBucket, see http://bitbucket.org/Mekk/mercurial_keyring/

Additional notes

Information about this extension is also available on Mercurial Wiki: http://mercurial.selenic.com/wiki/KeyringExtension

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