Maven mercurial extension constantly fails

After 2+ hours I was able to get the maven-scm-provider-hg extension (for pushing to mercurial repos from Maven) semi working, meaning that it was executing commands instead of just giving errors.

However I think I've run into a wall with this error

[INFO] [deploy:deploy {execution: default-deploy}]
[INFO] Retrieving previous build number from pircbotx.googlecode.com
[INFO] Removing C:\DOCUME~1\Owner\LOCALS~1\Temp\wagon-scm1210107000.checkout\pir    cbotx\pircbotx\1.3-SNAPSHOT
[INFO] EXECUTING: cmd.exe /X /C "hg clone -r tip https://*SNIP*@site.pircbotx.googlecode.com/hg/maven2/snapshots/pircbotx/pircbotx/1.3-SNAPSHOT C:\DOCUME~1\Owner\LOCALS~1\Temp\wagon-scm1210107000.checkout\pircbotx\pircbotx\1.3-SNAPSHOT"
[INFO] EXECUTING: cmd.exe /X /C "hg locate"
[INFO] repository metadata for: 'snapshot pircbotx:pircbotx:1.3-SNAPSHOT' could not be found on repository: pircbotx.googlecode.com, so will be created Uploading: scm:hg:https://site.pircbotx.googlecode.com开发者_JAVA百科/hg/maven2/snapshots/pircbotx/pircbotx/1.3-SNAPSHOT/pircbotx-1.3-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Error deploying artifact: Error listing repository: No such command 'list'.

What on earth would cause that error? I'm on a Windows box, so any commands that aren't commands give "'list' is not recognized as an internal or external command...", not "No such command 'list'."

POM

<build>
    <extensions>
        <extension>
            <groupId>org.apache.maven.scm</groupId>
            <artifactId>maven-scm-provider-hg</artifactId>
            <version>1.4</version>
        </extension>
        <extension>
            <groupId>org.apache.maven.wagon</groupId>
            <artifactId>wagon-scm</artifactId>
            <version>1.0-beta-7</version>
        </extension>
    </extensions>
     ...

<distributionManagement>
    <snapshotRepository>
        <id>pircbotx.googlecode.com</id>
        <name>PircBotX Site</name>
        <url>scm:hg:https://site.pircbotx.googlecode.com/hg/maven2/snapshots</url>
        <uniqueVersion>false</uniqueVersion>
    </snapshotRepository>
</distributionManagement>

Mercurial version

W:\programming\pircbot-hg>hg version
Mercurial Distributed SCM (version 1.7.2)

Any suggestions?

Firstly, not sure if deploying the project artifacts to an SCM is a normal practice. maven scm plugin is usually used for source code related operations like checkout/update/tag, etc.

Secondly, the cause of the error seems to be related to the fact that maven scm provider for hg does not support the list command as specified in this scm providers matrix. Not sure why and how mvn deploy uses this command though.