Merge pull request taskcluster#192 from djmitche/bug1466679

Bug 1466679 - use rootUrl in 'taskcluster signin'

Merge pull request taskcluster#184 from taskcluster/url-escape-scopes

url escape scopes

Add a scriptable check for valid credentials (taskcluster#182)

This allows users to `taskcluster signin --check` and get
an exit code of 1 if their credentials are either not found,
or expired.

I've successfully used it with this bash wrapper:

tc() {
    if ! TC=$(which taskcluster)
    then
        echo "Unable to find taskcluster command"
        return
    fi

    CLIENTVARS=${TASKCLUSTER_CLIENT_STORE:-"/dev/shm/tcclient.creds"}
    if [ -f "$CLIENTVARS" ] ; then
        # shellcheck source=/dev/null
        source "$CLIENTVARS"
    fi

    if ! ${TC} signin --check; then
        ${TC} signin > "$CLIENTVARS"
        # shellcheck source=/dev/null
        source "$CLIENTVARS"
    fi
    ${TC} "$@"
}

Bug 1395349 - refactor signin to use new client creator, don't store (t…

…askcluster#174)

It's best to encourage users to not keep TC credentials on disk, so this
writes them out as env vars instead.  The result will still *read* from
`~/.config/taskcluster.yml`, just not write to it.

Example:

```
dustin@jemison $ eval $(./taskcluster signin --scope 'queue:*')
Starting
Listening for a callback on: http://localhost:33459
Opening URL: https://tools.taskcluster.net/auth/clients/new?name=cli&description=Temporary+client+for+use+on+the+command+line&scope=queue:*&expires=1d&callback_url=http%3A%2F%2Flocalhost%3A33459
Credentials recorded as environment variables

dustin@jemison $ ./taskcluster api auth currentScopes
{
  "scopes": [
    "queue:*"
  ]
}
```

Merge pull request taskcluster#163 from taskcluster/add-task-def-command

Add a task definition fetching command

Merge pull request taskcluster#162 from taskcluster/fix-signin-on-win…

…dows

Fix signin on windows

point to indexed artifacts in README

fix git checkout

don't use go get

index by version, too