bug#45187: git download defaults to origin/master

[Kyle Meyer <kyle@kyleam.com>]

Kyle Meyer writes:

> @@ -356,6 +360,7 @@ (define* (update-cached-checkout url
>  
>  REF is pair whose key is [branch | commit | tag | tag-or-commit ] and value
>  the associated data: [<branch name> | <sha1> | <tag name> | <string>].
> +IF REF is the empty list, the remote HEAD is used.

Sorry, here and ...

> @@ -433,12 +439,13 @@ (define* (latest-repository-commit store url
>                                     (log-port (%make-void-port "w"))
>                                     (cache-directory
>                                      (%repository-cache-directory))
> -                                   (ref '(branch . "master")))
> +                                   (ref '()))
>    "Return two values: the content of the git repository at URL copied into a
>  store directory and the sha1 of the top level commit in this directory.  The
>  reference to be checkout, once the repository is fetched, is specified by REF.
>  REF is pair whose key is [branch | commit | tag] and value the associated
> -data, respectively [<branch name> | <sha1> | <tag name>].
> +data, respectively [<branch name> | <sha1> | <tag name>].  IF REF is the empty
> +list, the remote HEAD is used.

... here should say "If" rather than "IF".