On Thu, Mar 27, 2014 at 11:36 PM, W. Trevor King <wking@xxxxxxxxxx> wrote:
> gitmodule(5) mentioned 'master' as the default remote branch, but
> folks using checkout-style updates are unlikely to care which upstream
> branch their commit comes from (they only care that the clone fetches
> that commit). If they haven't set submodule.<name>.branch, it makes
> more sense to mirror 'git clone' and use the subproject's HEAD than to
> default to 'master' (which may not even exist).
>
> After the initial clone, subsequent updates may be local or remote.
> Local updates (integrating gitlink changes) have no need to fetch a
> specific remote branch, and get along just fine without
> submodule.<name>.branch. Remote updates do need a remote branch, but
> HEAD works as well here as it did for the initial clone.
>
> Reported-by: Johan Herland <johan@xxxxxxxxxxx>
> Signed-off-by: W. Trevor King <wking@xxxxxxxxxx>
> ---
> diff --git a/Documentation/git-submodule.txt b/Documentation/git-submodule.txt
> index 46c1eeb..c485a17 100644
> --- a/Documentation/git-submodule.txt
> +++ b/Documentation/git-submodule.txt
> @@ -284,7 +284,7 @@ OPTIONS
> the superproject's recorded SHA-1 to update the submodule, use the
> status of the submodule's remote-tracking branch. The remote used
> is branch's remote (`branch.<name>.remote`), defaulting to `origin`.
> - The remote branch used defaults to `master`, but the branch name may
> + The remote branch used defaults to `HEAD`, but the branch name may
> be overridden by setting the `submodule.<name>.branch` option in
> either `.gitmodules` or `.git/config` (with `.git/config` taking
> precedence).
> diff --git a/Documentation/gitmodules.txt b/Documentation/gitmodules.txt
> index f539e3f..1aecce9 100644
> --- a/Documentation/gitmodules.txt
> +++ b/Documentation/gitmodules.txt
> @@ -53,8 +53,9 @@ submodule.<name>.update::
>
> submodule.<name>.branch::
> A remote branch name for tracking updates in the upstream submodule.
> - If the option is not specified, it defaults to 'master'. See the
> - `--remote` documentation in linkgit:git-submodule[1] for details.
> + If the option is not specified, it defaults to the subproject's
Did you mean s/subproject/submodule/ ?
> + HEAD. See the `--remote` documentation in linkgit:git-submodule[1]
> + for details.
> +
> This branch name is also used for the local branch created by
> non-checkout cloning updates. See the `update` documentation in
> diff --git a/git-submodule.sh b/git-submodule.sh
> index 6135cfa..5f08e6c 100755
> --- a/git-submodule.sh
> +++ b/git-submodule.sh
> @@ -819,8 +819,8 @@ cmd_update()
> name=$(module_name "$sm_path") || exit
> url=$(git config submodule."$name".url)
> config_branch=$(get_submodule_config "$name" branch)
> - branch="${config_branch:-master}"
> - local_branch="$branch"
> + branch="${config_branch:-HEAD}"
> + local_branch="$config_branch"
> if ! test -z "$update"
> then
> update_module=$update
> @@ -860,7 +860,12 @@ Maybe you want to use 'update --init'?")"
>
> if ! test -d "$sm_path"/.git -o -f "$sm_path"/.git
> then
> - start_point="origin/${branch}"
> + if test -n "$config_branch"
> + then
> + start_point="origin/$branch"
> + else
> + start_point=""
> + fi
> module_clone "$sm_path" "$name" "$url" "$reference" "$depth" "$start_point" "$local_branch" || exit
> cloned_modules="$cloned_modules;$name"
> subsha1=
> --
> 1.9.1.352.gd393d14.dirty
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