On Wed, Nov 25, 2015 at 04:31:24PM -0800, Stefan Beller wrote:
> This passes each group to the `submodule update` invocation and
> additionally configures the groups to be automatically updated.
> 
> Signed-off-by: Stefan Beller <sbel...@google.com>
> ---
> 
> This is a resend of the patch "[PATCH 5/5] builtin/clone: support submodule 
> groups"
> as that's where Jens and I discussed.

Seeing the recent sparse checkout discussion I realized it might be
useful to have a similar sort of feature for sparse checkouts.  So say I
had a mobile and desktop client in the same repo and wanted to be able to
checkout the commoncode and one client without having to explicitly list
all the paths I care about. It seems like UI wise you might want to use
--group there too, or at least explaining the difference to users might
be interesting, but maybe that's worrying way too much abouta possible
future feature.

Trev

> 
> * reworded the documentation to match reality of the patch
> * --recurse is now implied and can be turned off.
> 
> Thanks for the fast feedback,
> Stefan
> 
> Interdiff to previous version [PATCH 5/5] builtin/clone: support submodule 
> groups
>         --- a/Documentation/git-clone.txt
>         +++ b/Documentation/git-clone.txt
>         @@ -211,14 +211,16 @@ objects from the source repository into a pack 
> in the cloned repository.
>          
>          --group::
>                 After the clone is created, all submodules which are part of 
> the
>         -       group are cloned. This option can be given multiple times to 
> specify
>         -       different groups. This option will imply automatic submodule
>         -       updates for the groups by setting `submodule.update=groups`.
>         -       The group selection will be passed on recursively, i.e. if a 
> submodule
>         -       is cloned because of group membership, its submodules will
>         -       be cloned according to group membership, too. If a submodule 
> is
>         -       not cloned however, its submodules are not evaluated for group
>         -       membership.
>         +       given groups are cloned. To specify multiple groups, you can 
> either
>         +       give the group argument multiple times or comma separate the 
> groups.
>         +       This option will be recorded in the `submodule.groups` config,
>         +       which will affect the behavior of other submodule related 
> commands,
>         +       such as `git submodule update`.
>         +       This option implies recursive submodule checkout. If you don't
>         +       want to recurse into nested submodules, you need to specify
>         +       `--no-recursive`. The group selection will be passed on 
> recursively,
>         +       i.e. if a submodule is cloned because of group membership, its
>         +       submodules will be cloned according to group membership, too.
>          
>          --separate-git-dir=<git dir>::
>                 Instead of placing the cloned repository where it is supposed
>         diff --git a/builtin/clone.c b/builtin/clone.c
>         index 17e9f54..377c031 100644
>         --- a/builtin/clone.c
>         +++ b/builtin/clone.c
>         @@ -39,7 +39,7 @@ static const char * const builtin_clone_usage[] = {
>          };
>          
>          static int option_no_checkout, option_bare, option_mirror, 
> option_single_branch = -1;
>         -static int option_local = -1, option_no_hardlinks, option_shared, 
> option_recursive;
>         +static int option_local = -1, option_no_hardlinks, option_shared, 
> option_recursive = -1;
>          static char *option_template, *option_depth;
>          static char *option_origin = NULL;
>          static char *option_branch = NULL;
>         @@ -875,9 +875,12 @@ int cmd_clone(int argc, const char **argv, const 
> char *prefix)
>                                 die(_("--bare and --separate-git-dir are 
> incompatible."));
>                         option_no_checkout = 1;
>                 }
>         -
>         -       if (option_recursive && submodule_groups.nr > 0)
>         -               die(_("submodule groups and recursive flag are 
> incompatible"));
>         +       if (option_recursive == -1) {
>         +               if (submodule_groups.nr > 0)
>         +                       option_recursive = 1; /* submodule groups 
> implies recursive */
>         +               else
>         +                       option_recursive = 0; /* preserve historical 
> default */
>         +       }
>                 if (submodule_groups.nr > 0) {
>                         int first_item = 1;
>                         struct string_list_item *item;
> 
> Here comes the actual patch:
> 
>  Documentation/git-clone.txt | 13 +++++++++
>  builtin/clone.c             | 38 ++++++++++++++++++++++---
>  git-submodule.sh            |  5 ++++
>  t/t7400-submodule-basic.sh  | 69 
> +++++++++++++++++++++++++++++++++++++++++++++
>  t/t7406-submodule-update.sh | 32 +++++++++++++++++++++
>  5 files changed, 153 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt
> index 59d8c67..2539fea 100644
> --- a/Documentation/git-clone.txt
> +++ b/Documentation/git-clone.txt
> @@ -209,6 +209,19 @@ objects from the source repository into a pack in the 
> cloned repository.
>       repository does not have a worktree/checkout (i.e. if any of
>       `--no-checkout`/`-n`, `--bare`, or `--mirror` is given)
>  
> +--group::
> +     After the clone is created, all submodules which are part of the
> +     given groups are cloned. To specify multiple groups, you can either
> +     give the group argument multiple times or comma separate the groups.
> +     This option will be recorded in the `submodule.groups` config,
> +     which will affect the behavior of other submodule related commands,
> +     such as `git submodule update`.
> +     This option implies recursive submodule checkout. If you don't
> +     want to recurse into nested submodules, you need to specify
> +     `--no-recursive`. The group selection will be passed on recursively,
> +     i.e. if a submodule is cloned because of group membership, its
> +     submodules will be cloned according to group membership, too.
> +
>  --separate-git-dir=<git dir>::
>       Instead of placing the cloned repository where it is supposed
>       to be, place the cloned repository at the specified directory,
> diff --git a/builtin/clone.c b/builtin/clone.c
> index ce578d2..377c031 100644
> --- a/builtin/clone.c
> +++ b/builtin/clone.c
> @@ -39,7 +39,7 @@ static const char * const builtin_clone_usage[] = {
>  };
>  
>  static int option_no_checkout, option_bare, option_mirror, 
> option_single_branch = -1;
> -static int option_local = -1, option_no_hardlinks, option_shared, 
> option_recursive;
> +static int option_local = -1, option_no_hardlinks, option_shared, 
> option_recursive = -1;
>  static char *option_template, *option_depth;
>  static char *option_origin = NULL;
>  static char *option_branch = NULL;
> @@ -51,6 +51,7 @@ static struct string_list option_config;
>  static struct string_list option_reference;
>  static int option_dissociate;
>  static int max_jobs = -1;
> +static struct string_list submodule_groups;
>  
>  static struct option builtin_clone_options[] = {
>       OPT__VERBOSITY(&option_verbosity),
> @@ -95,6 +96,8 @@ static struct option builtin_clone_options[] = {
>                  N_("separate git dir from working tree")),
>       OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
>                       N_("set config inside the new repository")),
> +     OPT_STRING_LIST('g', "group", &submodule_groups, N_("group"),
> +                     N_("clone specific submodule groups")),
>       OPT_END()
>  };
>  
> @@ -723,9 +726,18 @@ static int checkout(void)
>       err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
>                          sha1_to_hex(sha1), "1", NULL);
>  
> -     if (!err && option_recursive) {
> +     if (err)
> +             goto out;
> +
> +     if (option_recursive || submodule_groups.nr > 0) {
>               struct argv_array args = ARGV_ARRAY_INIT;
> -             argv_array_pushl(&args, "submodule", "update", "--init", 
> "--recursive", NULL);
> +             argv_array_pushl(&args, "submodule", "update", "--init", NULL);
> +
> +             if (option_recursive)
> +                     argv_array_pushf(&args, "--recursive");
> +
> +             if (submodule_groups.nr > 0)
> +                     argv_array_pushf(&args, "--groups");
>  
>               if (max_jobs != -1)
>                       argv_array_pushf(&args, "--jobs=%d", max_jobs);
> @@ -733,7 +745,7 @@ static int checkout(void)
>               err = run_command_v_opt(args.argv, RUN_GIT_CMD);
>               argv_array_clear(&args);
>       }
> -
> +out:
>       return err;
>  }
>  
> @@ -863,6 +875,24 @@ int cmd_clone(int argc, const char **argv, const char 
> *prefix)
>                       die(_("--bare and --separate-git-dir are 
> incompatible."));
>               option_no_checkout = 1;
>       }
> +     if (option_recursive == -1) {
> +             if (submodule_groups.nr > 0)
> +                     option_recursive = 1; /* submodule groups implies 
> recursive */
> +             else
> +                     option_recursive = 0; /* preserve historical default */
> +     }
> +     if (submodule_groups.nr > 0) {
> +             int first_item = 1;
> +             struct string_list_item *item;
> +             struct strbuf sb = STRBUF_INIT;
> +             strbuf_addstr(&sb, "submodule.groups=");
> +             for_each_string_list_item(item, &submodule_groups) {
> +                     strbuf_addf(&sb, "%s%s", first_item ? "" : ",", 
> item->string);
> +                     first_item = 0;
> +             }
> +             if (submodule_groups.nr > 0)
> +                     string_list_append(&option_config, strbuf_detach(&sb, 
> 0));
> +     }
>  
>       if (!option_origin)
>               option_origin = "origin";
> diff --git a/git-submodule.sh b/git-submodule.sh
> index 4092a48..e3d1667 100755
> --- a/git-submodule.sh
> +++ b/git-submodule.sh
> @@ -611,6 +611,7 @@ cmd_deinit()
>  #
>  cmd_update()
>  {
> +     groups=
>       # parse $args after "submodule ... update".
>       while test $# -ne 0
>       do
> @@ -650,6 +651,9 @@ cmd_update()
>               --checkout)
>                       update="checkout"
>                       ;;
> +             --groups)
> +                     groups=1
> +                     ;;
>               --depth)
>                       case "$2" in '') usage ;; esac
>                       depth="--depth=$2"
> @@ -691,6 +695,7 @@ cmd_update()
>               ${update:+--update "$update"} \
>               ${reference:+--reference "$reference"} \
>               ${depth:+--depth "$depth"} \
> +             ${groups:+--groups} \
>               ${jobs:+$jobs} \
>               "$@" | {
>       err=
> diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
> index caed4be..e8654d7 100755
> --- a/t/t7400-submodule-basic.sh
> +++ b/t/t7400-submodule-basic.sh
> @@ -1049,4 +1049,73 @@ test_expect_success 'submodule init --group works' '
>       )
>  '
>  
> +cat <<EOF > expected
> +submodule
> +-submodule1
> +EOF
> +
> +test_expect_success 'submodule update --groups works' '
> +     test_when_finished "rm -rf super super_clone" &&
> +     mkdir super &&
> +     pwd=$(pwd) &&
> +     (
> +             cd super &&
> +             git init &&
> +             git submodule add --group groupA file://"$pwd"/example2 
> submodule &&
> +             git submodule add file://"$pwd"/example2 submodule1 &&
> +             git commit -a -m "create repository with 2 submodules, one is 
> in a group"
> +     ) &&
> +     git clone super super_clone &&
> +     (
> +             cd super_clone &&
> +             git config submodule.groups groupA &&
> +             git submodule init  &&
> +             git submodule update --groups &&
> +             git submodule status |cut -c1,42-52 | tr -d " " >../actual
> +     ) &&
> +     test_cmp actual expected
> +'
> +
> +test_expect_success 'submodule update --init --groups works' '
> +     test_when_finished "rm -rf super super_clone" &&
> +     mkdir super &&
> +     pwd=$(pwd) &&
> +     (
> +             cd super &&
> +             git init &&
> +             git submodule add --group groupA file://"$pwd"/example2 
> submodule &&
> +             git submodule add file://"$pwd"/example2 submodule1 &&
> +             git commit -a -m "create repository with 2 submodules, one is 
> in a group"
> +     ) &&
> +     git clone super super_clone &&
> +     (
> +             cd super_clone &&
> +             git config submodule.groups groupA &&
> +             git submodule update --init --groups &&
> +             git submodule status |cut -c1,42-52 | tr -d " " >../actual
> +     ) &&
> +     test_cmp actual expected
> +'
> +
> +test_expect_success 'clone --group works' '
> +     test_when_finished "rm -rf super super_clone" &&
> +     mkdir super &&
> +     pwd=$(pwd) &&
> +     (
> +             cd super &&
> +             git init &&
> +             git submodule add --group groupA file://"$pwd"/example2 
> submodule &&
> +             git submodule add file://"$pwd"/example2 submodule1 &&
> +             git commit -a -m "create repository with 2 submodules, one is 
> in a group"
> +     ) &&
> +     git clone --group groupA super super_clone &&
> +     (
> +             cd super_clone &&
> +             test_pause
> +             git submodule status |cut -c1,42-52 | tr -d " " >../actual
> +     ) &&
> +     test_cmp actual expected
> +'
> +
> +
>  test_done
> diff --git a/t/t7406-submodule-update.sh b/t/t7406-submodule-update.sh
> index 090891e..7e59846 100755
> --- a/t/t7406-submodule-update.sh
> +++ b/t/t7406-submodule-update.sh
> @@ -801,4 +801,36 @@ test_expect_success 'git clone passes the parallel jobs 
> config on to submodules'
>       rm -rf super4
>  '
>  
> +cat >expect <<-EOF &&
> +-deeper/submodule
> +-merging
> +-moved/sub module
> +-none
> +-rebasing
> +-submodule
> +-submodule1
> +EOF
> +
> +# none, merging rebasing, submodule1, submodule
> +test_expect_success 'git clone works with submodule groups.' '
> +     test_when_finished "rm -rf super5" &&
> +     (
> +             cd super &&
> +             git config -f .gitmodules  submodule.submodule.groups default &&
> +             git config -f .gitmodules  submodule.submodule1.groups 
> "default,testing" &&
> +             git config -f .gitmodules  submodule.none.groups testing &&
> +             git commit -a -m "assigning groups to submodules"
> +     ) &&
> +     git clone --group default --group testing super super5 &&
> +     (
> +             cd super5 &&
> +             git submodule status |cut -c1,43- >../actual
> +     ) &&
> +     test_cmp actual expect
> +'
> +
> +test_expect_success 'git submodule update --groups' '
> +     true
> +'
> +
>  test_done
> -- 
> 2.6.1.261.g0d9c4c1
> 
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