Similar to the `preserve` mode simply passing the `--preserve-merges`
option to the `rebase` command, the `merges` mode simply passes the
`--rebase-merges` option.

This will allow users to conveniently rebase non-trivial commit
topologies when pulling new commits, without flattening them.

Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 Documentation/config.txt               |  8 ++++++++
 Documentation/git-pull.txt             |  5 ++++-
 builtin/pull.c                         | 14 ++++++++++----
 builtin/remote.c                       | 18 ++++++++++++++----
 contrib/completion/git-completion.bash |  2 +-
 5 files changed, 37 insertions(+), 10 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 2659153cb37..da46f154bb3 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1058,6 +1058,10 @@ branch.<name>.rebase::
        "git pull" is run. See "pull.rebase" for doing this in a non
        branch-specific manner.
 +
+When `merges`, pass the `--rebase-merges` option to 'git rebase'
+so that locally committed merge commits will not be flattened
+by running 'git pull'.
++
 When preserve, also pass `--preserve-merges` along to 'git rebase'
 so that locally committed merge commits will not be flattened
 by running 'git pull'.
@@ -2617,6 +2621,10 @@ pull.rebase::
        pull" is run. See "branch.<name>.rebase" for setting this on a
        per-branch basis.
 +
+When `merges`, pass the `--rebase-merges` option to 'git rebase'
+so that locally committed merge commits will not be flattened
+by running 'git pull'.
++
 When preserve, also pass `--preserve-merges` along to 'git rebase'
 so that locally committed merge commits will not be flattened
 by running 'git pull'.
diff --git a/Documentation/git-pull.txt b/Documentation/git-pull.txt
index ce05b7a5b13..6f76d815dd3 100644
--- a/Documentation/git-pull.txt
+++ b/Documentation/git-pull.txt
@@ -101,13 +101,16 @@ Options related to merging
 include::merge-options.txt[]
 
 -r::
---rebase[=false|true|preserve|interactive]::
+--rebase[=false|true|merges|preserve|interactive]::
        When true, rebase the current branch on top of the upstream
        branch after fetching. If there is a remote-tracking branch
        corresponding to the upstream branch and the upstream branch
        was rebased since last fetched, the rebase uses that information
        to avoid rebasing non-local changes.
 +
+When set to `merges`, rebase using `git rebase --rebase-merges` so that
+locally created merge commits will not be flattened.
++
 When set to preserve, rebase with the `--preserve-merges` option passed
 to `git rebase` so that locally created merge commits will not be flattened.
 +
diff --git a/builtin/pull.c b/builtin/pull.c
index e32d6cd5b4c..70b44146ce4 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -27,14 +27,16 @@ enum rebase_type {
        REBASE_FALSE = 0,
        REBASE_TRUE,
        REBASE_PRESERVE,
+       REBASE_MERGES,
        REBASE_INTERACTIVE
 };
 
 /**
  * Parses the value of --rebase. If value is a false value, returns
  * REBASE_FALSE. If value is a true value, returns REBASE_TRUE. If value is
- * "preserve", returns REBASE_PRESERVE. If value is a invalid value, dies with
- * a fatal error if fatal is true, otherwise returns REBASE_INVALID.
+ * "merges", returns REBASE_MERGES. If value is "preserve", returns
+ * REBASE_PRESERVE. If value is a invalid value, dies with a fatal error if
+ * fatal is true, otherwise returns REBASE_INVALID.
  */
 static enum rebase_type parse_config_rebase(const char *key, const char *value,
                int fatal)
@@ -47,6 +49,8 @@ static enum rebase_type parse_config_rebase(const char *key, 
const char *value,
                return REBASE_TRUE;
        else if (!strcmp(value, "preserve"))
                return REBASE_PRESERVE;
+       else if (!strcmp(value, "merges"))
+               return REBASE_MERGES;
        else if (!strcmp(value, "interactive"))
                return REBASE_INTERACTIVE;
 
@@ -130,7 +134,7 @@ static struct option pull_options[] = {
        /* Options passed to git-merge or git-rebase */
        OPT_GROUP(N_("Options related to merging")),
        { OPTION_CALLBACK, 'r', "rebase", &opt_rebase,
-         "false|true|preserve|interactive",
+         "false|true|merges|preserve|interactive",
          N_("incorporate changes by rebasing rather than merging"),
          PARSE_OPT_OPTARG, parse_opt_rebase },
        OPT_PASSTHRU('n', NULL, &opt_diffstat, NULL,
@@ -800,7 +804,9 @@ static int run_rebase(const struct object_id *curr_head,
        argv_push_verbosity(&args);
 
        /* Options passed to git-rebase */
-       if (opt_rebase == REBASE_PRESERVE)
+       if (opt_rebase == REBASE_MERGES)
+               argv_array_push(&args, "--rebase-merges");
+       else if (opt_rebase == REBASE_PRESERVE)
                argv_array_push(&args, "--preserve-merges");
        else if (opt_rebase == REBASE_INTERACTIVE)
                argv_array_push(&args, "--interactive");
diff --git a/builtin/remote.c b/builtin/remote.c
index 805ffc05cdb..45c9219e07a 100644
--- a/builtin/remote.c
+++ b/builtin/remote.c
@@ -245,7 +245,9 @@ static int add(int argc, const char **argv)
 struct branch_info {
        char *remote_name;
        struct string_list merge;
-       enum { NO_REBASE, NORMAL_REBASE, INTERACTIVE_REBASE } rebase;
+       enum {
+               NO_REBASE, NORMAL_REBASE, INTERACTIVE_REBASE, REBASE_MERGES
+       } rebase;
 };
 
 static struct string_list branch_list = STRING_LIST_INIT_NODUP;
@@ -306,6 +308,8 @@ static int config_read_branches(const char *key, const char 
*value, void *cb)
                                info->rebase = v;
                        else if (!strcmp(value, "preserve"))
                                info->rebase = NORMAL_REBASE;
+                       else if (!strcmp(value, "merges"))
+                               info->rebase = REBASE_MERGES;
                        else if (!strcmp(value, "interactive"))
                                info->rebase = INTERACTIVE_REBASE;
                }
@@ -963,9 +967,15 @@ static int show_local_info_item(struct string_list_item 
*item, void *cb_data)
 
        printf("    %-*s ", show_info->width, item->string);
        if (branch_info->rebase) {
-               printf_ln(branch_info->rebase == INTERACTIVE_REBASE
-                         ? _("rebases interactively onto remote %s")
-                         : _("rebases onto remote %s"), 
merge->items[0].string);
+               const char *msg;
+               if (branch_info->rebase == INTERACTIVE_REBASE)
+                       msg = _("rebases interactively onto remote %s");
+               else if (branch_info->rebase == REBASE_MERGES)
+                       msg = _("rebases interactively (with merges) onto "
+                               "remote %s");
+               else
+                       msg = _("rebases onto remote %s");
+               printf_ln(msg, merge->items[0].string);
                return 0;
        } else if (show_info->any_rebase) {
                printf_ln(_(" merges with remote %s"), merge->items[0].string);
diff --git a/contrib/completion/git-completion.bash 
b/contrib/completion/git-completion.bash
index d4c0a995c39..6af65155c59 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2120,7 +2120,7 @@ _git_config ()
                return
                ;;
        branch.*.rebase)
-               __gitcomp "false true preserve interactive"
+               __gitcomp "false true merges preserve interactive"
                return
                ;;
        remote.pushdefault)
-- 
2.17.0.windows.1.4.g7e4058d72e3


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