[PATCH 4/8] pull: remove support for `--rebase=preserve`

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

In preparation for `git-rebase--preserve-merges.sh` entering its after
life, we remove this (deprecated) option that would still rely on it.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 Documentation/config/branch.txt        |  4 ----
 Documentation/config/pull.txt          |  4 ----
 Documentation/git-pull.txt             |  6 +-----
 builtin/pull.c                         | 12 +++---------
 contrib/completion/git-completion.bash |  2 +-
 5 files changed, 5 insertions(+), 23 deletions(-)

diff --git a/Documentation/config/branch.txt b/Documentation/config/branch.txt
index a592d522a7..e9986ddd09 100644
--- a/Documentation/config/branch.txt
+++ b/Documentation/config/branch.txt
@@ -85,10 +85,6 @@ When `merges`, pass the `--rebase-merges` option to 'git rebase'
 so that the local merge commits are included in the rebase (see
 linkgit:git-rebase[1] for details).
 +
-When `preserve` (deprecated in favor of `merges`), also pass
-`--preserve-merges` along to 'git rebase' so that locally committed merge
-commits will not be flattened by running 'git pull'.
-+
 When the value is `interactive`, the rebase is run in interactive mode.
 +
 *NOTE*: this is a possibly dangerous operation; do *not* use
diff --git a/Documentation/config/pull.txt b/Documentation/config/pull.txt
index b87cab31b3..9f2dea0b34 100644
--- a/Documentation/config/pull.txt
+++ b/Documentation/config/pull.txt
@@ -18,10 +18,6 @@ When `merges`, pass the `--rebase-merges` option to 'git rebase'
 so that the local merge commits are included in the rebase (see
 linkgit:git-rebase[1] for details).
 +
-When `preserve` (deprecated in favor of `merges`), also pass
-`--preserve-merges` along to 'git rebase' so that locally committed merge
-commits will not be flattened by running 'git pull'.
-+
 When the value is `interactive`, the rebase is run in interactive mode.
 +
 *NOTE*: this is a possibly dangerous operation; do *not* use
diff --git a/Documentation/git-pull.txt b/Documentation/git-pull.txt
index dfb901f8b8..edda860a9a 100644
--- a/Documentation/git-pull.txt
+++ b/Documentation/git-pull.txt
@@ -101,7 +101,7 @@ Options related to merging
 include::merge-options.txt[]
 
 -r::
---rebase[=false|true|merges|preserve|interactive]::
+--rebase[=false|true|merges|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
@@ -112,10 +112,6 @@ When set to `merges`, rebase using `git rebase --rebase-merges` so that
 the local merge commits are included in the rebase (see
 linkgit:git-rebase[1] for details).
 +
-When set to `preserve` (deprecated in favor of `merges`), rebase with the
-`--preserve-merges` option passed to `git rebase` so that locally created
-merge commits will not be flattened.
-+
 When false, merge the current branch into the upstream branch.
 +
 When `interactive`, enable the interactive mode of rebase.
diff --git a/builtin/pull.c b/builtin/pull.c
index d25ff13a60..6c4d91d580 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -30,7 +30,6 @@ enum rebase_type {
 	REBASE_INVALID = -1,
 	REBASE_FALSE = 0,
 	REBASE_TRUE,
-	REBASE_PRESERVE,
 	REBASE_MERGES,
 	REBASE_INTERACTIVE
 };
@@ -38,9 +37,8 @@ enum rebase_type {
 /**
  * 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
- * "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.
+ * "merges", returns REBASE_MERGES. 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)
@@ -51,8 +49,6 @@ static enum rebase_type parse_config_rebase(const char *key, const char *value,
 		return REBASE_FALSE;
 	else if (v > 0)
 		return REBASE_TRUE;
-	else if (!strcmp(value, "preserve") || !strcmp(value, "p"))
-		return REBASE_PRESERVE;
 	else if (!strcmp(value, "merges") || !strcmp(value, "m"))
 		return REBASE_MERGES;
 	else if (!strcmp(value, "interactive") || !strcmp(value, "i"))
@@ -145,7 +141,7 @@ 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|merges|preserve|interactive)",
+	  "(false|true|merges|interactive)",
 	  N_("incorporate changes by rebasing rather than merging"),
 	  PARSE_OPT_OPTARG, parse_opt_rebase },
 	OPT_PASSTHRU('n', NULL, &opt_diffstat, NULL,
@@ -848,8 +844,6 @@ static int run_rebase(const struct object_id *curr_head,
 	/* Options passed to git-rebase */
 	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");
 	if (opt_diffstat)
diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 00fbe6c03d..5b37734ef1 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2276,7 +2276,7 @@ __git_complete_config_variable_value ()
 		return
 		;;
 	branch.*.rebase)
-		__gitcomp "false true merges preserve interactive" "" "$cur_"
+		__gitcomp "false true merges interactive" "" "$cur_"
 		return
 		;;
 	remote.pushdefault)
-- 
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