[PATCH 8/9] pull: update docs & code for option compatibility with rebasing

["Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>]

From: Elijah Newren <newren@gmail.com>

git-pull.txt includes merge-options.txt, which is written assuming
merges will happen.  git-pull has allowed rebases for many years; update
the documentation to reflect that.

While at it, pass any `--signoff` flag through to the rebase backend too
so that we don't have to document it as merge-specific.  Rebase has
supported the --signoff flag for years now as well.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 Documentation/git-pull.txt      |  2 ++
 Documentation/merge-options.txt | 25 +++++++++++++++++++++++++
 builtin/pull.c                  |  2 ++
 3 files changed, 29 insertions(+)

diff --git a/Documentation/git-pull.txt b/Documentation/git-pull.txt
index cad3f6bfcee..6e6e95a7595 100644
--- a/Documentation/git-pull.txt
+++ b/Documentation/git-pull.txt
@@ -125,6 +125,8 @@ When false, merge the current branch into the upstream branch.
 +
 When `interactive`, enable the interactive mode of rebase.
 +
+Note that `--ff-only` takes precedence over any `--rebase` flag.
++
 See `pull.rebase`, `branch.<name>.rebase` and `branch.autoSetupRebase` in
 linkgit:git-config[1] if you want to make `git pull` always use
 `--rebase` instead of merging.
diff --git a/Documentation/merge-options.txt b/Documentation/merge-options.txt
index eb0aabd396f..3b70abf3c87 100644
--- a/Documentation/merge-options.txt
+++ b/Documentation/merge-options.txt
@@ -2,6 +2,9 @@
 --no-commit::
 	Perform the merge and commit the result. This option can
 	be used to override --no-commit.
+ifdef::git-pull[]
+	Only useful when merging.
+endif::git-pull[]
 +
 With --no-commit perform the merge and stop just before creating
 a merge commit, to give the user a chance to inspect and further
@@ -58,6 +61,10 @@ could instead be resolved as a fast-forward.
 +
 With `--ff-only`, resolve the merge as a fast-forward when possible.
 When not possible, refuse to merge and exit with a non-zero status.
+ifdef::git-pull[]
++
+Note that `--no-ff` and `--ff` are ignored when rebasing is requested.
+endif::git-pull[]
 
 -S[<keyid>]::
 --gpg-sign[=<keyid>]::
@@ -73,6 +80,9 @@ When not possible, refuse to merge and exit with a non-zero status.
 	In addition to branch names, populate the log message with
 	one-line descriptions from at most <n> actual commits that are being
 	merged. See also linkgit:git-fmt-merge-msg[1].
+ifdef::git-pull[]
+	Only useful when merging.
+endif::git-pull[]
 +
 With --no-log do not list one-line descriptions from the
 actual commits being merged.
@@ -102,10 +112,17 @@ With --no-squash perform the merge and commit the result. This
 option can be used to override --squash.
 +
 With --squash, --commit is not allowed, and will fail.
+ifdef::git-pull[]
++
+Only useful when merging.
+endif::git-pull[]
 
 --no-verify::
 	This option bypasses the pre-merge and commit-msg hooks.
 	See also linkgit:githooks[5].
+ifdef::git-pull[]
+	Only useful when merging.
+endif::git-pull[]
 
 -s <strategy>::
 --strategy=<strategy>::
@@ -127,6 +144,10 @@ With --squash, --commit is not allowed, and will fail.
 	default trust model, this means the signing key has been signed by
 	a trusted key.  If the tip commit of the side branch is not signed
 	with a valid key, the merge is aborted.
+ifdef::git-pull[]
++
+Only useful when merging.
+endif::git-pull[]
 
 --summary::
 --no-summary::
@@ -166,3 +187,7 @@ endif::git-pull[]
 	projects that started their lives independently. As that is
 	a very rare occasion, no configuration variable to enable
 	this by default exists and will not be added.
+ifdef::git-pull[]
++
+Only useful when merging.
+endif::git-pull[]
diff --git a/builtin/pull.c b/builtin/pull.c
index 2d7f2d765ab..3a61b92f328 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -893,6 +893,8 @@ static int run_rebase(const struct object_id *newbase,
 	strvec_pushv(&args, opt_strategy_opts.v);
 	if (opt_gpg_sign)
 		strvec_push(&args, opt_gpg_sign);
+	if (opt_signoff)
+		strvec_push(&args, opt_signoff);
 	if (opt_autostash == 0)
 		strvec_push(&args, "--no-autostash");
 	else if (opt_autostash == 1)
-- 
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