If rebase.autoStash configuration variable is set, there is no way to
override it for "git pull --rebase" from the command line.

Teach "git pull --rebase" the --[no-]autostash command line flag which
overrides the current value of rebase.autoStash, if set. As "git rebase"
understands the --[no-]autostash option, it's just a matter of passing
the option to underlying "git rebase" when "git pull --rebase" is called.

Also introduce a callback function to read config variables.

Helped-by: Matthieu Moy <matthieu....@grenoble-inp.fr>
Helped-by: Junio C Hamano <gits...@pobox.com>
Helped-by: Paul Tan <pyoka...@gmail.com>
Helped-by: Eric Sunshine <sunsh...@sunshineco.com>
Signed-off-by: Mehul Jain <mehul.jain2...@gmail.com>
---
Previous patches: $gname287709

Changes: 
* Documentation modified
* Introduced a callback function to read config variables.
* Introduce two new tests
* Modified previous tests because:
        
        if worktree is dirty and --no-autostash is passed then git-pull
        should die before git-fetch is called, hence the error message 
        must be: 
        
        "Cannot pull with rebase: Your index contains uncommitted changes."

        Whereas if git-fetch is invoked and --no-autostash is passed to
        git-rebase then error message is:
        
        "Cannot rebase: Your index contains uncommitted changes."

        This test will prevent_future_changes by other people to break the
        code which may cause git-fetch being called even if worktree is dirty
        with --no-autostash option.

 Documentation/git-pull.txt |  9 +++++++++
 builtin/pull.c             | 34 ++++++++++++++++++++++++++++------
 t/t5520-pull.sh            | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 77 insertions(+), 6 deletions(-)

diff --git a/Documentation/git-pull.txt b/Documentation/git-pull.txt
index a62a2a6..393ac7d 100644
--- a/Documentation/git-pull.txt
+++ b/Documentation/git-pull.txt
@@ -128,6 +128,15 @@ unless you have read linkgit:git-rebase[1] carefully.
 --no-rebase::
        Override earlier --rebase.
 
+--autostash::
+--no-autostash::
+       Before starting rebase, stash local modifications away (see
+       linkgit:git-stash.txt[1]) if needed, and apply the stash when
+       done (this option is only valid when '--rebase' is used).
++
+'--no-autostash' is useful to override the 'rebase.autoStash'
+configuration variable (see linkgit:git-config[1]).
+
 Options related to fetching
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/builtin/pull.c b/builtin/pull.c
index 10eff03..b25c53d 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -85,6 +85,8 @@ static char *opt_squash;
 static char *opt_commit;
 static char *opt_edit;
 static char *opt_ff;
+static int opt_autostash = -1;
+static int config_autostash = -1;
 static char *opt_verify_signatures;
 static struct argv_array opt_strategies = ARGV_ARRAY_INIT;
 static struct argv_array opt_strategy_opts = ARGV_ARRAY_INIT;
@@ -146,6 +148,8 @@ static struct option pull_options[] = {
        OPT_PASSTHRU(0, "ff-only", &opt_ff, NULL,
                N_("abort if fast-forward is not possible"),
                PARSE_OPT_NOARG | PARSE_OPT_NONEG),
+       OPT_BOOL(0, "autostash", &opt_autostash,
+               N_("automatically stash/stash pop before and after rebase")),
        OPT_PASSTHRU(0, "verify-signatures", &opt_verify_signatures, NULL,
                N_("verify that the named commit has a valid GPG signature"),
                PARSE_OPT_NOARG),
@@ -306,6 +310,18 @@ static enum rebase_type config_get_rebase(void)
 }
 
 /**
+ * Read config variables.
+ */
+static int git_pull_config(const char *var, const char *value, void *cb)
+{
+       if (!strcmp(var,"rebase.autostash")) {
+               config_autostash = git_config_bool(var,value);
+               return 0;
+       }
+       return git_default_config(var, value, cb);
+}
+
+/**
  * Returns 1 if there are unstaged changes, 0 otherwise.
  */
 static int has_unstaged_changes(const char *prefix)
@@ -789,6 +805,10 @@ static int run_rebase(const unsigned char *curr_head,
        argv_array_pushv(&args, opt_strategy_opts.argv);
        if (opt_gpg_sign)
                argv_array_push(&args, opt_gpg_sign);
+       if (opt_autostash == 1)
+               argv_array_push(&args, "--autostash");
+       else if (opt_autostash == 0)
+               argv_array_push(&args, "--no-autostash");
 
        argv_array_push(&args, "--onto");
        argv_array_push(&args, sha1_to_hex(merge_head));
@@ -823,7 +843,7 @@ int cmd_pull(int argc, const char **argv, const char 
*prefix)
        if (opt_rebase < 0)
                opt_rebase = config_get_rebase();
 
-       git_config(git_default_config, NULL);
+       git_config(git_pull_config, NULL);
 
        if (read_cache_unmerged())
                die_resolve_conflict("Pull");
@@ -835,18 +855,20 @@ int cmd_pull(int argc, const char **argv, const char 
*prefix)
                hashclr(orig_head);
 
        if (opt_rebase) {
-               int autostash = 0;
-
                if (is_null_sha1(orig_head) && !is_cache_unborn())
                        die(_("Updating an unborn branch with changes added to 
the index."));
 
-               git_config_get_bool("rebase.autostash", &autostash);
-               if (!autostash)
+               if (opt_autostash == -1)
+                       opt_autostash = config_autostash;
+
+               if (opt_autostash == 0 || opt_autostash == -1)
                        die_on_unclean_work_tree(prefix);
 
                if (get_rebase_fork_point(rebase_fork_point, repo, *refspecs))
                        hashclr(rebase_fork_point);
-       }
+       } else
+               if (opt_autostash != -1)
+                       die(_("--[no-]autostash option is only valid with 
--rebase."));
 
        if (run_fetch(repo, refspecs))
                return 1;
diff --git a/t/t5520-pull.sh b/t/t5520-pull.sh
index c952d5e..cc6a481 100755
--- a/t/t5520-pull.sh
+++ b/t/t5520-pull.sh
@@ -256,6 +256,46 @@ test_expect_success 'pull --rebase succeeds with dirty 
working directory and reb
        test "$(cat file)" = "modified again"
 '
 
+test_expect_success 'pull --rebase: --autostash overrides rebase.autostash' '
+       test_config rebase.autostash false &&
+       git reset --hard before-rebase &&
+       echo dirty >new_file &&
+       git add new_file &&
+       git pull --rebase --autostash . copy &&
+       test_cmp_rev HEAD^ copy &&
+       test "$(cat new_file)" = dirty &&
+       test "$(cat file)" = "modified again"
+'
+
+test_expect_success 'pull --rebase --autostash works with rebase.autostash set 
true' '
+       test_config rebase.autostash true &&
+       git reset --hard before-rebase &&
+       echo dirty >new_file &&
+       git add new_file &&
+       git pull --rebase --autostash . copy &&
+       test_cmp_rev HEAD^ copy &&
+       test "$(cat new_file)" = dirty &&
+       test "$(cat file)" = "modified again"
+'
+
+test_expect_success 'pull --rebase: --no-autostash overrides rebase.autostash' 
'
+       test_config rebase.autostash true &&
+       git reset --hard before-rebase &&
+       echo dirty >new_file &&
+       git add new_file &&
+       test_must_fail git pull --rebase --no-autostash . copy 2>err &&
+       test_i18ngrep "Cannot pull with rebase: Your index contains uncommitted 
changes." err
+'
+
+test_expect_success 'pull --rebase --no-autostash works with rebase.autostash 
set false' '
+       test_config rebase.autostash false &&
+       git reset --hard before-rebase &&
+       echo dirty >new_file &&
+       git add new_file &&
+       test_must_fail git pull --rebase --no-autostash . copy 2>err &&
+       test_i18ngrep "Cannot pull with rebase: Your index contains uncommitted 
changes." err
+'
+
 test_expect_success 'pull.rebase' '
        git reset --hard before-rebase &&
        test_config pull.rebase true &&
-- 
2.7.1.340.g69eb491.dirty

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