cherry-pick/revert: add support for -X/--strategy-option

For example, this would allow cherry-picking or reverting patches from
a piece of history with a different end-of-line style, like so:

	$ git revert -Xrenormalize old-problematic-commit

Currently that is possible with manual use of merge-recursive but the
cherry-pick/revert porcelain does not expose the functionality.

While at it, document the existing support for --strategy.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-cherry-pick.txt b/Documentation/git-cherry-pick.txt
index 73008705ebe304c8d2a2d089e9328be369c50fc6..749d68a72bf720d82260fe175be0824f7ad069eb 100644 (file)
--- a/Documentation/git-cherry-pick.txt
+++ b/Documentation/git-cherry-pick.txt
@@ -79,6 +79,16 @@ effect to your index in a row.
        cherry-pick'ed commit, then a fast forward to this commit will
        be performed.
 
+--strategy=<strategy>::
+       Use the given merge strategy.  Should only be used once.
+       See the MERGE STRATEGIES section in linkgit:git-merge[1]
+       for details.
+
+-X<option>::
+--strategy-option=<option>::
+       Pass the merge strategy-specific option through to the
+       merge strategy.  See linkgit:git-merge[1] for details.
+
 EXAMPLES
 --------
 git cherry-pick master::
@@ -120,6 +130,28 @@ git rev-list --reverse master \-- README | git cherry-pick -n --stdin::
        so the result can be inspected and made into a single new
        commit if suitable.
 
+The following sequence attempts to backport a patch, bails out because
+the code the patch applies to has changed too much, and then tries
+again, this time exercising more care about matching up context lines.
+
+------------
+$ git cherry-pick topic^             <1>
+$ git diff                           <2>
+$ git reset --merge ORIG_HEAD        <3>
+$ git cherry-pick -Xpatience topic^  <4>
+------------
+<1> apply the change that would be shown by `git show topic^`.
+In this example, the patch does not apply cleanly, so
+information about the conflict is written to the index and
+working tree and no new commit results.
+<2> summarize changes to be reconciled
+<3> cancel the cherry-pick.  In other words, return to the
+pre-cherry-pick state, preserving any local modifications you had in
+the working tree.
+<4> try to apply the change introduced by `topic^` again,
+spending extra time to avoid mistakes based on incorrectly matching
+context lines.
+
 Author
 ------
 Written by Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-revert.txt b/Documentation/git-revert.txt
index 752fc88e768e4b8e1afddad4bdd7833cf20978c7..45be851750c2ce81500765f6dfbd23578c68abda 100644 (file)
--- a/Documentation/git-revert.txt
+++ b/Documentation/git-revert.txt
@@ -80,6 +80,16 @@ effect to your index in a row.
 --signoff::
        Add Signed-off-by line at the end of the commit message.
 
+--strategy=<strategy>::
+       Use the given merge strategy.  Should only be used once.
+       See the MERGE STRATEGIES section in linkgit:git-merge[1]
+       for details.
+
+-X<option>::
+--strategy-option=<option>::
+       Pass the merge strategy-specific option through to the
+       merge strategy.  See linkgit:git-merge[1] for details.
+
 EXAMPLES
 --------
 git revert HEAD~3::

diff --git a/builtin/merge.c b/builtin/merge.c
index 42fff387e69d9b5412e8e776aed3272b78ebe758..9403747b6afeb89a9079e7203f5a027014411495 100644 (file)
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -582,7 +582,8 @@ static void write_tree_trivial(unsigned char *sha1)
                die("git write-tree failed to write a tree");
 }
 
-int try_merge_command(const char *strategy, struct commit_list *common,
+int try_merge_command(const char *strategy, size_t xopts_nr,
+                     const char **xopts, struct commit_list *common,
                      const char *head_arg, struct commit_list *remotes)
 {
        const char **args;
@@ -680,7 +681,8 @@ static int try_merge_strategy(const char *strategy, struct commit_list *common,
                rollback_lock_file(lock);
                return clean ? 0 : 1;
        } else {
-               return try_merge_command(strategy, common, head_arg, remoteheads);
+               return try_merge_command(strategy, xopts_nr, xopts,
+                                               common, head_arg, remoteheads);
        }
 }
 

diff --git a/builtin/revert.c b/builtin/revert.c
index bb6e9e83b756b47dae449064ca7762fe3558fc0e..dc1b702edc6b4bd95ebf41c12bf1da6fe9d6850d 100644 (file)
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -44,7 +44,11 @@ static const char **commit_argv;
 static int allow_rerere_auto;
 
 static const char *me;
+
+/* Merge strategy. */
 static const char *strategy;
+static const char **xopts;
+static size_t xopts_nr, xopts_alloc;
 
 #define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
 
@@ -55,6 +59,17 @@ static const char * const *revert_or_cherry_pick_usage(void)
        return action == REVERT ? revert_usage : cherry_pick_usage;
 }
 
+static int option_parse_x(const struct option *opt,
+                         const char *arg, int unset)
+{
+       if (unset)
+               return 0;
+
+       ALLOC_GROW(xopts, xopts_nr + 1, xopts_alloc);
+       xopts[xopts_nr++] = xstrdup(arg);
+       return 0;
+}
+
 static void parse_args(int argc, const char **argv)
 {
        const char * const * usage_str = revert_or_cherry_pick_usage();
@@ -67,6 +82,8 @@ static void parse_args(int argc, const char **argv)
                OPT_INTEGER('m', "mainline", &mainline, "parent number"),
                OPT_RERERE_AUTOUPDATE(&allow_rerere_auto),
                OPT_STRING(0, "strategy", &strategy, "strategy", "merge strategy"),
+               OPT_CALLBACK('X', "strategy-option", &xopts, "option",
+                       "option for merge strategy", option_parse_x),
                OPT_END(),
                OPT_END(),
                OPT_END(),
@@ -311,18 +328,13 @@ static int do_recursive_merge(struct commit *base, struct commit *next,
        struct merge_options o;
        struct tree *result, *next_tree, *base_tree, *head_tree;
        int clean, index_fd;
+       const char **xopt;
        static struct lock_file index_lock;
 
        index_fd = hold_locked_index(&index_lock, 1);
 
        read_cache();
 
-       /*
-        * NEEDSWORK: cherry-picking between branches with
-        * different end-of-line normalization is a pain;
-        * plumb in an option to set o.renormalize?
-        * (or better: arbitrary -X options)
-        */
        init_merge_options(&o);
        o.ancestor = base ? base_label : "(empty tree)";
        o.branch1 = "HEAD";
@@ -332,6 +344,9 @@ static int do_recursive_merge(struct commit *base, struct commit *next,
        next_tree = next ? next->tree : empty_tree();
        base_tree = base ? base->tree : empty_tree();
 
+       for (xopt = xopts; xopt != xopts + xopts_nr; xopt++)
+               parse_merge_opt(&o, *xopt);
+
        clean = merge_trees(&o,
                            head_tree,
                            next_tree, base_tree, &result);
@@ -503,7 +518,7 @@ static int do_pick_commit(void)
 
                commit_list_insert(base, &common);
                commit_list_insert(next, &remotes);
-               res = try_merge_command(strategy, common,
+               res = try_merge_command(strategy, xopts_nr, xopts, common,
                                        sha1_to_hex(head), remotes);
                free_commit_list(common);
                free_commit_list(remotes);

diff --git a/contrib/examples/git-revert.sh b/contrib/examples/git-revert.sh
index 60a05a8b978345224c0313edb8060f5a7c2ccb54..6bf155cbdb61498bdaf84712a2dea6fb05361ce2 100755 (executable)
--- a/contrib/examples/git-revert.sh
+++ b/contrib/examples/git-revert.sh
@@ -26,6 +26,7 @@ require_work_tree
 cd_to_toplevel
 
 no_commit=
+xopt=
 while case "$#" in 0) break ;; esac
 do
        case "$1" in
@@ -44,6 +45,16 @@ do
        -x|--i-really-want-to-expose-my-private-commit-object-name)
                replay=
                ;;
+       -X?*)
+               xopt="$xopt$(git rev-parse --sq-quote "--${1#-X}")"
+               ;;
+       --strategy-option=*)
+               xopt="$xopt$(git rev-parse --sq-quote "--${1#--strategy-option=}")"
+               ;;
+       -X|--strategy-option)
+               shift
+               xopt="$xopt$(git rev-parse --sq-quote "--$1")"
+               ;;
        -*)
                usage
                ;;
@@ -159,7 +170,7 @@ export GITHEAD_$head GITHEAD_$next
 # and $prev on top of us (when reverting), or the change between
 # $prev and $commit on top of us (when cherry-picking or replaying).
 
-git-merge-recursive $base -- $head $next &&
+eval "git merge-recursive $xopt $base -- $head $next" &&
 result=$(git-write-tree 2>/dev/null) || {
        mv -f .msg "$GIT_DIR/MERGE_MSG"
        {

diff --git a/merge-recursive.h b/merge-recursive.h
index c8135b0ec70cc2eb92e5a6fd9353a134fda6b7bf..981ed6ac94b5ed73f15a3b0dca723586374ca0b8 100644 (file)
--- a/merge-recursive.h
+++ b/merge-recursive.h
@@ -57,6 +57,8 @@ struct tree *write_tree_from_memory(struct merge_options *o);
 int parse_merge_opt(struct merge_options *out, const char *s);
 
 /* builtin/merge.c */
-int try_merge_command(const char *strategy, struct commit_list *common, const char *head_arg, struct commit_list *remotes);
+int try_merge_command(const char *strategy, size_t xopts_nr,
+               const char **xopts, struct commit_list *common,
+               const char *head_arg, struct commit_list *remotes);
 
 #endif

diff --git a/t/t3032-merge-recursive-options.sh b/t/t3032-merge-recursive-options.sh
index 2293797553d49c5221da10ca17f97eeba1f5d29d..796f616abf17f40e59212b7abb80867f851baa55 100755 (executable)
--- a/t/t3032-merge-recursive-options.sh
+++ b/t/t3032-merge-recursive-options.sh
@@ -107,6 +107,20 @@ test_expect_success '--ignore-space-change makes merge succeed' '
        git merge-recursive --ignore-space-change HEAD^ -- HEAD remote
 '
 
+test_expect_success 'naive cherry-pick fails' '
+       git read-tree --reset -u HEAD &&
+       test_must_fail git cherry-pick --no-commit remote &&
+       git read-tree --reset -u HEAD &&
+       test_must_fail git cherry-pick remote &&
+       test_must_fail git update-index --refresh &&
+       grep "<<<<<<" text.txt
+'
+
+test_expect_success '-Xignore-space-change makes cherry-pick succeed' '
+       git read-tree --reset -u HEAD &&
+       git cherry-pick --no-commit -Xignore-space-change remote
+'
+
 test_expect_success '--ignore-space-change: our w/s-only change wins' '
        q_to_cr <<-\EOF >expected &&
            justice and holiness and is the nurse of his age and theQ