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@xxxxxxxxx>
---
Thoughts?
Documentation/git-cherry-pick.txt | 32 ++++++++++++++++++++++++++++++++
Documentation/git-revert.txt | 10 ++++++++++
builtin/merge.c | 6 ++++--
builtin/revert.c | 29 ++++++++++++++++++++++-------
contrib/examples/git-revert.sh | 13 ++++++++++++-
merge-recursive.h | 4 +++-
t/t3032-merge-recursive-options.sh | 14 ++++++++++++++
7 files changed, 97 insertions(+), 11 deletions(-)
diff --git a/Documentation/git-cherry-pick.txt b/Documentation/git-cherry-pick.txt
index 7300870..749d68a 100644
--- 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@xxxxxxxxx>
diff --git a/Documentation/git-revert.txt b/Documentation/git-revert.txt
index 752fc88..45be851 100644
--- 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 3921cd3..c57d06e 100644
--- 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 bb6e9e8..dc1b702 100644
--- 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 60a05a8..6bf155c 100755
--- 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 c8135b0..981ed6a 100644
--- 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 2293797..796f616 100755
--- 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
--
1.7.2.4
--
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