This will enable users to implement bisecting on first parents
which can be useful for when the commits from a feature branch
that we want to merge are not always tested.
Signed-off-by: Tiago Botelho <tiagonbotelho@xxxxxxxxxxx>
---
This patch adds all Junio's suggestions, namely do_find_bisection() being
broken when assigning q's weight to p if in first parent mode and q being
not UNINTERESTING and its weight still not being known.
The graph displayed in the unit tests was also changed from being top-bottom
to be left-right in order to keep it consistent with graphs in other tests.
bisect.c | 45 ++++++++++++++++++++++++++++++---------------
bisect.h | 3 ++-
builtin/rev-list.c | 3 +++
revision.c | 3 ---
t/t6002-rev-list-bisect.sh | 37 +++++++++++++++++++++++++++++++++++++
5 files changed, 72 insertions(+), 19 deletions(-)
diff --git a/bisect.c b/bisect.c
index 4eafc8262..e58cb8d62 100644
--- a/bisect.c
+++ b/bisect.c
@@ -33,6 +33,8 @@ static const char *term_good;
*
* We care just barely enough to avoid recursing for
* non-merge entries.
+ *
+ * Note: This function does not support the usage --first-parent.
*/
static int count_distance(struct commit_list *entry)
{
@@ -82,15 +84,16 @@ static inline void weight_set(struct commit_list *elem, int weight)
*((int*)(elem->item->util)) = weight;
}
-static int count_interesting_parents(struct commit *commit)
+static int count_interesting_parents(struct commit *commit, unsigned bisect_flags)
{
struct commit_list *p;
int count;
for (count = 0, p = commit->parents; p; p = p->next) {
- if (p->item->object.flags & UNINTERESTING)
- continue;
- count++;
+ if (!(p->item->object.flags & UNINTERESTING))
+ count++;
+ if (bisect_flags & BISECT_FIRST_PARENT)
+ break;
}
return count;
}
@@ -117,10 +120,10 @@ static inline int halfway(struct commit_list *p, int nr)
}
#if !DEBUG_BISECT
-#define show_list(a,b,c,d) do { ; } while (0)
+#define show_list(a,b,c,d,e) do { ; } while (0)
#else
static void show_list(const char *debug, int counted, int nr,
- struct commit_list *list)
+ struct commit_list *list, unsigned bisect_flags)
{
struct commit_list *p;
@@ -146,10 +149,14 @@ static void show_list(const char *debug, int counted, int nr,
else
fprintf(stderr, "---");
fprintf(stderr, " %.*s", 8, oid_to_hex(&commit->object.oid));
- for (pp = commit->parents; pp; pp = pp->next)
+ for (pp = commit->parents; pp; pp = pp->next) {
fprintf(stderr, " %.*s", 8,
oid_to_hex(&pp->item->object.oid));
+ if (bisect_flags & BISECT_FIRST_PARENT)
+ break;
+ }
+
subject_len = find_commit_subject(buf, &subject_start);
if (subject_len)
fprintf(stderr, " %.*s", subject_len, subject_start);
@@ -267,13 +274,13 @@ static struct commit_list *do_find_bisection(struct commit_list *list,
unsigned flags = commit->object.flags;
p->item->util = &weights[n++];
- switch (count_interesting_parents(commit)) {
+ switch (count_interesting_parents(commit, bisect_flags)) {
case 0:
if (!(flags & TREESAME)) {
weight_set(p, 1);
counted++;
show_list("bisection 2 count one",
- counted, nr, list);
+ counted, nr, list, bisect_flags);
}
/*
* otherwise, it is known not to reach any
@@ -289,7 +296,7 @@ static struct commit_list *do_find_bisection(struct commit_list *list,
}
}
- show_list("bisection 2 initialize", counted, nr, list);
+ show_list("bisection 2 initialize", counted, nr, list, bisect_flags);
/*
* If you have only one parent in the resulting set
@@ -319,7 +326,7 @@ static struct commit_list *do_find_bisection(struct commit_list *list,
counted++;
}
- show_list("bisection 2 count_distance", counted, nr, list);
+ show_list("bisection 2 count_distance", counted, nr, list, bisect_flags);
while (counted < nr) {
for (p = list; p; p = p->next) {
@@ -329,6 +336,11 @@ static struct commit_list *do_find_bisection(struct commit_list *list,
if (0 <= weight(p))
continue;
for (q = p->item->parents; q; q = q->next) {
+ if ((bisect_flags & BISECT_FIRST_PARENT)) {
+ if (weight(q) < 0)
+ q = NULL;
+ break;
+ }
if (q->item->object.flags & UNINTERESTING)
continue;
if (0 <= weight(q))
@@ -346,7 +358,7 @@ static struct commit_list *do_find_bisection(struct commit_list *list,
weight_set(p, weight(q)+1);
counted++;
show_list("bisection 2 count one",
- counted, nr, list);
+ counted, nr, list, bisect_flags);
}
else
weight_set(p, weight(q));
@@ -357,7 +369,7 @@ static struct commit_list *do_find_bisection(struct commit_list *list,
}
}
- show_list("bisection 2 counted all", counted, nr, list);
+ show_list("bisection 2 counted all", counted, nr, list, bisect_flags);
if (!find_all)
return best_bisection(list, nr);
@@ -372,7 +384,7 @@ void find_bisection(struct commit_list **commit_list, int *reaches,
struct commit_list *list, *p, *best, *next, *last;
int *weights;
- show_list("bisection 2 entry", 0, 0, *commit_list);
+ show_list("bisection 2 entry", 0, 0, *commit_list, bisect_flags);
/*
* Count the number of total and tree-changing items on the
@@ -395,7 +407,7 @@ void find_bisection(struct commit_list **commit_list, int *reaches,
on_list++;
}
list = last;
- show_list("bisection 2 sorted", 0, nr, list);
+ show_list("bisection 2 sorted", 0, nr, list, bisect_flags);
*all = nr;
weights = xcalloc(on_list, sizeof(*weights));
@@ -962,6 +974,9 @@ int bisect_next_all(const char *prefix, int no_checkout)
if (skipped_revs.nr)
bisect_flags |= BISECT_FIND_ALL;
+ if (revs.first_parent_only)
+ bisect_flags |= BISECT_FIRST_PARENT;
+
find_bisection(&revs.commits, &reaches, &all, bisect_flags);
revs.commits = managed_skipped(revs.commits, &tried);
diff --git a/bisect.h b/bisect.h
index 1d40a33ad..dfb7faeec 100644
--- a/bisect.h
+++ b/bisect.h
@@ -1,7 +1,8 @@
#ifndef BISECT_H
#define BISECT_H
-#define BISECT_FIND_ALL (1u<<0)
+#define BISECT_FIND_ALL (1u<<0)
+#define BISECT_FIRST_PARENT (1u<<1)
/*
* Find bisection. If something is found, `reaches` will be the number of
diff --git a/builtin/rev-list.c b/builtin/rev-list.c
index 8752f5bbe..66439e1b3 100644
--- a/builtin/rev-list.c
+++ b/builtin/rev-list.c
@@ -538,6 +538,9 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
if (bisect_list) {
int reaches, all;
+ if (revs.first_parent_only)
+ bisect_flags |= BISECT_FIRST_PARENT;
+
find_bisection(&revs.commits, &reaches, &all, bisect_flags);
if (bisect_show_vars)
diff --git a/revision.c b/revision.c
index 4e0e193e5..b9d063805 100644
--- a/revision.c
+++ b/revision.c
@@ -2474,9 +2474,6 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
if (!revs->reflog_info && revs->grep_filter.use_reflog_filter)
die("cannot use --grep-reflog without --walk-reflogs");
- if (revs->first_parent_only && revs->bisect)
- die(_("--first-parent is incompatible with --bisect"));
-
if (revs->expand_tabs_in_log < 0)
revs->expand_tabs_in_log = revs->expand_tabs_in_log_default;
diff --git a/t/t6002-rev-list-bisect.sh b/t/t6002-rev-list-bisect.sh
index a66140803..774d9a4fd 100755
--- a/t/t6002-rev-list-bisect.sh
+++ b/t/t6002-rev-list-bisect.sh
@@ -263,4 +263,41 @@ test_expect_success 'rev-parse --bisect can default to good/bad refs' '
test_cmp expect.sorted actual.sorted
'
+# We generate the following commit graph:
+#
+# B - C
+# / \
+# A FX
+# \ /
+# D - EX
+
+test_expect_success 'setup' '
+ test_commit A &&
+ test_commit B &&
+ test_commit C &&
+ git reset --hard A &&
+ test_commit D &&
+ test_commit EX &&
+ test_merge FX C
+'
+
+test_output_expect_success "--bisect --first-parent" 'git rev-list --bisect --first-parent FX ^A' <<EOF
+$(git rev-parse EX)
+EOF
+
+test_output_expect_success "--bisect-vars --first-parent" 'git rev-list --bisect-vars --first-parent FX ^A' <<EOF
+bisect_rev='$(git rev-parse EX)'
+bisect_nr=1
+bisect_good=0
+bisect_bad=1
+bisect_all=3
+bisect_steps=1
+EOF
+
+test_output_expect_success "--bisect-all --first-parent" 'git rev-list --bisect-all --first-parent FX ^A' <<EOF
+$(git rev-parse EX) (dist=1)
+$(git rev-parse D) (dist=1)
+$(git rev-parse FX) (dist=0)
+EOF
+
test_done
--
2.16.3
