Permalink
Browse files

Merge branch 'tr/log-full-diff-keep-true-parents' into maint

Output from "git log --full-diff -- <pathspec>" looked strange,
because comparison was done with the previous ancestor that touched
the specified <pathspec>, causing the patches for paths outside the
pathspec to show more than the single commit has changed.

* tr/log-full-diff-keep-true-parents:
  log: use true parents for diff when walking reflogs
  log: use true parents for diff even when rewriting
  • Loading branch information...
2 parents 1e93c28 + 838f9a1 commit 6930cd10de930b09639e1dad7ae8d74f9128e404 @gitster gitster committed Sep 18, 2013
Showing with 134 additions and 3 deletions.
  1. +2 −1 combine-diff.c
  2. +16 −0 commit.c
  3. +3 −0 commit.h
  4. +1 −1 log-tree.c
  5. +64 −1 revision.c
  6. +20 −0 revision.h
  7. +22 −0 t/t1411-reflog-show.sh
  8. +6 −0 t/t6012-rev-list-simplify.sh
View
@@ -10,6 +10,7 @@
#include "refs.h"
#include "userdiff.h"
#include "sha1-array.h"
+#include "revision.h"
static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr, int n, int num_parent)
{
@@ -1383,7 +1384,7 @@ void diff_tree_combined(const unsigned char *sha1,
void diff_tree_combined_merge(const struct commit *commit, int dense,
struct rev_info *rev)
{
- struct commit_list *parent = commit->parents;
+ struct commit_list *parent = get_saved_parents(rev, commit);
struct sha1_array parents = SHA1_ARRAY_INIT;
while (parent) {
View
@@ -377,6 +377,22 @@ unsigned commit_list_count(const struct commit_list *l)
return c;
}
+struct commit_list *copy_commit_list(struct commit_list *list)
+{
+ struct commit_list *head = NULL;
+ struct commit_list **pp = &head;
+ while (list) {
+ struct commit_list *new;
+ new = xmalloc(sizeof(struct commit_list));
+ new->item = list->item;
+ new->next = NULL;
+ *pp = new;
+ pp = &new->next;
+ list = list->next;
+ }
+ return head;
+}
+
void free_commit_list(struct commit_list *list)
{
while (list) {
View
@@ -62,6 +62,9 @@ struct commit_list *commit_list_insert_by_date(struct commit *item,
struct commit_list **list);
void commit_list_sort_by_date(struct commit_list **list);
+/* Shallow copy of the input list */
+struct commit_list *copy_commit_list(struct commit_list *list);
+
void free_commit_list(struct commit_list *list);
/* Commit formats */
View
@@ -738,7 +738,7 @@ static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log
sha1 = commit->tree->object.sha1;
/* Root commit? */
- parents = commit->parents;
+ parents = get_saved_parents(opt, commit);
if (!parents) {
if (opt->show_root_diff) {
diff_root_tree_sha1(sha1, "", &opt->diffopt);
View
@@ -15,6 +15,7 @@
#include "string-list.h"
#include "line-log.h"
#include "mailmap.h"
+#include "commit-slab.h"
volatile show_early_output_fn_t show_early_output;
@@ -2763,7 +2764,7 @@ static int commit_match(struct commit *commit, struct rev_info *opt)
return retval;
}
-static inline int want_ancestry(struct rev_info *revs)
+static inline int want_ancestry(const struct rev_info *revs)
{
return (revs->rewrite_parents || revs->children.name);
}
@@ -2820,6 +2821,14 @@ enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
if (action == commit_show &&
!revs->show_all &&
revs->prune && revs->dense && want_ancestry(revs)) {
+ /*
+ * --full-diff on simplified parents is no good: it
+ * will show spurious changes from the commits that
+ * were elided. So we save the parents on the side
+ * when --full-diff is in effect.
+ */
+ if (revs->full_diff)
+ save_parents(revs, commit);
if (rewrite_parents(revs, commit, rewrite_one) < 0)
return commit_error;
}
@@ -2839,6 +2848,7 @@ static struct commit *get_revision_1(struct rev_info *revs)
free(entry);
if (revs->reflog_info) {
+ save_parents(revs, commit);
fake_reflog_parent(revs->reflog_info, commit);
commit->object.flags &= ~(ADDED | SEEN | SHOWN);
}
@@ -3038,6 +3048,8 @@ struct commit *get_revision(struct rev_info *revs)
c = get_revision_internal(revs);
if (c && revs->graph)
graph_update(revs->graph, c);
+ if (!c)
+ free_saved_parents(revs);
return c;
}
@@ -3069,3 +3081,54 @@ void put_revision_mark(const struct rev_info *revs, const struct commit *commit)
fputs(mark, stdout);
putchar(' ');
}
+
+define_commit_slab(saved_parents, struct commit_list *);
+
+#define EMPTY_PARENT_LIST ((struct commit_list *)-1)
+
+void save_parents(struct rev_info *revs, struct commit *commit)
+{
+ struct commit_list **pp;
+
+ if (!revs->saved_parents_slab) {
+ revs->saved_parents_slab = xmalloc(sizeof(struct saved_parents));
+ init_saved_parents(revs->saved_parents_slab);
+ }
+
+ pp = saved_parents_at(revs->saved_parents_slab, commit);
+
+ /*
+ * When walking with reflogs, we may visit the same commit
+ * several times: once for each appearance in the reflog.
+ *
+ * In this case, save_parents() will be called multiple times.
+ * We want to keep only the first set of parents. We need to
+ * store a sentinel value for an empty (i.e., NULL) parent
+ * list to distinguish it from a not-yet-saved list, however.
+ */
+ if (*pp)
+ return;
+ if (commit->parents)
+ *pp = copy_commit_list(commit->parents);
+ else
+ *pp = EMPTY_PARENT_LIST;
+}
+
+struct commit_list *get_saved_parents(struct rev_info *revs, const struct commit *commit)
+{
+ struct commit_list *parents;
+
+ if (!revs->saved_parents_slab)
+ return commit->parents;
+
+ parents = *saved_parents_at(revs->saved_parents_slab, commit);
+ if (parents == EMPTY_PARENT_LIST)
+ return NULL;
+ return parents;
+}
+
+void free_saved_parents(struct rev_info *revs)
+{
+ if (revs->saved_parents_slab)
+ clear_saved_parents(revs->saved_parents_slab);
+}
View
@@ -25,6 +25,7 @@
struct rev_info;
struct log_info;
struct string_list;
+struct saved_parents;
struct rev_cmdline_info {
unsigned int nr;
@@ -187,6 +188,9 @@ struct rev_info {
/* line level range that we are chasing */
struct decoration line_log_data;
+
+ /* copies of the parent lists, for --full-diff display */
+ struct saved_parents *saved_parents_slab;
};
#define REV_TREE_SAME 0
@@ -273,4 +277,20 @@ typedef enum rewrite_result (*rewrite_parent_fn_t)(struct rev_info *revs, struct
extern int rewrite_parents(struct rev_info *revs, struct commit *commit,
rewrite_parent_fn_t rewrite_parent);
+
+/*
+ * Save a copy of the parent list, and return the saved copy. This is
+ * used by the log machinery to retrieve the original parents when
+ * commit->parents has been modified by history simpification.
+ *
+ * You may only call save_parents() once per commit (this is checked
+ * for non-root commits).
+ *
+ * get_saved_parents() will transparently return commit->parents if
+ * history simplification is off.
+ */
+extern void save_parents(struct rev_info *revs, struct commit *commit);
+extern struct commit_list *get_saved_parents(struct rev_info *revs, const struct commit *commit);
+extern void free_saved_parents(struct rev_info *revs);
+
#endif
View
@@ -144,4 +144,26 @@ test_expect_success 'empty reflog file' '
test_cmp expect actual
'
+# This guards against the alternative of showing the diffs vs. the
+# reflog ancestor. The reflog used is designed to list the commits
+# more than once, so as to exercise the corresponding logic.
+test_expect_success 'git log -g -p shows diffs vs. parents' '
+ test_commit two &&
+ git branch flipflop &&
+ git update-ref refs/heads/flipflop -m flip1 HEAD^ &&
+ git update-ref refs/heads/flipflop -m flop1 HEAD &&
+ git update-ref refs/heads/flipflop -m flip2 HEAD^ &&
+ git log -g -p flipflop >reflog &&
+ grep -v ^Reflog reflog >actual &&
+ git log -1 -p HEAD^ >log.one &&
+ git log -1 -p HEAD >log.two &&
+ (
+ cat log.one; echo
+ cat log.two; echo
+ cat log.one; echo
+ cat log.two
+ ) >expect &&
+ test_cmp expect actual
+'
+
test_done
@@ -127,4 +127,10 @@ test_expect_success 'full history simplification without parent' '
}
'
+test_expect_success '--full-diff is not affected by --parents' '
+ git log -p --pretty="%H" --full-diff -- file >expected &&
+ git log -p --pretty="%H" --full-diff --parents -- file >actual &&
+ test_cmp expected actual
+'
+
test_done

0 comments on commit 6930cd1

Please sign in to comment.