1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
#include "builtin.h"
#include "cache.h"
#include "config.h"
#include "commit.h"
#include "refs.h"
#include "diff.h"
#include "revision.h"
#include "parse-options.h"
#include "repository.h"
#include "commit-reach.h"
static int show_merge_base(struct commit **rev, int rev_nr, int show_all)
{
struct commit_list *result, *r;
result = get_merge_bases_many_dirty(rev[0], rev_nr - 1, rev + 1);
if (!result)
return 1;
for (r = result; r; r = r->next) {
printf("%s\n", oid_to_hex(&r->item->object.oid));
if (!show_all)
break;
}
free_commit_list(result);
return 0;
}
static const char * const merge_base_usage[] = {
N_("git merge-base [-a | --all] <commit> <commit>..."),
N_("git merge-base [-a | --all] --octopus <commit>..."),
N_("git merge-base --independent <commit>..."),
N_("git merge-base --is-ancestor <commit> <commit>"),
N_("git merge-base --fork-point <ref> [<commit>]"),
NULL
};
static struct commit *get_commit_reference(const char *arg)
{
struct object_id revkey;
struct commit *r;
if (get_oid(arg, &revkey))
die("Not a valid object name %s", arg);
r = lookup_commit_reference(the_repository, &revkey);
if (!r)
die("Not a valid commit name %s", arg);
return r;
}
static int handle_independent(int count, const char **args)
{
struct commit_list *revs = NULL, *rev;
int i;
for (i = count - 1; i >= 0; i--)
commit_list_insert(get_commit_reference(args[i]), &revs);
reduce_heads_replace(&revs);
if (!revs)
return 1;
for (rev = revs; rev; rev = rev->next)
printf("%s\n", oid_to_hex(&rev->item->object.oid));
free_commit_list(revs);
return 0;
}
static int handle_octopus(int count, const char **args, int show_all)
{
struct commit_list *revs = NULL;
struct commit_list *result, *rev;
int i;
for (i = count - 1; i >= 0; i--)
commit_list_insert(get_commit_reference(args[i]), &revs);
result = get_octopus_merge_bases(revs);
free_commit_list(revs);
reduce_heads_replace(&result);
if (!result)
return 1;
for (rev = result; rev; rev = rev->next) {
printf("%s\n", oid_to_hex(&rev->item->object.oid));
if (!show_all)
break;
}
free_commit_list(result);
return 0;
}
static int handle_is_ancestor(int argc, const char **argv)
{
struct commit *one, *two;
if (argc != 2)
die("--is-ancestor takes exactly two commits");
one = get_commit_reference(argv[0]);
two = get_commit_reference(argv[1]);
if (in_merge_bases(one, two))
return 0;
else
return 1;
}
static int handle_fork_point(int argc, const char **argv)
{
struct object_id oid;
struct commit *derived, *fork_point;
const char *commitname;
commitname = (argc == 2) ? argv[1] : "HEAD";
if (get_oid(commitname, &oid))
die("Not a valid object name: '%s'", commitname);
derived = lookup_commit_reference(the_repository, &oid);
fork_point = get_fork_point(argv[0], derived);
if (!fork_point)
return 1;
printf("%s\n", oid_to_hex(&fork_point->object.oid));
return 0;
}
int cmd_merge_base(int argc, const char **argv, const char *prefix)
{
struct commit **rev;
int rev_nr = 0;
int show_all = 0;
int cmdmode = 0;
int ret;
struct option options[] = {
OPT_BOOL('a', "all", &show_all, N_("output all common ancestors")),
OPT_CMDMODE(0, "octopus", &cmdmode,
N_("find ancestors for a single n-way merge"), 'o'),
OPT_CMDMODE(0, "independent", &cmdmode,
N_("list revs not reachable from others"), 'r'),
OPT_CMDMODE(0, "is-ancestor", &cmdmode,
N_("is the first one ancestor of the other?"), 'a'),
OPT_CMDMODE(0, "fork-point", &cmdmode,
N_("find where <commit> forked from reflog of <ref>"), 'f'),
OPT_END()
};
git_config(git_default_config, NULL);
argc = parse_options(argc, argv, prefix, options, merge_base_usage, 0);
if (cmdmode == 'a') {
if (argc < 2)
usage_with_options(merge_base_usage, options);
if (show_all)
die(_("options '%s' and '%s' cannot be used together"),
"--is-ancestor", "--all");
return handle_is_ancestor(argc, argv);
}
if (cmdmode == 'r' && show_all)
die(_("options '%s' and '%s' cannot be used together"),
"--independent", "--all");
if (cmdmode == 'o')
return handle_octopus(argc, argv, show_all);
if (cmdmode == 'r')
return handle_independent(argc, argv);
if (cmdmode == 'f') {
if (argc < 1 || 2 < argc)
usage_with_options(merge_base_usage, options);
return handle_fork_point(argc, argv);
}
if (argc < 2)
usage_with_options(merge_base_usage, options);
ALLOC_ARRAY(rev, argc);
while (argc-- > 0)
rev[rev_nr++] = get_commit_reference(*argv++);
ret = show_merge_base(rev, rev_nr, show_all);
free(rev);
return ret;
}
|
