Merge branch 'jk/diff-follow-must-take-one-pathspec' into maint
[git] / builtin / merge-recursive.c
1 #include "builtin.h"
2 #include "commit.h"
3 #include "tag.h"
4 #include "merge-recursive.h"
5 #include "xdiff-interface.h"
6
7 static const char builtin_merge_recursive_usage[] =
8         "git %s <base>... -- <head> <remote> ...";
9
10 static const char *better_branch_name(const char *branch)
11 {
12         static char githead_env[8 + 40 + 1];
13         char *name;
14
15         if (strlen(branch) != 40)
16                 return branch;
17         sprintf(githead_env, "GITHEAD_%s", branch);
18         name = getenv(githead_env);
19         return name ? name : branch;
20 }
21
22 int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
23 {
24         const unsigned char *bases[21];
25         unsigned bases_count = 0;
26         int i, failed;
27         unsigned char h1[20], h2[20];
28         struct merge_options o;
29         struct commit *result;
30
31         init_merge_options(&o);
32         if (argv[0] && ends_with(argv[0], "-subtree"))
33                 o.subtree_shift = "";
34
35         if (argc < 4)
36                 usagef(builtin_merge_recursive_usage, argv[0]);
37
38         for (i = 1; i < argc; ++i) {
39                 const char *arg = argv[i];
40
41                 if (starts_with(arg, "--")) {
42                         if (!arg[2])
43                                 break;
44                         if (parse_merge_opt(&o, arg + 2))
45                                 die("Unknown option %s", arg);
46                         continue;
47                 }
48                 if (bases_count < ARRAY_SIZE(bases)-1) {
49                         unsigned char *sha = xmalloc(20);
50                         if (get_sha1(argv[i], sha))
51                                 die("Could not parse object '%s'", argv[i]);
52                         bases[bases_count++] = sha;
53                 }
54                 else
55                         warning("Cannot handle more than %d bases. "
56                                 "Ignoring %s.",
57                                 (int)ARRAY_SIZE(bases)-1, argv[i]);
58         }
59         if (argc - i != 3) /* "--" "<head>" "<remote>" */
60                 die("Not handling anything other than two heads merge.");
61
62         o.branch1 = argv[++i];
63         o.branch2 = argv[++i];
64
65         if (get_sha1(o.branch1, h1))
66                 die("Could not resolve ref '%s'", o.branch1);
67         if (get_sha1(o.branch2, h2))
68                 die("Could not resolve ref '%s'", o.branch2);
69
70         o.branch1 = better_branch_name(o.branch1);
71         o.branch2 = better_branch_name(o.branch2);
72
73         if (o.verbosity >= 3)
74                 printf("Merging %s with %s\n", o.branch1, o.branch2);
75
76         failed = merge_recursive_generic(&o, h1, h2, bases_count, bases, &result);
77         if (failed < 0)
78                 return 128; /* die() error code */
79         return failed;
80 }