aboutsummaryrefslogtreecommitdiff
path: root/builtin-commit-tree.c
blob: 856f3cd841818bdad4446b3f7b75d5ab22959788 (plain)
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
/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 */
#include "cache.h"
#include "commit.h"
#include "tree.h"
#include "builtin.h"

#define BLOCKING (1ul << 14)

/*
 * FIXME! Share the code with "write-tree.c"
 */
static void init_buffer(char **bufp, unsigned int *sizep)
{
	char *buf = xmalloc(BLOCKING);
	*sizep = 0;
	*bufp = buf;
}

static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)
{
	char one_line[2048];
	va_list args;
	int len;
	unsigned long alloc, size, newsize;
	char *buf;

	va_start(args, fmt);
	len = vsnprintf(one_line, sizeof(one_line), fmt, args);
	va_end(args);
	size = *sizep;
	newsize = size + len;
	alloc = (size + 32767) & ~32767;
	buf = *bufp;
	if (newsize > alloc) {
		alloc = (newsize + 32767) & ~32767;
		buf = xrealloc(buf, alloc);
		*bufp = buf;
	}
	*sizep = newsize;
	memcpy(buf + size, one_line, len);
}

static void check_valid(unsigned char *sha1, const char *expect)
{
	char type[20];

	if (sha1_object_info(sha1, type, NULL))
		die("%s is not a valid object", sha1_to_hex(sha1));
	if (expect && strcmp(type, expect))
		die("%s is not a valid '%s' object", sha1_to_hex(sha1),
		    expect);
}

/*
 * Having more than two parents is not strange at all, and this is
 * how multi-way merges are represented.
 */
#define MAXPARENT (16)
static unsigned char parent_sha1[MAXPARENT][20];

static const char commit_tree_usage[] = "git-commit-tree <sha1> [-p <sha1>]* < changelog";

static int new_parent(int idx)
{
	int i;
	unsigned char *sha1 = parent_sha1[idx];
	for (i = 0; i < idx; i++) {
		if (!hashcmp(parent_sha1[i], sha1)) {
			error("duplicate parent %s ignored", sha1_to_hex(sha1));
			return 0;
		}
	}
	return 1;
}

int cmd_commit_tree(int argc, const char **argv, const char *prefix)
{
	int i;
	int parents = 0;
	unsigned char tree_sha1[20];
	unsigned char commit_sha1[20];
	char comment[1000];
	char *buffer;
	unsigned int size;

	setup_ident();
	git_config(git_default_config);

	if (argc < 2)
		usage(commit_tree_usage);
	if (get_sha1(argv[1], tree_sha1))
		die("Not a valid object name %s", argv[1]);

	check_valid(tree_sha1, tree_type);
	for (i = 2; i < argc; i += 2) {
		const char *a, *b;
		a = argv[i]; b = argv[i+1];
		if (!b || strcmp(a, "-p"))
			usage(commit_tree_usage);
		if (get_sha1(b, parent_sha1[parents]))
			die("Not a valid object name %s", b);
		check_valid(parent_sha1[parents], commit_type);
		if (new_parent(parents))
			parents++;
	}

	init_buffer(&buffer, &size);
	add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));

	/*
	 * NOTE! This ordering means that the same exact tree merged with a
	 * different order of parents will be a _different_ changeset even
	 * if everything else stays the same.
	 */
	for (i = 0; i < parents; i++)
		add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));

	/* Person/date information */
	add_buffer(&buffer, &size, "author %s\n", git_author_info(1));
	add_buffer(&buffer, &size, "committer %s\n\n", git_committer_info(1));

	/* And add the comment */
	while (fgets(comment, sizeof(comment), stdin) != NULL)
		add_buffer(&buffer, &size, "%s", comment);

	if (!write_sha1_file(buffer, size, commit_type, commit_sha1)) {
		printf("%s\n", sha1_to_hex(commit_sha1));
		return 0;
	}
	else
		return 1;
}