summaryrefslogtreecommitdiff
path: root/builtin/mktree.c
blob: de9b40fc63b0a4f76401a111aba806c64ce36ee9 (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
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
/*
 * GIT - the stupid content tracker
 *
 * Copyright (c) Junio C Hamano, 2006, 2009
 */
#include "builtin.h"
#include "quote.h"
#include "tree.h"
#include "parse-options.h"
 
static struct treeent {
	unsigned mode;
	unsigned char sha1[20];
	int len;
	char name[FLEX_ARRAY];
} **entries;
static int alloc, used;
 
static void append_to_tree(unsigned mode, unsigned char *sha1, char *path)
{
	struct treeent *ent;
	size_t len = strlen(path);
	if (strchr(path, '/'))
		die("path %s contains slash", path);
 
	FLEX_ALLOC_MEM(ent, name, path, len);
	ent->mode = mode;
	ent->len = len;
	hashcpy(ent->sha1, sha1);
 
	ALLOC_GROW(entries, used + 1, alloc);
	entries[used++] = ent;
}
 
static int ent_compare(const void *a_, const void *b_)
{
	struct treeent *a = *(struct treeent **)a_;
	struct treeent *b = *(struct treeent **)b_;
	return base_name_compare(a->name, a->len, a->mode,
				 b->name, b->len, b->mode);
}
 
static void write_tree(unsigned char *sha1)
{
	struct strbuf buf;
	size_t size;
	int i;
 
	QSORT(entries, used, ent_compare);
	for (size = i = 0; i < used; i++)
		size += 32 + entries[i]->len;
 
	strbuf_init(&buf, size);
	for (i = 0; i < used; i++) {
		struct treeent *ent = entries[i];
		strbuf_addf(&buf, "%o %s%c", ent->mode, ent->name, '\0');
		strbuf_add(&buf, ent->sha1, 20);
	}
 
	write_sha1_file(buf.buf, buf.len, tree_type, sha1);
	strbuf_release(&buf);
}
 
static const char *mktree_usage[] = {
	N_("git mktree [-z] [--missing] [--batch]"),
	NULL
};
 
static void mktree_line(char *buf, size_t len, int nul_term_line, int allow_missing)
{
	char *ptr, *ntr;
	unsigned mode;
	enum object_type mode_type; /* object type derived from mode */
	enum object_type obj_type; /* object type derived from sha */
	char *path;
	unsigned char sha1[20];
 
	ptr = buf;
	/*
	 * Read non-recursive ls-tree output format:
	 *     mode SP type SP sha1 TAB name
	 */
	mode = strtoul(ptr, &ntr, 8);
	if (ptr == ntr || !ntr || *ntr != ' ')
		die("input format error: %s", buf);
	ptr = ntr + 1; /* type */
	ntr = strchr(ptr, ' ');
	if (!ntr || buf + len <= ntr + 40 ||
	    ntr[41] != '\t' ||
	    get_sha1_hex(ntr + 1, sha1))
		die("input format error: %s", buf);
 
	/* It is perfectly normal if we do not have a commit from a submodule */
	if (S_ISGITLINK(mode))
		allow_missing = 1;
 
 
	*ntr++ = 0; /* now at the beginning of SHA1 */
 
	path = ntr + 41;  /* at the beginning of name */
	if (!nul_term_line && path[0] == '"') {
		struct strbuf p_uq = STRBUF_INIT;
		if (unquote_c_style(&p_uq, path, NULL))
			die("invalid quoting");
		path = strbuf_detach(&p_uq, NULL);
	}
 
	/*
	 * Object type is redundantly derivable three ways.
	 * These should all agree.
	 */
	mode_type = object_type(mode);
	if (mode_type != type_from_string(ptr)) {
		die("entry '%s' object type (%s) doesn't match mode type (%s)",
			path, ptr, typename(mode_type));
	}
 
	/* Check the type of object identified by sha1 */
	obj_type = sha1_object_info(sha1, NULL);
	if (obj_type < 0) {
		if (allow_missing) {
			; /* no problem - missing objects are presumed to be of the right type */
		} else {
			die("entry '%s' object %s is unavailable", path, sha1_to_hex(sha1));
		}
	} else {
		if (obj_type != mode_type) {
			/*
			 * The object exists but is of the wrong type.
			 * This is a problem regardless of allow_missing
			 * because the new tree entry will never be correct.
			 */
			die("entry '%s' object %s is a %s but specified type was (%s)",
				path, sha1_to_hex(sha1), typename(obj_type), typename(mode_type));
		}
	}
 
	append_to_tree(mode, sha1, path);
}
 
int cmd_mktree(int ac, const char **av, const char *prefix)
{
	struct strbuf sb = STRBUF_INIT;
	unsigned char sha1[20];
	int nul_term_line = 0;
	int allow_missing = 0;
	int is_batch_mode = 0;
	int got_eof = 0;
	strbuf_getline_fn getline_fn;
 
	const struct option option[] = {
		OPT_BOOL('z', NULL, &nul_term_line, N_("input is NUL terminated")),
		OPT_SET_INT( 0 , "missing", &allow_missing, N_("allow missing objects"), 1),
		OPT_SET_INT( 0 , "batch", &is_batch_mode, N_("allow creation of more than one tree"), 1),
		OPT_END()
	};
 
	ac = parse_options(ac, av, prefix, option, mktree_usage, 0);
	getline_fn = nul_term_line ? strbuf_getline_nul : strbuf_getline_lf;
 
	while (!got_eof) {
		while (1) {
			if (getline_fn(&sb, stdin) == EOF) {
				got_eof = 1;
				break;
			}
			if (sb.buf[0] == '\0') {
				/* empty lines denote tree boundaries in batch mode */
				if (is_batch_mode)
					break;
				die("input format error: (blank line only valid in batch mode)");
			}
			mktree_line(sb.buf, sb.len, nul_term_line, allow_missing);
		}
		if (is_batch_mode && got_eof && used < 1) {
			/*
			 * Execution gets here if the last tree entry is terminated with a
			 * new-line.  The final new-line has been made optional to be
			 * consistent with the original non-batch behaviour of mktree.
			 */
			; /* skip creating an empty tree */
		} else {
			write_tree(sha1);
			puts(sha1_to_hex(sha1));
			fflush(stdout);
		}
		used=0; /* reset tree entry buffer for re-use in batch mode */
	}
	strbuf_release(&sb);
	exit(0);
}