about summary refs log tree commit diff
path: root/refspec.c
blob: 9a9bf21934afb74e34b8cef1042860824f4c7282 (plain) (blame)
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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
#include "cache.h"
#include "argv-array.h"
#include "refs.h"
#include "refspec.h"

static struct refspec_item s_tag_refspec = {
	0,
	1,
	0,
	0,
	"refs/tags/*",
	"refs/tags/*"
};

/* See TAG_REFSPEC for the string version */
const struct refspec_item *tag_refspec = &s_tag_refspec;

/*
 * Parses the provided refspec 'refspec' and populates the refspec_item 'item'.
 * Returns 1 if successful and 0 if the refspec is invalid.
 */
static int parse_refspec(struct refspec_item *item, const char *refspec, int fetch)
{
	size_t llen;
	int is_glob;
	const char *lhs, *rhs;
	int flags;

	is_glob = 0;

	lhs = refspec;
	if (*lhs == '+') {
		item->force = 1;
		lhs++;
	}

	rhs = strrchr(lhs, ':');

	/*
	 * Before going on, special case ":" (or "+:") as a refspec
	 * for pushing matching refs.
	 */
	if (!fetch && rhs == lhs && rhs[1] == '\0') {
		item->matching = 1;
		return 1;
	}

	if (rhs) {
		size_t rlen = strlen(++rhs);
		is_glob = (1 <= rlen && strchr(rhs, '*'));
		item->dst = xstrndup(rhs, rlen);
	} else {
		item->dst = NULL;
	}

	llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
	if (1 <= llen && memchr(lhs, '*', llen)) {
		if ((rhs && !is_glob) || (!rhs && fetch))
			return 0;
		is_glob = 1;
	} else if (rhs && is_glob) {
		return 0;
	}

	item->pattern = is_glob;
	item->src = xstrndup(lhs, llen);
	flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);

	if (fetch) {
		struct object_id unused;

		/* LHS */
		if (!*item->src)
			; /* empty is ok; it means "HEAD" */
		else if (llen == the_hash_algo->hexsz && !get_oid_hex(item->src, &unused))
			item->exact_sha1 = 1; /* ok */
		else if (!check_refname_format(item->src, flags))
			; /* valid looking ref is ok */
		else
			return 0;
		/* RHS */
		if (!item->dst)
			; /* missing is ok; it is the same as empty */
		else if (!*item->dst)
			; /* empty is ok; it means "do not store" */
		else if (!check_refname_format(item->dst, flags))
			; /* valid looking ref is ok */
		else
			return 0;
	} else {
		/*
		 * LHS
		 * - empty is allowed; it means delete.
		 * - when wildcarded, it must be a valid looking ref.
		 * - otherwise, it must be an extended SHA-1, but
		 *   there is no existing way to validate this.
		 */
		if (!*item->src)
			; /* empty is ok */
		else if (is_glob) {
			if (check_refname_format(item->src, flags))
				return 0;
		}
		else
			; /* anything goes, for now */
		/*
		 * RHS
		 * - missing is allowed, but LHS then must be a
		 *   valid looking ref.
		 * - empty is not allowed.
		 * - otherwise it must be a valid looking ref.
		 */
		if (!item->dst) {
			if (check_refname_format(item->src, flags))
				return 0;
		} else if (!*item->dst) {
			return 0;
		} else {
			if (check_refname_format(item->dst, flags))
				return 0;
		}
	}

	return 1;
}

int refspec_item_init(struct refspec_item *item, const char *refspec, int fetch)
{
	memset(item, 0, sizeof(*item));
	return parse_refspec(item, refspec, fetch);
}

void refspec_item_init_or_die(struct refspec_item *item, const char *refspec,
			      int fetch)
{
	if (!refspec_item_init(item, refspec, fetch))
		die(_("invalid refspec '%s'"), refspec);
}

void refspec_item_clear(struct refspec_item *item)
{
	FREE_AND_NULL(item->src);
	FREE_AND_NULL(item->dst);
	item->force = 0;
	item->pattern = 0;
	item->matching = 0;
	item->exact_sha1 = 0;
}

void refspec_init(struct refspec *rs, int fetch)
{
	memset(rs, 0, sizeof(*rs));
	rs->fetch = fetch;
}

void refspec_append(struct refspec *rs, const char *refspec)
{
	struct refspec_item item;

	refspec_item_init_or_die(&item, refspec, rs->fetch);

	ALLOC_GROW(rs->items, rs->nr + 1, rs->alloc);
	rs->items[rs->nr++] = item;

	ALLOC_GROW(rs->raw, rs->raw_nr + 1, rs->raw_alloc);
	rs->raw[rs->raw_nr++] = xstrdup(refspec);
}

void refspec_appendn(struct refspec *rs, const char **refspecs, int nr)
{
	int i;
	for (i = 0; i < nr; i++)
		refspec_append(rs, refspecs[i]);
}

void refspec_clear(struct refspec *rs)
{
	int i;

	for (i = 0; i < rs->nr; i++)
		refspec_item_clear(&rs->items[i]);

	FREE_AND_NULL(rs->items);
	rs->alloc = 0;
	rs->nr = 0;

	for (i = 0; i < rs->raw_nr; i++)
		free((char *)rs->raw[i]);
	FREE_AND_NULL(rs->raw);
	rs->raw_alloc = 0;
	rs->raw_nr = 0;

	rs->fetch = 0;
}

int valid_fetch_refspec(const char *fetch_refspec_str)
{
	struct refspec_item refspec;
	int ret = refspec_item_init(&refspec, fetch_refspec_str, REFSPEC_FETCH);
	refspec_item_clear(&refspec);
	return ret;
}

void refspec_ref_prefixes(const struct refspec *rs,
			  struct argv_array *ref_prefixes)
{
	int i;
	for (i = 0; i < rs->nr; i++) {
		const struct refspec_item *item = &rs->items[i];
		const char *prefix = NULL;

		if (item->exact_sha1)
			continue;
		if (rs->fetch == REFSPEC_FETCH)
			prefix = item->src;
		else if (item->dst)
			prefix = item->dst;
		else if (item->src && !item->exact_sha1)
			prefix = item->src;

		if (prefix) {
			if (item->pattern) {
				const char *glob = strchr(prefix, '*');
				argv_array_pushf(ref_prefixes, "%.*s",
						 (int)(glob - prefix),
						 prefix);
			} else {
				expand_ref_prefix(ref_prefixes, prefix);
			}
		}
	}
}