]> git.ipfire.org Git - thirdparty/git.git/blame - ls-refs.c
Merge branch 'jk/clone-allow-bare-and-o-together'
[thirdparty/git.git] / ls-refs.c
CommitLineData
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1#include "cache.h"
2#include "repository.h"
3#include "refs.h"
4#include "remote.h"
dbbcd44f 5#include "strvec.h"
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6#include "ls-refs.h"
7#include "pkt-line.h"
e20b4192 8#include "config.h"
72d0ea00 9
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10static int config_read;
11static int advertise_unborn;
12static int allow_unborn;
13
14static void ensure_config_read(void)
15{
16 const char *str = NULL;
17
18 if (config_read)
19 return;
20
21 if (repo_config_get_string_tmp(the_repository, "lsrefs.unborn", &str)) {
22 /*
23 * If there is no such config, advertise and allow it by
24 * default.
25 */
26 advertise_unborn = 1;
27 allow_unborn = 1;
28 } else {
29 if (!strcmp(str, "advertise")) {
30 advertise_unborn = 1;
31 allow_unborn = 1;
32 } else if (!strcmp(str, "allow")) {
33 allow_unborn = 1;
34 } else if (!strcmp(str, "ignore")) {
35 /* do nothing */
36 } else {
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37 die(_("invalid value for '%s': '%s'"),
38 "lsrefs.unborn", str);
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39 }
40 }
41 config_read = 1;
42}
43
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44/*
45 * If we see this many or more "ref-prefix" lines from the client, we consider
46 * it "too many" and will avoid using the prefix feature entirely.
47 */
48#define TOO_MANY_PREFIXES 65536
49
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50/*
51 * Check if one of the prefixes is a prefix of the ref.
52 * If no prefixes were provided, all refs match.
53 */
ef8d7ac4 54static int ref_match(const struct strvec *prefixes, const char *refname)
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55{
56 int i;
57
d70a9eb6 58 if (!prefixes->nr)
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59 return 1; /* no restriction */
60
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61 for (i = 0; i < prefixes->nr; i++) {
62 const char *prefix = prefixes->v[i];
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63
64 if (starts_with(refname, prefix))
65 return 1;
66 }
67
68 return 0;
69}
70
71struct ls_refs_data {
72 unsigned peel;
73 unsigned symrefs;
ef8d7ac4 74 struct strvec prefixes;
f54b9f21 75 struct strbuf buf;
59e1205d 76 unsigned unborn : 1;
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77};
78
79static int send_ref(const char *refname, const struct object_id *oid,
80 int flag, void *cb_data)
81{
82 struct ls_refs_data *data = cb_data;
83 const char *refname_nons = strip_namespace(refname);
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84
85 strbuf_reset(&data->buf);
72d0ea00 86
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87 if (ref_is_hidden(refname_nons, refname))
88 return 0;
89
e2f41a0a 90 if (!ref_match(&data->prefixes, refname_nons))
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91 return 0;
92
59e1205d 93 if (oid)
f54b9f21 94 strbuf_addf(&data->buf, "%s %s", oid_to_hex(oid), refname_nons);
59e1205d 95 else
f54b9f21 96 strbuf_addf(&data->buf, "unborn %s", refname_nons);
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97 if (data->symrefs && flag & REF_ISSYMREF) {
98 struct object_id unused;
99 const char *symref_target = resolve_ref_unsafe(refname, 0,
100 &unused,
101 &flag);
102
103 if (!symref_target)
104 die("'%s' is a symref but it is not?", refname);
105
f54b9f21 106 strbuf_addf(&data->buf, " symref-target:%s",
533e0882 107 strip_namespace(symref_target));
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108 }
109
59e1205d 110 if (data->peel && oid) {
72d0ea00 111 struct object_id peeled;
36a31792 112 if (!peel_iterated_oid(oid, &peeled))
f54b9f21 113 strbuf_addf(&data->buf, " peeled:%s", oid_to_hex(&peeled));
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114 }
115
f54b9f21 116 strbuf_addch(&data->buf, '\n');
c2509c54 117 packet_fwrite(stdout, data->buf.buf, data->buf.len);
72d0ea00 118
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119 return 0;
120}
121
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122static void send_possibly_unborn_head(struct ls_refs_data *data)
123{
124 struct strbuf namespaced = STRBUF_INIT;
125 struct object_id oid;
126 int flag;
127 int oid_is_null;
128
129 strbuf_addf(&namespaced, "%sHEAD", get_git_namespace());
130 if (!resolve_ref_unsafe(namespaced.buf, 0, &oid, &flag))
131 return; /* bad ref */
132 oid_is_null = is_null_oid(&oid);
133 if (!oid_is_null ||
134 (data->unborn && data->symrefs && (flag & REF_ISSYMREF)))
135 send_ref(namespaced.buf, oid_is_null ? NULL : &oid, flag, data);
136 strbuf_release(&namespaced);
137}
138
783a86c1 139static int ls_refs_config(const char *var, const char *value,
5cf88fd8 140 void *data UNUSED)
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141{
142 /*
143 * We only serve fetches over v2 for now, so respect only "uploadpack"
144 * config. This may need to eventually be expanded to "receive", but we
145 * don't yet know how that information will be passed to ls-refs.
146 */
147 return parse_hide_refs_config(var, value, "uploadpack");
148}
149
28a592e4 150int ls_refs(struct repository *r, struct packet_reader *request)
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151{
152 struct ls_refs_data data;
153
154 memset(&data, 0, sizeof(data));
83befd37 155 strvec_init(&data.prefixes);
f54b9f21 156 strbuf_init(&data.buf, 0);
72d0ea00 157
59e1205d 158 ensure_config_read();
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159 git_config(ls_refs_config, NULL);
160
4845b772 161 while (packet_reader_read(request) == PACKET_READ_NORMAL) {
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162 const char *arg = request->line;
163 const char *out;
164
165 if (!strcmp("peel", arg))
166 data.peel = 1;
167 else if (!strcmp("symrefs", arg))
168 data.symrefs = 1;
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169 else if (skip_prefix(arg, "ref-prefix ", &out)) {
170 if (data.prefixes.nr < TOO_MANY_PREFIXES)
171 strvec_push(&data.prefixes, out);
172 }
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173 else if (!strcmp("unborn", arg))
174 data.unborn = allow_unborn;
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175 else
176 die(_("unexpected line: '%s'"), arg);
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177 }
178
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179 if (request->status != PACKET_READ_FLUSH)
180 die(_("expected flush after ls-refs arguments"));
181
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182 /*
183 * If we saw too many prefixes, we must avoid using them at all; as
184 * soon as we have any prefix, they are meant to form a comprehensive
185 * list.
186 */
187 if (data.prefixes.nr >= TOO_MANY_PREFIXES)
188 strvec_clear(&data.prefixes);
189
59e1205d 190 send_possibly_unborn_head(&data);
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191 if (!data.prefixes.nr)
192 strvec_push(&data.prefixes, "");
193 for_each_fullref_in_prefixes(get_git_namespace(), data.prefixes.v,
67985e4e 194 send_ref, &data);
70afef5c 195 packet_fflush(stdout);
ef8d7ac4 196 strvec_clear(&data.prefixes);
f54b9f21 197 strbuf_release(&data.buf);
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198 return 0;
199}
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200
201int ls_refs_advertise(struct repository *r, struct strbuf *value)
202{
203 if (value) {
204 ensure_config_read();
205 if (advertise_unborn)
206 strbuf_addstr(value, "unborn");
207 }
208
209 return 1;
210}