Merge branch 'bc/signed-objects-with-both-hashes'
[git] / ls-refs.c
1 #include "cache.h"
2 #include "repository.h"
3 #include "refs.h"
4 #include "remote.h"
5 #include "strvec.h"
6 #include "ls-refs.h"
7 #include "pkt-line.h"
8 #include "config.h"
9
10 static int config_read;
11 static int advertise_unborn;
12 static int allow_unborn;
13
14 static 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 {
37                         die(_("invalid value '%s' for lsrefs.unborn"), str);
38                 }
39         }
40         config_read = 1;
41 }
42
43 /*
44  * Check if one of the prefixes is a prefix of the ref.
45  * If no prefixes were provided, all refs match.
46  */
47 static int ref_match(const struct strvec *prefixes, const char *refname)
48 {
49         int i;
50
51         if (!prefixes->nr)
52                 return 1; /* no restriction */
53
54         for (i = 0; i < prefixes->nr; i++) {
55                 const char *prefix = prefixes->v[i];
56
57                 if (starts_with(refname, prefix))
58                         return 1;
59         }
60
61         return 0;
62 }
63
64 struct ls_refs_data {
65         unsigned peel;
66         unsigned symrefs;
67         struct strvec prefixes;
68         unsigned unborn : 1;
69 };
70
71 static int send_ref(const char *refname, const struct object_id *oid,
72                     int flag, void *cb_data)
73 {
74         struct ls_refs_data *data = cb_data;
75         const char *refname_nons = strip_namespace(refname);
76         struct strbuf refline = STRBUF_INIT;
77
78         if (ref_is_hidden(refname_nons, refname))
79                 return 0;
80
81         if (!ref_match(&data->prefixes, refname_nons))
82                 return 0;
83
84         if (oid)
85                 strbuf_addf(&refline, "%s %s", oid_to_hex(oid), refname_nons);
86         else
87                 strbuf_addf(&refline, "unborn %s", refname_nons);
88         if (data->symrefs && flag & REF_ISSYMREF) {
89                 struct object_id unused;
90                 const char *symref_target = resolve_ref_unsafe(refname, 0,
91                                                                &unused,
92                                                                &flag);
93
94                 if (!symref_target)
95                         die("'%s' is a symref but it is not?", refname);
96
97                 strbuf_addf(&refline, " symref-target:%s",
98                             strip_namespace(symref_target));
99         }
100
101         if (data->peel && oid) {
102                 struct object_id peeled;
103                 if (!peel_iterated_oid(oid, &peeled))
104                         strbuf_addf(&refline, " peeled:%s", oid_to_hex(&peeled));
105         }
106
107         strbuf_addch(&refline, '\n');
108         packet_write(1, refline.buf, refline.len);
109
110         strbuf_release(&refline);
111         return 0;
112 }
113
114 static void send_possibly_unborn_head(struct ls_refs_data *data)
115 {
116         struct strbuf namespaced = STRBUF_INIT;
117         struct object_id oid;
118         int flag;
119         int oid_is_null;
120
121         strbuf_addf(&namespaced, "%sHEAD", get_git_namespace());
122         if (!resolve_ref_unsafe(namespaced.buf, 0, &oid, &flag))
123                 return; /* bad ref */
124         oid_is_null = is_null_oid(&oid);
125         if (!oid_is_null ||
126             (data->unborn && data->symrefs && (flag & REF_ISSYMREF)))
127                 send_ref(namespaced.buf, oid_is_null ? NULL : &oid, flag, data);
128         strbuf_release(&namespaced);
129 }
130
131 static int ls_refs_config(const char *var, const char *value, void *data)
132 {
133         /*
134          * We only serve fetches over v2 for now, so respect only "uploadpack"
135          * config. This may need to eventually be expanded to "receive", but we
136          * don't yet know how that information will be passed to ls-refs.
137          */
138         return parse_hide_refs_config(var, value, "uploadpack");
139 }
140
141 int ls_refs(struct repository *r, struct strvec *keys,
142             struct packet_reader *request)
143 {
144         struct ls_refs_data data;
145
146         memset(&data, 0, sizeof(data));
147         strvec_init(&data.prefixes);
148
149         ensure_config_read();
150         git_config(ls_refs_config, NULL);
151
152         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
153                 const char *arg = request->line;
154                 const char *out;
155
156                 if (!strcmp("peel", arg))
157                         data.peel = 1;
158                 else if (!strcmp("symrefs", arg))
159                         data.symrefs = 1;
160                 else if (skip_prefix(arg, "ref-prefix ", &out))
161                         strvec_push(&data.prefixes, out);
162                 else if (!strcmp("unborn", arg))
163                         data.unborn = allow_unborn;
164         }
165
166         if (request->status != PACKET_READ_FLUSH)
167                 die(_("expected flush after ls-refs arguments"));
168
169         send_possibly_unborn_head(&data);
170         if (!data.prefixes.nr)
171                 strvec_push(&data.prefixes, "");
172         for_each_fullref_in_prefixes(get_git_namespace(), data.prefixes.v,
173                                      send_ref, &data, 0);
174         packet_flush(1);
175         strvec_clear(&data.prefixes);
176         return 0;
177 }
178
179 int ls_refs_advertise(struct repository *r, struct strbuf *value)
180 {
181         if (value) {
182                 ensure_config_read();
183                 if (advertise_unborn)
184                         strbuf_addstr(value, "unborn");
185         }
186
187         return 1;
188 }