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 /*
  11  * Check if one of the prefixes is a prefix of the ref.
  12  * If no prefixes were provided, all refs match.
  13  */
  14 static int ref_match(const struct strvec *prefixes, const char *refname)
  15 {
  16         int i;
  17
  18         if (!prefixes->nr)
  19                 return 1; /* no restriction */
  20
  21         for (i = 0; i < prefixes->nr; i++) {
  22                 const char *prefix = prefixes->v[i];
  23
  24                 if (starts_with(refname, prefix))
  25                         return 1;
  26         }
  27
  28         return 0;
  29 }
  30
  31 struct ls_refs_data {
  32         unsigned peel;
  33         unsigned symrefs;
  34         struct strvec prefixes;
  35 };
  36
  37 static int send_ref(const char *refname, const struct object_id *oid,
  38                     int flag, void *cb_data)
  39 {
  40         struct ls_refs_data *data = cb_data;
  41         const char *refname_nons = strip_namespace(refname);
  42         struct strbuf refline = STRBUF_INIT;
  43
  44         if (ref_is_hidden(refname_nons, refname))
  45                 return 0;
  46
  47         if (!ref_match(&data->prefixes, refname_nons))
  48                 return 0;
  49
  50         strbuf_addf(&refline, "%s %s", oid_to_hex(oid), refname_nons);
  51         if (data->symrefs && flag & REF_ISSYMREF) {
  52                 struct object_id unused;
  53                 const char *symref_target = resolve_ref_unsafe(refname, 0,
  54                                                                &unused,
  55                                                                &flag);
  56
  57                 if (!symref_target)
  58                         die("'%s' is a symref but it is not?", refname);
  59
  60                 strbuf_addf(&refline, " symref-target:%s",
  61                             strip_namespace(symref_target));
  62         }
  63
  64         if (data->peel) {
  65                 struct object_id peeled;
  66                 if (!peel_ref(refname, &peeled))
  67                         strbuf_addf(&refline, " peeled:%s", oid_to_hex(&peeled));
  68         }
  69
  70         strbuf_addch(&refline, '\n');
  71         packet_write(1, refline.buf, refline.len);
  72
  73         strbuf_release(&refline);
  74         return 0;
  75 }
  76
  77 static int ls_refs_config(const char *var, const char *value, void *data)
  78 {
  79         /*
  80          * We only serve fetches over v2 for now, so respect only "uploadpack"
  81          * config. This may need to eventually be expanded to "receive", but we
  82          * don't yet know how that information will be passed to ls-refs.
  83          */
  84         return parse_hide_refs_config(var, value, "uploadpack");
  85 }
  86
  87 int ls_refs(struct repository *r, struct strvec *keys,
  88             struct packet_reader *request)
  89 {
  90         struct ls_refs_data data;
  91
  92         memset(&data, 0, sizeof(data));
  93
  94         git_config(ls_refs_config, NULL);
  95
  96         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
  97                 const char *arg = request->line;
  98                 const char *out;
  99
 100                 if (!strcmp("peel", arg))
 101                         data.peel = 1;
 102                 else if (!strcmp("symrefs", arg))
 103                         data.symrefs = 1;
 104                 else if (skip_prefix(arg, "ref-prefix ", &out))
 105                         strvec_push(&data.prefixes, out);
 106         }
 107
 108         if (request->status != PACKET_READ_FLUSH)
 109                 die(_("expected flush after ls-refs arguments"));
 110
 111         head_ref_namespaced(send_ref, &data);
 112         for_each_namespaced_ref(send_ref, &data);
 113         packet_flush(1);
 114         strvec_clear(&data.prefixes);
 115         return 0;
 116 }