promisor-remote.c

   1 #include "git-compat-util.h"
   2 #include "gettext.h"
   3 #include "hex.h"
   4 #include "object-store.h"
   5 #include "promisor-remote.h"
   6 #include "config.h"
   7 #include "trace2.h"
   8 #include "transport.h"
   9 #include "strvec.h"
  10 #include "packfile.h"
  11
  12 struct promisor_remote_config {
  13         struct promisor_remote *promisors;
  14         struct promisor_remote **promisors_tail;
  15 };
  16
  17 static int fetch_objects(struct repository *repo,
  18                          const char *remote_name,
  19                          const struct object_id *oids,
  20                          int oid_nr)
  21 {
  22         struct child_process child = CHILD_PROCESS_INIT;
  23         int i;
  24         FILE *child_in;
  25
  26         child.git_cmd = 1;
  27         child.in = -1;
  28         if (repo != the_repository)
  29                 prepare_other_repo_env(&child.env, repo->gitdir);
  30         strvec_pushl(&child.args, "-c", "fetch.negotiationAlgorithm=noop",
  31                      "fetch", remote_name, "--no-tags",
  32                      "--no-write-fetch-head", "--recurse-submodules=no",
  33                      "--filter=blob:none", "--stdin", NULL);
  34         if (start_command(&child))
  35                 die(_("promisor-remote: unable to fork off fetch subprocess"));
  36         child_in = xfdopen(child.in, "w");
  37
  38         trace2_data_intmax("promisor", repo, "fetch_count", oid_nr);
  39
  40         for (i = 0; i < oid_nr; i++) {
  41                 if (fputs(oid_to_hex(&oids[i]), child_in) < 0)
  42                         die_errno(_("promisor-remote: could not write to fetch subprocess"));
  43                 if (fputc('\n', child_in) < 0)
  44                         die_errno(_("promisor-remote: could not write to fetch subprocess"));
  45         }
  46
  47         if (fclose(child_in) < 0)
  48                 die_errno(_("promisor-remote: could not close stdin to fetch subprocess"));
  49         return finish_command(&child) ? -1 : 0;
  50 }
  51
  52 static struct promisor_remote *promisor_remote_new(struct promisor_remote_config *config,
  53                                                    const char *remote_name)
  54 {
  55         struct promisor_remote *r;
  56
  57         if (*remote_name == '/') {
  58                 warning(_("promisor remote name cannot begin with '/': %s"),
  59                         remote_name);
  60                 return NULL;
  61         }
  62
  63         FLEX_ALLOC_STR(r, name, remote_name);
  64
  65         *config->promisors_tail = r;
  66         config->promisors_tail = &r->next;
  67
  68         return r;
  69 }
  70
  71 static struct promisor_remote *promisor_remote_lookup(struct promisor_remote_config *config,
  72                                                       const char *remote_name,
  73                                                       struct promisor_remote **previous)
  74 {
  75         struct promisor_remote *r, *p;
  76
  77         for (p = NULL, r = config->promisors; r; p = r, r = r->next)
  78                 if (!strcmp(r->name, remote_name)) {
  79                         if (previous)
  80                                 *previous = p;
  81                         return r;
  82                 }
  83
  84         return NULL;
  85 }
  86
  87 static void promisor_remote_move_to_tail(struct promisor_remote_config *config,
  88                                          struct promisor_remote *r,
  89                                          struct promisor_remote *previous)
  90 {
  91         if (!r->next)
  92                 return;
  93
  94         if (previous)
  95                 previous->next = r->next;
  96         else
  97                 config->promisors = r->next ? r->next : r;
  98         r->next = NULL;
  99         *config->promisors_tail = r;
 100         config->promisors_tail = &r->next;
 101 }
 102
 103 static int promisor_remote_config(const char *var, const char *value, void *data)
 104 {
 105         struct promisor_remote_config *config = data;
 106         const char *name;
 107         size_t namelen;
 108         const char *subkey;
 109
 110         if (parse_config_key(var, "remote", &name, &namelen, &subkey) < 0)
 111                 return 0;
 112
 113         if (!strcmp(subkey, "promisor")) {
 114                 char *remote_name;
 115
 116                 if (!git_config_bool(var, value))
 117                         return 0;
 118
 119                 remote_name = xmemdupz(name, namelen);
 120
 121                 if (!promisor_remote_lookup(config, remote_name, NULL))
 122                         promisor_remote_new(config, remote_name);
 123
 124                 free(remote_name);
 125                 return 0;
 126         }
 127         if (!strcmp(subkey, "partialclonefilter")) {
 128                 struct promisor_remote *r;
 129                 char *remote_name = xmemdupz(name, namelen);
 130
 131                 r = promisor_remote_lookup(config, remote_name, NULL);
 132                 if (!r)
 133                         r = promisor_remote_new(config, remote_name);
 134
 135                 free(remote_name);
 136
 137                 if (!r)
 138                         return 0;
 139
 140                 return git_config_string(&r->partial_clone_filter, var, value);
 141         }
 142
 143         return 0;
 144 }
 145
 146 static void promisor_remote_init(struct repository *r)
 147 {
 148         struct promisor_remote_config *config;
 149
 150         if (r->promisor_remote_config)
 151                 return;
 152         config = r->promisor_remote_config =
 153                 xcalloc(1, sizeof(*r->promisor_remote_config));
 154         config->promisors_tail = &config->promisors;
 155
 156         repo_config(r, promisor_remote_config, config);
 157
 158         if (r->repository_format_partial_clone) {
 159                 struct promisor_remote *o, *previous;
 160
 161                 o = promisor_remote_lookup(config,
 162                                            r->repository_format_partial_clone,
 163                                            &previous);
 164                 if (o)
 165                         promisor_remote_move_to_tail(config, o, previous);
 166                 else
 167                         promisor_remote_new(config, r->repository_format_partial_clone);
 168         }
 169 }
 170
 171 void promisor_remote_clear(struct promisor_remote_config *config)
 172 {
 173         while (config->promisors) {
 174                 struct promisor_remote *r = config->promisors;
 175                 config->promisors = config->promisors->next;
 176                 free(r);
 177         }
 178
 179         config->promisors_tail = &config->promisors;
 180 }
 181
 182 void repo_promisor_remote_reinit(struct repository *r)
 183 {
 184         promisor_remote_clear(r->promisor_remote_config);
 185         FREE_AND_NULL(r->promisor_remote_config);
 186         promisor_remote_init(r);
 187 }
 188
 189 struct promisor_remote *repo_promisor_remote_find(struct repository *r,
 190                                                   const char *remote_name)
 191 {
 192         promisor_remote_init(r);
 193
 194         if (!remote_name)
 195                 return r->promisor_remote_config->promisors;
 196
 197         return promisor_remote_lookup(r->promisor_remote_config, remote_name, NULL);
 198 }
 199
 200 int repo_has_promisor_remote(struct repository *r)
 201 {
 202         return !!repo_promisor_remote_find(r, NULL);
 203 }
 204
 205 static int remove_fetched_oids(struct repository *repo,
 206                                struct object_id **oids,
 207                                int oid_nr, int to_free)
 208 {
 209         int i, remaining_nr = 0;
 210         int *remaining = xcalloc(oid_nr, sizeof(*remaining));
 211         struct object_id *old_oids = *oids;
 212         struct object_id *new_oids;
 213
 214         for (i = 0; i < oid_nr; i++)
 215                 if (oid_object_info_extended(repo, &old_oids[i], NULL,
 216                                              OBJECT_INFO_SKIP_FETCH_OBJECT)) {
 217                         remaining[i] = 1;
 218                         remaining_nr++;
 219                 }
 220
 221         if (remaining_nr) {
 222                 int j = 0;
 223                 CALLOC_ARRAY(new_oids, remaining_nr);
 224                 for (i = 0; i < oid_nr; i++)
 225                         if (remaining[i])
 226                                 oidcpy(&new_oids[j++], &old_oids[i]);
 227                 *oids = new_oids;
 228                 if (to_free)
 229                         free(old_oids);
 230         }
 231
 232         free(remaining);
 233
 234         return remaining_nr;
 235 }
 236
 237 void promisor_remote_get_direct(struct repository *repo,
 238                                 const struct object_id *oids,
 239                                 int oid_nr)
 240 {
 241         struct promisor_remote *r;
 242         struct object_id *remaining_oids = (struct object_id *)oids;
 243         int remaining_nr = oid_nr;
 244         int to_free = 0;
 245         int i;
 246
 247         if (oid_nr == 0)
 248                 return;
 249
 250         promisor_remote_init(repo);
 251
 252         for (r = repo->promisor_remote_config->promisors; r; r = r->next) {
 253                 if (fetch_objects(repo, r->name, remaining_oids, remaining_nr) < 0) {
 254                         if (remaining_nr == 1)
 255                                 continue;
 256                         remaining_nr = remove_fetched_oids(repo, &remaining_oids,
 257                                                          remaining_nr, to_free);
 258                         if (remaining_nr) {
 259                                 to_free = 1;
 260                                 continue;
 261                         }
 262                 }
 263                 goto all_fetched;
 264         }
 265
 266         for (i = 0; i < remaining_nr; i++) {
 267                 if (is_promisor_object(&remaining_oids[i]))
 268                         die(_("could not fetch %s from promisor remote"),
 269                             oid_to_hex(&remaining_oids[i]));
 270         }
 271
 272 all_fetched:
 273         if (to_free)
 274                 free(remaining_oids);
 275 }