promisor-remote.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2
   3 #include "git-compat-util.h"
   4 #include "gettext.h"
   5 #include "hex.h"
   6 #include "object-store-ll.h"
   7 #include "promisor-remote.h"
   8 #include "config.h"
   9 #include "trace2.h"
  10 #include "transport.h"
  11 #include "strvec.h"
  12 #include "packfile.h"
  13 #include "environment.h"
  14
  15 struct promisor_remote_config {
  16         struct promisor_remote *promisors;
  17         struct promisor_remote **promisors_tail;
  18 };
  19
  20 static int fetch_objects(struct repository *repo,
  21                          const char *remote_name,
  22                          const struct object_id *oids,
  23                          int oid_nr)
  24 {
  25         struct child_process child = CHILD_PROCESS_INIT;
  26         int i;
  27         FILE *child_in;
  28         int quiet;
  29
  30         if (git_env_bool(NO_LAZY_FETCH_ENVIRONMENT, 0)) {
  31                 static int warning_shown;
  32                 if (!warning_shown) {
  33                         warning_shown = 1;
  34                         warning(_("lazy fetching disabled; some objects may not be available"));
  35                 }
  36                 return -1;
  37         }
  38
  39         child.git_cmd = 1;
  40         child.in = -1;
  41         if (repo != the_repository)
  42                 prepare_other_repo_env(&child.env, repo->gitdir);
  43         strvec_pushl(&child.args, "-c", "fetch.negotiationAlgorithm=noop",
  44                      "fetch", remote_name, "--no-tags",
  45                      "--no-write-fetch-head", "--recurse-submodules=no",
  46                      "--filter=blob:none", "--stdin", NULL);
  47         if (!git_config_get_bool("promisor.quiet", &quiet) && quiet)
  48                 strvec_push(&child.args, "--quiet");
  49         if (start_command(&child))
  50                 die(_("promisor-remote: unable to fork off fetch subprocess"));
  51         child_in = xfdopen(child.in, "w");
  52
  53         trace2_data_intmax("promisor", repo, "fetch_count", oid_nr);
  54
  55         for (i = 0; i < oid_nr; i++) {
  56                 if (fputs(oid_to_hex(&oids[i]), child_in) < 0)
  57                         die_errno(_("promisor-remote: could not write to fetch subprocess"));
  58                 if (fputc('\n', child_in) < 0)
  59                         die_errno(_("promisor-remote: could not write to fetch subprocess"));
  60         }
  61
  62         if (fclose(child_in) < 0)
  63                 die_errno(_("promisor-remote: could not close stdin to fetch subprocess"));
  64         return finish_command(&child) ? -1 : 0;
  65 }
  66
  67 static struct promisor_remote *promisor_remote_new(struct promisor_remote_config *config,
  68                                                    const char *remote_name)
  69 {
  70         struct promisor_remote *r;
  71
  72         if (*remote_name == '/') {
  73                 warning(_("promisor remote name cannot begin with '/': %s"),
  74                         remote_name);
  75                 return NULL;
  76         }
  77
  78         FLEX_ALLOC_STR(r, name, remote_name);
  79
  80         *config->promisors_tail = r;
  81         config->promisors_tail = &r->next;
  82
  83         return r;
  84 }
  85
  86 static struct promisor_remote *promisor_remote_lookup(struct promisor_remote_config *config,
  87                                                       const char *remote_name,
  88                                                       struct promisor_remote **previous)
  89 {
  90         struct promisor_remote *r, *p;
  91
  92         for (p = NULL, r = config->promisors; r; p = r, r = r->next)
  93                 if (!strcmp(r->name, remote_name)) {
  94                         if (previous)
  95                                 *previous = p;
  96                         return r;
  97                 }
  98
  99         return NULL;
 100 }
 101
 102 static void promisor_remote_move_to_tail(struct promisor_remote_config *config,
 103                                          struct promisor_remote *r,
 104                                          struct promisor_remote *previous)
 105 {
 106         if (!r->next)
 107                 return;
 108
 109         if (previous)
 110                 previous->next = r->next;
 111         else
 112                 config->promisors = r->next ? r->next : r;
 113         r->next = NULL;
 114         *config->promisors_tail = r;
 115         config->promisors_tail = &r->next;
 116 }
 117
 118 static int promisor_remote_config(const char *var, const char *value,
 119                                   const struct config_context *ctx UNUSED,
 120                                   void *data)
 121 {
 122         struct promisor_remote_config *config = data;
 123         const char *name;
 124         size_t namelen;
 125         const char *subkey;
 126
 127         if (parse_config_key(var, "remote", &name, &namelen, &subkey) < 0)
 128                 return 0;
 129
 130         if (!strcmp(subkey, "promisor")) {
 131                 char *remote_name;
 132
 133                 if (!git_config_bool(var, value))
 134                         return 0;
 135
 136                 remote_name = xmemdupz(name, namelen);
 137
 138                 if (!promisor_remote_lookup(config, remote_name, NULL))
 139                         promisor_remote_new(config, remote_name);
 140
 141                 free(remote_name);
 142                 return 0;
 143         }
 144         if (!strcmp(subkey, "partialclonefilter")) {
 145                 struct promisor_remote *r;
 146                 char *remote_name = xmemdupz(name, namelen);
 147
 148                 r = promisor_remote_lookup(config, remote_name, NULL);
 149                 if (!r)
 150                         r = promisor_remote_new(config, remote_name);
 151
 152                 free(remote_name);
 153
 154                 if (!r)
 155                         return 0;
 156
 157                 return git_config_string(&r->partial_clone_filter, var, value);
 158         }
 159
 160         return 0;
 161 }
 162
 163 static void promisor_remote_init(struct repository *r)
 164 {
 165         struct promisor_remote_config *config;
 166
 167         if (r->promisor_remote_config)
 168                 return;
 169         config = r->promisor_remote_config =
 170                 xcalloc(1, sizeof(*r->promisor_remote_config));
 171         config->promisors_tail = &config->promisors;
 172
 173         repo_config(r, promisor_remote_config, config);
 174
 175         if (r->repository_format_partial_clone) {
 176                 struct promisor_remote *o, *previous;
 177
 178                 o = promisor_remote_lookup(config,
 179                                            r->repository_format_partial_clone,
 180                                            &previous);
 181                 if (o)
 182                         promisor_remote_move_to_tail(config, o, previous);
 183                 else
 184                         promisor_remote_new(config, r->repository_format_partial_clone);
 185         }
 186 }
 187
 188 void promisor_remote_clear(struct promisor_remote_config *config)
 189 {
 190         while (config->promisors) {
 191                 struct promisor_remote *r = config->promisors;
 192                 config->promisors = config->promisors->next;
 193                 free(r);
 194         }
 195
 196         config->promisors_tail = &config->promisors;
 197 }
 198
 199 void repo_promisor_remote_reinit(struct repository *r)
 200 {
 201         promisor_remote_clear(r->promisor_remote_config);
 202         FREE_AND_NULL(r->promisor_remote_config);
 203         promisor_remote_init(r);
 204 }
 205
 206 struct promisor_remote *repo_promisor_remote_find(struct repository *r,
 207                                                   const char *remote_name)
 208 {
 209         promisor_remote_init(r);
 210
 211         if (!remote_name)
 212                 return r->promisor_remote_config->promisors;
 213
 214         return promisor_remote_lookup(r->promisor_remote_config, remote_name, NULL);
 215 }
 216
 217 int repo_has_promisor_remote(struct repository *r)
 218 {
 219         return !!repo_promisor_remote_find(r, NULL);
 220 }
 221
 222 static int remove_fetched_oids(struct repository *repo,
 223                                struct object_id **oids,
 224                                int oid_nr, int to_free)
 225 {
 226         int i, remaining_nr = 0;
 227         int *remaining = xcalloc(oid_nr, sizeof(*remaining));
 228         struct object_id *old_oids = *oids;
 229         struct object_id *new_oids;
 230
 231         for (i = 0; i < oid_nr; i++)
 232                 if (oid_object_info_extended(repo, &old_oids[i], NULL,
 233                                              OBJECT_INFO_SKIP_FETCH_OBJECT)) {
 234                         remaining[i] = 1;
 235                         remaining_nr++;
 236                 }
 237
 238         if (remaining_nr) {
 239                 int j = 0;
 240                 CALLOC_ARRAY(new_oids, remaining_nr);
 241                 for (i = 0; i < oid_nr; i++)
 242                         if (remaining[i])
 243                                 oidcpy(&new_oids[j++], &old_oids[i]);
 244                 *oids = new_oids;
 245                 if (to_free)
 246                         free(old_oids);
 247         }
 248
 249         free(remaining);
 250
 251         return remaining_nr;
 252 }
 253
 254 void promisor_remote_get_direct(struct repository *repo,
 255                                 const struct object_id *oids,
 256                                 int oid_nr)
 257 {
 258         struct promisor_remote *r;
 259         struct object_id *remaining_oids = (struct object_id *)oids;
 260         int remaining_nr = oid_nr;
 261         int to_free = 0;
 262         int i;
 263
 264         if (oid_nr == 0)
 265                 return;
 266
 267         promisor_remote_init(repo);
 268
 269         for (r = repo->promisor_remote_config->promisors; r; r = r->next) {
 270                 if (fetch_objects(repo, r->name, remaining_oids, remaining_nr) < 0) {
 271                         if (remaining_nr == 1)
 272                                 continue;
 273                         remaining_nr = remove_fetched_oids(repo, &remaining_oids,
 274                                                          remaining_nr, to_free);
 275                         if (remaining_nr) {
 276                                 to_free = 1;
 277                                 continue;
 278                         }
 279                 }
 280                 goto all_fetched;
 281         }
 282
 283         for (i = 0; i < remaining_nr; i++) {
 284                 if (is_promisor_object(&remaining_oids[i]))
 285                         die(_("could not fetch %s from promisor remote"),
 286                             oid_to_hex(&remaining_oids[i]));
 287         }
 288
 289 all_fetched:
 290         if (to_free)
 291                 free(remaining_oids);
 292 }