remote.h

   1 #ifndef REMOTE_H
   2 #define REMOTE_H
   3
   4 #include "cache.h"
   5 #include "parse-options.h"
   6 #include "hashmap.h"
   7 #include "refspec.h"
   8
   9 /**
  10  * The API gives access to the configuration related to remotes. It handles
  11  * all three configuration mechanisms historically and currently used by Git,
  12  * and presents the information in a uniform fashion. Note that the code also
  13  * handles plain URLs without any configuration, giving them just the default
  14  * information.
  15  */
  16
  17 enum {
  18         REMOTE_UNCONFIGURED = 0,
  19         REMOTE_CONFIG,
  20         REMOTE_REMOTES,
  21         REMOTE_BRANCHES
  22 };
  23
  24 struct remote {
  25         struct hashmap_entry ent;
  26
  27         /* The user's nickname for the remote */
  28         const char *name;
  29
  30         int origin, configured_in_repo;
  31
  32         const char *foreign_vcs;
  33
  34         /* An array of all of the url_nr URLs configured for the remote */
  35         const char **url;
  36
  37         int url_nr;
  38         int url_alloc;
  39
  40         /* An array of all of the pushurl_nr push URLs configured for the remote */
  41         const char **pushurl;
  42
  43         int pushurl_nr;
  44         int pushurl_alloc;
  45
  46         struct refspec push;
  47
  48         struct refspec fetch;
  49
  50         /*
  51          * The setting for whether to fetch tags (as a separate rule from the
  52          * configured refspecs);
  53          * -1 to never fetch tags
  54          * 0 to auto-follow tags on heuristic (default)
  55          * 1 to always auto-follow tags
  56          * 2 to always fetch tags
  57          */
  58         int fetch_tags;
  59
  60         int skip_default_update;
  61         int mirror;
  62         int prune;
  63         int prune_tags;
  64
  65         /**
  66          * The configured helper programs to run on the remote side, for
  67          * Git-native protocols.
  68          */
  69         const char *receivepack;
  70         const char *uploadpack;
  71
  72         /* The proxy to use for curl (http, https, ftp, etc.) URLs. */
  73         char *http_proxy;
  74
  75         /* The method used for authenticating against `http_proxy`. */
  76         char *http_proxy_authmethod;
  77 };
  78
  79 /**
  80  * struct remotes can be found by name with remote_get().
  81  * remote_get(NULL) will return the default remote, given the current branch
  82  * and configuration.
  83  */
  84 struct remote *remote_get(const char *name);
  85
  86 struct remote *pushremote_get(const char *name);
  87 int remote_is_configured(struct remote *remote, int in_repo);
  88
  89 typedef int each_remote_fn(struct remote *remote, void *priv);
  90
  91 /* iterate through struct remotes */
  92 int for_each_remote(each_remote_fn fn, void *priv);
  93
  94 int remote_has_url(struct remote *remote, const char *url);
  95
  96 struct ref {
  97         struct ref *next;
  98         struct object_id old_oid;
  99         struct object_id new_oid;
 100         struct object_id old_oid_expect; /* used by expect-old */
 101         char *symref;
 102         unsigned int
 103                 force:1,
 104                 forced_update:1,
 105                 expect_old_sha1:1,
 106                 exact_oid:1,
 107                 deletion:1;
 108
 109         enum {
 110                 REF_NOT_MATCHED = 0, /* initial value */
 111                 REF_MATCHED,
 112                 REF_UNADVERTISED_NOT_ALLOWED
 113         } match_status;
 114
 115         /*
 116          * Order is important here, as we write to FETCH_HEAD
 117          * in numeric order. And the default NOT_FOR_MERGE
 118          * should be 0, so that xcalloc'd structures get it
 119          * by default.
 120          */
 121         enum {
 122                 FETCH_HEAD_MERGE = -1,
 123                 FETCH_HEAD_NOT_FOR_MERGE = 0,
 124                 FETCH_HEAD_IGNORE = 1
 125         } fetch_head_status;
 126
 127         enum {
 128                 REF_STATUS_NONE = 0,
 129                 REF_STATUS_OK,
 130                 REF_STATUS_REJECT_NONFASTFORWARD,
 131                 REF_STATUS_REJECT_ALREADY_EXISTS,
 132                 REF_STATUS_REJECT_NODELETE,
 133                 REF_STATUS_REJECT_FETCH_FIRST,
 134                 REF_STATUS_REJECT_NEEDS_FORCE,
 135                 REF_STATUS_REJECT_STALE,
 136                 REF_STATUS_REJECT_SHALLOW,
 137                 REF_STATUS_UPTODATE,
 138                 REF_STATUS_REMOTE_REJECT,
 139                 REF_STATUS_EXPECTING_REPORT,
 140                 REF_STATUS_ATOMIC_PUSH_FAILED
 141         } status;
 142         char *remote_status;
 143         struct ref *peer_ref; /* when renaming */
 144         char name[FLEX_ARRAY]; /* more */
 145 };
 146
 147 #define REF_NORMAL      (1u << 0)
 148 #define REF_HEADS       (1u << 1)
 149 #define REF_TAGS        (1u << 2)
 150
 151 struct ref *find_ref_by_name(const struct ref *list, const char *name);
 152
 153 struct ref *alloc_ref(const char *name);
 154 struct ref *copy_ref(const struct ref *ref);
 155 struct ref *copy_ref_list(const struct ref *ref);
 156 void sort_ref_list(struct ref **, int (*cmp)(const void *, const void *));
 157 int count_refspec_match(const char *, struct ref *refs, struct ref **matched_ref);
 158 int ref_compare_name(const void *, const void *);
 159
 160 int check_ref_type(const struct ref *ref, int flags);
 161
 162 /*
 163  * Free a single ref and its peer, or an entire list of refs and their peers,
 164  * respectively.
 165  */
 166 void free_one_ref(struct ref *ref);
 167 void free_refs(struct ref *ref);
 168
 169 struct oid_array;
 170 struct packet_reader;
 171 struct strvec;
 172 struct string_list;
 173 struct ref **get_remote_heads(struct packet_reader *reader,
 174                               struct ref **list, unsigned int flags,
 175                               struct oid_array *extra_have,
 176                               struct oid_array *shallow_points);
 177
 178 /* Used for protocol v2 in order to retrieve refs from a remote */
 179 struct ref **get_remote_refs(int fd_out, struct packet_reader *reader,
 180                              struct ref **list, int for_push,
 181                              const struct strvec *ref_prefixes,
 182                              const struct string_list *server_options,
 183                              int stateless_rpc);
 184
 185 int resolve_remote_symref(struct ref *ref, struct ref *list);
 186
 187 /*
 188  * Remove and free all but the first of any entries in the input list
 189  * that map the same remote reference to the same local reference.  If
 190  * there are two entries that map different remote references to the
 191  * same local reference, emit an error message and die.  Return a
 192  * pointer to the head of the resulting list.
 193  */
 194 struct ref *ref_remove_duplicates(struct ref *ref_map);
 195
 196 int query_refspecs(struct refspec *rs, struct refspec_item *query);
 197 char *apply_refspecs(struct refspec *rs, const char *name);
 198
 199 int check_push_refs(struct ref *src, struct refspec *rs);
 200 int match_push_refs(struct ref *src, struct ref **dst,
 201                     struct refspec *rs, int flags);
 202 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
 203         int force_update);
 204
 205 /*
 206  * Given a list of the remote refs and the specification of things to
 207  * fetch, makes a (separate) list of the refs to fetch and the local
 208  * refs to store into.
 209  *
 210  * *tail is the pointer to the tail pointer of the list of results
 211  * beforehand, and will be set to the tail pointer of the list of
 212  * results afterward.
 213  *
 214  * missing_ok is usually false, but when we are adding branch.$name.merge
 215  * it is Ok if the branch is not at the remote anymore.
 216  */
 217 int get_fetch_map(const struct ref *remote_refs, const struct refspec_item *refspec,
 218                   struct ref ***tail, int missing_ok);
 219
 220 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name);
 221
 222 /*
 223  * For the given remote, reads the refspec's src and sets the other fields.
 224  */
 225 int remote_find_tracking(struct remote *remote, struct refspec_item *refspec);
 226
 227 /**
 228  * struct branch holds the configuration for a branch. It can be looked up with
 229  * branch_get(name) for "refs/heads/{name}", or with branch_get(NULL) for HEAD.
 230  */
 231 struct branch {
 232
 233         /* The short name of the branch. */
 234         const char *name;
 235
 236         /* The full path for the branch ref. */
 237         const char *refname;
 238
 239         /* The name of the remote listed in the configuration. */
 240         const char *remote_name;
 241
 242         const char *pushremote_name;
 243
 244         /* An array of the "merge" lines in the configuration. */
 245         const char **merge_name;
 246
 247         /**
 248          * An array of the struct refspecs used for the merge lines. That is,
 249          * merge[i]->dst is a local tracking ref which should be merged into this
 250          * branch by default.
 251          */
 252         struct refspec_item **merge;
 253
 254         /* The number of merge configurations */
 255         int merge_nr;
 256
 257         int merge_alloc;
 258
 259         const char *push_tracking_ref;
 260 };
 261
 262 struct branch *branch_get(const char *name);
 263 const char *remote_for_branch(struct branch *branch, int *explicit);
 264 const char *pushremote_for_branch(struct branch *branch, int *explicit);
 265 const char *remote_ref_for_branch(struct branch *branch, int for_push);
 266
 267 /* returns true if the given branch has merge configuration given. */
 268 int branch_has_merge_config(struct branch *branch);
 269
 270 int branch_merge_matches(struct branch *, int n, const char *);
 271
 272 /**
 273  * Return the fully-qualified refname of the tracking branch for `branch`.
 274  * I.e., what "branch@{upstream}" would give you. Returns NULL if no
 275  * upstream is defined.
 276  *
 277  * If `err` is not NULL and no upstream is defined, a more specific error
 278  * message is recorded there (if the function does not return NULL, then
 279  * `err` is not touched).
 280  */
 281 const char *branch_get_upstream(struct branch *branch, struct strbuf *err);
 282
 283 /**
 284  * Return the tracking branch that corresponds to the ref we would push to
 285  * given a bare `git push` while `branch` is checked out.
 286  *
 287  * The return value and `err` conventions match those of `branch_get_upstream`.
 288  */
 289 const char *branch_get_push(struct branch *branch, struct strbuf *err);
 290
 291 /* Flags to match_refs. */
 292 enum match_refs_flags {
 293         MATCH_REFS_NONE         = 0,
 294         MATCH_REFS_ALL          = (1 << 0),
 295         MATCH_REFS_MIRROR       = (1 << 1),
 296         MATCH_REFS_PRUNE        = (1 << 2),
 297         MATCH_REFS_FOLLOW_TAGS  = (1 << 3)
 298 };
 299
 300 /* Flags for --ahead-behind option. */
 301 enum ahead_behind_flags {
 302         AHEAD_BEHIND_UNSPECIFIED = -1,
 303         AHEAD_BEHIND_QUICK       =  0,  /* just eq/neq reporting */
 304         AHEAD_BEHIND_FULL        =  1,  /* traditional a/b reporting */
 305 };
 306
 307 /* Reporting of tracking info */
 308 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
 309                        const char **upstream_name, int for_push,
 310                        enum ahead_behind_flags abf);
 311 int format_tracking_info(struct branch *branch, struct strbuf *sb,
 312                          enum ahead_behind_flags abf);
 313
 314 struct ref *get_local_heads(void);
 315 /*
 316  * Find refs from a list which are likely to be pointed to by the given HEAD
 317  * ref. If 'all' is false, returns the most likely ref; otherwise, returns a
 318  * list of all candidate refs. If no match is found (or 'head' is NULL),
 319  * returns NULL. All returns are newly allocated and should be freed.
 320  */
 321 struct ref *guess_remote_head(const struct ref *head,
 322                               const struct ref *refs,
 323                               int all);
 324
 325 /* Return refs which no longer exist on remote */
 326 struct ref *get_stale_heads(struct refspec *rs, struct ref *fetch_map);
 327
 328 /*
 329  * Compare-and-swap
 330  */
 331 #define CAS_OPT_NAME "force-with-lease"
 332
 333 struct push_cas_option {
 334         unsigned use_tracking_for_rest:1;
 335         struct push_cas {
 336                 struct object_id expect;
 337                 unsigned use_tracking:1;
 338                 char *refname;
 339         } *entry;
 340         int nr;
 341         int alloc;
 342 };
 343
 344 int parseopt_push_cas_option(const struct option *, const char *arg, int unset);
 345
 346 int is_empty_cas(const struct push_cas_option *);
 347 void apply_push_cas(struct push_cas_option *, struct remote *, struct ref *);
 348
 349 #endif