2 372ccdbb 2018-06-10 stsp * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
4 372ccdbb 2018-06-10 stsp * Permission to use, copy, modify, and distribute this software for any
5 372ccdbb 2018-06-10 stsp * purpose with or without fee is hereby granted, provided that the above
6 372ccdbb 2018-06-10 stsp * copyright notice and this permission notice appear in all copies.
8 372ccdbb 2018-06-10 stsp * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 372ccdbb 2018-06-10 stsp * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 372ccdbb 2018-06-10 stsp * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 372ccdbb 2018-06-10 stsp * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 372ccdbb 2018-06-10 stsp * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 372ccdbb 2018-06-10 stsp * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 372ccdbb 2018-06-10 stsp * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 372ccdbb 2018-06-10 stsp #include <sys/types.h>
18 372ccdbb 2018-06-10 stsp #include <sys/stat.h>
19 372ccdbb 2018-06-10 stsp #include <sys/queue.h>
20 372ccdbb 2018-06-10 stsp #include <sys/stdint.h>
22 372ccdbb 2018-06-10 stsp #include <stdio.h>
23 372ccdbb 2018-06-10 stsp #include <stdlib.h>
24 372ccdbb 2018-06-10 stsp #include <string.h>
25 372ccdbb 2018-06-10 stsp #include <sha1.h>
26 372ccdbb 2018-06-10 stsp #include <zlib.h>
27 372ccdbb 2018-06-10 stsp #include <ctype.h>
29 372ccdbb 2018-06-10 stsp #include "got_error.h"
30 372ccdbb 2018-06-10 stsp #include "got_object.h"
31 372ccdbb 2018-06-10 stsp #include "got_commit_graph.h"
33 372ccdbb 2018-06-10 stsp #include "got_lib_delta.h"
34 63581804 2018-07-09 stsp #include "got_lib_inflate.h"
35 372ccdbb 2018-06-10 stsp #include "got_lib_object.h"
36 372ccdbb 2018-06-10 stsp #include "got_lib_object_idset.h"
37 31cedeaf 2018-09-15 stsp #include "got_lib_path.h"
39 372ccdbb 2018-06-10 stsp struct got_commit_graph_node {
40 372ccdbb 2018-06-10 stsp struct got_object_id id;
43 372ccdbb 2018-06-10 stsp * Each graph node corresponds to a commit object.
44 f4ceb45e 2018-07-23 stsp * Graph vertices are modelled with an adjacency list.
45 f4ceb45e 2018-07-23 stsp * Adjacencies of a graph node are parent (older) commits.
47 b43fbaa0 2018-06-11 stsp int nparents;
48 79f35eb3 2018-06-11 stsp struct got_object_id_queue parent_ids;
50 b43fbaa0 2018-06-11 stsp time_t commit_timestamp;
52 372ccdbb 2018-06-10 stsp /* Used during graph iteration. */
53 372ccdbb 2018-06-10 stsp TAILQ_ENTRY(got_commit_graph_node) entry;
56 9ba79e04 2018-06-11 stsp TAILQ_HEAD(got_commit_graph_iter_list, got_commit_graph_node);
58 b565f6f8 2018-07-23 stsp struct got_commit_graph_branch_tip {
59 b565f6f8 2018-07-23 stsp struct got_object_id id;
60 b565f6f8 2018-07-23 stsp struct got_commit_graph_node *node;
63 372ccdbb 2018-06-10 stsp struct got_commit_graph {
64 372ccdbb 2018-06-10 stsp /* The set of all commits we have traversed. */
65 372ccdbb 2018-06-10 stsp struct got_object_idset *node_ids;
67 372ccdbb 2018-06-10 stsp /* The commit at which traversal began (youngest commit in node_ids). */
68 372ccdbb 2018-06-10 stsp struct got_commit_graph_node *head_node;
71 0ed6ed4c 2018-06-13 stsp #define GOT_COMMIT_GRAPH_FIRST_PARENT_TRAVERSAL 0x01
74 372ccdbb 2018-06-10 stsp * A set of object IDs of known parent commits which we have not yet
75 372ccdbb 2018-06-10 stsp * traversed. Each commit ID in this set represents a branch in commit
76 372ccdbb 2018-06-10 stsp * history: Either the first-parent branch of the head node, or another
77 372ccdbb 2018-06-10 stsp * branch corresponding to a traversed merge commit for which we have
78 372ccdbb 2018-06-10 stsp * not traversed a branch point commit yet.
80 372ccdbb 2018-06-10 stsp * Whenever we add a commit with a matching ID to the graph, we remove
81 372ccdbb 2018-06-10 stsp * its corresponding element from this set, and add new elements for
82 372ccdbb 2018-06-10 stsp * each of that commit's parent commits which were not traversed yet.
84 372ccdbb 2018-06-10 stsp * When API users ask us to fetch more commits, we fetch commits from
85 372ccdbb 2018-06-10 stsp * all currently open branches. This allows API users to process
86 372ccdbb 2018-06-10 stsp * commits in linear order even though the history contains branches.
88 372ccdbb 2018-06-10 stsp struct got_object_idset *open_branches;
90 b565f6f8 2018-07-23 stsp /* Copy of known branch tips for fetch_commits_from_open_branches(). */
91 b565f6f8 2018-07-23 stsp struct got_commit_graph_branch_tip *tips;
92 b565f6f8 2018-07-23 stsp size_t ntips;
93 b565f6f8 2018-07-23 stsp #define GOT_COMMIT_GRAPH_MIN_TIPS 100 /* minimum amount of tips to allocate */
95 31cedeaf 2018-09-15 stsp /* Path of tree entry of interest to the API user. */
98 372ccdbb 2018-06-10 stsp /* The next commit to return when the API user asks for one. */
99 372ccdbb 2018-06-10 stsp struct got_commit_graph_node *iter_node;
101 9ba79e04 2018-06-11 stsp /* The graph iteration list contains all nodes in sorted order. */
102 9ba79e04 2018-06-11 stsp struct got_commit_graph_iter_list iter_list;
105 372ccdbb 2018-06-10 stsp static struct got_commit_graph *
106 31cedeaf 2018-09-15 stsp alloc_graph(const char *path)
108 372ccdbb 2018-06-10 stsp struct got_commit_graph *graph;
110 372ccdbb 2018-06-10 stsp graph = calloc(1, sizeof(*graph));
111 372ccdbb 2018-06-10 stsp if (graph == NULL)
112 372ccdbb 2018-06-10 stsp return NULL;
114 31cedeaf 2018-09-15 stsp graph->path = strdup(path);
115 31cedeaf 2018-09-15 stsp if (graph->path == NULL) {
116 31cedeaf 2018-09-15 stsp free(graph);
117 31cedeaf 2018-09-15 stsp return NULL;
120 60f2eee1 2018-07-08 stsp graph->node_ids = got_object_idset_alloc();
121 372ccdbb 2018-06-10 stsp if (graph->node_ids == NULL) {
122 31cedeaf 2018-09-15 stsp free(graph->path);
123 372ccdbb 2018-06-10 stsp free(graph);
124 372ccdbb 2018-06-10 stsp return NULL;
127 60f2eee1 2018-07-08 stsp graph->open_branches = got_object_idset_alloc();
128 372ccdbb 2018-06-10 stsp if (graph->open_branches == NULL) {
129 372ccdbb 2018-06-10 stsp got_object_idset_free(graph->node_ids);
130 31cedeaf 2018-09-15 stsp free(graph->path);
131 372ccdbb 2018-06-10 stsp free(graph);
132 372ccdbb 2018-06-10 stsp return NULL;
135 31920504 2018-06-11 stsp TAILQ_INIT(&graph->iter_list);
136 372ccdbb 2018-06-10 stsp return graph;
141 372ccdbb 2018-06-10 stsp is_head_node(struct got_commit_graph_node *node)
143 372ccdbb 2018-06-10 stsp return node->nchildren == 0;
147 372ccdbb 2018-06-10 stsp is_merge_point(struct got_commit_graph_node *node)
149 b43fbaa0 2018-06-11 stsp return node->nparents > 1;
153 372ccdbb 2018-06-10 stsp is_branch_point(struct got_commit_graph_node *node)
155 372ccdbb 2018-06-10 stsp return node->nchildren > 1;
159 372ccdbb 2018-06-10 stsp is_root_node(struct got_commit_graph_node *node)
161 b43fbaa0 2018-06-11 stsp return node->nparents == 0;
165 31cedeaf 2018-09-15 stsp static const struct got_error *
166 31cedeaf 2018-09-15 stsp detect_changed_path(int *changed, struct got_commit_object *commit,
167 31cedeaf 2018-09-15 stsp struct got_object_id *commit_id, const char *path,
168 31cedeaf 2018-09-15 stsp struct got_repository *repo)
170 31cedeaf 2018-09-15 stsp const struct got_error *err = NULL;
171 31cedeaf 2018-09-15 stsp struct got_commit_object *pcommit = NULL;
172 31cedeaf 2018-09-15 stsp struct got_tree_object *tree = NULL, *ptree = NULL;
173 31cedeaf 2018-09-15 stsp struct got_object_qid *pid;
175 31cedeaf 2018-09-15 stsp if (got_path_is_root_dir(path)) {
176 31cedeaf 2018-09-15 stsp *changed = 1;
177 31cedeaf 2018-09-15 stsp return NULL;
180 31cedeaf 2018-09-15 stsp *changed = 0;
182 31cedeaf 2018-09-15 stsp err = got_object_open_as_tree(&tree, repo, commit->tree_id);
184 31cedeaf 2018-09-15 stsp return err;
186 31cedeaf 2018-09-15 stsp pid = SIMPLEQ_FIRST(&commit->parent_ids);
187 31cedeaf 2018-09-15 stsp if (pid == NULL) {
188 31cedeaf 2018-09-15 stsp struct got_object_id *obj_id;
189 31cedeaf 2018-09-15 stsp err = got_object_id_by_path(&obj_id, repo, commit_id, path);
191 31cedeaf 2018-09-15 stsp err = NULL;
193 31cedeaf 2018-09-15 stsp *changed = 1;
194 31cedeaf 2018-09-15 stsp free(obj_id);
198 31cedeaf 2018-09-15 stsp err = got_object_open_as_commit(&pcommit, repo, pid->id);
202 31cedeaf 2018-09-15 stsp err = got_object_open_as_tree(&ptree, repo, pcommit->tree_id);
206 31cedeaf 2018-09-15 stsp err = got_object_tree_path_changed(changed, tree, ptree, path, repo);
209 31cedeaf 2018-09-15 stsp got_object_tree_close(tree);
211 31cedeaf 2018-09-15 stsp got_object_tree_close(ptree);
212 31cedeaf 2018-09-15 stsp if (pcommit)
213 31cedeaf 2018-09-15 stsp got_object_commit_close(pcommit);
214 31cedeaf 2018-09-15 stsp return err;
217 4626e416 2018-06-10 stsp static void
218 9ba79e04 2018-06-11 stsp add_node_to_iter_list(struct got_commit_graph *graph,
219 9ba79e04 2018-06-11 stsp struct got_commit_graph_node *node,
220 9ba79e04 2018-06-11 stsp struct got_commit_graph_node *child_node)
222 4bd3f2bb 2018-06-10 stsp struct got_commit_graph_node *n, *next;
224 31920504 2018-06-11 stsp if (TAILQ_EMPTY(&graph->iter_list)) {
225 31920504 2018-06-11 stsp TAILQ_INSERT_TAIL(&graph->iter_list, node, entry);
229 fe8df4c2 2018-06-16 stsp /* Ensure that an iteration in progress will see this new commit. */
230 fe8df4c2 2018-06-16 stsp if (graph->iter_node) {
231 fe8df4c2 2018-06-16 stsp n = graph->iter_node;
232 fe8df4c2 2018-06-16 stsp while (n) {
233 fe8df4c2 2018-06-16 stsp next = TAILQ_NEXT(n, entry);
234 fe8df4c2 2018-06-16 stsp if (next &&
235 fe8df4c2 2018-06-16 stsp node->commit_timestamp >= next->commit_timestamp) {
236 fe8df4c2 2018-06-16 stsp TAILQ_INSERT_BEFORE(next, node, entry);
241 fe8df4c2 2018-06-16 stsp TAILQ_INSERT_AFTER(&graph->iter_list, graph->iter_node,
242 fe8df4c2 2018-06-16 stsp node, entry);
247 58e5f354 2018-06-11 stsp * If a child node is known, begin looping over the list there
248 a37db869 2018-06-11 stsp * instead of beginning from the list head.
250 58e5f354 2018-06-11 stsp n = child_node ? child_node : TAILQ_FIRST(&graph->iter_list);
252 d2312330 2018-06-11 stsp /* Insert into list based on committer timestamp. */
254 d2312330 2018-06-11 stsp if (node->commit_timestamp == n->commit_timestamp) {
255 d2312330 2018-06-11 stsp TAILQ_INSERT_AFTER(&graph->iter_list, n, node, entry);
257 d2312330 2018-06-11 stsp } else if (node->commit_timestamp < n->commit_timestamp) {
258 4bd3f2bb 2018-06-10 stsp next = TAILQ_NEXT(n, entry);
259 4bd3f2bb 2018-06-10 stsp if (next == NULL) {
260 31920504 2018-06-11 stsp TAILQ_INSERT_AFTER(&graph->iter_list, n,
261 4bd3f2bb 2018-06-10 stsp node, entry);
264 b43fbaa0 2018-06-11 stsp if (node->commit_timestamp >= next->commit_timestamp) {
265 4bd3f2bb 2018-06-10 stsp TAILQ_INSERT_BEFORE(next, node, entry);
269 4bd3f2bb 2018-06-10 stsp TAILQ_INSERT_BEFORE(n, node, entry);
272 9ba79e04 2018-06-11 stsp n = TAILQ_NEXT(n, entry);
273 9ba79e04 2018-06-11 stsp } while (n);
276 372ccdbb 2018-06-10 stsp static const struct got_error *
277 79f35eb3 2018-06-11 stsp add_vertex(struct got_object_id_queue *ids, struct got_object_id *id)
279 79f35eb3 2018-06-11 stsp struct got_object_qid *qid;
281 79f35eb3 2018-06-11 stsp qid = calloc(1, sizeof(*qid));
282 79f35eb3 2018-06-11 stsp if (qid == NULL)
283 b43fbaa0 2018-06-11 stsp return got_error_from_errno();
285 79f35eb3 2018-06-11 stsp qid->id = got_object_id_dup(id);
286 79f35eb3 2018-06-11 stsp if (qid->id == NULL) {
287 b43fbaa0 2018-06-11 stsp const struct got_error *err = got_error_from_errno();
288 fa2f6902 2018-07-23 stsp got_object_qid_free(qid);
289 b43fbaa0 2018-06-11 stsp return err;
292 79f35eb3 2018-06-11 stsp SIMPLEQ_INSERT_TAIL(ids, qid, entry);
293 0ed6ed4c 2018-06-13 stsp return NULL;
296 0ed6ed4c 2018-06-13 stsp static const struct got_error *
297 31cedeaf 2018-09-15 stsp close_branch(struct got_commit_graph *graph, struct got_object_id *commit_id)
299 31cedeaf 2018-09-15 stsp const struct got_error *err;
301 31cedeaf 2018-09-15 stsp err = got_object_idset_remove(NULL, graph->open_branches, commit_id);
302 31cedeaf 2018-09-15 stsp if (err && err->code != GOT_ERR_NO_OBJ)
303 31cedeaf 2018-09-15 stsp return err;
304 31cedeaf 2018-09-15 stsp return NULL;
307 31cedeaf 2018-09-15 stsp static const struct got_error *
308 31cedeaf 2018-09-15 stsp advance_branch(struct got_commit_graph *graph,
309 0ed6ed4c 2018-06-13 stsp struct got_commit_graph_node *node,
310 0ed6ed4c 2018-06-13 stsp struct got_object_id *commit_id, struct got_commit_object *commit)
312 0ed6ed4c 2018-06-13 stsp const struct got_error *err;
313 0ed6ed4c 2018-06-13 stsp struct got_object_qid *qid;
315 31cedeaf 2018-09-15 stsp err = close_branch(graph, commit_id);
317 0ed6ed4c 2018-06-13 stsp return err;
319 0ed6ed4c 2018-06-13 stsp if (graph->flags & GOT_COMMIT_GRAPH_FIRST_PARENT_TRAVERSAL) {
320 0ed6ed4c 2018-06-13 stsp qid = SIMPLEQ_FIRST(&commit->parent_ids);
321 0ed6ed4c 2018-06-13 stsp if (qid == NULL)
322 0ed6ed4c 2018-06-13 stsp return NULL;
323 0ed6ed4c 2018-06-13 stsp err = got_object_idset_add(NULL, graph->open_branches, qid->id,
325 0ed6ed4c 2018-06-13 stsp if (err && err->code != GOT_ERR_OBJ_EXISTS)
326 0ed6ed4c 2018-06-13 stsp return err;
327 0ed6ed4c 2018-06-13 stsp return NULL;
330 0ed6ed4c 2018-06-13 stsp SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
331 0ed6ed4c 2018-06-13 stsp if (got_object_idset_get(graph->node_ids, qid->id))
332 0ed6ed4c 2018-06-13 stsp continue; /* parent already traversed */
333 0ed6ed4c 2018-06-13 stsp err = got_object_idset_add(NULL, graph->open_branches,
334 0ed6ed4c 2018-06-13 stsp qid->id, node);
335 0ed6ed4c 2018-06-13 stsp if (err && err->code != GOT_ERR_OBJ_EXISTS)
336 0ed6ed4c 2018-06-13 stsp return err;
339 b43fbaa0 2018-06-11 stsp return NULL;
342 fb5b9d5a 2018-07-23 stsp static void
343 fb5b9d5a 2018-07-23 stsp free_node(struct got_commit_graph_node *node)
345 fb5b9d5a 2018-07-23 stsp while (!SIMPLEQ_EMPTY(&node->parent_ids)) {
346 fb5b9d5a 2018-07-23 stsp struct got_object_qid *pid = SIMPLEQ_FIRST(&node->parent_ids);
347 fb5b9d5a 2018-07-23 stsp SIMPLEQ_REMOVE_HEAD(&node->parent_ids, entry);
348 fa2f6902 2018-07-23 stsp got_object_qid_free(pid);
350 fb5b9d5a 2018-07-23 stsp free(node);
353 b43fbaa0 2018-06-11 stsp static const struct got_error *
354 372ccdbb 2018-06-10 stsp add_node(struct got_commit_graph_node **new_node,
355 372ccdbb 2018-06-10 stsp struct got_commit_graph *graph, struct got_object_id *commit_id,
356 31cedeaf 2018-09-15 stsp struct got_commit_object *commit, struct got_commit_graph_node *child_node,
357 31cedeaf 2018-09-15 stsp struct got_repository *repo)
359 372ccdbb 2018-06-10 stsp const struct got_error *err = NULL;
360 f4ceb45e 2018-07-23 stsp struct got_commit_graph_node *node;
361 fa2f6902 2018-07-23 stsp struct got_object_qid *pid;
362 31cedeaf 2018-09-15 stsp int changed = 0, branch_done = 0;
364 372ccdbb 2018-06-10 stsp *new_node = NULL;
366 372ccdbb 2018-06-10 stsp node = calloc(1, sizeof(*node));
367 372ccdbb 2018-06-10 stsp if (node == NULL)
368 372ccdbb 2018-06-10 stsp return got_error_from_errno();
370 372ccdbb 2018-06-10 stsp memcpy(&node->id, commit_id, sizeof(node->id));
371 b43fbaa0 2018-06-11 stsp SIMPLEQ_INIT(&node->parent_ids);
372 fa2f6902 2018-07-23 stsp SIMPLEQ_FOREACH(pid, &commit->parent_ids, entry) {
373 fa2f6902 2018-07-23 stsp err = add_vertex(&node->parent_ids, pid->id);
375 fb5b9d5a 2018-07-23 stsp free_node(node);
376 b43fbaa0 2018-06-11 stsp return err;
378 b43fbaa0 2018-06-11 stsp node->nparents++;
381 f4ceb45e 2018-07-23 stsp err = got_object_idset_add(NULL, graph->node_ids, &node->id, node);
383 f4ceb45e 2018-07-23 stsp if (err->code == GOT_ERR_OBJ_EXISTS)
384 f4ceb45e 2018-07-23 stsp err = NULL;
385 fb5b9d5a 2018-07-23 stsp free_node(node);
386 372ccdbb 2018-06-10 stsp return err;
389 31cedeaf 2018-09-15 stsp err = detect_changed_path(&changed, commit, commit_id, graph->path,
392 31cedeaf 2018-09-15 stsp if (err->code == GOT_ERR_NO_OBJ) {
394 31cedeaf 2018-09-15 stsp * History of the path stops here on the current
395 31cedeaf 2018-09-15 stsp * branch. Keep going on other branches.
397 31cedeaf 2018-09-15 stsp err = NULL;
398 31cedeaf 2018-09-15 stsp branch_done = 1;
400 31cedeaf 2018-09-15 stsp free_node(node);
401 31cedeaf 2018-09-15 stsp return err;
405 1c7a5dcb 2018-09-15 stsp if (changed) {
406 1c7a5dcb 2018-09-15 stsp node->commit_timestamp = mktime(&commit->tm_committer);
407 1c7a5dcb 2018-09-15 stsp if (node->commit_timestamp == -1) {
408 1c7a5dcb 2018-09-15 stsp free_node(node);
409 1c7a5dcb 2018-09-15 stsp return got_error_from_errno();
411 31cedeaf 2018-09-15 stsp add_node_to_iter_list(graph, node, child_node);
414 31cedeaf 2018-09-15 stsp if (branch_done)
415 31cedeaf 2018-09-15 stsp err = close_branch(graph, commit_id);
417 31cedeaf 2018-09-15 stsp err = advance_branch(graph, node, commit_id, commit);
419 f4ceb45e 2018-07-23 stsp free_node(node);
421 f4ceb45e 2018-07-23 stsp *new_node = node;
423 c4d7a9c4 2018-06-11 stsp return err;
426 c4d7a9c4 2018-06-11 stsp const struct got_error *
427 c4d7a9c4 2018-06-11 stsp got_commit_graph_open(struct got_commit_graph **graph,
428 31cedeaf 2018-09-15 stsp struct got_object_id *commit_id, const char *path,
429 31cedeaf 2018-09-15 stsp int first_parent_traversal, struct got_repository *repo)
431 c4d7a9c4 2018-06-11 stsp const struct got_error *err = NULL;
432 c4d7a9c4 2018-06-11 stsp struct got_commit_object *commit;
434 c4d7a9c4 2018-06-11 stsp *graph = NULL;
436 be6a1b5a 2018-06-11 stsp err = got_object_open_as_commit(&commit, repo, commit_id);
438 372ccdbb 2018-06-10 stsp return err;
440 31cedeaf 2018-09-15 stsp /* The path must exist in our initial commit. */
441 31cedeaf 2018-09-15 stsp if (!got_path_is_root_dir(path)) {
442 31cedeaf 2018-09-15 stsp struct got_object_id *obj_id;
443 31cedeaf 2018-09-15 stsp err = got_object_id_by_path(&obj_id, repo, commit_id, path);
445 31cedeaf 2018-09-15 stsp return err;
446 31cedeaf 2018-09-15 stsp free(obj_id);
449 31cedeaf 2018-09-15 stsp *graph = alloc_graph(path);
450 372ccdbb 2018-06-10 stsp if (*graph == NULL) {
451 372ccdbb 2018-06-10 stsp got_object_commit_close(commit);
452 372ccdbb 2018-06-10 stsp return got_error_from_errno();
455 0ed6ed4c 2018-06-13 stsp if (first_parent_traversal)
456 0ed6ed4c 2018-06-13 stsp (*graph)->flags |= GOT_COMMIT_GRAPH_FIRST_PARENT_TRAVERSAL;
458 31cedeaf 2018-09-15 stsp err = add_node(&(*graph)->head_node, *graph, commit_id, commit, NULL,
460 b43fbaa0 2018-06-11 stsp got_object_commit_close(commit);
462 372ccdbb 2018-06-10 stsp got_commit_graph_close(*graph);
463 372ccdbb 2018-06-10 stsp *graph = NULL;
464 372ccdbb 2018-06-10 stsp return err;
467 372ccdbb 2018-06-10 stsp return NULL;
470 b565f6f8 2018-07-23 stsp struct gather_branch_tips_arg {
471 b565f6f8 2018-07-23 stsp struct got_commit_graph_branch_tip *tips;
475 372ccdbb 2018-06-10 stsp static void
476 b565f6f8 2018-07-23 stsp gather_branch_tips(struct got_object_id *id, void *data, void *arg)
478 b565f6f8 2018-07-23 stsp struct gather_branch_tips_arg *a = arg;
479 b565f6f8 2018-07-23 stsp memcpy(&a->tips[a->ntips].id, id, sizeof(*id));
480 b565f6f8 2018-07-23 stsp a->tips[a->ntips].node = data;
481 b565f6f8 2018-07-23 stsp a->ntips++;
484 1142eae9 2018-06-11 stsp static const struct got_error *
485 1142eae9 2018-06-11 stsp fetch_commits_from_open_branches(int *ncommits, int *wanted_id_added,
486 31cedeaf 2018-09-15 stsp struct got_object_id **changed_id, struct got_commit_graph *graph,
487 31cedeaf 2018-09-15 stsp struct got_repository *repo, struct got_object_id *wanted_id)
489 372ccdbb 2018-06-10 stsp const struct got_error *err;
490 b565f6f8 2018-07-23 stsp struct gather_branch_tips_arg arg;
493 372ccdbb 2018-06-10 stsp *ncommits = 0;
494 1142eae9 2018-06-11 stsp if (wanted_id_added)
495 1142eae9 2018-06-11 stsp *wanted_id_added = 0;
496 31cedeaf 2018-09-15 stsp if (changed_id)
497 31cedeaf 2018-09-15 stsp *changed_id = NULL;
499 b565f6f8 2018-07-23 stsp arg.ntips = got_object_idset_num_elements(graph->open_branches);
500 b565f6f8 2018-07-23 stsp if (arg.ntips == 0)
501 372ccdbb 2018-06-10 stsp return NULL;
504 372ccdbb 2018-06-10 stsp * Adding nodes to the graph might change the graph's open
505 372ccdbb 2018-06-10 stsp * branches state. Create a local copy of the current state.
507 b565f6f8 2018-07-23 stsp if (graph->ntips < arg.ntips) {
508 b565f6f8 2018-07-23 stsp struct got_commit_graph_branch_tip *tips;
509 b565f6f8 2018-07-23 stsp if (arg.ntips < GOT_COMMIT_GRAPH_MIN_TIPS)
510 b565f6f8 2018-07-23 stsp arg.ntips = GOT_COMMIT_GRAPH_MIN_TIPS;
511 b565f6f8 2018-07-23 stsp tips = reallocarray(graph->tips, arg.ntips, sizeof(*tips));
512 b565f6f8 2018-07-23 stsp if (tips == NULL)
513 b565f6f8 2018-07-23 stsp return got_error_from_errno();
514 b565f6f8 2018-07-23 stsp graph->tips = tips;
515 b565f6f8 2018-07-23 stsp graph->ntips = arg.ntips;
517 b565f6f8 2018-07-23 stsp arg.ntips = 0; /* reset; gather_branch_tips() will increment */
518 b565f6f8 2018-07-23 stsp arg.tips = graph->tips;
519 b565f6f8 2018-07-23 stsp got_object_idset_for_each(graph->open_branches,
520 b565f6f8 2018-07-23 stsp gather_branch_tips, &arg);
522 b565f6f8 2018-07-23 stsp for (i = 0; i < arg.ntips; i++) {
523 372ccdbb 2018-06-10 stsp struct got_object_id *commit_id;
524 372ccdbb 2018-06-10 stsp struct got_commit_graph_node *child_node, *new_node;
525 372ccdbb 2018-06-10 stsp struct got_commit_object *commit;
526 31cedeaf 2018-09-15 stsp int changed;
528 b565f6f8 2018-07-23 stsp commit_id = &graph->tips[i].id;
529 b565f6f8 2018-07-23 stsp child_node = graph->tips[i].node;
531 be6a1b5a 2018-06-11 stsp err = got_object_open_as_commit(&commit, repo, commit_id);
535 31cedeaf 2018-09-15 stsp err = detect_changed_path(&changed, commit, commit_id,
536 31cedeaf 2018-09-15 stsp graph->path, repo);
538 31cedeaf 2018-09-15 stsp got_object_commit_close(commit);
539 31cedeaf 2018-09-15 stsp if (err->code != GOT_ERR_NO_OBJ)
541 31cedeaf 2018-09-15 stsp err = close_branch(graph, commit_id);
546 31cedeaf 2018-09-15 stsp if (changed && changed_id && *changed_id == NULL)
547 31cedeaf 2018-09-15 stsp *changed_id = commit_id;
548 31cedeaf 2018-09-15 stsp err = add_node(&new_node, graph, commit_id, commit, child_node,
550 b43fbaa0 2018-06-11 stsp got_object_commit_close(commit);
553 372ccdbb 2018-06-10 stsp if (new_node)
554 372ccdbb 2018-06-10 stsp (*ncommits)++;
555 1142eae9 2018-06-11 stsp if (wanted_id && got_object_id_cmp(commit_id, wanted_id) == 0)
556 1142eae9 2018-06-11 stsp *wanted_id_added = 1;
559 372ccdbb 2018-06-10 stsp return err;
562 372ccdbb 2018-06-10 stsp const struct got_error *
563 31cedeaf 2018-09-15 stsp got_commit_graph_fetch_commits(struct got_commit_graph *graph, int limit,
564 31cedeaf 2018-09-15 stsp struct got_repository *repo)
566 372ccdbb 2018-06-10 stsp const struct got_error *err;
567 31cedeaf 2018-09-15 stsp int nfetched = 0, ncommits;
568 31cedeaf 2018-09-15 stsp struct got_object_id *changed_id = NULL;
570 31cedeaf 2018-09-15 stsp while (nfetched < limit) {
571 1142eae9 2018-06-11 stsp err = fetch_commits_from_open_branches(&ncommits, NULL,
572 31cedeaf 2018-09-15 stsp &changed_id, graph, repo, NULL);
574 372ccdbb 2018-06-10 stsp return err;
575 372ccdbb 2018-06-10 stsp if (ncommits == 0)
577 31cedeaf 2018-09-15 stsp if (changed_id)
578 31cedeaf 2018-09-15 stsp nfetched += ncommits;
581 372ccdbb 2018-06-10 stsp return NULL;
584 1142eae9 2018-06-11 stsp const struct got_error *
585 1142eae9 2018-06-11 stsp got_commit_graph_fetch_commits_up_to(int *nfetched,
586 1142eae9 2018-06-11 stsp struct got_commit_graph *graph, struct got_object_id *wanted_id,
587 1142eae9 2018-06-11 stsp struct got_repository *repo)
589 1142eae9 2018-06-11 stsp const struct got_error *err;
590 1142eae9 2018-06-11 stsp int ncommits, wanted_id_added = 0;
592 1142eae9 2018-06-11 stsp *nfetched = 0;
594 6e0c0f9a 2018-06-11 stsp if (got_object_idset_get(graph->node_ids, wanted_id) != NULL)
595 6e0c0f9a 2018-06-11 stsp return NULL;
597 1142eae9 2018-06-11 stsp while (!wanted_id_added) {
598 1142eae9 2018-06-11 stsp err = fetch_commits_from_open_branches(&ncommits,
599 31cedeaf 2018-09-15 stsp &wanted_id_added, NULL, graph, repo, wanted_id);
601 1142eae9 2018-06-11 stsp return err;
602 1142eae9 2018-06-11 stsp if (ncommits == 0)
603 1142eae9 2018-06-11 stsp return NULL;
604 1142eae9 2018-06-11 stsp *nfetched += ncommits;
607 1142eae9 2018-06-11 stsp return NULL;
610 372ccdbb 2018-06-10 stsp static void
611 fb5b9d5a 2018-07-23 stsp free_node_iter(struct got_object_id *id, void *data, void *arg)
613 372ccdbb 2018-06-10 stsp struct got_commit_graph_node *node = data;
614 fb5b9d5a 2018-07-23 stsp free_node(node);
618 372ccdbb 2018-06-10 stsp got_commit_graph_close(struct got_commit_graph *graph)
620 372ccdbb 2018-06-10 stsp got_object_idset_free(graph->open_branches);
621 fb5b9d5a 2018-07-23 stsp got_object_idset_for_each(graph->node_ids, free_node_iter, NULL);
622 372ccdbb 2018-06-10 stsp got_object_idset_free(graph->node_ids);
623 b565f6f8 2018-07-23 stsp free(graph->tips);
624 31cedeaf 2018-09-15 stsp free(graph->path);
625 372ccdbb 2018-06-10 stsp free(graph);
628 372ccdbb 2018-06-10 stsp const struct got_error *
629 372ccdbb 2018-06-10 stsp got_commit_graph_iter_start(struct got_commit_graph *graph,
630 31cedeaf 2018-09-15 stsp struct got_object_id *id, struct got_repository *repo)
632 31cedeaf 2018-09-15 stsp const struct got_error *err = NULL;
633 9ba79e04 2018-06-11 stsp struct got_commit_graph_node *start_node;
634 31cedeaf 2018-09-15 stsp struct got_commit_object *commit;
635 31cedeaf 2018-09-15 stsp int changed;
637 372ccdbb 2018-06-10 stsp start_node = got_object_idset_get(graph->node_ids, id);
638 372ccdbb 2018-06-10 stsp if (start_node == NULL)
639 372ccdbb 2018-06-10 stsp return got_error(GOT_ERR_NO_OBJ);
642 31cedeaf 2018-09-15 stsp err = got_object_open_as_commit(&commit, repo, &start_node->id);
644 31cedeaf 2018-09-15 stsp return err;
646 31cedeaf 2018-09-15 stsp err = detect_changed_path(&changed, commit, &start_node->id,
647 31cedeaf 2018-09-15 stsp graph->path, repo);
649 31cedeaf 2018-09-15 stsp got_object_commit_close(commit);
650 31cedeaf 2018-09-15 stsp return err;
653 31cedeaf 2018-09-15 stsp if (!changed) {
654 31cedeaf 2018-09-15 stsp /* Locate first commit which changed graph->path. */
655 31cedeaf 2018-09-15 stsp struct got_object_id *changed_id = NULL;
656 31cedeaf 2018-09-15 stsp while (changed_id == NULL) {
657 31cedeaf 2018-09-15 stsp int ncommits;
658 31cedeaf 2018-09-15 stsp err = fetch_commits_from_open_branches(&ncommits, NULL,
659 31cedeaf 2018-09-15 stsp &changed_id, graph, repo, NULL);
661 31cedeaf 2018-09-15 stsp got_object_commit_close(commit);
662 31cedeaf 2018-09-15 stsp return err;
665 31cedeaf 2018-09-15 stsp start_node = got_object_idset_get(graph->node_ids, changed_id);
667 31cedeaf 2018-09-15 stsp got_object_commit_close(commit);
669 372ccdbb 2018-06-10 stsp graph->iter_node = start_node;
670 372ccdbb 2018-06-10 stsp return NULL;
673 372ccdbb 2018-06-10 stsp const struct got_error *
674 b43fbaa0 2018-06-11 stsp got_commit_graph_iter_next(struct got_object_id **id,
675 b43fbaa0 2018-06-11 stsp struct got_commit_graph *graph)
677 9ba79e04 2018-06-11 stsp *id = NULL;
679 372ccdbb 2018-06-10 stsp if (graph->iter_node == NULL) {
680 372ccdbb 2018-06-10 stsp /* We are done interating, or iteration was not started. */
681 9ba79e04 2018-06-11 stsp return got_error(GOT_ERR_ITER_COMPLETED);
684 9ba79e04 2018-06-11 stsp if (graph->iter_node ==
685 9ba79e04 2018-06-11 stsp TAILQ_LAST(&graph->iter_list, got_commit_graph_iter_list) &&
686 9ba79e04 2018-06-11 stsp got_object_idset_num_elements(graph->open_branches) == 0) {
687 9ba79e04 2018-06-11 stsp *id = &graph->iter_node->id;
688 9ba79e04 2018-06-11 stsp /* We are done interating. */
689 9ba79e04 2018-06-11 stsp graph->iter_node = NULL;
690 372ccdbb 2018-06-10 stsp return NULL;
693 9ba79e04 2018-06-11 stsp if (TAILQ_NEXT(graph->iter_node, entry) == NULL)
694 372ccdbb 2018-06-10 stsp return got_error(GOT_ERR_ITER_NEED_MORE);
696 372ccdbb 2018-06-10 stsp *id = &graph->iter_node->id;
697 9ba79e04 2018-06-11 stsp graph->iter_node = TAILQ_NEXT(graph->iter_node, entry);
698 372ccdbb 2018-06-10 stsp return NULL;
