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![Junio C Hamano](/assets/img/avatar_default.png)
Work to support a repository that work with both SHA-1 and SHA-256 hash algorithms has started. * eb/hash-transition: (30 commits) t1016-compatObjectFormat: add tests to verify the conversion between objects t1006: test oid compatibility with cat-file t1006: rename sha1 to oid test-lib: compute the compatibility hash so tests may use it builtin/ls-tree: let the oid determine the output algorithm object-file: handle compat objects in check_object_signature tree-walk: init_tree_desc take an oid to get the hash algorithm builtin/cat-file: let the oid determine the output algorithm rev-parse: add an --output-object-format parameter repository: implement extensions.compatObjectFormat object-file: update object_info_extended to reencode objects object-file-convert: convert commits that embed signed tags object-file-convert: convert commit objects when writing object-file-convert: don't leak when converting tag objects object-file-convert: convert tag objects when writing object-file-convert: add a function to convert trees between algorithms object: factor out parse_mode out of fast-import and tree-walk into in object.h cache: add a function to read an OID of a specific algorithm tag: sign both hashes commit: export add_header_signature to support handling signatures on tags ...
437 lines
11 KiB
C
437 lines
11 KiB
C
#include "git-compat-util.h"
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#include "gettext.h"
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#include "object-store-ll.h"
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#include "reflog.h"
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#include "refs.h"
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#include "revision.h"
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#include "tree.h"
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#include "tree-walk.h"
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/* Remember to update object flag allocation in object.h */
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#define INCOMPLETE (1u<<10)
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#define STUDYING (1u<<11)
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#define REACHABLE (1u<<12)
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static int tree_is_complete(const struct object_id *oid)
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{
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struct tree_desc desc;
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struct name_entry entry;
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int complete;
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struct tree *tree;
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tree = lookup_tree(the_repository, oid);
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if (!tree)
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return 0;
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if (tree->object.flags & SEEN)
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return 1;
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if (tree->object.flags & INCOMPLETE)
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return 0;
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if (!tree->buffer) {
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enum object_type type;
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unsigned long size;
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void *data = repo_read_object_file(the_repository, oid, &type,
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&size);
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if (!data) {
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tree->object.flags |= INCOMPLETE;
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return 0;
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}
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tree->buffer = data;
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tree->size = size;
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}
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init_tree_desc(&desc, &tree->object.oid, tree->buffer, tree->size);
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complete = 1;
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while (tree_entry(&desc, &entry)) {
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if (!repo_has_object_file(the_repository, &entry.oid) ||
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(S_ISDIR(entry.mode) && !tree_is_complete(&entry.oid))) {
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tree->object.flags |= INCOMPLETE;
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complete = 0;
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}
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}
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free_tree_buffer(tree);
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if (complete)
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tree->object.flags |= SEEN;
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return complete;
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}
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static int commit_is_complete(struct commit *commit)
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{
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struct object_array study;
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struct object_array found;
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int is_incomplete = 0;
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int i;
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/* early return */
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if (commit->object.flags & SEEN)
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return 1;
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if (commit->object.flags & INCOMPLETE)
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return 0;
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/*
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* Find all commits that are reachable and are not marked as
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* SEEN. Then make sure the trees and blobs contained are
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* complete. After that, mark these commits also as SEEN.
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* If some of the objects that are needed to complete this
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* commit are missing, mark this commit as INCOMPLETE.
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*/
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memset(&study, 0, sizeof(study));
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memset(&found, 0, sizeof(found));
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add_object_array(&commit->object, NULL, &study);
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add_object_array(&commit->object, NULL, &found);
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commit->object.flags |= STUDYING;
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while (study.nr) {
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struct commit *c;
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struct commit_list *parent;
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c = (struct commit *)object_array_pop(&study);
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if (!c->object.parsed && !parse_object(the_repository, &c->object.oid))
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c->object.flags |= INCOMPLETE;
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if (c->object.flags & INCOMPLETE) {
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is_incomplete = 1;
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break;
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}
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else if (c->object.flags & SEEN)
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continue;
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for (parent = c->parents; parent; parent = parent->next) {
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struct commit *p = parent->item;
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if (p->object.flags & STUDYING)
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continue;
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p->object.flags |= STUDYING;
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add_object_array(&p->object, NULL, &study);
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add_object_array(&p->object, NULL, &found);
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}
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}
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if (!is_incomplete) {
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/*
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* make sure all commits in "found" array have all the
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* necessary objects.
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*/
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for (i = 0; i < found.nr; i++) {
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struct commit *c =
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(struct commit *)found.objects[i].item;
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if (!tree_is_complete(get_commit_tree_oid(c))) {
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is_incomplete = 1;
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c->object.flags |= INCOMPLETE;
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}
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}
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if (!is_incomplete) {
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/* mark all found commits as complete, iow SEEN */
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for (i = 0; i < found.nr; i++)
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found.objects[i].item->flags |= SEEN;
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}
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}
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/* clear flags from the objects we traversed */
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for (i = 0; i < found.nr; i++)
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found.objects[i].item->flags &= ~STUDYING;
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if (is_incomplete)
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commit->object.flags |= INCOMPLETE;
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else {
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/*
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* If we come here, we have (1) traversed the ancestry chain
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* from the "commit" until we reach SEEN commits (which are
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* known to be complete), and (2) made sure that the commits
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* encountered during the above traversal refer to trees that
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* are complete. Which means that we know *all* the commits
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* we have seen during this process are complete.
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*/
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for (i = 0; i < found.nr; i++)
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found.objects[i].item->flags |= SEEN;
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}
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/* free object arrays */
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object_array_clear(&study);
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object_array_clear(&found);
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return !is_incomplete;
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}
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static int keep_entry(struct commit **it, struct object_id *oid)
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{
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struct commit *commit;
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if (is_null_oid(oid))
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return 1;
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commit = lookup_commit_reference_gently(the_repository, oid, 1);
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if (!commit)
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return 0;
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/*
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* Make sure everything in this commit exists.
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*
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* We have walked all the objects reachable from the refs
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* and cache earlier. The commits reachable by this commit
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* must meet SEEN commits -- and then we should mark them as
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* SEEN as well.
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*/
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if (!commit_is_complete(commit))
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return 0;
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*it = commit;
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return 1;
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}
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/*
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* Starting from commits in the cb->mark_list, mark commits that are
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* reachable from them. Stop the traversal at commits older than
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* the expire_limit and queue them back, so that the caller can call
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* us again to restart the traversal with longer expire_limit.
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*/
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static void mark_reachable(struct expire_reflog_policy_cb *cb)
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{
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struct commit_list *pending;
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timestamp_t expire_limit = cb->mark_limit;
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struct commit_list *leftover = NULL;
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for (pending = cb->mark_list; pending; pending = pending->next)
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pending->item->object.flags &= ~REACHABLE;
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pending = cb->mark_list;
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while (pending) {
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struct commit_list *parent;
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struct commit *commit = pop_commit(&pending);
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if (commit->object.flags & REACHABLE)
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continue;
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if (repo_parse_commit(the_repository, commit))
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continue;
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commit->object.flags |= REACHABLE;
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if (commit->date < expire_limit) {
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commit_list_insert(commit, &leftover);
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continue;
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}
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parent = commit->parents;
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while (parent) {
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commit = parent->item;
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parent = parent->next;
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if (commit->object.flags & REACHABLE)
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continue;
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commit_list_insert(commit, &pending);
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}
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}
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cb->mark_list = leftover;
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}
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static int unreachable(struct expire_reflog_policy_cb *cb, struct commit *commit, struct object_id *oid)
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{
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/*
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* We may or may not have the commit yet - if not, look it
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* up using the supplied sha1.
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*/
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if (!commit) {
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if (is_null_oid(oid))
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return 0;
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commit = lookup_commit_reference_gently(the_repository, oid,
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1);
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/* Not a commit -- keep it */
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if (!commit)
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return 0;
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}
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/* Reachable from the current ref? Don't prune. */
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if (commit->object.flags & REACHABLE)
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return 0;
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if (cb->mark_list && cb->mark_limit) {
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cb->mark_limit = 0; /* dig down to the root */
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mark_reachable(cb);
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}
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return !(commit->object.flags & REACHABLE);
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}
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/*
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* Return true iff the specified reflog entry should be expired.
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*/
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int should_expire_reflog_ent(struct object_id *ooid, struct object_id *noid,
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const char *email UNUSED,
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timestamp_t timestamp, int tz UNUSED,
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const char *message UNUSED, void *cb_data)
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{
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struct expire_reflog_policy_cb *cb = cb_data;
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struct commit *old_commit, *new_commit;
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if (timestamp < cb->cmd.expire_total)
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return 1;
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old_commit = new_commit = NULL;
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if (cb->cmd.stalefix &&
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(!keep_entry(&old_commit, ooid) || !keep_entry(&new_commit, noid)))
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return 1;
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if (timestamp < cb->cmd.expire_unreachable) {
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switch (cb->unreachable_expire_kind) {
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case UE_ALWAYS:
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return 1;
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case UE_NORMAL:
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case UE_HEAD:
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if (unreachable(cb, old_commit, ooid) || unreachable(cb, new_commit, noid))
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return 1;
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break;
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}
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}
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if (cb->cmd.recno && --(cb->cmd.recno) == 0)
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return 1;
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return 0;
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}
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int should_expire_reflog_ent_verbose(struct object_id *ooid,
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struct object_id *noid,
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const char *email,
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timestamp_t timestamp, int tz,
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const char *message, void *cb_data)
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{
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struct expire_reflog_policy_cb *cb = cb_data;
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int expire;
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expire = should_expire_reflog_ent(ooid, noid, email, timestamp, tz,
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message, cb);
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if (!expire)
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printf("keep %s", message);
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else if (cb->dry_run)
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printf("would prune %s", message);
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else
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printf("prune %s", message);
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return expire;
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}
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static int push_tip_to_list(const char *refname UNUSED,
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const struct object_id *oid,
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int flags, void *cb_data)
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{
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struct commit_list **list = cb_data;
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struct commit *tip_commit;
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if (flags & REF_ISSYMREF)
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return 0;
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tip_commit = lookup_commit_reference_gently(the_repository, oid, 1);
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if (!tip_commit)
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return 0;
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commit_list_insert(tip_commit, list);
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return 0;
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}
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static int is_head(const char *refname)
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{
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const char *stripped_refname;
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parse_worktree_ref(refname, NULL, NULL, &stripped_refname);
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return !strcmp(stripped_refname, "HEAD");
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}
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void reflog_expiry_prepare(const char *refname,
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const struct object_id *oid,
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void *cb_data)
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{
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struct expire_reflog_policy_cb *cb = cb_data;
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struct commit_list *elem;
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struct commit *commit = NULL;
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if (!cb->cmd.expire_unreachable || is_head(refname)) {
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cb->unreachable_expire_kind = UE_HEAD;
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} else {
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commit = lookup_commit(the_repository, oid);
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if (commit && is_null_oid(&commit->object.oid))
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commit = NULL;
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cb->unreachable_expire_kind = commit ? UE_NORMAL : UE_ALWAYS;
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}
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if (cb->cmd.expire_unreachable <= cb->cmd.expire_total)
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cb->unreachable_expire_kind = UE_ALWAYS;
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switch (cb->unreachable_expire_kind) {
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case UE_ALWAYS:
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return;
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case UE_HEAD:
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for_each_ref(push_tip_to_list, &cb->tips);
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for (elem = cb->tips; elem; elem = elem->next)
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commit_list_insert(elem->item, &cb->mark_list);
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break;
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case UE_NORMAL:
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commit_list_insert(commit, &cb->mark_list);
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/* For reflog_expiry_cleanup() below */
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cb->tip_commit = commit;
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}
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cb->mark_limit = cb->cmd.expire_total;
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mark_reachable(cb);
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}
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void reflog_expiry_cleanup(void *cb_data)
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{
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struct expire_reflog_policy_cb *cb = cb_data;
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struct commit_list *elem;
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switch (cb->unreachable_expire_kind) {
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case UE_ALWAYS:
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return;
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case UE_HEAD:
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for (elem = cb->tips; elem; elem = elem->next)
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clear_commit_marks(elem->item, REACHABLE);
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free_commit_list(cb->tips);
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break;
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case UE_NORMAL:
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clear_commit_marks(cb->tip_commit, REACHABLE);
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break;
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}
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for (elem = cb->mark_list; elem; elem = elem->next)
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clear_commit_marks(elem->item, REACHABLE);
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free_commit_list(cb->mark_list);
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}
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int count_reflog_ent(struct object_id *ooid UNUSED,
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struct object_id *noid UNUSED,
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const char *email UNUSED,
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timestamp_t timestamp, int tz UNUSED,
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const char *message UNUSED, void *cb_data)
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{
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struct cmd_reflog_expire_cb *cb = cb_data;
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if (!cb->expire_total || timestamp < cb->expire_total)
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cb->recno++;
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return 0;
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}
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int reflog_delete(const char *rev, enum expire_reflog_flags flags, int verbose)
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{
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struct cmd_reflog_expire_cb cmd = { 0 };
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int status = 0;
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reflog_expiry_should_prune_fn *should_prune_fn = should_expire_reflog_ent;
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const char *spec = strstr(rev, "@{");
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char *ep, *ref;
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int recno;
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struct expire_reflog_policy_cb cb = {
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.dry_run = !!(flags & EXPIRE_REFLOGS_DRY_RUN),
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};
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if (verbose)
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should_prune_fn = should_expire_reflog_ent_verbose;
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if (!spec)
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return error(_("not a reflog: %s"), rev);
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if (!dwim_log(rev, spec - rev, NULL, &ref)) {
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status |= error(_("no reflog for '%s'"), rev);
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goto cleanup;
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}
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recno = strtoul(spec + 2, &ep, 10);
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if (*ep == '}') {
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cmd.recno = -recno;
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for_each_reflog_ent(ref, count_reflog_ent, &cmd);
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} else {
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cmd.expire_total = approxidate(spec + 2);
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for_each_reflog_ent(ref, count_reflog_ent, &cmd);
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cmd.expire_total = 0;
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}
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cb.cmd = cmd;
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status |= reflog_expire(ref, flags,
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reflog_expiry_prepare,
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should_prune_fn,
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reflog_expiry_cleanup,
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&cb);
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cleanup:
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free(ref);
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return status;
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}
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