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652 lines
16 KiB
652 lines
16 KiB
#include "cache.h" |
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#include "builtin.h" |
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#include "commit.h" |
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#include "refs.h" |
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#include "dir.h" |
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#include "tree-walk.h" |
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#include "diff.h" |
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#include "revision.h" |
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#include "reachable.h" |
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|
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/* |
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* reflog expire |
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*/ |
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|
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static const char reflog_expire_usage[] = |
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"git-reflog (show|expire) [--verbose] [--dry-run] [--stale-fix] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>..."; |
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static const char reflog_delete_usage[] = |
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"git-reflog delete [--verbose] [--dry-run] [--rewrite] [--updateref] <refs>..."; |
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|
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static unsigned long default_reflog_expire; |
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static unsigned long default_reflog_expire_unreachable; |
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|
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struct cmd_reflog_expire_cb { |
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struct rev_info revs; |
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int dry_run; |
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int stalefix; |
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int rewrite; |
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int updateref; |
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int verbose; |
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unsigned long expire_total; |
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unsigned long expire_unreachable; |
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int recno; |
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}; |
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|
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struct expire_reflog_cb { |
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FILE *newlog; |
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const char *ref; |
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struct commit *ref_commit; |
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struct cmd_reflog_expire_cb *cmd; |
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unsigned char last_kept_sha1[20]; |
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}; |
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|
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struct collected_reflog { |
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unsigned char sha1[20]; |
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char reflog[FLEX_ARRAY]; |
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}; |
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struct collect_reflog_cb { |
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struct collected_reflog **e; |
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int alloc; |
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int nr; |
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}; |
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|
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#define INCOMPLETE (1u<<10) |
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#define STUDYING (1u<<11) |
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|
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static int tree_is_complete(const unsigned char *sha1) |
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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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|
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tree = lookup_tree(sha1); |
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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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|
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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 = read_sha1_file(sha1, &type, &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->buffer, tree->size); |
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complete = 1; |
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while (tree_entry(&desc, &entry)) { |
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if (!has_sha1_file(entry.sha1) || |
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(S_ISDIR(entry.mode) && !tree_is_complete(entry.sha1))) { |
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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); |
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tree->buffer = NULL; |
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|
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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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|
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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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|
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c = (struct commit *)study.objects[--study.nr].item; |
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if (!c->object.parsed && !parse_object(c->object.sha1)) |
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c->object.flags |= INCOMPLETE; |
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|
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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(c->tree->object.sha1)) { |
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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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free(study.objects); |
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free(found.objects); |
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return !is_incomplete; |
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} |
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static int keep_entry(struct commit **it, unsigned char *sha1) |
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{ |
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struct commit *commit; |
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|
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if (is_null_sha1(sha1)) |
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return 1; |
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commit = lookup_commit_reference_gently(sha1, 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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static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1, |
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const char *email, unsigned long timestamp, int tz, |
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const char *message, void *cb_data) |
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{ |
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struct expire_reflog_cb *cb = cb_data; |
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struct commit *old, *new; |
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|
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if (timestamp < cb->cmd->expire_total) |
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goto prune; |
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if (cb->cmd->rewrite) |
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osha1 = cb->last_kept_sha1; |
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|
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old = new = NULL; |
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if (cb->cmd->stalefix && |
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(!keep_entry(&old, osha1) || !keep_entry(&new, nsha1))) |
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goto prune; |
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if (timestamp < cb->cmd->expire_unreachable) { |
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if (!cb->ref_commit) |
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goto prune; |
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if (!old && !is_null_sha1(osha1)) |
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old = lookup_commit_reference_gently(osha1, 1); |
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if (!new && !is_null_sha1(nsha1)) |
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new = lookup_commit_reference_gently(nsha1, 1); |
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if ((old && !in_merge_bases(old, &cb->ref_commit, 1)) || |
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(new && !in_merge_bases(new, &cb->ref_commit, 1))) |
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goto prune; |
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} |
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if (cb->cmd->recno && --(cb->cmd->recno) == 0) |
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goto prune; |
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if (cb->newlog) { |
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char sign = (tz < 0) ? '-' : '+'; |
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int zone = (tz < 0) ? (-tz) : tz; |
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fprintf(cb->newlog, "%s %s %s %lu %c%04d\t%s", |
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sha1_to_hex(osha1), sha1_to_hex(nsha1), |
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email, timestamp, sign, zone, |
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message); |
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hashcpy(cb->last_kept_sha1, nsha1); |
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} |
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if (cb->cmd->verbose) |
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printf("keep %s", message); |
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return 0; |
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prune: |
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if (!cb->newlog || cb->cmd->verbose) |
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printf("%sprune %s", cb->newlog ? "" : "would ", message); |
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return 0; |
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} |
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static int expire_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data) |
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{ |
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struct cmd_reflog_expire_cb *cmd = cb_data; |
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struct expire_reflog_cb cb; |
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struct ref_lock *lock; |
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char *log_file, *newlog_path = NULL; |
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int status = 0; |
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memset(&cb, 0, sizeof(cb)); |
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/* |
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* we take the lock for the ref itself to prevent it from |
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* getting updated. |
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*/ |
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lock = lock_any_ref_for_update(ref, sha1, 0); |
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if (!lock) |
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return error("cannot lock ref '%s'", ref); |
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log_file = xstrdup(git_path("logs/%s", ref)); |
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if (!file_exists(log_file)) |
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goto finish; |
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if (!cmd->dry_run) { |
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newlog_path = xstrdup(git_path("logs/%s.lock", ref)); |
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cb.newlog = fopen(newlog_path, "w"); |
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} |
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cb.ref_commit = lookup_commit_reference_gently(sha1, 1); |
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cb.ref = ref; |
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cb.cmd = cmd; |
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for_each_reflog_ent(ref, expire_reflog_ent, &cb); |
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finish: |
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if (cb.newlog) { |
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if (fclose(cb.newlog)) { |
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status |= error("%s: %s", strerror(errno), |
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newlog_path); |
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unlink(newlog_path); |
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} else if (cmd->updateref && |
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(write_in_full(lock->lock_fd, |
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sha1_to_hex(cb.last_kept_sha1), 40) != 40 || |
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write_in_full(lock->lock_fd, "\n", 1) != 1 || |
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close_ref(lock) < 0)) { |
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status |= error("Couldn't write %s", |
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lock->lk->filename); |
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unlink(newlog_path); |
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} else if (rename(newlog_path, log_file)) { |
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status |= error("cannot rename %s to %s", |
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newlog_path, log_file); |
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unlink(newlog_path); |
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} else if (cmd->updateref && commit_ref(lock)) { |
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status |= error("Couldn't set %s", lock->ref_name); |
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} else { |
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adjust_shared_perm(log_file); |
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} |
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} |
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free(newlog_path); |
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free(log_file); |
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unlock_ref(lock); |
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return status; |
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} |
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static int collect_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data) |
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{ |
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struct collected_reflog *e; |
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struct collect_reflog_cb *cb = cb_data; |
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size_t namelen = strlen(ref); |
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e = xmalloc(sizeof(*e) + namelen + 1); |
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hashcpy(e->sha1, sha1); |
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memcpy(e->reflog, ref, namelen + 1); |
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ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc); |
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cb->e[cb->nr++] = e; |
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return 0; |
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} |
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static struct reflog_expire_cfg { |
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struct reflog_expire_cfg *next; |
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unsigned long expire_total; |
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unsigned long expire_unreachable; |
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size_t len; |
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char pattern[FLEX_ARRAY]; |
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} *reflog_expire_cfg, **reflog_expire_cfg_tail; |
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|
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static struct reflog_expire_cfg *find_cfg_ent(const char *pattern, size_t len) |
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{ |
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struct reflog_expire_cfg *ent; |
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if (!reflog_expire_cfg_tail) |
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reflog_expire_cfg_tail = &reflog_expire_cfg; |
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for (ent = reflog_expire_cfg; ent; ent = ent->next) |
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if (ent->len == len && |
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!memcmp(ent->pattern, pattern, len)) |
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return ent; |
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ent = xcalloc(1, (sizeof(*ent) + len)); |
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memcpy(ent->pattern, pattern, len); |
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ent->len = len; |
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*reflog_expire_cfg_tail = ent; |
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reflog_expire_cfg_tail = &(ent->next); |
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return ent; |
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} |
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|
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static int parse_expire_cfg_value(const char *var, const char *value, unsigned long *expire) |
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{ |
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if (!value) |
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return config_error_nonbool(var); |
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if (!strcmp(value, "never") || !strcmp(value, "false")) { |
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*expire = 0; |
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return 0; |
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} |
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*expire = approxidate(value); |
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return 0; |
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} |
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|
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/* expiry timer slot */ |
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#define EXPIRE_TOTAL 01 |
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#define EXPIRE_UNREACH 02 |
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static int reflog_expire_config(const char *var, const char *value, void *cb) |
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{ |
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const char *lastdot = strrchr(var, '.'); |
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unsigned long expire; |
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int slot; |
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struct reflog_expire_cfg *ent; |
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|
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if (!lastdot || prefixcmp(var, "gc.")) |
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return git_default_config(var, value, cb); |
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if (!strcmp(lastdot, ".reflogexpire")) { |
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slot = EXPIRE_TOTAL; |
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if (parse_expire_cfg_value(var, value, &expire)) |
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return -1; |
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} else if (!strcmp(lastdot, ".reflogexpireunreachable")) { |
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slot = EXPIRE_UNREACH; |
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if (parse_expire_cfg_value(var, value, &expire)) |
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return -1; |
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} else |
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return git_default_config(var, value, cb); |
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if (lastdot == var + 2) { |
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switch (slot) { |
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case EXPIRE_TOTAL: |
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default_reflog_expire = expire; |
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break; |
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case EXPIRE_UNREACH: |
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default_reflog_expire_unreachable = expire; |
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break; |
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} |
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return 0; |
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} |
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ent = find_cfg_ent(var + 3, lastdot - (var+3)); |
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if (!ent) |
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return -1; |
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switch (slot) { |
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case EXPIRE_TOTAL: |
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ent->expire_total = expire; |
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break; |
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case EXPIRE_UNREACH: |
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ent->expire_unreachable = expire; |
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break; |
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} |
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return 0; |
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} |
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static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, const char *ref) |
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{ |
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struct reflog_expire_cfg *ent; |
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if (slot == (EXPIRE_TOTAL|EXPIRE_UNREACH)) |
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return; /* both given explicitly -- nothing to tweak */ |
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for (ent = reflog_expire_cfg; ent; ent = ent->next) { |
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if (!fnmatch(ent->pattern, ref, 0)) { |
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if (!(slot & EXPIRE_TOTAL)) |
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cb->expire_total = ent->expire_total; |
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if (!(slot & EXPIRE_UNREACH)) |
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cb->expire_unreachable = ent->expire_unreachable; |
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return; |
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} |
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} |
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/* |
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* If unconfigured, make stash never expire |
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*/ |
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if (!strcmp(ref, "refs/stash")) { |
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if (!(slot & EXPIRE_TOTAL)) |
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cb->expire_total = 0; |
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if (!(slot & EXPIRE_UNREACH)) |
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cb->expire_unreachable = 0; |
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return; |
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} |
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/* Nothing matched -- use the default value */ |
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if (!(slot & EXPIRE_TOTAL)) |
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cb->expire_total = default_reflog_expire; |
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if (!(slot & EXPIRE_UNREACH)) |
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cb->expire_unreachable = default_reflog_expire_unreachable; |
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} |
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static int cmd_reflog_expire(int argc, const char **argv, const char *prefix) |
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{ |
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struct cmd_reflog_expire_cb cb; |
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unsigned long now = time(NULL); |
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int i, status, do_all; |
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int explicit_expiry = 0; |
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|
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git_config(reflog_expire_config, NULL); |
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|
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save_commit_buffer = 0; |
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do_all = status = 0; |
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memset(&cb, 0, sizeof(cb)); |
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|
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if (!default_reflog_expire_unreachable) |
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default_reflog_expire_unreachable = now - 30 * 24 * 3600; |
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if (!default_reflog_expire) |
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default_reflog_expire = now - 90 * 24 * 3600; |
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cb.expire_total = default_reflog_expire; |
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cb.expire_unreachable = default_reflog_expire_unreachable; |
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|
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for (i = 1; i < argc; i++) { |
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const char *arg = argv[i]; |
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if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n")) |
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cb.dry_run = 1; |
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else if (!prefixcmp(arg, "--expire=")) { |
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cb.expire_total = approxidate(arg + 9); |
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explicit_expiry |= EXPIRE_TOTAL; |
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} |
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else if (!prefixcmp(arg, "--expire-unreachable=")) { |
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cb.expire_unreachable = approxidate(arg + 21); |
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explicit_expiry |= EXPIRE_UNREACH; |
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} |
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else if (!strcmp(arg, "--stale-fix")) |
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cb.stalefix = 1; |
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else if (!strcmp(arg, "--rewrite")) |
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cb.rewrite = 1; |
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else if (!strcmp(arg, "--updateref")) |
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cb.updateref = 1; |
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else if (!strcmp(arg, "--all")) |
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do_all = 1; |
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else if (!strcmp(arg, "--verbose")) |
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cb.verbose = 1; |
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else if (!strcmp(arg, "--")) { |
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i++; |
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break; |
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} |
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else if (arg[0] == '-') |
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usage(reflog_expire_usage); |
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else |
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break; |
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} |
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|
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/* |
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* We can trust the commits and objects reachable from refs |
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* even in older repository. We cannot trust what's reachable |
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* from reflog if the repository was pruned with older git. |
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*/ |
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if (cb.stalefix) { |
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init_revisions(&cb.revs, prefix); |
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if (cb.verbose) |
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printf("Marking reachable objects..."); |
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mark_reachable_objects(&cb.revs, 0); |
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if (cb.verbose) |
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putchar('\n'); |
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} |
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|
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if (do_all) { |
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struct collect_reflog_cb collected; |
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int i; |
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|
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memset(&collected, 0, sizeof(collected)); |
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for_each_reflog(collect_reflog, &collected); |
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for (i = 0; i < collected.nr; i++) { |
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struct collected_reflog *e = collected.e[i]; |
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set_reflog_expiry_param(&cb, explicit_expiry, e->reflog); |
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status |= expire_reflog(e->reflog, e->sha1, 0, &cb); |
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free(e); |
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} |
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free(collected.e); |
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} |
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|
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while (i < argc) { |
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const char *ref = argv[i++]; |
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unsigned char sha1[20]; |
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if (!resolve_ref(ref, sha1, 1, NULL)) { |
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status |= error("%s points nowhere!", ref); |
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continue; |
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} |
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set_reflog_expiry_param(&cb, explicit_expiry, ref); |
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status |= expire_reflog(ref, sha1, 0, &cb); |
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} |
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return status; |
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} |
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|
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static int count_reflog_ent(unsigned char *osha1, unsigned char *nsha1, |
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const char *email, unsigned long timestamp, int tz, |
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const char *message, 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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|
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static int cmd_reflog_delete(int argc, const char **argv, const char *prefix) |
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{ |
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struct cmd_reflog_expire_cb cb; |
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int i, status = 0; |
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|
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memset(&cb, 0, sizeof(cb)); |
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|
|
for (i = 1; i < argc; i++) { |
|
const char *arg = argv[i]; |
|
if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n")) |
|
cb.dry_run = 1; |
|
else if (!strcmp(arg, "--rewrite")) |
|
cb.rewrite = 1; |
|
else if (!strcmp(arg, "--updateref")) |
|
cb.updateref = 1; |
|
else if (!strcmp(arg, "--verbose")) |
|
cb.verbose = 1; |
|
else if (!strcmp(arg, "--")) { |
|
i++; |
|
break; |
|
} |
|
else if (arg[0] == '-') |
|
usage(reflog_delete_usage); |
|
else |
|
break; |
|
} |
|
|
|
if (argc - i < 1) |
|
return error("Nothing to delete?"); |
|
|
|
for ( ; i < argc; i++) { |
|
const char *spec = strstr(argv[i], "@{"); |
|
unsigned char sha1[20]; |
|
char *ep, *ref; |
|
int recno; |
|
|
|
if (!spec) { |
|
status |= error("Not a reflog: %s", argv[i]); |
|
continue; |
|
} |
|
|
|
if (!dwim_ref(argv[i], spec - argv[i], sha1, &ref)) { |
|
status |= error("%s points nowhere!", argv[i]); |
|
continue; |
|
} |
|
|
|
recno = strtoul(spec + 2, &ep, 10); |
|
if (*ep == '}') { |
|
cb.recno = -recno; |
|
for_each_reflog_ent(ref, count_reflog_ent, &cb); |
|
} else { |
|
cb.expire_total = approxidate(spec + 2); |
|
for_each_reflog_ent(ref, count_reflog_ent, &cb); |
|
cb.expire_total = 0; |
|
} |
|
|
|
status |= expire_reflog(ref, sha1, 0, &cb); |
|
free(ref); |
|
} |
|
return status; |
|
} |
|
|
|
/* |
|
* main "reflog" |
|
*/ |
|
|
|
static const char reflog_usage[] = |
|
"git-reflog (expire | ...)"; |
|
|
|
int cmd_reflog(int argc, const char **argv, const char *prefix) |
|
{ |
|
/* With no command, we default to showing it. */ |
|
if (argc < 2 || *argv[1] == '-') |
|
return cmd_log_reflog(argc, argv, prefix); |
|
|
|
if (!strcmp(argv[1], "show")) |
|
return cmd_log_reflog(argc - 1, argv + 1, prefix); |
|
|
|
if (!strcmp(argv[1], "expire")) |
|
return cmd_reflog_expire(argc - 1, argv + 1, prefix); |
|
|
|
if (!strcmp(argv[1], "delete")) |
|
return cmd_reflog_delete(argc - 1, argv + 1, prefix); |
|
|
|
/* Not a recognized reflog command..*/ |
|
usage(reflog_usage); |
|
}
|
|
|