Blame src/reflog.c

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/*
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 * Copyright (C) the libgit2 contributors. All rights reserved.
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 *
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 * This file is part of libgit2, distributed under the GNU GPL v2 with
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 * a Linking Exception. For full terms see the included COPYING file.
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 */
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#include "reflog.h"
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#include "repository.h"
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#include "filebuf.h"
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#include "signature.h"
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#include "refdb.h"
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#include <git2/sys/refdb_backend.h>
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git_reflog_entry *git_reflog_entry__alloc(void)
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{
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	return git__calloc(1, sizeof(git_reflog_entry));
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}
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void git_reflog_entry__free(git_reflog_entry *entry)
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{
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	git_signature_free(entry->committer);
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	git__free(entry->msg);
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	git__free(entry);
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}
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void git_reflog_free(git_reflog *reflog)
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{
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	size_t i;
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	git_reflog_entry *entry;
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	if (reflog == NULL)
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		return;
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	if (reflog->db)
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		GIT_REFCOUNT_DEC(reflog->db, git_refdb__free);
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	for (i=0; i < reflog->entries.length; i++) {
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		entry = git_vector_get(&reflog->entries, i);
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		git_reflog_entry__free(entry);
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	}
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	git_vector_free(&reflog->entries);
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	git__free(reflog->ref_name);
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	git__free(reflog);
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}
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int git_reflog_read(git_reflog **reflog, git_repository *repo,  const char *name)
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{
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	git_refdb *refdb;
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	int error;
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	assert(reflog && repo && name);
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	if ((error = git_repository_refdb__weakptr(&refdb, repo)) < 0)
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		return error;
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	return git_refdb_reflog_read(reflog, refdb, name);
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}
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int git_reflog_write(git_reflog *reflog)
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{
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	git_refdb *db;
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	assert(reflog && reflog->db);
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	db = reflog->db;
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	return db->backend->reflog_write(db->backend, reflog);
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}
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int git_reflog_append(git_reflog *reflog, const git_oid *new_oid, const git_signature *committer, const char *msg)
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{
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	git_reflog_entry *entry;
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	const git_reflog_entry *previous;
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	const char *newline;
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	assert(reflog && new_oid && committer);
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	entry = git__calloc(1, sizeof(git_reflog_entry));
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	GITERR_CHECK_ALLOC(entry);
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	if ((git_signature_dup(&entry->committer, committer)) < 0)
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		goto cleanup;
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	if (msg != NULL) {
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		if ((entry->msg = git__strdup(msg)) == NULL)
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			goto cleanup;
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		newline = strchr(msg, '\n');
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		if (newline) {
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			if (newline[1] != '\0') {
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				giterr_set(GITERR_INVALID, "reflog message cannot contain newline");
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				goto cleanup;
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			}
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			entry->msg[newline - msg] = '\0';
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		}
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	}
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	previous = git_reflog_entry_byindex(reflog, 0);
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	if (previous == NULL)
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		git_oid_fromstr(&entry->oid_old, GIT_OID_HEX_ZERO);
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	else
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		git_oid_cpy(&entry->oid_old, &previous->oid_cur);
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	git_oid_cpy(&entry->oid_cur, new_oid);
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	if (git_vector_insert(&reflog->entries, entry) < 0)
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		goto cleanup;
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	return 0;
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cleanup:
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	git_reflog_entry__free(entry);
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	return -1;
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}
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int git_reflog_rename(git_repository *repo, const char *old_name, const char *new_name)
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{
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	git_refdb *refdb;
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	int error;
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	if ((error = git_repository_refdb__weakptr(&refdb, repo)) < 0)
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		return -1;
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	return refdb->backend->reflog_rename(refdb->backend, old_name, new_name);
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}
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int git_reflog_delete(git_repository *repo, const char *name)
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{
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	git_refdb *refdb;
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	int error;
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	if ((error = git_repository_refdb__weakptr(&refdb, repo)) < 0)
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		return -1;
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	return refdb->backend->reflog_delete(refdb->backend, name);
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}
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size_t git_reflog_entrycount(git_reflog *reflog)
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{
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	assert(reflog);
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	return reflog->entries.length;
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}
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const git_reflog_entry * git_reflog_entry_byindex(const git_reflog *reflog, size_t idx)
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{
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	assert(reflog);
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	if (idx >= reflog->entries.length)
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		return NULL;
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	return git_vector_get(
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		&reflog->entries, reflog_inverse_index(idx, reflog->entries.length));
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}
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const git_oid * git_reflog_entry_id_old(const git_reflog_entry *entry)
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{
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	assert(entry);
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	return &entry->oid_old;
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}
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const git_oid * git_reflog_entry_id_new(const git_reflog_entry *entry)
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{
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	assert(entry);
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	return &entry->oid_cur;
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}
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const git_signature * git_reflog_entry_committer(const git_reflog_entry *entry)
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{
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	assert(entry);
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	return entry->committer;
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}
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const char * git_reflog_entry_message(const git_reflog_entry *entry)
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{
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	assert(entry);
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	return entry->msg;
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}
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int git_reflog_drop(git_reflog *reflog, size_t idx, int rewrite_previous_entry)
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{
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	size_t entrycount;
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	git_reflog_entry *entry, *previous;
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	entrycount = git_reflog_entrycount(reflog);
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	entry = (git_reflog_entry *)git_reflog_entry_byindex(reflog, idx);
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	if (entry == NULL) {
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		giterr_set(GITERR_REFERENCE, "no reflog entry at index %"PRIuZ, idx);
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		return GIT_ENOTFOUND;
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	}
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	git_reflog_entry__free(entry);
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	if (git_vector_remove(
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			&reflog->entries, reflog_inverse_index(idx, entrycount)) < 0)
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		return -1;
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	if (!rewrite_previous_entry)
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		return 0;
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	/* No need to rewrite anything when removing the most recent entry */
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	if (idx == 0)
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		return 0;
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	/* Have the latest entry just been dropped? */
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	if (entrycount == 1)
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		return 0;
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	entry = (git_reflog_entry *)git_reflog_entry_byindex(reflog, idx - 1);
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	/* If the oldest entry has just been removed... */
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	if (idx == entrycount - 1) {
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		/* ...clear the oid_old member of the "new" oldest entry */
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		if (git_oid_fromstr(&entry->oid_old, GIT_OID_HEX_ZERO) < 0)
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			return -1;
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		return 0;
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	}
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	previous = (git_reflog_entry *)git_reflog_entry_byindex(reflog, idx);
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	git_oid_cpy(&entry->oid_old, &previous->oid_cur);
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	return 0;
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}