thodg/libgit2/src/reflog.c

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• Hash : 80212ecb
  Author :
  Date : 2012-11-12T16:49:29
  

  reflog: Deploy EINVALIDSPEC usage

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• src/reflog.c

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "reflog.h"
  #include "repository.h"
  #include "filebuf.h"
  #include "signature.h"
  
  static int reflog_init(git_reflog **reflog, const git_reference *ref)
  {
  	git_reflog *log;
  
  	*reflog = NULL;
  
  	log = git__calloc(1, sizeof(git_reflog));
  	GITERR_CHECK_ALLOC(log);
  
  	log->ref_name = git__strdup(ref->name);
  	GITERR_CHECK_ALLOC(log->ref_name);
  
  	if (git_vector_init(&log->entries, 0, NULL) < 0) {
  		git__free(log->ref_name);
  		git__free(log);
  		return -1;
  	}
  
  	log->owner = git_reference_owner(ref);
  	*reflog = log;
  
  	return 0;
  }
  
  static int serialize_reflog_entry(
  	git_buf *buf,
  	const git_oid *oid_old,
  	const git_oid *oid_new,
  	const git_signature *committer,
  	const char *msg)
  {
  	char raw_old[GIT_OID_HEXSZ+1];
  	char raw_new[GIT_OID_HEXSZ+1];
  
  	git_oid_tostr(raw_old, GIT_OID_HEXSZ+1, oid_old);
  	git_oid_tostr(raw_new, GIT_OID_HEXSZ+1, oid_new);
  
  	git_buf_clear(buf);
  
  	git_buf_puts(buf, raw_old);
  	git_buf_putc(buf, ' ');
  	git_buf_puts(buf, raw_new);
  
  	git_signature__writebuf(buf, " ", committer);
  
  	/* drop trailing LF */
  	git_buf_rtrim(buf);
  
  	if (msg) {
  		git_buf_putc(buf, '\t');
  		git_buf_puts(buf, msg);
  	}
  
  	git_buf_putc(buf, '\n');
  
  	return git_buf_oom(buf);
  }
  
  static int reflog_entry_new(git_reflog_entry **entry)
  {
  	git_reflog_entry *e;
  
  	assert(entry);
  
  	e = git__malloc(sizeof(git_reflog_entry));
  	GITERR_CHECK_ALLOC(e);
  
  	memset(e, 0, sizeof(git_reflog_entry));
  
  	*entry = e;
  
  	return 0;
  }
  
  static void reflog_entry_free(git_reflog_entry *entry)
  {
  	git_signature_free(entry->committer);
  
  	git__free(entry->msg);
  	git__free(entry);
  }
  
  static int reflog_parse(git_reflog *log, const char *buf, size_t buf_size)
  {
  	const char *ptr;
  	git_reflog_entry *entry;
  
  #define seek_forward(_increase) do { \
  	if (_increase >= buf_size) { \
  		giterr_set(GITERR_INVALID, "Ran out of data while parsing reflog"); \
  		goto fail; \
  	} \
  	buf += _increase; \
  	buf_size -= _increase; \
  	} while (0)
  
  	while (buf_size > GIT_REFLOG_SIZE_MIN) {
  		if (reflog_entry_new(&entry) < 0)
  			return -1;
  
  		entry->committer = git__malloc(sizeof(git_signature));
  		GITERR_CHECK_ALLOC(entry->committer);
  
  		if (git_oid_fromstrn(&entry->oid_old, buf, GIT_OID_HEXSZ) < 0)
  			goto fail;
  		seek_forward(GIT_OID_HEXSZ + 1);
  
  		if (git_oid_fromstrn(&entry->oid_cur, buf, GIT_OID_HEXSZ) < 0)
  			goto fail;
  		seek_forward(GIT_OID_HEXSZ + 1);
  
  		ptr = buf;
  
  		/* Seek forward to the end of the signature. */
  		while (*buf && *buf != '\t' && *buf != '\n')
  			seek_forward(1);
  
  		if (git_signature__parse(entry->committer, &ptr, buf + 1, NULL, *buf) < 0)
  			goto fail;
  
  		if (*buf == '\t') {
  			/* We got a message. Read everything till we reach LF. */
  			seek_forward(1);
  			ptr = buf;
  
  			while (*buf && *buf != '\n')
  				seek_forward(1);
  
  			entry->msg = git__strndup(ptr, buf - ptr);
  			GITERR_CHECK_ALLOC(entry->msg);
  		} else
  			entry->msg = NULL;
  
  		while (*buf && *buf == '\n' && buf_size > 1)
  			seek_forward(1);
  
  		if (git_vector_insert(&log->entries, entry) < 0)
  			goto fail;
  	}
  
  	return 0;
  
  #undef seek_forward
  
  fail:
  	if (entry)
  		reflog_entry_free(entry);
  
  	return -1;
  }
  
  void git_reflog_free(git_reflog *reflog)
  {
  	unsigned int i;
  	git_reflog_entry *entry;
  
  	if (reflog == NULL)
  		return;
  
  	for (i=0; i < reflog->entries.length; i++) {
  		entry = git_vector_get(&reflog->entries, i);
  
  		reflog_entry_free(entry);
  	}
  
  	git_vector_free(&reflog->entries);
  	git__free(reflog->ref_name);
  	git__free(reflog);
  }
  
  static int retrieve_reflog_path(git_buf *path, const git_reference *ref)
  {
  	return git_buf_join_n(path, '/', 3,
  		git_reference_owner(ref)->path_repository, GIT_REFLOG_DIR, ref->name);
  }
  
  static int create_new_reflog_file(const char *filepath)
  {
  	int fd, error;
  
  	if ((error = git_futils_mkpath2file(filepath, GIT_REFLOG_DIR_MODE)) < 0)
  		return error;
  
  	if ((fd = p_open(filepath,
  			O_WRONLY | O_CREAT | O_TRUNC,
  			GIT_REFLOG_FILE_MODE)) < 0)
  		return -1;
  
  	return p_close(fd);
  }
  
  int git_reflog_read(git_reflog **reflog, const git_reference *ref)
  {
  	int error = -1;
  	git_buf log_path = GIT_BUF_INIT;
  	git_buf log_file = GIT_BUF_INIT;
  	git_reflog *log = NULL;
  
  	*reflog = NULL;
  
  	assert(reflog && ref);
  
  	if (reflog_init(&log, ref) < 0)
  		return -1;
  
  	if (retrieve_reflog_path(&log_path, ref) < 0)
  		goto cleanup;
  
  	error = git_futils_readbuffer(&log_file, git_buf_cstr(&log_path));
  	if (error < 0 && error != GIT_ENOTFOUND)
  		goto cleanup;
  
  	if ((error == GIT_ENOTFOUND) &&
  		((error = create_new_reflog_file(git_buf_cstr(&log_path))) < 0))
  		goto cleanup;
  
  	if ((error = reflog_parse(log,
  		git_buf_cstr(&log_file), git_buf_len(&log_file))) < 0)
  		goto cleanup;
  
  	*reflog = log;
  	goto success;
  
  cleanup:
  	git_reflog_free(log);
  
  success:
  	git_buf_free(&log_file);
  	git_buf_free(&log_path);
  
  	return error;
  }
  
  int git_reflog_write(git_reflog *reflog)
  {
  	int error = -1;
  	unsigned int i;
  	git_reflog_entry *entry;
  	git_buf log_path = GIT_BUF_INIT;
  	git_buf log = GIT_BUF_INIT;
  	git_filebuf fbuf = GIT_FILEBUF_INIT;
  
  	assert(reflog);
  
  
  	if (git_buf_join_n(&log_path, '/', 3,
  		git_repository_path(reflog->owner), GIT_REFLOG_DIR, reflog->ref_name) < 0)
  		return -1;
  
  	if (!git_path_isfile(git_buf_cstr(&log_path))) {
  		giterr_set(GITERR_INVALID,
  			"Log file for reference '%s' doesn't exist.", reflog->ref_name);
  		goto cleanup;
  	}
  
  	if ((error = git_filebuf_open(&fbuf, git_buf_cstr(&log_path), 0)) < 0)
  		goto cleanup;
  
  	git_vector_foreach(&reflog->entries, i, entry) {
  		if (serialize_reflog_entry(&log, &(entry->oid_old), &(entry->oid_cur), entry->committer, entry->msg) < 0)
  			goto cleanup;
  
  		if ((error = git_filebuf_write(&fbuf, log.ptr, log.size)) < 0)
  			goto cleanup;
  	}
  
  	error = git_filebuf_commit(&fbuf, GIT_REFLOG_FILE_MODE);
  	goto success;
  
  cleanup:
  	git_filebuf_cleanup(&fbuf);
  
  success:
  	git_buf_free(&log);
  	git_buf_free(&log_path);
  	return error;
  }
  
  int git_reflog_append(git_reflog *reflog, const git_oid *new_oid,
  				const git_signature *committer, const char *msg)
  {
  	git_reflog_entry *entry;
  	const git_reflog_entry *previous;
  	const char *newline;
  
  	assert(reflog && new_oid && committer);
  
  	if (reflog_entry_new(&entry) < 0)
  		return -1;
  
  	if ((entry->committer = git_signature_dup(committer)) == NULL)
  		goto cleanup;
  
  	if (msg != NULL) {
  		if ((entry->msg = git__strdup(msg)) == NULL)
  			goto cleanup;
  
  		newline = strchr(msg, '\n');
  
  		if (newline) {
  			if (newline[1] != '\0') {
  				giterr_set(GITERR_INVALID, "Reflog message cannot contain newline");
  				goto cleanup;
  			}
  
  			entry->msg[newline - msg] = '\0';
  		}
  	}
  
  	previous = git_reflog_entry_byindex(reflog, 0);
  
  	if (previous == NULL)
  		git_oid_fromstr(&entry->oid_old, GIT_OID_HEX_ZERO);
  	else
  		git_oid_cpy(&entry->oid_old, &previous->oid_cur);
  
  	git_oid_cpy(&entry->oid_cur, new_oid);
  
  	if (git_vector_insert(&reflog->entries, entry) < 0)
  		goto cleanup;
  
  	return 0;
  
  cleanup:
  	reflog_entry_free(entry);
  	return -1;
  }
  
  int git_reflog_rename(git_reference *ref, const char *new_name)
  {
  	int error, fd;
  	git_buf old_path = GIT_BUF_INIT;
  	git_buf new_path = GIT_BUF_INIT;
  	git_buf temp_path = GIT_BUF_INIT;
  	git_buf normalized = GIT_BUF_INIT;
  
  	assert(ref && new_name);
  
  	if ((error = git_reference__normalize_name(
  		&normalized, new_name, GIT_REF_FORMAT_ALLOW_ONELEVEL)) < 0)
  			goto cleanup;
  
  	error = -1;
  
  	if (git_buf_joinpath(&temp_path, git_reference_owner(ref)->path_repository, GIT_REFLOG_DIR) < 0)
  		return -1;
  
  	if (git_buf_joinpath(&old_path, git_buf_cstr(&temp_path), ref->name) < 0)
  		goto cleanup;
  
  	if (git_buf_joinpath(&new_path,
  		git_buf_cstr(&temp_path), git_buf_cstr(&normalized)) < 0)
  			goto cleanup;
  
  	/*
  	 * Move the reflog to a temporary place. This two-phase renaming is required
  	 * in order to cope with funny renaming use cases when one tries to move a reference
  	 * to a partially colliding namespace:
  	 *  - a/b -> a/b/c
  	 *  - a/b/c/d -> a/b/c
  	 */
  	if (git_buf_joinpath(&temp_path, git_buf_cstr(&temp_path), "temp_reflog") < 0)
  		goto cleanup;
  
  	if ((fd = git_futils_mktmp(&temp_path, git_buf_cstr(&temp_path))) < 0)
  		goto cleanup;
  	p_close(fd);
  
  	if (p_rename(git_buf_cstr(&old_path), git_buf_cstr(&temp_path)) < 0)
  		goto cleanup;
  
  	if (git_path_isdir(git_buf_cstr(&new_path)) && 
  		(git_futils_rmdir_r(git_buf_cstr(&new_path), NULL, GIT_RMDIR_SKIP_NONEMPTY) < 0))
  		goto cleanup;
  
  	if (git_futils_mkpath2file(git_buf_cstr(&new_path), GIT_REFLOG_DIR_MODE) < 0)
  		goto cleanup;
  
  	error = p_rename(git_buf_cstr(&temp_path), git_buf_cstr(&new_path));
  
  cleanup:
  	git_buf_free(&temp_path);
  	git_buf_free(&old_path);
  	git_buf_free(&new_path);
  	git_buf_free(&normalized);
  
  	return error;
  }
  
  int git_reflog_delete(git_reference *ref)
  {
  	int error;
  	git_buf path = GIT_BUF_INIT;
  
  	error = retrieve_reflog_path(&path, ref);
  
  	if (!error && git_path_exists(path.ptr))
  		error = p_unlink(path.ptr);
  
  	git_buf_free(&path);
  
  	return error;
  }
  
  size_t git_reflog_entrycount(git_reflog *reflog)
  {
  	assert(reflog);
  	return reflog->entries.length;
  }
  
  GIT_INLINE(size_t) reflog_inverse_index(size_t idx, size_t total)
  {
  	return (total - 1) - idx;
  }
  
  const git_reflog_entry * git_reflog_entry_byindex(git_reflog *reflog, size_t idx)
  {
  	assert(reflog);
  
  	if (idx >= reflog->entries.length)
  		return NULL;
  
  	return git_vector_get(
  		&reflog->entries, reflog_inverse_index(idx, reflog->entries.length));
  }
  
  const git_oid * git_reflog_entry_id_old(const git_reflog_entry *entry)
  {
  	assert(entry);
  	return &entry->oid_old;
  }
  
  const git_oid * git_reflog_entry_id_new(const git_reflog_entry *entry)
  {
  	assert(entry);
  	return &entry->oid_cur;
  }
  
  const git_signature * git_reflog_entry_committer(const git_reflog_entry *entry)
  {
  	assert(entry);
  	return entry->committer;
  }
  
  const char * git_reflog_entry_message(const git_reflog_entry *entry)
  {
  	assert(entry);
  	return entry->msg;
  }
  
  int git_reflog_drop(
  	git_reflog *reflog,
  	size_t idx,
  	int rewrite_previous_entry)
  {
  	size_t entrycount;
  	git_reflog_entry *entry, *previous;
  
  	assert(reflog);
  
  	entrycount = git_reflog_entrycount(reflog);
  
  	entry = (git_reflog_entry *)git_reflog_entry_byindex(reflog, idx);
  
  	if (entry == NULL)
  		return GIT_ENOTFOUND;
  
  	reflog_entry_free(entry);
  
  	if (git_vector_remove(
  			&reflog->entries, reflog_inverse_index(idx, entrycount)) < 0)
  		return -1;
  
  	if (!rewrite_previous_entry)
  		return 0;
  
  	/* No need to rewrite anything when removing the most recent entry */
  	if (idx == 0)
  		return 0;
  
  	/* Have the latest entry just been dropped? */
  	if (entrycount == 1)
  		return 0;
  
  	entry = (git_reflog_entry *)git_reflog_entry_byindex(reflog, idx - 1);
  
  	/* If the oldest entry has just been removed... */
  	if (idx == entrycount - 1) {
  		/* ...clear the oid_old member of the "new" oldest entry */
  		if (git_oid_fromstr(&entry->oid_old, GIT_OID_HEX_ZERO) < 0)
  			return -1;
  
  		return 0;
  	}
  
  	previous = (git_reflog_entry *)git_reflog_entry_byindex(reflog, idx);
  	git_oid_cpy(&entry->oid_old, &previous->oid_cur);
  
  	return 0;
  }
  

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