thodg/libgit2/src/reflog.c

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• Hash : 97769280
  Author :
  Date : 2011-11-30T11:27:15
  

  Use git_buf for path storage instead of stack-based buffers This converts virtually all of the places that allocate GIT_PATH_MAX buffers on the stack for manipulating paths to use git_buf objects instead. The patch is pretty careful not to touch the public API for libgit2, so there are a few places that still use GIT_PATH_MAX. This extends and changes some details of the git_buf implementation to add a couple of extra functions and to make error handling easier. This includes serious alterations to all the path.c functions, and several of the fileops.c ones, too. Also, there are a number of new functions that parallel existing ones except that use a git_buf instead of a stack-based buffer (such as git_config_find_global_r that exists alongsize git_config_find_global). This also modifies the win32 version of p_realpath to allocate whatever buffer size is needed to accommodate the realpath instead of hardcoding a GIT_PATH_MAX limit, but that change needs to be tested still.

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• src/reflog.c

• /*
   * Copyright (C) 2009-2011 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, git_reference *ref)
  {
  	git_reflog *log;
  
  	*reflog = NULL;
  
  	log = git__malloc(sizeof(git_reflog));
  	if (log == NULL)
  		return GIT_ENOMEM;
  
  	memset(log, 0x0, sizeof(git_reflog));
  
  	log->ref_name = git__strdup(ref->name);
  
  	if (git_vector_init(&log->entries, 0, NULL) < 0) {
  		git__free(log->ref_name);
  		git__free(log);
  		return GIT_ENOMEM;
  	}
  
  	*reflog = log;
  
  	return GIT_SUCCESS;
  }
  
  static int reflog_write(const char *log_path, const char *oid_old,
  			const char *oid_new, const git_signature *committer,
  			const char *msg)
  {
  	int error;
  	git_buf log = GIT_BUF_INIT;
  	git_filebuf fbuf = GIT_FILEBUF_INIT;
  
  	assert(log_path && oid_old && oid_new && committer);
  
  	git_buf_puts(&log, oid_old);
  	git_buf_putc(&log, ' ');
  
  	git_buf_puts(&log, oid_new);
  
  	git_signature__writebuf(&log, " ", committer);
  	git_buf_truncate(&log, log.size - 1); /* drop LF */
  
  	if (msg) {
  		if (strchr(msg, '\n')) {
  			git_buf_free(&log);
  			return git__throw(GIT_ERROR, "Reflog message cannot contain newline");
  		}
  
  		git_buf_putc(&log, '\t');
  		git_buf_puts(&log, msg);
  	}
  
  	git_buf_putc(&log, '\n');
  
  	if ((error = git_buf_lasterror(&log)) < GIT_SUCCESS) {
  		git_buf_free(&log);
  		return git__rethrow(error, "Failed to write reflog. Memory allocation failure");
  	}
  
  	if ((error = git_filebuf_open(&fbuf, log_path, GIT_FILEBUF_APPEND)) < GIT_SUCCESS) {
  		git_buf_free(&log);
  		return git__rethrow(error, "Failed to write reflog. Cannot open reflog `%s`", log_path);
  	}
  
  	git_filebuf_write(&fbuf, log.ptr, log.size);
  	error = git_filebuf_commit(&fbuf, GIT_REFLOG_FILE_MODE);
  
  	git_buf_free(&log);
  
  	return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to write reflog");
  }
  
  static int reflog_parse(git_reflog *log, const char *buf, size_t buf_size)
  {
  	int error = GIT_SUCCESS;
  	const char *ptr;
  	git_reflog_entry *entry;
  
  #define seek_forward(_increase) { \
  	if (_increase >= buf_size) { \
  		if (entry->committer) \
  			git__free(entry->committer); \
  		git__free(entry); \
  		return git__throw(GIT_ERROR, "Failed to seek forward. Buffer size exceeded"); \
  	} \
  	buf += _increase; \
  	buf_size -= _increase; \
  }
  
  	while (buf_size > GIT_REFLOG_SIZE_MIN) {
  		entry = git__malloc(sizeof(git_reflog_entry));
  		if (entry == NULL)
  			return GIT_ENOMEM;
  		entry->committer = NULL;
  
  		if (git_oid_fromstrn(&entry->oid_old, buf, GIT_OID_HEXSZ) < GIT_SUCCESS) {
  			git__free(entry);
  			return GIT_ERROR;
  		}
  		seek_forward(GIT_OID_HEXSZ + 1);
  
  		if (git_oid_fromstrn(&entry->oid_cur, buf, GIT_OID_HEXSZ) < GIT_SUCCESS) {
  			git__free(entry);
  			return GIT_ERROR;
  		}
  		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);
  
  		entry->committer = git__malloc(sizeof(git_signature));
  		if (entry->committer == NULL) {
  			git__free(entry);
  			return GIT_ENOMEM;
  		}
  
  		if ((error = git_signature__parse(entry->committer, &ptr, buf + 1, NULL, *buf)) < GIT_SUCCESS) {
  			git__free(entry->committer);
  			git__free(entry);
  			return git__rethrow(error, "Failed to parse reflog. Could not parse signature");
  		}
  
  		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);
  		} else
  			entry->msg = NULL;
  
  		while (*buf && *buf == '\n' && buf_size > 1)
  			seek_forward(1);
  
  		if ((error = git_vector_insert(&log->entries, entry)) < GIT_SUCCESS)
  			return git__rethrow(error, "Failed to parse reflog. Could not add new entry");
  	}
  
  #undef seek_forward
  
  	return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to parse reflog");
  }
  
  void git_reflog_free(git_reflog *reflog)
  {
  	unsigned int i;
  	git_reflog_entry *entry;
  
  	for (i=0; i < reflog->entries.length; i++) {
  		entry = git_vector_get(&reflog->entries, i);
  
  		git_signature_free(entry->committer);
  
  		git__free(entry->msg);
  		git__free(entry);
  	}
  
  	git_vector_free(&reflog->entries);
  	git__free(reflog->ref_name);
  	git__free(reflog);
  }
  
  int git_reflog_read(git_reflog **reflog, git_reference *ref)
  {
  	int error;
  	git_buf log_path = GIT_BUF_INIT;
  	git_fbuffer log_file = GIT_FBUFFER_INIT;
  	git_reflog *log = NULL;
  
  	*reflog = NULL;
  
  	if ((error = reflog_init(&log, ref)) < GIT_SUCCESS)
  		return git__rethrow(error, "Failed to read reflog. Cannot init reflog");
  
  	error = git_buf_join_n(&log_path, '/', 3,
  		ref->owner->path_repository, GIT_REFLOG_DIR, ref->name);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	if ((error = git_futils_readbuffer(&log_file, log_path.ptr)) < GIT_SUCCESS) {
  		git__rethrow(error, "Failed to read reflog. Cannot read file `%s`", log_path.ptr);
  		goto cleanup;
  	}
  
  	if ((error = reflog_parse(log, log_file.data, log_file.len)) < GIT_SUCCESS)
  		git__rethrow(error, "Failed to read reflog");
  	else
  		*reflog = log;
  
  cleanup:
  	if (error != GIT_SUCCESS && log != NULL)
  		git_reflog_free(log);
  	git_futils_freebuffer(&log_file);
  	git_buf_free(&log_path);
  
  	return error;
  }
  
  int git_reflog_write(git_reference *ref, const git_oid *oid_old,
  				const git_signature *committer, const char *msg)
  {
  	int error;
  	char old[GIT_OID_HEXSZ+1];
  	char new[GIT_OID_HEXSZ+1];
  	git_buf log_path = GIT_BUF_INIT;
  	git_reference *r;
  	const git_oid *oid;
  
  	if ((error = git_reference_resolve(&r, ref)) < GIT_SUCCESS)
  		return git__rethrow(error,
  			"Failed to write reflog. Cannot resolve reference `%s`", ref->name);
  
  	oid = git_reference_oid(r);
  	if (oid == NULL) {
  		error = git__throw(GIT_ERROR,
  			"Failed to write reflog. Cannot resolve reference `%s`", r->name);
  		git_reference_free(r);
  		return error;
  	}
  
  	git_reference_free(r);
  
  	git_oid_to_string(new, GIT_OID_HEXSZ+1, oid);
  
  	error = git_buf_join_n(&log_path, '/', 3,
  		ref->owner->path_repository, GIT_REFLOG_DIR, ref->name);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	if (git_futils_exists(log_path.ptr)) {
  		error = git_futils_mkpath2file(log_path.ptr, GIT_REFLOG_DIR_MODE);
  		if (error < GIT_SUCCESS)
  			git__rethrow(error,
  				"Failed to write reflog. Cannot create reflog directory");
  	} else if (git_futils_isfile(log_path.ptr)) {
  		error = git__throw(GIT_ERROR,
  			"Failed to write reflog. `%s` is directory", log_path.ptr);
  	} else if (oid_old == NULL) {
  		error = git__throw(GIT_ERROR,
  			"Failed to write reflog. Old OID cannot be NULL for existing reference");
  	}
  
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	if (oid_old)
  		git_oid_to_string(old, sizeof(old), oid_old);
  	else
  		p_snprintf(old, sizeof(old), "%0*d", GIT_OID_HEXSZ, 0);
  
  	error = reflog_write(log_path.ptr, old, new, committer, msg);
  
  cleanup:
  	git_buf_free(&log_path);
  	return error;
  }
  
  int git_reflog_rename(git_reference *ref, const char *new_name)
  {
  	int error;
  	git_buf old_path = GIT_BUF_INIT;
  	git_buf new_path = GIT_BUF_INIT;
  
  	if (git_buf_join_n(&old_path, '/', 3, ref->owner->path_repository,
  					   GIT_REFLOG_DIR, ref->name) &&
  		git_buf_join_n(&new_path, '/', 3, ref->owner->path_repository,
  					   GIT_REFLOG_DIR, new_name))
  		error = p_rename(git_buf_cstr(&old_path), git_buf_cstr(&new_path));
  	else
  		error = GIT_ENOMEM;
  
  	git_buf_free(&old_path);
  	git_buf_free(&new_path);
  
  	return error;
  }
  
  int git_reflog_delete(git_reference *ref)
  {
  	int error = GIT_SUCCESS;
  	git_buf path = GIT_BUF_INIT;
  
  	error = git_buf_join_n(&path, '/', 3,
  		ref->owner->path_repository, GIT_REFLOG_DIR, ref->name);
  
  	if (error == GIT_SUCCESS && git_futils_exists(path.ptr) == 0)
  		error = p_unlink(path.ptr);
  
  	git_buf_free(&path);
  
  	return error;
  }
  
  unsigned int git_reflog_entrycount(git_reflog *reflog)
  {
  	assert(reflog);
  	return reflog->entries.length;
  }
  
  const git_reflog_entry * git_reflog_entry_byindex(git_reflog *reflog, unsigned int idx)
  {
  	assert(reflog);
  	return git_vector_get(&reflog->entries, idx);
  }
  
  const git_oid * git_reflog_entry_oidold(const git_reflog_entry *entry)
  {
  	assert(entry);
  	return &entry->oid_old;
  }
  
  const git_oid * git_reflog_entry_oidnew(const git_reflog_entry *entry)
  {
  	assert(entry);
  	return &entry->oid_cur;
  }
  
  git_signature * git_reflog_entry_committer(const git_reflog_entry *entry)
  {
  	assert(entry);
  	return entry->committer;
  }
  
  char * git_reflog_entry_msg(const git_reflog_entry *entry)
  {
  	assert(entry);
  	return entry->msg;
  }
  

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