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/*
* 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_oid_to_string(new, GIT_OID_HEXSZ+1, oid);
git_reference_free(r);
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_path_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_path_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_path_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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