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/*

* Copyright 2010-2026 The pygit2 contributors

*

* This file is free software; you can redistribute it and/or modify

* it under the terms of the GNU General Public License, version 2,

* as published by the Free Software Foundation.

*

* In addition to the permissions in the GNU General Public License,

* the authors give you unlimited permission to link the compiled

* version of this file into combinations with other programs,

* and to distribute those combinations without any restriction

* coming from the use of this file. (The General Public License

* restrictions do apply in other respects; for example, they cover

* modification of the file, and distribution when not linked into

* a combined executable.)

*

* This file is distributed in the hope that it will be useful, but

* WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

* General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program; see the file COPYING. If not, write to

* the Free Software Foundation, 51 Franklin Street, Fifth Floor,

* Boston, MA 02110-1301, USA.

*/

#include "error.h"

extern PyObject *GitError;

extern PyObject *AlreadyExistsError;

extern PyObject *InvalidSpecError;

extern PyObject *InvalidError;

extern PyObject *NotFoundError;

extern PyObject *AmbiguousError;

extern PyObject *AuthError;

extern PyObject *CertificateError;

PyObject *

Error_type(int type)

{

const git_error* error;

/* Expected */

switch (type) {

/* Input does not exist in the scope searched. */

case GIT_ENOTFOUND:

return NotFoundError;

/* A reference with this name already exists */

case GIT_EEXISTS:

return AlreadyExistsError;

/* The given short oid is ambiguous */

case GIT_EAMBIGUOUS:

return AmbiguousError;

/* The buffer is too short to satisfy the request */

case GIT_EBUFS:

return PyExc_ValueError;

/* Invalid input spec */

case GIT_EINVALIDSPEC:

return InvalidSpecError;

/* Invalid operation or input */

case GIT_EINVALID:

return InvalidError;

/* Authentication error */

case GIT_EAUTH:

return AuthError;

/* Server certificate is invalid */

case GIT_ECERTIFICATE:

return CertificateError;

/* Skip and passthrough the given ODB backend */

case GIT_PASSTHROUGH:

return GitError;

/* No entries left in ref walker */

case GIT_ITEROVER:

return PyExc_StopIteration;

}

/* Critical */

error = git_error_last();

if (error != NULL) {

switch (error->klass) {

case GITERR_NOMEMORY:

return PyExc_MemoryError;

case GITERR_OS:

return PyExc_OSError;

case GITERR_INVALID:

return InvalidError;

}

}

return GitError;

}

PyObject *

Error_set(int err)

{

assert(err < 0);

/* GIT_EUSER means a Python callback raised an exception. Preserve that

* exception instead of overwriting it with a stale libgit2 error message. */

if (err == GIT_EUSER && PyErr_Occurred())

return NULL;

return Error_set_exc(Error_type(err));

}

PyObject *

Error_set_exc(PyObject* exception)

{

const git_error* error = git_error_last();

char* message = (error == NULL) ?

"(No error information given)" : error->message;

PyErr_SetString(exception, message);

return NULL;

}

PyObject *

Error_set_str(int err, const char *str)

{

/* GIT_EUSER means a Python callback raised an exception. Preserve it. */

if (err == GIT_EUSER && PyErr_Occurred())

return NULL;

if (err == GIT_ENOTFOUND) {

/* NotFoundError inherits from KeyError; the argument is the missing key. */

PyErr_SetString(NotFoundError, str);

return NULL;

}

const git_error *error = git_error_last();

if (error == NULL) /* Expected error - no error msg set */

return PyErr_Format(Error_type(err), "%s", str);

return PyErr_Format(Error_type(err), "%s: %s", str, error->message);

}

PyObject *

Error_set_oid(int err, const git_oid *oid, size_t len)

{

/* GIT_EUSER means a Python callback raised an exception. Preserve it. */

if (err == GIT_EUSER && PyErr_Occurred())

return NULL;

char hex[GIT_OID_HEXSZ + 1];

git_oid_fmt(hex, oid);

hex[len] = '\0';

return Error_set_str(err, hex);

}

PyObject *

Error_type_error(const char *format, PyObject *value)

{

PyErr_Format(PyExc_TypeError, format, Py_TYPE(value)->tp_name);

return NULL;

}

int

git_error_for_exc(void)

{

PyObject *err = PyErr_Occurred();

if (err) {

// FIXME Here we're masking exception, if the Python implementation has

// a genuine Key or Value error. We should have an explicit way for the

// Python callbacks to signal ENOTFOUND (and EAMBIGUOUS?)

// Not found is an expected condition (the ODB will try with the next

// backend), so we clear the exception.

if (PyErr_GivenExceptionMatches(err, PyExc_KeyError)) {

PyErr_Clear();

return GIT_ENOTFOUND;

}

if (PyErr_GivenExceptionMatches(err, PyExc_ValueError))

return GIT_EAMBIGUOUS;

return GIT_EUSER;

}

return 0;

}