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Diffstat (limited to 'libmount/python/tab.c')
| -rw-r--r-- | libmount/python/tab.c | 783 |
1 files changed, 783 insertions, 0 deletions
diff --git a/libmount/python/tab.c b/libmount/python/tab.c new file mode 100644 index 0000000..000bc13 --- /dev/null +++ b/libmount/python/tab.c @@ -0,0 +1,783 @@ +/* + * Python bindings for the libmount library. + * + * Copyright (C) 2013, Red Hat, Inc. All rights reserved. + * Written by Ondrej Oprala and Karel Zak + * + * This file is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 3 of the License, or (at your option) any later version. + * + * 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this file; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ +#include "pylibmount.h" + +static PyMemberDef Table_members[] = { + { NULL } +}; + +static int Table_set_parser_errcb(TableObject *self, PyObject *func, + void *closure __attribute__((unused))) +{ + PyObject *tmp; + + if (!func) { + PyErr_SetString(PyExc_TypeError, NODEL_ATTR); + return -1; + } + + if (!PyCallable_Check(func)) + return -1; + + tmp = self->errcb; + Py_INCREF(func); + self->errcb = func; + Py_XDECREF(tmp); + return 0; +} + +static PyObject *Table_get_intro_comment(TableObject *self, + void *closure __attribute__((unused))) +{ + return PyObjectResultStr(mnt_table_get_intro_comment(self->tab)); +} + +static int Table_set_intro_comment(TableObject *self, PyObject *value, + void *closure __attribute__((unused))) +{ + char *comment = NULL; + int rc = 0; + + if (!value) { + PyErr_SetString(PyExc_TypeError, NODEL_ATTR); + return -1; + } + if (!(comment = pystos(value))) + return -1; + + if ((rc = mnt_table_set_intro_comment(self->tab, comment))) { + UL_RaiseExc(-rc); + return -1; + } + return 0; +} + +static PyObject *Table_get_trailing_comment(TableObject *self, + void *closure __attribute__((unused))) +{ + return PyObjectResultStr(mnt_table_get_trailing_comment(self->tab)); +} + +static int Table_set_trailing_comment(TableObject *self, PyObject *value, + void *closure __attribute__((unused))) +{ + char *comment = NULL; + int rc = 0; + + if (!value) { + PyErr_SetString(PyExc_TypeError, NODEL_ATTR); + return -1; + } + if (!(comment = pystos(value))) + return -1; + + if ((rc = mnt_table_set_trailing_comment(self->tab, comment))) { + UL_RaiseExc(-rc); + return -1; + } + return 0; +} + +#define Table_enable_comments_HELP "enable_comments(enable)\n\n" \ + "Enables parsing of comments.\n\n" \ + "The initial (intro) file comment is accessible by\n" \ + "Tab.intro_comment. The intro and the comment of the first fstab" \ + "entry has to be separated by blank line. The filesystem comments are\n" \ + "accessible by Fs.comment. The tailing fstab comment is accessible\n" \ + "by Tab.trailing_comment.\n" \ + "\n" \ + "<informalexample>\n" \ + "<programlisting>\n" \ + "#\n" \ + "# Intro comment\n" \ + "#\n" \ + "\n" \ + "# this comments belongs to the first fs\n" \ + "LABEL=foo /mnt/foo auto defaults 1 2\n" \ + "# this comments belongs to the second fs\n" \ + "LABEL=bar /mnt/bar auto defaults 1 2 \n" \ + "# tailing comment\n" \ + "</programlisting>\n" \ + "</informalexample>" +static PyObject *Table_enable_comments(TableObject *self, PyObject *args, + PyObject *kwds) +{ + int enable = 0; + char *kwlist[] = {"enable", NULL}; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "i", kwlist, &enable)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + mnt_table_enable_comments(self->tab, enable); + Py_INCREF(self); + return (PyObject *)self; +} + +#define Table_replace_file_HELP "replace_file(filename)\n\n" \ + "This function replaces filename with the new content from TableObject." +static PyObject *Table_replace_file(TableObject *self, PyObject *args, PyObject *kwds) +{ + int rc; + char *filename = NULL; + char *kwlist[] = {"filename", NULL}; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "s", kwlist, &filename)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + rc = mnt_table_replace_file(self->tab, filename); + return rc ? UL_RaiseExc(-rc) : UL_IncRef(self); +} + +#define Table_write_file_HELP "write_file(path)\n\n" \ + "This function writes tab to file(stream)" +static PyObject *Table_write_file(TableObject *self, PyObject *args, PyObject *kwds) +{ + int rc; + //PyObject *stream = NULL; + FILE *f = NULL; + char *path = NULL; + char *kwlist[] = {"path", NULL}; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "s", kwlist, + &path)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + if (!(f = fopen(path, "w"))) + return UL_RaiseExc(errno); + rc = mnt_table_write_file(self->tab, f); + fclose(f); + return rc ? UL_RaiseExc(-rc) : UL_IncRef(self); +} + +#define Table_find_devno_HELP "find_devno(devno, [direction])\n\n" \ + "Note that zero could be valid device number for root pseudo " \ + "filesystem (e.g. tmpfs)\n" \ + "Returns a tab entry or None" +static PyObject *Table_find_devno(TableObject *self, PyObject *args, PyObject *kwds) +{ + dev_t devno; + int direction = MNT_ITER_BACKWARD; + char *kwlist[] = {"devno", "direction", NULL}; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "I|i", kwlist, &devno, &direction)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + return PyObjectResultFs(mnt_table_find_devno(self->tab, devno, direction)); +} + +#define Table_find_mountpoint_HELP "find_mountpoint(path, [direction])\n\n" \ + "Returns a tab entry or None." +static PyObject *Table_find_mountpoint(TableObject *self, PyObject *args, PyObject *kwds) +{ + char *path; + int direction = MNT_ITER_BACKWARD; + char *kwlist[] = {"path", "direction", NULL}; + + if (! PyArg_ParseTupleAndKeywords(args, kwds, "s|i", kwlist, &path, &direction)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + return PyObjectResultFs(mnt_table_find_mountpoint(self->tab, path, direction)); +} + +#define Table_find_pair_HELP "find_pair(source, target, [direction])\n\n" \ + "Returns a tab entry or None." +static PyObject *Table_find_pair(TableObject *self, PyObject *args, PyObject *kwds) +{ + char *kwlist[] = {"source", "target", "direction", NULL}; + char *source; + char *target; + int direction = MNT_ITER_BACKWARD; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "ss|i", kwlist, &source, &target, &direction)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + return PyObjectResultFs(mnt_table_find_pair(self->tab, source, target, direction)); +} + +#define Table_find_source_HELP "find_source(source, [direction])\n\n" \ + "Returns a tab entry or None." +static PyObject *Table_find_source(TableObject *self, PyObject *args, PyObject *kwds) +{ + char *kwlist[] = {"source", "direction", NULL}; + char *source; + int direction = MNT_ITER_BACKWARD; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|i", kwlist, &source, &direction)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + return PyObjectResultFs(mnt_table_find_source(self->tab, source, direction)); +} + +#define Table_find_target_HELP "find_target(target, [direction])\n\n" \ + "Try to lookup an entry in given tab, possible are three iterations, first\n" \ + "with path, second with realpath(path) and third with realpath(path)\n" \ + "against realpath(fs->target). The 2nd and 3rd iterations are not performed\n" \ + "when tb cache is not set (cache not implemented yet).\n" \ + "\n" \ + "Returns a tab entry or None." +static PyObject *Table_find_target(TableObject *self, PyObject *args, PyObject *kwds) +{ + char *kwlist[] = {"target", "direction", NULL}; + char *target; + int direction = MNT_ITER_BACKWARD; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|i", kwlist, &target, &direction)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + return PyObjectResultFs(mnt_table_find_target(self->tab, target, direction)); +} + +#define Table_find_srcpath_HELP "find_srcpath(srcpath, [direction])\n\n" \ + "Try to lookup an entry in given tab, possible are four iterations, first\n" \ + "with path, second with realpath(path), third with tags (LABEL, UUID, ..)\n" \ + "from path and fourth with realpath(path) against realpath(entry->srcpath).\n" \ + "\n" \ + "The 2nd, 3rd and 4th iterations are not performed when tb cache is not\n" \ + "set (not implemented yet).\n" \ + "\n" \ + "Note that None is a valid source path; it will be replaced with \"none\". The\n" \ + "\"none\" is used in /proc/{mounts,self/mountinfo} for pseudo filesystems.\n" \ + "\n" \ + "Returns a tab entry or None." +static PyObject *Table_find_srcpath(TableObject *self, PyObject *args, PyObject *kwds) +{ + char *kwlist[] = {"srcpath", "direction", NULL}; + char *srcpath; + int direction = MNT_ITER_BACKWARD; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|i", kwlist, &srcpath, &direction)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + return PyObjectResultFs(mnt_table_find_srcpath(self->tab, srcpath, direction)); +} + +#define Table_find_tag_HELP "find_tag(tag, val, [direction])\n\n" \ + "Try to lookup an entry in given tab, first attempt is lookup by tag and\n" \ + "val, for the second attempt the tag is evaluated (converted to the device\n" \ + "name) and Tab.find_srcpath() is performed. The second attempt is not\n" \ + "performed when tb cache is not set (not implemented yet).\n" \ + "\n" \ + "Returns a tab entry or NULL." +static PyObject *Table_find_tag(TableObject *self, PyObject *args, PyObject *kwds) +{ + char *kwlist[] = {"tag", "val", "direction", NULL}; + char *tag; + char *val; + int direction = MNT_ITER_BACKWARD; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "ss|i", kwlist, &tag, &val, &direction)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + return PyObjectResultFs(mnt_table_find_tag(self->tab, tag, val, direction)); +} + +static PyObject *Table_get_nents(TableObject *self) +{ + return PyObjectResultInt(mnt_table_get_nents(self->tab)); +} + +#define Table_is_fs_mounted_HELP "is_fs_mounted(fstab_fs)\n\n" \ + "Checks if the fstab_fs entry is already in the tb table. The \"swap\" is\n" \ + "ignored. This function explicitly compares source, target and root of the\n" \ + "filesystems.\n" \ + "\n" \ + "Note that source and target are canonicalized only if a cache for tb is\n" \ + "defined (not implemented yet). The target canonicalization may\n" \ + "trigger automount on autofs mountpoints!\n" \ + "\n" \ + "Don't use it if you want to know if a device is mounted, just use\n" \ + "Tab.find_source() for the device.\n" \ + "\n" \ + "This function is designed mostly for \"mount -a\".\n" \ + "\n" \ + "Returns a boolean value." +static PyObject *Table_is_fs_mounted(TableObject *self, PyObject *args, PyObject *kwds) +{ + FsObject *fs; + char *kwlist[] = {"fstab_fs", NULL}; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "O!", kwlist, &FsType, &fs)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + return PyBool_FromLong(mnt_table_is_fs_mounted(self->tab, fs->fs)); +} + +#define Table_parse_file_HELP "parse_file(file)\n\n" \ + "Parses whole table (e.g. /etc/mtab) and appends new records to the tab.\n" \ + "\n" \ + "The libmount parser ignores broken (syntax error) lines, these lines are\n" \ + "reported to caller by errcb() function (see Tab.parser_errcb).\n" \ + "\n" \ + "Returns self or raises an exception in case of an error." +static PyObject *Table_parse_file(TableObject *self, PyObject* args, PyObject *kwds) +{ + int rc; + char *file = NULL; + char *kwlist[] = {"file", NULL}; + if (!PyArg_ParseTupleAndKeywords(args, kwds, "s", kwlist, &file)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + rc = mnt_table_parse_file(self->tab, file); + return rc ? UL_RaiseExc(-rc) : UL_IncRef(self); +} + +#define Table_parse_fstab_HELP "parse_fstab([fstab])\n\n" \ + "This function parses /etc/fstab and appends new lines to the tab. If the\n" \ + "filename is a directory then Tab.parse_dir() is called.\n" \ + "\n" \ + "See also Tab.parser_errcb.\n" \ + "\n" \ + "Returns self or raises an exception in case of an error." +static PyObject *Table_parse_fstab(TableObject *self, PyObject* args, PyObject *kwds) +{ + int rc; + char *fstab = NULL; + char *kwlist[] = {"fstab", NULL}; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "|s", kwlist, &fstab)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + rc = mnt_table_parse_fstab(self->tab, fstab); + return rc ? UL_RaiseExc(-rc) : UL_IncRef(self); +} + +#define Table_parse_mtab_HELP "parse_mtab([mtab])\n\n" \ + "This function parses /etc/mtab or /proc/self/mountinfo\n" \ + "/run/mount/utabs or /proc/mounts.\n" \ + "\n" \ + "See also Tab.parser_errcb().\n" \ + "\n" \ + "Returns self or raises an exception in case of an error." +static PyObject *Table_parse_mtab(TableObject *self, PyObject* args, PyObject *kwds) +{ + int rc; + char *mtab = NULL; + char *kwlist[] = {"mtab", NULL}; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "|s", kwlist, &mtab)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + rc = mnt_table_parse_mtab(self->tab, mtab); + return rc ? UL_RaiseExc(-rc) : UL_IncRef(self); +} + +#define Table_parse_dir_HELP "parse_dir(dir)\n\n" \ + "The directory:\n" \ + "- files are sorted by strverscmp(3)\n" \ + "- files that start with \".\" are ignored (e.g. \".10foo.fstab\")\n" \ + "- files without the \".fstab\" extension are ignored\n" \ + "\n" \ + "Returns self or raises an exception in case of an error." +static PyObject *Table_parse_dir(TableObject *self, PyObject* args, PyObject *kwds) +{ + int rc; + char *dir = NULL; + char *kwlist[] = {"dir", NULL}; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "s", kwlist, &dir)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + rc = mnt_table_parse_dir(self->tab, dir); + return rc ? UL_RaiseExc(-rc) : UL_IncRef(self); +} + +#define Table_parse_swaps_HELP "parse_swaps(swaps)\n\n" \ + "This function parses /proc/swaps and appends new lines to the tab" +static PyObject *Table_parse_swaps(TableObject *self, PyObject* args, PyObject *kwds) +{ + int rc; + char *swaps = NULL; + char *kwlist[] = {"swaps", NULL}; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "s", kwlist, &swaps)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + rc = mnt_table_parse_swaps(self->tab, swaps); + return rc ? UL_RaiseExc(-rc) : UL_IncRef(self); +} + +#define Table_add_fs_HELP "add_fs(fs)\n\nAdds a new entry to tab.\n" \ + "Returns self or raises an exception in case of an error." + +static PyObject *Table_add_fs(TableObject *self, PyObject* args, PyObject *kwds) +{ + int rc; + FsObject *fs = NULL; + char *kwlist[] = {"fs", NULL}; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "O!", kwlist, &FsType, &fs)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + Py_INCREF(fs); + rc = mnt_table_add_fs(self->tab, fs->fs); + return rc ? UL_RaiseExc(-rc) : UL_IncRef(self); +} + +#define Table_remove_fs_HELP "remove_fs(fs)\n\n" \ + "Returns self or raises an exception in case of an error." +static PyObject *Table_remove_fs(TableObject *self, PyObject* args, PyObject *kwds) +{ + int rc; + FsObject *fs = NULL; + char *kwlist[] = {"fs", NULL}; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "O!", kwlist, &FsType, &fs)) { + PyErr_SetString(PyExc_TypeError, ARG_ERR); + return NULL; + } + rc = mnt_table_remove_fs(self->tab, fs->fs); + Py_DECREF(fs); + return rc ? UL_RaiseExc(-rc) : UL_IncRef(self); +} + +#define Table_next_fs_HELP "next_fs()\n\n" \ + "Returns the next Fs on success, raises an exception in case " \ + "of an error and None at end of list.\n" \ + "\n" \ + "Example:\n" \ + "<informalexample>\n" \ + "<programlisting>\n" \ + "import libmount\n" \ + "import functools\n" \ + "for fs in iter(functools.partial(tb.next_fs), None):\n" \ + " dir = Fs.target\n" \ + " print \"mount point: {:s}\".format(dir)\n" \ + "\n" \ + "</programlisting>\n" \ + "</informalexample>\n" \ + "\n" \ + "lists all mountpoints from fstab in backward order." +static PyObject *Table_next_fs(TableObject *self) +{ + struct libmnt_fs *fs; + int rc; + + /* Reset the builtin iterator after reaching the end of the list */ + rc = mnt_table_next_fs(self->tab, self->iter, &fs); + if (rc == 1) { + mnt_reset_iter(self->iter, MNT_ITER_FORWARD); + Py_RETURN_NONE; + } + + if (rc) + return UL_RaiseExc(-rc); + + return PyObjectResultFs(fs); +} + +static PyMethodDef Table_methods[] = { + {"enable_comments", (PyCFunction)Table_enable_comments, METH_VARARGS|METH_KEYWORDS, Table_enable_comments_HELP}, + {"find_pair", (PyCFunction)Table_find_pair, METH_VARARGS|METH_KEYWORDS, Table_find_pair_HELP}, + {"find_source", (PyCFunction)Table_find_source, METH_VARARGS|METH_KEYWORDS, Table_find_source_HELP}, + {"find_srcpath", (PyCFunction)Table_find_srcpath, METH_VARARGS|METH_KEYWORDS, Table_find_srcpath_HELP}, + {"find_tag", (PyCFunction)Table_find_tag, METH_VARARGS|METH_KEYWORDS, Table_find_tag_HELP}, + {"find_target", (PyCFunction)Table_find_target, METH_VARARGS|METH_KEYWORDS, Table_find_target_HELP}, + {"find_devno", (PyCFunction)Table_find_devno, METH_VARARGS|METH_KEYWORDS, Table_find_devno_HELP}, + {"find_mountpoint", (PyCFunction)Table_find_mountpoint, METH_VARARGS|METH_KEYWORDS, Table_find_mountpoint_HELP}, + {"parse_file", (PyCFunction)Table_parse_file, METH_VARARGS|METH_KEYWORDS, Table_parse_file_HELP}, + {"parse_fstab", (PyCFunction)Table_parse_fstab, METH_VARARGS|METH_KEYWORDS, Table_parse_fstab_HELP}, + {"parse_mtab", (PyCFunction)Table_parse_mtab, METH_VARARGS|METH_KEYWORDS, Table_parse_mtab_HELP}, + {"parse_dir", (PyCFunction)Table_parse_dir, METH_VARARGS|METH_KEYWORDS, Table_parse_dir_HELP}, + {"parse_swaps", (PyCFunction)Table_parse_swaps, METH_VARARGS|METH_KEYWORDS, Table_parse_swaps_HELP}, + {"is_fs_mounted", (PyCFunction)Table_is_fs_mounted, METH_VARARGS|METH_KEYWORDS, Table_is_fs_mounted_HELP}, + {"add_fs", (PyCFunction)Table_add_fs, METH_VARARGS|METH_KEYWORDS, Table_add_fs_HELP}, + {"remove_fs", (PyCFunction)Table_remove_fs, METH_VARARGS|METH_KEYWORDS, Table_remove_fs_HELP}, + {"next_fs", (PyCFunction)Table_next_fs, METH_NOARGS, Table_next_fs_HELP}, + {"write_file", (PyCFunction)Table_write_file, METH_VARARGS|METH_KEYWORDS, Table_write_file_HELP}, + {"replace_file", (PyCFunction)Table_replace_file, METH_VARARGS|METH_KEYWORDS, Table_replace_file_HELP}, + {NULL} +}; + +/* mnt_free_tab() with a few necessary additions */ +void Table_unref(struct libmnt_table *tab) +{ + struct libmnt_fs *fs; + struct libmnt_iter *iter; + + if (!tab) + return; + + DBG(TAB, pymnt_debug_h(tab, "un-referencing filesystems")); + + iter = mnt_new_iter(MNT_ITER_BACKWARD); + + /* remove pylibmount specific references to the entries */ + while (mnt_table_next_fs(tab, iter, &fs) == 0) + Py_XDECREF(mnt_fs_get_userdata(fs)); + + DBG(TAB, pymnt_debug_h(tab, "un-referencing table")); + + mnt_unref_table(tab); + mnt_free_iter(iter); +} + +static void Table_destructor(TableObject *self) +{ + DBG(TAB, pymnt_debug_h(self->tab, "destructor py-obj: %p, py-refcnt=%d", + self, (int) ((PyObject *) self)->ob_refcnt)); + Table_unref(self->tab); + self->tab = NULL; + + mnt_free_iter(self->iter); + Py_XDECREF(self->errcb); + PyFree(self); +} + +static PyObject *Table_new(PyTypeObject *type, + PyObject *args __attribute__((unused)), + PyObject *kwds __attribute__((unused))) +{ + TableObject *self = (TableObject*)type->tp_alloc(type, 0); + + if (self) { + DBG(TAB, pymnt_debug_h(self, "new")); + + self->tab = NULL; + self->iter = NULL; + self->errcb = NULL; + } + return (PyObject *)self; +} + +/* explicit tab.__init__() serves as mnt_reset_table(tab) would in C + * and as mnt_new_table{,_from_dir,_from_file}() with proper arguments */ +#define Table_HELP "Table(path=None, errcb=None)" +static int Table_init(TableObject *self, PyObject *args, PyObject *kwds) +{ + struct libmnt_cache *cache; + char *path = NULL; + char *kwlist[] = {"path", "errcb", NULL}; + PyObject *errcb = NULL; + struct stat buf; + + memset (&buf, 0, sizeof(struct stat)); + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "|sO", + kwlist, &path, &errcb)) + return -1; + + DBG(TAB, pymnt_debug_h(self, "init")); + + Table_unref(self->tab); + self->tab = NULL; + + if (self->iter) + mnt_reset_iter(self->iter, MNT_ITER_FORWARD); + else + self->iter = mnt_new_iter(MNT_ITER_FORWARD); + + if (errcb) { + PyObject *tmp; + if (!PyCallable_Check(errcb)) + return -1; + tmp = self->errcb; + Py_INCREF(errcb); + self->errcb = errcb; + Py_XDECREF(tmp); + } else { + Py_XDECREF(self->errcb); + self->errcb = NULL; + } + + if (path) { + DBG(TAB, pymnt_debug_h(self, "init: path defined (%s)", path)); + + if (stat(path, &buf)) { + /* TODO: weird */ + PyErr_SetFromErrno(PyExc_RuntimeError); + return -1; + } + if (S_ISREG(buf.st_mode)) + self->tab = mnt_new_table_from_file(path); + else if (S_ISDIR(buf.st_mode)) + self->tab = mnt_new_table_from_dir(path); + } else { + DBG(TAB, pymnt_debug_h(self, "init: allocate empty table")); + self->tab = mnt_new_table(); + } + + /* Always set custom handler when using libmount from python */ + mnt_table_set_parser_errcb(self->tab, pymnt_table_parser_errcb); + mnt_table_set_userdata(self->tab, self); + + cache = mnt_new_cache(); /* TODO: make it optional? */ + if (!cache) + return -1; + mnt_table_set_cache(self->tab, cache); + mnt_unref_cache(cache); + + return 0; +} + +/* Handler for the tab->errcb callback */ +int pymnt_table_parser_errcb(struct libmnt_table *tb, const char *filename, int line) +{ + int rc = 0; + PyObject *obj; + + obj = mnt_table_get_userdata(tb); + if (obj && ((TableObject*) obj)->errcb) { + PyObject *arglist, *result; + + arglist = Py_BuildValue("(Osi)", obj, filename, line); + if (!arglist) + return -ENOMEM; + + /* A python callback was set, so tb is definitely encapsulated in an object */ + result = PyObject_Call(((TableObject *)obj)->errcb, arglist, NULL); + Py_DECREF(arglist); + + if (!result) + return -EINVAL; + if (!PyArg_Parse(result, "i", &rc)) + rc = -EINVAL; + Py_DECREF(result); + } + return rc; +} + +PyObject *PyObjectResultTab(struct libmnt_table *tab) +{ + TableObject *result; + + if (!tab) { + PyErr_SetString(LibmountError, "internal exception"); + return NULL; + } + + result = mnt_table_get_userdata(tab); + if (result) { + Py_INCREF(result); + DBG(TAB, pymnt_debug_h(tab, "result py-obj %p: already exists, py-refcnt=%d", + result, (int) ((PyObject *) result)->ob_refcnt)); + return (PyObject *) result; + } + + /* Creating an encapsulating object: increment the refcount, so that + * code such as: cxt.get_fstab() doesn't call the destructor, which + * would free our tab struct as well + */ + result = PyObject_New(TableObject, &TableType); + if (!result) { + UL_RaiseExc(ENOMEM); + return NULL; + } + + Py_INCREF(result); + mnt_ref_table(tab); + + DBG(TAB, pymnt_debug_h(tab, "result py-obj %p new, py-refcnt=%d", + result, (int) ((PyObject *) result)->ob_refcnt)); + result->tab = tab; + result->iter = mnt_new_iter(MNT_ITER_FORWARD); + mnt_table_set_userdata(result->tab, result); + result->errcb = NULL; + return (PyObject *) result; +} + +static PyGetSetDef Table_getseters[] = { + {"nents", (getter)Table_get_nents, NULL, "number of valid entries in tab", NULL}, + {"intro_comment", (getter)Table_get_intro_comment, (setter)Table_set_intro_comment, "fstab intro comment", NULL}, + {"trailing_comment", (getter)Table_get_trailing_comment, (setter)Table_set_trailing_comment, "fstab trailing comment", NULL}, + {"errcb", NULL, (setter)Table_set_parser_errcb, "parser error callback", NULL}, + {NULL} +}; + + +static PyObject *Table_repr(TableObject *self) +{ + return PyUnicode_FromFormat( + "<libmount.Table object at %p, entries=%d, comments_enabled=%s, errcb=%s>", + self, + mnt_table_get_nents(self->tab), + mnt_table_with_comments(self->tab) ? "True" : "False", + self->errcb ? pystos(PyObject_Repr(self->errcb)) : "None"); +} + +PyTypeObject TableType = { + PyVarObject_HEAD_INIT(NULL, 0) + "libmount.Table", /*tp_name*/ + sizeof(TableObject), /*tp_basicsize*/ + 0, /*tp_itemsize*/ + (destructor)Table_destructor, /*tp_dealloc*/ + 0, /*tp_print*/ + NULL, /*tp_getattr*/ + NULL, /*tp_setattr*/ + NULL, /*tp_compare*/ + (reprfunc) Table_repr, /*tp_repr*/ + NULL, /*tp_as_number*/ + NULL, /*tp_as_sequence*/ + NULL, /*tp_as_mapping*/ + NULL, /*tp_hash */ + NULL, /*tp_call*/ + NULL, /*tp_str*/ + NULL, /*tp_getattro*/ + NULL, /*tp_setattro*/ + NULL, /*tp_as_buffer*/ + Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/ + Table_HELP, /* tp_doc */ + NULL, /* tp_traverse */ + NULL, /* tp_clear */ + NULL, /* tp_richcompare */ + 0, /* tp_weaklistoffset */ + NULL, /* tp_iter */ + NULL, /* tp_iternext */ + Table_methods, /* tp_methods */ + Table_members, /* tp_members */ + Table_getseters, /* tp_getset */ + NULL, /* tp_base */ + NULL, /* tp_dict */ + NULL, /* tp_descr_get */ + NULL, /* tp_descr_set */ + 0, /* tp_dictoffset */ + (initproc)Table_init, /* tp_init */ + NULL, /* tp_alloc */ + Table_new, /* tp_new */ +}; + +void Table_AddModuleObject(PyObject *mod) +{ + if (PyType_Ready(&TableType) < 0) + return; + + DBG(TAB, pymnt_debug("add to module")); + + Py_INCREF(&TableType); + PyModule_AddObject(mod, "Table", (PyObject *)&TableType); +} + |