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gioutils: Many new utility functions 

Reading symbolic links becomes a much more common thing now.
This commit is contained in:
Colin Walters 2013-06-29 11:43:31 -04:00
parent f6946a368f
commit e3dc0c91df
2 changed files with 244 additions and 0 deletions
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207
src/libotutil/ot-gio-utils.c
View File

@ -132,3 +132,210 @@ ot_gfile_get_child_build_path (GFile *parent,
return g_file_resolve_relative_path (parent, path);
}
GFile *
ot_gfile_resolve_path_printf (GFile *path,
const char *format,
...)
{
va_list args;
gs_free char *relpath = NULL;
va_start (args, format);
relpath = g_strdup_vprintf (format, args);
va_end (args);
return g_file_resolve_relative_path (path, relpath);
}
gboolean
ot_gfile_get_symlink_target_from_info (GFile *path,
GFileInfo *file_info,
GFile **out_target,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
const char *target;
gs_unref_object GFile *path_parent = NULL;
gs_unref_object GFile *ret_target = NULL;
if (g_file_info_get_file_type (file_info) != G_FILE_TYPE_SYMBOLIC_LINK)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Not a symbolic link");
goto out;
}
path_parent = g_file_get_parent (path);
target = g_file_info_get_symlink_target (file_info);
g_assert (target);
ret_target = g_file_resolve_relative_path (path_parent, target);
ret = TRUE;
out:
ot_transfer_out_value (out_target, &ret_target);
return ret;
}
gboolean
ot_gfile_query_info_allow_noent (GFile *path,
const char *queryopts,
GFileQueryInfoFlags flags,
GFileInfo **out_info,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
gs_unref_object GFileInfo *ret_file_info = NULL;
GError *temp_error = NULL;
ret_file_info = g_file_query_info (path, queryopts, flags,
cancellable, &temp_error);
if (!ret_file_info)
{
if (g_error_matches (temp_error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND))
{
g_clear_error (&temp_error);
}
else
{
g_propagate_error (error, temp_error);
goto out;
}
}
ret = TRUE;
ot_transfer_out_value (out_info, &ret_file_info);
out:
return ret;
}
gboolean
ot_gfile_query_symlink_target_allow_noent (GFile *path,
GFile **out_target,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
gs_unref_object GFileInfo *file_info = NULL;
gs_unref_object GFile *ret_target = NULL;
if (!ot_gfile_query_info_allow_noent (path, OSTREE_GIO_FAST_QUERYINFO,
G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
&file_info,
cancellable, error))
goto out;
if (file_info != NULL)
{
if (!ot_gfile_get_symlink_target_from_info (path, file_info, &ret_target,
cancellable, error))
goto out;
}
ret = TRUE;
ot_transfer_out_value (out_target, &ret_target);
out:
return ret;
}
gboolean
ot_gfile_load_contents_utf8_allow_noent (GFile *path,
char **out_contents,
GCancellable *cancellable,
GError **error)
{
gboolean ret = TRUE;
GError *temp_error = NULL;
gs_free char *ret_contents = NULL;
ret_contents = gs_file_load_contents_utf8 (path, cancellable, &temp_error);
if (!ret_contents)
{
if (g_error_matches (temp_error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND))
{
g_clear_error (&temp_error);
}
else
{
g_propagate_error (error, temp_error);
goto out;
}
}
ret = TRUE;
ot_transfer_out_value (out_contents, &ret_contents);
out:
return ret;
}
/**
* ot_gfile_ensure_unlinked:
*
* Like gs_file_unlink(), but return successfully if the file doesn't
* exist.
*/
gboolean
ot_gfile_ensure_unlinked (GFile *path,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
GError *temp_error = NULL;
if (!gs_file_unlink (path, cancellable, &temp_error))
{
if (g_error_matches (temp_error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND))
{
g_clear_error (&temp_error);
}
else
{
g_propagate_error (error, temp_error);
goto out;
}
}
ret = TRUE;
out:
return ret;
}
/**
* ot_gfile_atomic_symlink_swap:
* @path: Replace the contents of this symbolic link
* @target: New symbolic link target
* @cancellable:
* @error
*
* Create a new temporary symbolic link, then use the Unix rename()
* function to atomically replace @path with the new symbolic link.
* Do not use this function inside directories such as /tmp as it uses
* a predicatable file name.
*/
gboolean
ot_gfile_atomic_symlink_swap (GFile *path,
const char *target,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
gs_unref_object GFile *parent = g_file_get_parent (path);
gs_free char *tmpname = g_strconcat (gs_file_get_basename_cached (path), ".tmp", NULL);
gs_unref_object GFile *tmppath = g_file_get_child (parent, tmpname);
if (!ot_gfile_ensure_unlinked (tmppath, cancellable, error))
goto out;
if (!g_file_make_symbolic_link (tmppath, target, cancellable, error))
goto out;
if (!gs_file_rename (tmppath, path, cancellable, error))
goto out;
ret = TRUE;
out:
return ret;
}

37
src/libotutil/ot-gio-utils.h
View File

@ -42,6 +42,43 @@ GFile *ot_gfile_get_child_strconcat (GFile *parent, const char *first, ...) G_GN
GFile *ot_gfile_get_child_build_path (GFile *parent, const char *first, ...) G_GNUC_NULL_TERMINATED;
GFile * ot_gfile_resolve_path_printf (GFile *path,
const char *format,
...) G_GNUC_PRINTF(2, 3);
gboolean ot_gfile_get_symlink_target_from_info (GFile *path,
GFileInfo *file_info,
GFile **out_target,
GCancellable *cancellable,
GError **error);
gboolean ot_gfile_query_info_allow_noent (GFile *path,
const char *queryopts,
GFileQueryInfoFlags flags,
GFileInfo **out_info,
GCancellable *cancellable,
GError **error);
gboolean ot_gfile_query_symlink_target_allow_noent (GFile *path,
GFile **out_target,
GCancellable *cancellable,
GError **error);
gboolean ot_gfile_load_contents_utf8_allow_noent (GFile *path,
char **out_contents,
GCancellable *cancellable,
GError **error);
gboolean ot_gfile_ensure_unlinked (GFile *path,
GCancellable *cancellable,
GError **error);
gboolean ot_gfile_atomic_symlink_swap (GFile *path,
const char *target,
GCancellable *cancellable,
GError **error);
G_END_DECLS
#endif