diff options
Diffstat (limited to 'gsystem-file-utils.c')
| -rw-r--r-- | gsystem-file-utils.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/gsystem-file-utils.c b/gsystem-file-utils.c index 96b317a..639caca 100644 --- a/gsystem-file-utils.c +++ b/gsystem-file-utils.c @@ -37,6 +37,9 @@ #include <glib-unix.h> #include <limits.h> #include <dirent.h> +#ifdef GSYSTEM_CONFIG_XATTRS +#include <attr/xattr.h> +#endif static int close_nointr (int fd) @@ -1339,3 +1342,279 @@ gs_file_realpath (GFile *file) g_free (path); return g_file_new_for_path (path_real); } + +#ifdef GSYSTEM_CONFIG_XATTRS +static char * +canonicalize_xattrs (char *xattr_string, + size_t len) +{ + char *p; + GSList *xattrs = NULL; + GSList *iter; + GString *result; + + result = g_string_new (0); + + p = xattr_string; + while (p < xattr_string+len) + { + xattrs = g_slist_prepend (xattrs, p); + p += strlen (p) + 1; + } + + xattrs = g_slist_sort (xattrs, (GCompareFunc) strcmp); + for (iter = xattrs; iter; iter = iter->next) { + g_string_append (result, iter->data); + g_string_append_c (result, '\0'); + } + + g_slist_free (xattrs); + return g_string_free (result, FALSE); +} + +static GVariant * +variant_new_ay_bytes (GBytes *bytes) +{ + gsize size; + gconstpointer data; + data = g_bytes_get_data (bytes, &size); + g_bytes_ref (bytes); + return g_variant_new_from_data (G_VARIANT_TYPE ("ay"), data, size, + TRUE, (GDestroyNotify)g_bytes_unref, bytes); +} + +static gboolean +read_xattr_name_array (const char *path, + const char *xattrs, + size_t len, + GVariantBuilder *builder, + GError **error) +{ + gboolean ret = FALSE; + const char *p; + + p = xattrs; + while (p < xattrs+len) + { + ssize_t bytes_read; + char *buf; + GBytes *bytes = NULL; + + bytes_read = lgetxattr (path, p, NULL, 0); + if (bytes_read < 0) + { + _set_error_from_errno (error); + g_prefix_error (error, "lgetxattr (%s, %s) failed: ", path, p); + goto out; + } + if (bytes_read == 0) + continue; + + buf = g_malloc (bytes_read); + bytes = g_bytes_new_take (buf, bytes_read); + if (lgetxattr (path, p, buf, bytes_read) < 0) + { + g_bytes_unref (bytes); + _set_error_from_errno (error); + g_prefix_error (error, "lgetxattr (%s, %s) failed: ", path, p); + goto out; + } + + g_variant_builder_add (builder, "(@ay@ay)", + g_variant_new_bytestring (p), + variant_new_ay_bytes (bytes)); + + p = p + strlen (p) + 1; + g_bytes_unref (bytes); + } + + ret = TRUE; + out: + return ret; +} + +#endif + +/** + * gs_file_get_all_xattrs: + * @f: a #GFile + * @out_xattrs: (out): A new #GVariant containing the extended attributes + * @cancellable: Cancellable + * @error: Error + * + * Read all extended attributes of @f in a canonical sorted order, and + * set @out_xattrs with the result. + * + * If the filesystem does not support extended attributes, @out_xattrs + * will have 0 elements, and this function will return successfully. + */ +gboolean +gs_file_get_all_xattrs (GFile *f, + GVariant **out_xattrs, + GCancellable *cancellable, + GError **error) +{ + gboolean ret = FALSE; + const char *path; + ssize_t bytes_read; + GVariant *ret_xattrs = NULL; + char *xattr_names = NULL; + char *xattr_names_canonical = NULL; + GVariantBuilder builder; + gboolean builder_initialized = FALSE; + + path = gs_file_get_path_cached (f); + + g_variant_builder_init (&builder, G_VARIANT_TYPE ("a(ayay)")); + builder_initialized = TRUE; + +#ifdef GSYSTEM_CONFIG_XATTRS + bytes_read = llistxattr (path, NULL, 0); + + if (bytes_read < 0) + { + if (errno != ENOTSUP) + { + _set_error_from_errno (error); + g_prefix_error (error, "llistxattr (%s) failed: ", path); + goto out; + } + } + else if (bytes_read > 0) + { + xattr_names = g_malloc (bytes_read); + if (llistxattr (path, xattr_names, bytes_read) < 0) + { + _set_error_from_errno (error); + g_prefix_error (error, "llistxattr (%s) failed: ", path); + goto out; + } + xattr_names_canonical = canonicalize_xattrs (xattr_names, bytes_read); + + if (!read_xattr_name_array (path, xattr_names_canonical, bytes_read, &builder, error)) + goto out; + } + +#endif + + ret_xattrs = g_variant_builder_end (&builder); + g_variant_ref_sink (ret_xattrs); + + ret = TRUE; + gs_transfer_out_value (out_xattrs, &ret_xattrs); + out: + g_clear_pointer (&ret_xattrs, g_variant_unref); + g_clear_pointer (&xattr_names, g_free); + g_clear_pointer (&xattr_names_canonical, g_free); + if (!builder_initialized) + g_variant_builder_clear (&builder); + return ret; +} + +/** + * gs_fd_set_all_xattrs: + * @fd: File descriptor + * @xattrs: Extended attributes + * @cancellable: Cancellable + * @error: Error + * + * For each attribute in @xattrs, set its value on the file or + * directory referred to by @fd. This function does not remove any + * attributes not in @xattrs. + */ +gboolean +gs_fd_set_all_xattrs (int fd, + GVariant *xattrs, + GCancellable *cancellable, + GError **error) +{ +#ifdef GSYSTEM_CONFIG_XATTRS + gboolean ret = FALSE; + int i, n; + + n = g_variant_n_children (xattrs); + for (i = 0; i < n; i++) + { + const guint8* name; + const guint8* value_data; + GVariant *value = NULL; + gsize value_len; + int res; + + g_variant_get_child (xattrs, i, "(^&ay@ay)", + &name, &value); + value_data = g_variant_get_fixed_array (value, &value_len, 1); + + do + res = fsetxattr (fd, (char*)name, (char*)value_data, value_len, 0); + while (G_UNLIKELY (res == -1 && errno == EINTR)); + g_variant_unref (value); + if (G_UNLIKELY (res == -1)) + { + _set_error_from_errno (error); + goto out; + } + } + + ret = TRUE; + out: + return ret; +#else + return TRUE; +#endif +} + +/** + * gs_file_set_all_xattrs: + * @file: File descriptor + * @xattrs: Extended attributes + * @cancellable: Cancellable + * @error: Error + * + * For each attribute in @xattrs, set its value on the file or + * directory referred to by @file. This function does not remove any + * attributes not in @xattrs. + */ +gboolean +gs_file_set_all_xattrs (GFile *file, + GVariant *xattrs, + GCancellable *cancellable, + GError **error) +{ +#ifdef GSYSTEM_CONFIG_XATTRS + gboolean ret = FALSE; + const char *path; + int i, n; + + path = gs_file_get_path_cached (file); + + n = g_variant_n_children (xattrs); + for (i = 0; i < n; i++) + { + const guint8* name; + GVariant *value; + const guint8* value_data; + gsize value_len; + gboolean loop_err; + + g_variant_get_child (xattrs, i, "(^&ay@ay)", + &name, &value); + value_data = g_variant_get_fixed_array (value, &value_len, 1); + + loop_err = lsetxattr (path, (char*)name, (char*)value_data, value_len, 0) < 0; + g_clear_pointer (&value, (GDestroyNotify) g_variant_unref); + if (loop_err) + { + _set_error_from_errno (error); + g_prefix_error (error, "lsetxattr (%s, %s) failed: ", path, name); + goto out; + } + } + + ret = TRUE; + out: + return ret; +#else + return TRUE; +#endif +} |