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portable: add return parameter to GetImageMetadataWithExtensions

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The complaint was that the output array was used for two kinds of data, and the
input flag decided whether this extra data should be included. The flag is
removed, and instead the old method is changed to include the data always as
a separate parameter.

This breaks backward compatibility, but  the old method is effectively broken
and does not appear to be used yet, at least in open source code, by
searching on codesearch.debian.net and github.com.

Fixes #22404.

Co-authored-by: Luca Boccassi <bluca@debian.org>
(cherry picked from commit 087a799f64)
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2022-03-03 16:26:36 +01:00 committed by Luca Boccassi
parent 06d466a05c
commit 00b5aa8d74
5 changed files with 111 additions and 98 deletions
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21
man/org.freedesktop.portable1.xml
View File

@ -54,6 +54,7 @@ node /org/freedesktop/portable1 {
in t flags,
out s image,
out ay os_release,
out a{say} extensions,
out a{say} units);
GetImageState(in s image,
out s state);
@ -183,19 +184,12 @@ node /org/freedesktop/portable1 {
and a list of portable units contained in the image, in the form of a string (unit name) and
an array of bytes with the content.</para>
<para><function>GetImageMetadataWithExtensions()</function> retrieves metadata associated with an image.
This method is a superset of <function>GetImageMetadata()</function> with the addition of
a list of extensions as input parameter, which were overlaid on top of the main
image via <function>AttachImageWithExtensions()</function>.
The <varname>flag</varname> parameter can be used to request that, before the units, the path of
each extension and an array of bytes with the content of the respective extension-release file
are sent. One such structure will be sent for each extension named in the input arguments. The
flag value to enable this functionality is defined as follows:</para>
<programlisting>
#define PORTABLE_INSPECT_EXTENSION_RELEASES (UINT64_C(1) &lt;&lt; 1)
</programlisting>
<para><function>GetImageMetadataWithExtensions()</function> retrieves metadata associated with an
image. This method is a superset of <function>GetImageMetadata()</function> with the addition of a list
of extensions as input parameter, which were overlaid on top of the main image via
<function>AttachImageWithExtensions()</function>. The path of each extension and an array of bytes with
the content of the respective extension-release file are returned, one such structure for each
extension named in the input arguments.</para>
<para><function>GetImageState()</function> retrieves the image state as one of the following
strings:
@ -340,6 +334,7 @@ node /org/freedesktop/portable1 {
in t flags,
out s image,
out ay os_release,
out a{say} extensions,
out a{say} units);
GetState(out s state);
Attach(in as matches,

11
src/portable/portable.h
View File

@ -21,12 +21,11 @@ typedef struct PortableMetadata {
#define PORTABLE_METADATA_IS_UNIT(m) (!IN_SET((m)->name[0], 0, '/'))
typedef enum PortableFlags {
PORTABLE_RUNTIME = 1 << 0,
PORTABLE_INSPECT_EXTENSION_RELEASES = 1 << 1, /* Public API via DBUS, do not change */
PORTABLE_PREFER_COPY = 1 << 2,
PORTABLE_PREFER_SYMLINK = 1 << 3,
PORTABLE_REATTACH = 1 << 4,
_PORTABLE_MASK_PUBLIC = PORTABLE_RUNTIME | PORTABLE_INSPECT_EXTENSION_RELEASES,
PORTABLE_RUNTIME = 1 << 0, /* Public API via DBUS, do not change */
PORTABLE_PREFER_COPY = 1 << 1,
PORTABLE_PREFER_SYMLINK = 1 << 2,
PORTABLE_REATTACH = 1 << 3,
_PORTABLE_MASK_PUBLIC = PORTABLE_RUNTIME,
_PORTABLE_TYPE_MAX,
_PORTABLE_TYPE_INVALID = -EINVAL,
} PortableFlags;

32
src/portable/portablectl.c
View File

@ -260,7 +260,7 @@ static int maybe_reload(sd_bus **bus) {
static int get_image_metadata(sd_bus *bus, const char *image, char **matches, sd_bus_message **reply) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
PortableFlags flags = PORTABLE_INSPECT_EXTENSION_RELEASES;
uint64_t flags = 0;
const char *method;
int r;
@ -362,12 +362,14 @@ static int inspect_image(int argc, char *argv[], void *userdata) {
strna(pretty_os));
}
if (!strv_isempty(arg_extension_images)) {
/* If we specified any extensions, we'll first get back exactly the paths (and
* extension-release content) for each one of the arguments. */
r = sd_bus_message_enter_container(reply, 'a', "{say}");
if (r < 0)
return bus_log_parse_error(r);
/* If we specified any extensions, we'll first get back exactly the
* paths (and extension-release content) for each one of the arguments. */
for (size_t i = 0; i < strv_length(arg_extension_images); ++i) {
const char *name;
@ -434,6 +436,15 @@ static int inspect_image(int argc, char *argv[], void *userdata) {
return bus_log_parse_error(r);
}
r = sd_bus_message_exit_container(reply);
if (r < 0)
return bus_log_parse_error(r);
}
r = sd_bus_message_enter_container(reply, 'a', "{say}");
if (r < 0)
return bus_log_parse_error(r);
for (;;) {
const char *name;
@ -764,18 +775,17 @@ static int maybe_stop_disable(sd_bus *bus, char *image, char *argv[]) {
if (r < 0)
return bus_log_parse_error(r);
r = sd_bus_message_enter_container(reply, 'a', "{say}");
if (r < 0)
return bus_log_parse_error(r);
/* If we specified any extensions, we'll first get back exactly the
* paths (and extension-release content) for each one of the arguments. */
for (size_t i = 0; i < strv_length(arg_extension_images); ++i) {
r = sd_bus_message_skip(reply, "{say}");
/* If we specified any extensions, we'll first an array of extension-release metadata. */
if (!strv_isempty(arg_extension_images)) {
r = sd_bus_message_skip(reply, "a{say}");
if (r < 0)
return bus_log_parse_error(r);
}
r = sd_bus_message_enter_container(reply, 'a', "{say}");
if (r < 0)
return bus_log_parse_error(r);
for (;;) {
const char *name;

1
src/portable/portabled-bus.c
View File

@ -420,6 +420,7 @@ const sd_bus_vtable manager_vtable[] = {
"t", flags),
SD_BUS_RESULT("s", image,
"ay", os_release,
"a{say}", extensions,
"a{say}", units),
method_get_image_metadata,
SD_BUS_VTABLE_UNPRIVILEGED),

30
src/portable/portabled-image-bus.c
View File

@ -108,7 +108,6 @@ int bus_image_common_get_metadata(
_cleanup_hashmap_free_ Hashmap *unit_files = NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_free_ PortableMetadata **sorted = NULL;
PortableFlags flags = 0;
int r;
assert(name_or_path || image);
@ -119,8 +118,10 @@ int bus_image_common_get_metadata(
m = image->userdata;
}
if (sd_bus_message_is_method_call(message, NULL, "GetImageMetadataWithExtensions") ||
sd_bus_message_is_method_call(message, NULL, "GetMetadataWithExtensions")) {
bool have_exti = sd_bus_message_is_method_call(message, NULL, "GetImageMetadataWithExtensions") ||
sd_bus_message_is_method_call(message, NULL, "GetMetadataWithExtensions");
if (have_exti) {
r = sd_bus_message_read_strv(message, &extension_images);
if (r < 0)
return r;
@ -130,8 +131,7 @@ int bus_image_common_get_metadata(
if (r < 0)
return r;
if (sd_bus_message_is_method_call(message, NULL, "GetImageMetadataWithExtensions") ||
sd_bus_message_is_method_call(message, NULL, "GetMetadataWithExtensions")) {
if (have_exti) {
uint64_t input_flags = 0;
r = sd_bus_message_read(message, "t", &input_flags);
@ -142,7 +142,6 @@ int bus_image_common_get_metadata(
return sd_bus_reply_method_errorf(message, SD_BUS_ERROR_INVALID_ARGS,
"Invalid 'flags' parameter '%" PRIu64 "'",
input_flags);
flags |= input_flags;
}
r = bus_image_acquire(m,
@ -186,16 +185,16 @@ int bus_image_common_get_metadata(
if (r < 0)
return r;
r = sd_bus_message_open_container(reply, 'a', "{say}");
if (r < 0)
return r;
/* If it was requested, also send back the extension path and the content
* of each extension-release file. Behind a flag, as it's an incompatible
* change. */
if (FLAGS_SET(flags, PORTABLE_INSPECT_EXTENSION_RELEASES)) {
if (have_exti) {
PortableMetadata *extension_release;
r = sd_bus_message_open_container(reply, 'a', "{say}");
if (r < 0)
return r;
ORDERED_HASHMAP_FOREACH(extension_release, extension_releases) {
r = sd_bus_message_open_container(reply, 'e', "say");
@ -214,8 +213,16 @@ int bus_image_common_get_metadata(
if (r < 0)
return r;
}
r = sd_bus_message_close_container(reply);
if (r < 0)
return r;
}
r = sd_bus_message_open_container(reply, 'a', "{say}");
if (r < 0)
return r;
for (size_t i = 0; i < hashmap_size(unit_files); i++) {
r = sd_bus_message_open_container(reply, 'e', "say");
@ -867,6 +874,7 @@ const sd_bus_vtable image_vtable[] = {
"t", flags),
SD_BUS_RESULT("s", image,
"ay", os_release,
"a{say}", extensions,
"a{say}", units),
bus_image_method_get_metadata,
SD_BUS_VTABLE_UNPRIVILEGED),