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python3: use pure python UUID backend

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Python3 at runtime identifies the uuid backend to use to implement safe
time-based UUID generation functions. When the python _uuid extension
module, /usr/lib/python3.7/lib-dynload/_uuid.cpython-37m-<arch>.so
is not found, the fall back is to use a pure python implementation.

 - If uuid.h from util-linux is available at build time, the _uuid
   module is built and used. A Buildroot patch allows us to disable this
   build-time check and never build the _uuid module.

With the bump to python 3.7, an optional dependency on util-linux was
added to build the _uuid module. However, this may lead to circular
dependencies. To break this circular dependency, we can disable the
build of the _uuid module and always use the pure python implementation.

Ref:
http://lists.busybox.net/pipermail/buildroot/2018-October/233113.html
http://lists.busybox.net/pipermail/buildroot/2018-September/231060.html
http://lists.busybox.net/pipermail/buildroot/2018-October/233079.html

CC: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
Tested-by: Carlos Santos <casantos@datacom.com.br>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Matt Weber 2018-10-20 07:49:51 -05:00 committed by Peter Korsgaard
parent e33ea1c9a2
commit 0b68713aae
2 changed files with 3 additions and 14 deletions
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10
package/python3/Config.in
View File

@ -89,16 +89,6 @@ config BR2_PACKAGE_PYTHON3_UNICODEDATA
Unicode character database (used by stringprep module)
(large).
config BR2_PACKAGE_PYTHON3_UUID
bool "uuid module"
select BR2_PACKAGE_UTIL_LINUX
select BR2_PACKAGE_UTIL_LINUX_LIBUUID
help
This module provides immutable UUID objects (the UUID class)
and the functions uuid1(), uuid3(), uuid4(), uuid5() for
generating version 1, 3, 4, and 5 UUIDs as specified in RFC
4122.
config BR2_PACKAGE_PYTHON3_SQLITE
bool "sqlite module"
select BR2_PACKAGE_SQLITE

7
package/python3/python3.mk
View File

@ -94,11 +94,10 @@ ifneq ($(BR2_PACKAGE_PYTHON3_UNICODEDATA),y)
PYTHON3_CONF_OPTS += --disable-unicodedata
endif
ifeq ($(BR2_PACKAGE_PYTHON3_UUID),y)
PYTHON3_DEPENDENCIES += util-linux
else
# Disable auto-detection of uuid.h (util-linux)
# which would add _uuid module support, instead
# default to the pure python implementation
PYTHON3_CONF_OPTS += --disable-uuid
endif
ifeq ($(BR2_PACKAGE_PYTHON3_BZIP2),y)
PYTHON3_DEPENDENCIES += bzip2