dev-python/sqlalchemy: disable greenlet dependency conditionally

We should try pull it in on arches where it's possible
but we shouldn't hard require it given most things
work fine without it.

Some applications do need it though, so do this
conditionally so they can depend on it rather
than ending up being broken by depcleans
or requiring people to put it in world files.

Closes: https://bugs.gentoo.org/828482
Signed-off-by: Sam James <sam@gentoo.org>

2 files changed, 59 insertions, 2 deletions

diff --git a/dev-python/sqlalchemy/files/sqlalchemy-1.4.27-drop-greenlet.patch b/dev-python/sqlalchemy/files/sqlalchemy-1.4.27-drop-greenlet.patch
new file mode 100644
index 000000000000..07184b843c9e
--- /dev/null
+++ b/dev-python/sqlalchemy/files/sqlalchemy-1.4.27-drop-greenlet.patch
@@ -0,0 +1,49 @@
+Not available on all arches we support and is only needed for
+a few consumers.
+
+https://bugs.gentoo.org/828482
+
+From: Sam James <sam@gentoo.org>
+Date: Wed, 8 Dec 2021 00:31:01 +0000
+Subject: [PATCH] Drop greenlet dependency
+
+--- a/setup.cfg
++++ b/setup.cfg
+@@ -36,11 +36,8 @@ package_dir =
+ 	=lib
+ install_requires = 
+ 	importlib-metadata;python_version<"3.8"
+-	greenlet != 0.4.17;python_version>='3' and (platform_machine=='aarch64' or (platform_machine=='ppc64le' or (platform_machine=='x86_64' or (platform_machine=='amd64' or (platform_machine=='AMD64' or (platform_machine=='win32' or platform_machine=='WIN32'))))))
+ 
+ [options.extras_require]
+-asyncio = 
+-	greenlet!=0.4.17;python_version>="3"
+ mypy = 
+ 	mypy >= 0.910;python_version>="3"
+ 	sqlalchemy2-stubs
+diff --git a/setup.cfg b/setup.cfg
+index b7f69e9..91993f7 100644
+--- a/setup.cfg
++++ b/setup.cfg
+@@ -57,7 +57,6 @@ oracle =
+ postgresql = psycopg2>=2.7
+ postgresql_pg8000 = pg8000>=1.16.6
+ postgresql_asyncpg = 
+-	%(asyncio)s
+ 	asyncpg;python_version>="3"
+ postgresql_psycopg2binary = psycopg2-binary
+ postgresql_psycopg2cffi = psycopg2cffi
+@@ -65,13 +64,10 @@ pymysql =
+ 	pymysql;python_version>="3"
+ 	pymysql<1;python_version<"3"
+ aiomysql = 
+-	%(asyncio)s
+ 	aiomysql;python_version>="3"
+ asyncmy = 
+-	%(asyncio)s
+ 	asyncmy>=0.2.3;python_version>="3"
+ aiosqlite = 
+-	%(asyncio)s
+ 	aiosqlite;python_version>="3"
+ 	typing_extensions!=3.10.0.1
+ sqlcipher = 
diff --git a/dev-python/sqlalchemy/sqlalchemy-1.4.27-r2.ebuild b/dev-python/sqlalchemy/sqlalchemy-1.4.27-r3.ebuild
index 24bcfe77ce84..21f126d011c4 100644
--- a/dev-python/sqlalchemy/sqlalchemy-1.4.27-r2.ebuild
+++ b/dev-python/sqlalchemy/sqlalchemy-1.4.27-r3.ebuild
@@ -19,10 +19,10 @@ S="${WORKDIR}/${MY_P}"
 LICENSE="MIT"
 SLOT="0"
 KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x64-solaris"
-IUSE="examples +sqlite test"
+IUSE="asyncio examples +sqlite test"
 
 # greenlet for bug #823794
-RDEPEND="virtual/python-greenlet[${PYTHON_USEDEP}]"
+RDEPEND="asyncio? ( virtual/python-greenlet[${PYTHON_USEDEP}] )"
 BDEPEND="
 	test? (
 		$(python_gen_impl_dep sqlite)
@@ -36,6 +36,14 @@ EPYTEST_IGNORE=(
 	test/aaa_profiling
 )
 
+src_prepare() {
+	if ! use asyncio ; then
+		eapply "${FILESDIR}"/${PN}-1.4.27-drop-greenlet.patch
+	fi
+
+	distutils-r1_src_prepare
+}
+
 python_install_all() {
 	if use examples; then
 		docompress -x "/usr/share/doc/${PF}/examples"