Bug 720180

Summary:	sys-apps/portage: add support to delay export of "A" variable until last moment
Product:	Portage Development	Reporter:	Zac Medico <zmedico>
Component:	Core - Ebuild Support	Assignee:	Portage team <dev-portage>
Status:	CONFIRMED ---
Severity:	enhancement	Keywords:	PATCH
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	All
See Also:	https://bugs.gentoo.org/show_bug.cgi?id=719202 https://github.com/gentoo/portage/pull/552 https://bugs.gentoo.org/show_bug.cgi?id=721088 https://bugs.gentoo.org/show_bug.cgi?id=830187
Whiteboard:
Package list:		Runtime testing required:	---

Description Zac Medico gentoo-dev

2020-04-30 19:52:15 UTC

For current EAPIs, PMS specifies that the "A" variable should be exported. For very large values of the "A" variable, this causes execve to fail with an "[Errno 7] Argument list too long" error as discussed in bug 719202.

In order to prepare for future EAPIs where the "A" variable will not be exported, it would make sense for portage to delay export of the "A" variable until the last moment. In theory, and ebuild could use "export -n A" to suppress "[Errno 7] Argument list too long" errors when spawning subprocesses.

Comment 1 Zac Medico gentoo-dev

2020-05-26 04:36:08 UTC

Patch posted for review:

https://archives.gentoo.org/gentoo-portage-dev/message/2c620e1f1b1b05a6af4c0ba9a3d81ad7
https://github.com/gentoo/portage/pull/552