From: Sergei Trofimovich <slyfox@gentoo.org>
Date: Tue, 23 Jul 2019 07:12:09 +0000 (+0100)
Subject: sys-libs/glibc: expose a knob to downgrade glibc
X-Git-Url: http://git.tremily.us/gitweb.cgi?a=commitdiff_plain;h=f0835514f598eb471edd0d92dc29536afbbcb039;p=gentoo.git

sys-libs/glibc: expose a knob to downgrade glibc

It's not something to be used lightly. Useful when the damage was not
yet done to the rest of the system.

Usage example:
    # I_ALLOW_TO_BREAK_MY_SYSTEM=yes emerge -v1 "=glibc-${old-version}"

Be prepared to deal with downgrade consequences like disappeared symbols
and versions of symbols

Package-Manager: Portage-2.3.69, Repoman-2.3.16
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
---

diff --git a/sys-libs/glibc/glibc-2.29-r2.ebuild b/sys-libs/glibc/glibc-2.29-r2.ebuild
index da78a273d19f..313e5c6b4404 100644
--- a/sys-libs/glibc/glibc-2.29-r2.ebuild
+++ b/sys-libs/glibc/glibc-2.29-r2.ebuild
@@ -614,7 +614,7 @@ sanity_prechecks() {
 		if has_version ">${CATEGORY}/${P}-r10000" ; then
 			eerror "Sanity check to keep you from breaking your system:"
 			eerror " Downgrading glibc is not supported and a sure way to destruction."
-			die "Aborting to save your system."
+			[[ ${I_ALLOW_TO_BREAK_MY_SYSTEM} = yes ]] || die "Aborting to save your system."
 		fi
 
 		if ! do_run_test '#include <unistd.h>\n#include <sys/syscall.h>\nint main(){return syscall(1000)!=-1;}\n' ; then
diff --git a/sys-libs/glibc/glibc-9999.ebuild b/sys-libs/glibc/glibc-9999.ebuild
index 2b0697465d55..0ba2efb974c9 100644
--- a/sys-libs/glibc/glibc-9999.ebuild
+++ b/sys-libs/glibc/glibc-9999.ebuild
@@ -621,7 +621,7 @@ sanity_prechecks() {
 		if has_version ">${CATEGORY}/${P}-r10000" ; then
 			eerror "Sanity check to keep you from breaking your system:"
 			eerror " Downgrading glibc is not supported and a sure way to destruction."
-			die "Aborting to save your system."
+			[[ ${I_ALLOW_TO_BREAK_MY_SYSTEM} = yes ]] || die "Aborting to save your system."
 		fi
 
 		if ! do_run_test '#include <unistd.h>\n#include <sys/syscall.h>\nint main(){return syscall(1000)!=-1;}\n' ; then