sys-apps/grep: install silent egrep+fgrep by default

GNU grep 3.8+ deprecates egrep and fgrep and installs noisy wrappers
which warn to stderr. This ends up breaking a large amount of scripts,
tooling, and build systems for little real-world gain.

This adds a USE flag (USE=egrep-fgrep) which installs non-noisy wrappers. If
the flag is disabled, the upstream behaviour is used (noisy wrappers which
may one day be removed).

See https://lists.gnu.org/archive/html/bug-grep/2022-10/msg00000.html.

Signed-off-by: Sam James <sam@gentoo.org>

1 files changed, 100 insertions, 0 deletions

diff --git a/sys-apps/grep/grep-3.8-r1.ebuild b/sys-apps/grep/grep-3.8-r1.ebuild
new file mode 100644
index 000000000000..383ac1eb28d7
--- /dev/null
+++ b/sys-apps/grep/grep-3.8-r1.ebuild
@@ -0,0 +1,100 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+VERIFY_SIG_OPENPGP_KEY_PATH="${BROOT}"/usr/share/openpgp-keys/grep.asc
+inherit flag-o-matic verify-sig
+
+DESCRIPTION="GNU regular expression matcher"
+HOMEPAGE="https://www.gnu.org/software/grep/"
+
+if [[ ${PV} == *_p* ]] ; then
+	# Subscribe to the 'platform-testers' ML to find these.
+	# Useful to test on our especially more niche arches and report issues upstream.
+	MY_COMMIT="98-c9ac"
+	MY_P=${PN}-$(ver_cut 1-2).${MY_COMMIT}
+	SRC_URI="https://meyering.net/${PN}/${MY_P}.tar.xz"
+	SRC_URI+=" verify-sig? ( https://meyering.net/${PN}/${MY_P}.tar.xz.sig )"
+	S="${WORKDIR}"/${MY_P}
+else
+	SRC_URI="mirror://gnu/${PN}/${P}.tar.xz"
+	SRC_URI+=" verify-sig? ( mirror://gnu/${PN}/${P}.tar.xz.sig )"
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~x64-cygwin ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+fi
+
+LICENSE="GPL-3+"
+SLOT="0"
+IUSE="+egrep-fgrep nls pcre static"
+
+# We lack dev-libs/libsigsegv[static-libs] for now
+REQUIRED_USE="static? ( !sparc )"
+
+LIB_DEPEND="pcre? ( >=dev-libs/libpcre2-7.8-r1[static-libs(+)] )
+	sparc? ( dev-libs/libsigsegv )"
+RDEPEND="!static? ( ${LIB_DEPEND//\[static-libs(+)]} )
+	nls? ( virtual/libintl )
+	virtual/libiconv"
+DEPEND="${RDEPEND}
+	static? ( ${LIB_DEPEND} )"
+BDEPEND="virtual/pkgconfig
+	nls? ( sys-devel/gettext )
+	verify-sig? ( sec-keys/openpgp-keys-grep )"
+
+DOCS=( AUTHORS ChangeLog NEWS README THANKS TODO )
+
+src_prepare() {
+	default
+
+	# bug #523898
+	sed -i \
+		-e "s:@SHELL@:${EPREFIX}/bin/sh:g" \
+		-e "s:@grep@:${EPREFIX}/bin/grep:" \
+		src/egrep.sh || die
+}
+
+src_configure() {
+	use static && append-ldflags -static
+
+	# We used to turn this off unconditionally (bug #673524) but we now
+	# allow it for cases where libsigsegv is better for userspace handling
+	# of stack overflows.
+	# In particular, it's necessary for sparc: bug #768135
+	export ac_cv_libsigsegv=$(usex sparc)
+
+	local myeconfargs=(
+		--bindir="${EPREFIX}"/bin
+		$(use_enable nls)
+		$(use_enable pcre perl-regexp)
+	)
+
+	econf "${myeconfargs[@]}"
+}
+
+src_install() {
+	default
+
+	if use egrep-fgrep ; then
+		# Delete the upstream wrapper variants which warn on egrep+fgrep use
+		rm "${ED}"/bin/{egrep,fgrep} || die
+
+		into /
+		# Install egrep, fgrep which don't warn.
+		#
+		# We do this by default to avoid breakage in old scripts
+		# and such which don't expect unexpected output on stderr,
+		# we've had examples of builds failing because foo-config
+		# starts returning a warning.
+		#
+		# https://lists.gnu.org/archive/html/bug-grep/2022-10/msg00000.html
+		newbin - egrep <<-EOF
+		#!/usr/bin/env sh
+		exec "${EPREFIX}/bin/grep" -E "\$@"
+		EOF
+
+		newbin - fgrep <<-EOF
+		#!/usr/bin/env sh
+		exec "${EPREFIX}/bin/grep" -F "\$@"
+		EOF
+	fi
+}