sys-fs/mdadm: various build fixes

- Fix udev automagic dependency (add USE=udev);

- ... and fix building without udev too.

- Add patch to fix static linking against udev (only option is
  sys-fs/eudev though, as we dropped static-libs from sys-fs/udev
  and sys-apps/systemd due to issues like this and upstream not
  supporting it).

Thanks-to: Hank Leininger <hlein@korelogic.com> (static linking patch)
Thanks-to: Krzysztof Olędzki <ole+gentoo@ans.pl> (udev report/fix)
Closes: https://bugs.gentoo.org/830461
Closes: https://bugs.gentoo.org/830485
Signed-off-by: Sam James <sam@gentoo.org>

2 files changed, 141 insertions, 0 deletions

diff --git a/sys-fs/mdadm/files/mdadm-4.2-in_initrd-collision.patch b/sys-fs/mdadm/files/mdadm-4.2-in_initrd-collision.patch
new file mode 100644
index 000000000000..689e7d698788
--- /dev/null
+++ b/sys-fs/mdadm/files/mdadm-4.2-in_initrd-collision.patch
@@ -0,0 +1,36 @@
+Fix collision with libudev symbols when statically linking.
+
+https://bugs.gentoo.org/830485
+--- a/mdadm.h
++++ b/mdadm.h
+@@ -1665,7 +1665,7 @@
+ extern void udev_block(char *devnm);
+ extern void udev_unblock(void);
+ 
+-extern int in_initrd(void);
++extern int mdadm_in_initrd(void);
+ 
+ struct cmap_hooks {
+ 	void *cmap_handle;      /* corosync lib related */
+--- a/mdmon.c
++++ b/mdmon.c
+@@ -309,7 +309,7 @@
+ 		{NULL, 0, NULL, 0}
+ 	};
+ 
+-	if (in_initrd()) {
++	if (mdadm_in_initrd()) {
+ 		/*
+ 		 * set first char of argv[0] to @. This is used by
+ 		 * systemd to signal that the task was launched from
+--- a/util.c
++++ b/util.c
+@@ -2219,7 +2219,7 @@
+ 	return 0;
+ }
+ 
+-int in_initrd(void)
++int mdadm_in_initrd(void)
+ {
+ 	/* This is based on similar function in systemd. */
+ 	struct statfs s;
diff --git a/sys-fs/mdadm/mdadm-4.2-r1.ebuild b/sys-fs/mdadm/mdadm-4.2-r1.ebuild
new file mode 100644
index 000000000000..0a79356c4210
--- /dev/null
+++ b/sys-fs/mdadm/mdadm-4.2-r1.ebuild
@@ -0,0 +1,105 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit flag-o-matic systemd toolchain-funcs udev
+
+DESCRIPTION="Tool for running RAID systems - replacement for the raidtools"
+HOMEPAGE="https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/"
+DEB_PF="4.2~rc2-7"
+SRC_URI="https://www.kernel.org/pub/linux/utils/raid/mdadm/${P/_/-}.tar.xz
+		mirror://debian/pool/main/m/mdadm/${PN}_${DEB_PF}.debian.tar.xz"
+
+LICENSE="GPL-2"
+SLOT="0"
+[[ "${PV}" = *_rc* ]] || \
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~mips ~ppc ~ppc64 ~riscv ~sparc ~x86"
+IUSE="static +udev"
+
+BDEPEND="app-arch/xz-utils
+	virtual/pkgconfig"
+DEPEND="udev? (
+		static? ( sys-fs/eudev[static-libs] )
+		!static? ( virtual/libudev:= )
+	)"
+RDEPEND=">=sys-apps/util-linux-2.16
+	udev? ( !static? ( virtual/libudev:= ) )"
+DEPEND="${RDEPEND}"
+
+# The tests edit values in /proc and run tests on software raid devices.
+# Thus, they shouldn't be run on systems with active software RAID devices.
+RESTRICT="test"
+
+PATCHES=(
+	"${FILESDIR}/${PN}"-3.4-sysmacros.patch #580188
+	"${FILESDIR}/${PN}"-4.2-in_initrd-collision.patch #830461
+)
+
+mdadm_emake() {
+	# We should probably make corosync & libdlm into USE flags. #573782
+	local args=(
+		PKG_CONFIG="$(tc-getPKG_CONFIG)"
+		CC="$(tc-getCC)"
+		CWFLAGS="-Wall"
+		CXFLAGS="${CFLAGS}"
+		UDEVDIR="$(get_udevdir)"
+		SYSTEMD_DIR="$(systemd_get_systemunitdir)"
+		COROSYNC="-DNO_COROSYNC"
+		DLM="-DNO_DLM"
+
+		# https://bugs.gentoo.org/732276
+		STRIP=
+
+		"$@"
+	)
+	emake "${args[@]}"
+}
+
+src_compile() {
+	use static && append-ldflags -static
+
+	# CPPFLAGS won't work for this
+	use udev || append-cflags -DNO_LIBUDEV
+
+	mdadm_emake all
+}
+
+src_test() {
+	mdadm_emake test
+
+	sh ./test || die
+}
+
+src_install() {
+	mdadm_emake DESTDIR="${D}" install install-systemd
+	dodoc ChangeLog INSTALL TODO README* ANNOUNCE-*
+
+	insinto /etc
+	newins mdadm.conf-example mdadm.conf
+	newinitd "${FILESDIR}"/mdadm.rc mdadm
+	newconfd "${FILESDIR}"/mdadm.confd mdadm
+	newinitd "${FILESDIR}"/mdraid.rc mdraid
+	newconfd "${FILESDIR}"/mdraid.confd mdraid
+
+	# From the Debian patchset
+	into /usr
+	dodoc "${WORKDIR}"/debian/README.checkarray
+	dosbin "${WORKDIR}"/debian/checkarray
+	insinto /etc/default
+	newins "${FILESDIR}"/etc-default-mdadm mdadm
+
+	exeinto /etc/cron.weekly
+	newexe "${FILESDIR}"/mdadm.weekly mdadm
+}
+
+pkg_postinst() {
+	if ! systemd_is_booted; then
+		if [[ -z ${REPLACING_VERSIONS} ]] ; then
+			# Only inform people the first time they install.
+			elog "If you're not relying on kernel auto-detect of your RAID"
+			elog "devices, you need to add 'mdraid' to your 'boot' runlevel:"
+			elog "	rc-update add mdraid boot"
+		fi
+	fi
+}