build: do not hardcode paths outside of $prefix

config/mount-helper.m4

@@ -1,8 +1,8 @@
 AC_DEFUN([ZFS_AC_CONFIG_USER_MOUNT_HELPER], [
 	AC_ARG_WITH(mounthelperdir,
 		AS_HELP_STRING([--with-mounthelperdir=DIR],
-		[install mount.zfs in dir [[/sbin]]]),
-		mounthelperdir=$withval,mounthelperdir=/sbin)
+		[install mount.zfs in dir [[$sbindir]]]),
+		mounthelperdir=$withval,mounthelperdir=$sbindir)
 
 	AC_SUBST(mounthelperdir)
 ])

config/user-dracut.m4

@@ -1,18 +1,23 @@
 AC_DEFUN([ZFS_AC_CONFIG_USER_DRACUT], [
-	AC_MSG_CHECKING(for dracut directory)
+	AC_MSG_CHECKING(for dracut directory XXX prefix=$prefix adp=$ac_default_prefix XXX)
 	AC_ARG_WITH([dracutdir],
 		AS_HELP_STRING([--with-dracutdir=DIR],
 		[install dracut helpers @<:@default=check@:>@]),
 		[dracutdir=$withval],
 		[dracutdir=check])
 
 	AS_IF([test "x$dracutdir" = xcheck], [
-		path1=/usr/share/dracut
-		path2=/usr/lib/dracut
-		default=$path2
+		AS_IF([test "$prefix" != "NONE"],
+			[tprefix="$prefix"],
+			[tprefix="$ac_default_prefix"]
+		)
 
-		AS_IF([test -d "$path1"], [dracutdir="$path1"], [
-			AS_IF([test -d "$path2"], [dracutdir="$path2"],
+		path1='$prefix/share/dracut'
+		path2='$prefix/lib/dracut'
+		default="$path2"
+
+		AS_IF([test -d "$tprefix/share/dracut"], [dracutdir="$path1"], [
+			AS_IF([test -d "$tprefix/lib/dracut"], [dracutdir="$path2"],
 				[dracutdir="$default"])
 		])
 	])

config/user-systemd.m4

@@ -7,23 +7,23 @@ AC_DEFUN([ZFS_AC_CONFIG_USER_SYSTEMD], [
 
 	AC_ARG_WITH(systemdunitdir,
 		AS_HELP_STRING([--with-systemdunitdir=DIR],
-		[install systemd unit files in dir [[/usr/lib/systemd/system]]]),
-		systemdunitdir=$withval,systemdunitdir=/usr/lib/systemd/system)
+		[install systemd unit files in dir [[$libdir/systemd/system]]]),
+		systemdunitdir=$withval,systemdunitdir=$libdir/systemd/system)
 
 	AC_ARG_WITH(systemdpresetdir,
 		AS_HELP_STRING([--with-systemdpresetdir=DIR],
-		[install systemd preset files in dir [[/usr/lib/systemd/system-preset]]]),
-		systemdpresetdir=$withval,systemdpresetdir=/usr/lib/systemd/system-preset)
+		[install systemd preset files in dir [[$libdir/systemd/system-preset]]]),
+		systemdpresetdir=$withval,systemdpresetdir=$libdir/systemd/system-preset)
 
 	AC_ARG_WITH(systemdmodulesloaddir,
 		AS_HELP_STRING([--with-systemdmodulesloaddir=DIR],
-		[install systemd module load files into dir [[/usr/lib/modules-load.d]]]),
-		systemdmodulesloaddir=$withval,systemdmodulesloaddir=/usr/lib/modules-load.d)
+		[install systemd module load files into dir [[$libdir/modules-load.d]]]),
+		systemdmodulesloaddir=$withval,systemdmodulesloaddir=$libdir/modules-load.d)
 
 	AC_ARG_WITH(systemdgeneratordir,
 		AS_HELP_STRING([--with-systemdgeneratordir=DIR],
-		[install systemd generators in dir [[/usr/lib/systemd/system-generators]]]),
-		systemdgeneratordir=$withval,systemdgeneratordir=/usr/lib/systemd/system-generators)
+		[install systemd generators in dir [[$libdir/systemd/system-generators]]]),
+		systemdgeneratordir=$withval,systemdgeneratordir=$libdir/systemd/system-generators)
 
 	AS_IF([test "x$enable_systemd" = xcheck], [
 		AS_IF([systemctl --version >/dev/null 2>&1],

config/user-udev.m4

@@ -1,20 +1,26 @@
 AC_DEFUN([ZFS_AC_CONFIG_USER_UDEV], [
-	AC_MSG_CHECKING(for udev directories)
+	PKG_CHECK_MODULES([UDEV], [udev], [have_udev=yes], [have_udev=no])
+
+	AC_MSG_CHECKING(for udev directories XXX $prefix XXX)
 	AC_ARG_WITH(udevdir,
 		AS_HELP_STRING([--with-udevdir=DIR],
 		[install udev helpers @<:@default=check@:>@]),
 		[udevdir=$withval],
 		[udevdir=check])
 
 	AS_IF([test "x$udevdir" = xcheck], [
-		path1=/lib/udev
-		path2=/usr/lib/udev
-		default=$path2
+		AS_IF([test "x$prefix" != "xNONE"],
+			[tprefix="$prefix"],
+			[tprefix="$ac_default_prefix"]
+		)
 
-		AS_IF([test -d "$path1"], [udevdir="$path1"], [
-			AS_IF([test -d "$path2"], [udevdir="$path2"],
-				[udevdir="$default"])
-		])
+		AS_IF([test "x$tprefix" = "x/usr"], [
+			AS_IF([test "x${have_udev}" = xyes],
+				[udevdir=`$PKG_CONFIG --variable=udevdir udev`],
+				AS_IF([test -d '/lib/udev' -a ! -L '/lib'],
+					[udevdir="/lib/udev"],
+					[udevdir="/usr/lib/udev"]))
+		], [udevdir='${prefix}/lib/udev'])
 	])
 
 	AC_ARG_WITH(udevruledir,

config/zfs-build.m4

@@ -644,24 +644,24 @@ AC_DEFUN([ZFS_AC_DEFAULT_PACKAGE], [
 	AC_MSG_CHECKING([default init config directory])
 	case "$VENDOR" in
 		alpine|artix|gentoo)
-			initconfdir=/etc/conf.d
+			initconfdir=$sysconfdir/conf.d
 			;;
 		fedora|openeuler|redhat|sles|toss)
-			initconfdir=/etc/sysconfig
+			initconfdir=$sysconfdir/sysconfig
 			;;
 		freebsd)
 			initconfdir=$sysconfdir/rc.conf.d
 			;;
 		*)
 		# debian|ubuntu
-			initconfdir=/etc/default
+			initconfdir=$sysconfdir/default
 			;;
 	esac
 	AC_MSG_RESULT([$initconfdir])
 	AC_SUBST(initconfdir)
 
 	AC_MSG_CHECKING([whether initramfs-tools is available])
-	if test -d /usr/share/initramfs-tools ; then
+	if test -d $datarootdir/initramfs-tools ; then
 		RPM_DEFINE_INITRAMFS='--define "_initramfs 1"'
 		AC_MSG_RESULT([yes])
 	else
@@ -673,13 +673,13 @@ AC_DEFUN([ZFS_AC_DEFAULT_PACKAGE], [
 	AC_MSG_CHECKING([default bash completion directory])
 	case "$VENDOR" in
 		alpine|arch|artix|debian|gentoo|ubuntu)
-			bashcompletiondir=/usr/share/bash-completion/completions
+			bashcompletiondir=$datarootdir/bash-completion/completions
 			;;
 		freebsd)
 			bashcompletiondir=$sysconfdir/bash_completion.d
 			;;
 		*)
-			bashcompletiondir=/etc/bash_completion.d
+			bashcompletiondir=$sysconfdir/bash_completion.d
 			;;
 	esac
 	AC_MSG_RESULT([$bashcompletiondir])

contrib/initramfs/Makefile.am

@@ -1,4 +1,4 @@
-i_tdir = /usr/share/initramfs-tools
+i_tdir = $(datarootdir)/initramfs-tools
 dist_i_t_SCRIPTS = \
 	%D%/zfsunlock