make deb-utils fails when there is a whitespace in the existing $PATH environment variable

[martin-rueegg]

System information

Type	Version/Name
Distribution Name	Ubuntu
Distribution Version	20.04.5 LTS (focal)
Kernel Version	5.10.16.3-microsoft-standard-WSL2+
Architecture	x86
OpenZFS Version	zfs-2.1.0-rc4, zfs-kmod-2.1.0-rc4

Describe the problem you're observing

When trying to build the deb tools with make -j1 deb-utils the build fails with the following error: env: ‘Files’: No such file or directory

Describe how to reproduce the problem

WSL_KERNEL_SOURCE_DIR=../kernel
sh autogen.sh
./configure --prefix=/ --libdir=/lib --includedir=/usr/include --datarootdir=/usr/share --enable-linux-builtin=yes \
 --with-linux=$WSL_KERNEL_SOURCE_DIR --with-linux-obj=$WSL_KERNEL_SOURCE_DIR --enable-systemd
./copy-builtin $WSL_KERNEL_SOURCE_DIR
make -j8
make -j1 deb-utils

Include any warning/errors/backtraces from the system logs

name=zfs; \
version=2.1.0-rc4; \
arch=`rpm -qp ${name}-${version}.src.rpm --qf %{arch} | tail -1`; \
debarch=`dpkg --print-architecture`; \
pkg1=${name}-${version}.${arch}.rpm; \
pkg2=libnvpair3-${version}.${arch}.rpm; \
pkg3=libuutil3-${version}.${arch}.rpm; \
pkg4=libzfs5-${version}.${arch}.rpm; \
pkg5=libzpool5-${version}.${arch}.rpm; \
pkg6=libzfs5-devel-${version}.${arch}.rpm; \
pkg7=${name}-test-${version}.${arch}.rpm; \
pkg8=${name}-dracut-${version}.noarch.rpm; \
pkg9=${name}-initramfs-${version}.${arch}.rpm; \
pkg10=`ls python*-pyzfs-${version}* | tail -1`; \
path_prepend=`mktemp -d /tmp/intercept.XXXXXX`; \
echo "#!/bin/bash" > ${path_prepend}/dh_shlibdeps; \
echo "`which dh_shlibdeps` -- \
 -xlibuutil3linux -xlibnvpair3linux -xlibzfs5linux -xlibzpool5linux" \
 >> ${path_prepend}/dh_shlibdeps; \
chmod +x ${path_prepend}/dh_shlibdeps; \
env PATH=${path_prepend}:${PATH} \
fakeroot alien --bump=0 --scripts --to-deb --target=$debarch \
    $pkg1 $pkg2 $pkg3 $pkg4 $pkg5 $pkg6 $pkg7 \
    $pkg8 $pkg9 $pkg10 || exit 1; \
rm -f ${path_prepend}/dh_shlibdeps; \
rmdir ${path_prepend}; \
rm -f $pkg1 $pkg2 $pkg3 $pkg4 $pkg5 $pkg6 $pkg7 \
    $pkg8 $pkg9 $pkg10;
env: ‘Files’: No such file or directory
make: *** [Makefile:1726: deb-utils] Error 1