From: Luke Shumaker <[email protected]>

Even though main() doesn't call `set -u`; this way the functions will
continue to work if copied into an environment with `set -u`, or so
that we are ready if we ever want to start using `set -u`.
---
 makechrootpkg.in | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/makechrootpkg.in b/makechrootpkg.in
index bdcaa88..f22fe49 100644
--- a/makechrootpkg.in
+++ b/makechrootpkg.in
@@ -32,7 +32,7 @@ bindmounts_ro=()
 bindmounts_rw=()
 
 copy=$USER
-[[ -n $SUDO_USER ]] && copy=$SUDO_USER
+[[ -n ${SUDO_USER:-} ]] && copy=$SUDO_USER
 [[ -z "$copy" || $copy = root ]] && copy=copy
 src_owner=${SUDO_USER:-$USER}
 
@@ -90,7 +90,7 @@ load_vars() {
        [[ -f $makepkg_conf ]] || return 1
 
        for var in {SRC,SRCPKG,PKG,LOG}DEST MAKEFLAGS PACKAGER; do
-               [[ -z ${!var} ]] && eval $(grep "^${var}=" "$makepkg_conf")
+               [[ -z ${!var:-} ]] && eval $(grep "^${var}=" "$makepkg_conf")
        done
 
        return 0
@@ -209,7 +209,7 @@ prepare_chroot() {
 
        sed -e '/^MAKEFLAGS=/d' -e '/^PACKAGER=/d' -i 
"$copydir/etc/makepkg.conf"
        for x in BUILDDIR=/build PKGDEST=/pkgdest SRCPKGDEST=/srcpkgdest 
SRCDEST=/srcdest LOGDEST=/logdest \
-               "MAKEFLAGS='$MAKEFLAGS'" "PACKAGER='$PACKAGER'"
+               "MAKEFLAGS='${MAKEFLAGS:-}'" "PACKAGER='${PACKAGER:-}'"
        do
                grep -q "^$x" "$copydir/etc/makepkg.conf" && continue
                echo "$x" >>"$copydir/etc/makepkg.conf"
@@ -384,7 +384,7 @@ $update_first && arch-nspawn "$copydir" \
                "${bindmounts_ro[@]}" "${bindmounts_rw[@]}" \
                pacman -Syu --noconfirm
 
-if [[ -n ${install_pkgs[*]} ]]; then
+if [[ -n ${install_pkgs[*]:-} ]]; then
        install_packages "$copydir" "${install_pkgs[@]}"
        ret=$?
        # If there is no PKGBUILD we have done
-- 
2.12.1

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