Fix some shellcheck warnings

Note: This does not modify the configure script, which is a source of a
lot of the remaining shellcheck warnings, because it comes from autoconf
and so it makes little sense to try to fix it here.

Also, it does not modify the scripts in contrib, because they possibly
are maintained at some other place. Similarly with the other scripts
that don't appear to be called from any of the makefiles.

6 files changed, 37 insertions, 37 deletions

diff --git a/gcov.sh b/gcov.sh
index 65f06a4d4..a9d30b676 100755
--- a/gcov.sh
+++ b/gcov.sh
@@ -4,7 +4,7 @@
 # License GPL v2
 
 gcov_init() {
-        USER=`whoami`
+        USER="$(whoami)"
         firejail --help > /dev/null
         firemon --help > /dev/null
         /usr/lib/firejail/fnet --help > /dev/null
@@ -20,7 +20,7 @@ gcov_init() {
         /usr/lib/firejail/faudit --help > /dev/null
         /usr/lib/firejail/fbuilder --help > /dev/null
 
-        sudo chown $USER:$USER `find .`
+        find . -exec sudo chown "$USER:$USER" '{}' +
 }
 
 generate() {
@@ -28,7 +28,7 @@ generate() {
         lcov --add-tracefile gcov-file-old --add-tracefile gcov-file-new  --output-file gcov-file
         rm -fr gcov-dir
         genhtml -q gcov-file --output-directory gcov-dir
-        sudo rm `find . -name *.gcda`
+        find . -name '*.gcda' -exec sudo rm '{}' +
         cp gcov-file gcov-file-old
         gcov_init
 }
diff --git a/linecnt.sh b/linecnt.sh
index ccce2da82..37b4f2a65 100755
--- a/linecnt.sh
+++ b/linecnt.sh
@@ -4,7 +4,7 @@
 # License GPL v2
 
 gcov_init() {
-        USER=`whoami`
+        USER="$(whoami)"
         firejail --help > /dev/null
         firemon --help > /dev/null
         /usr/lib/firejail/fnet --help > /dev/null
@@ -20,7 +20,7 @@ gcov_init() {
         /usr/lib/firejail/faudit --help > /dev/null
         /usr/lib/firejail/fbuilder --help > /dev/null
 
-        sudo chown $USER:$USER `find .`
+        find . -exec sudo chown "$USER:$USER" '{}' +
 }
 
 rm -fr gcov-dir
diff --git a/mkasc.sh b/mkasc.sh
index 31c3f4ffd..b41585460 100755
--- a/mkasc.sh
+++ b/mkasc.sh
@@ -5,9 +5,9 @@
 
 echo "Calculating SHA256 for all files in /transfer - firejail version $1"
 
-cd /transfer
-sha256sum * > firejail-$1-unsigned
-gpg --clearsign --digest-algo SHA256 < firejail-$1-unsigned > firejail-$1.asc
-gpg --verify firejail-$1.asc
-gpg --detach-sign --armor firejail-$1.tar.xz
-rm firejail-$1-unsigned
+cd /transfer || exit 1
+sha256sum ./* > "firejail-$1-unsigned"
+gpg --clearsign --digest-algo SHA256 < "firejail-$1-unsigned" > "firejail-$1.asc"
+gpg --verify "firejail-$1.asc"
+gpg --detach-sign --armor "firejail-$1.tar.xz"
+rm "firejail-$1-unsigned"
diff --git a/mkdeb.sh.in b/mkdeb.sh.in
index e45acf8eb..ddd6ca1ee 100755
--- a/mkdeb.sh.in
+++ b/mkdeb.sh.in
@@ -22,7 +22,7 @@ if [ -n "$HAVE_SELINUX" ]; then
     CONFIG_ARGS="$CONFIG_ARGS --enable-selinux"
 fi
 
-TOP=`pwd`
+TOP="$PWD"
 CODE_ARCHIVE="$NAME-$VERSION.tar.xz"
 CODE_DIR="$NAME-$VERSION"
 INSTALL_DIR="${INSTALL_DIR}${CODE_DIR}/debian"
@@ -35,9 +35,9 @@ echo "install directory: $INSTALL_DIR"
 echo "debian control directory: $DEBIAN_CTRL_DIR"
 echo "*****************************************"
 
-tar -xJvf $CODE_ARCHIVE
-#mkdir -p $INSTALL_DIR
-cd $CODE_DIR
+tar -xJvf "$CODE_ARCHIVE"
+#mkdir -p "$INSTALL_DIR"
+cd "$CODE_DIR"
 ./configure $CONFIG_ARGS
 make -j2
 mkdir debian
@@ -45,26 +45,26 @@ DESTDIR=debian make install-strip
 
 cd ..
 echo "*****************************************"
-SIZE=`du -s $INSTALL_DIR`
+SIZE="$(du -s "$INSTALL_DIR")"
 echo "install size $SIZE"
 echo "*****************************************"
 
-mv $INSTALL_DIR/usr/share/doc/firejail/RELNOTES $INSTALL_DIR/usr/share/doc/firejail/changelog.Debian
-gzip -9 -n $INSTALL_DIR/usr/share/doc/firejail/changelog.Debian
-rm $INSTALL_DIR/usr/share/doc/firejail/COPYING
-install -m644 $CODE_DIR/platform/debian/copyright $INSTALL_DIR/usr/share/doc/firejail/.
-mkdir -p $DEBIAN_CTRL_DIR
-sed "s/FIREJAILVER/$VERSION/g"  $CODE_DIR/platform/debian/control.$(dpkg-architecture -qDEB_HOST_ARCH) > $DEBIAN_CTRL_DIR/control
+mv "$INSTALL_DIR/usr/share/doc/firejail/RELNOTES" "$INSTALL_DIR/usr/share/doc/firejail/changelog.Debian"
+gzip -9 -n "$INSTALL_DIR/usr/share/doc/firejail/changelog.Debian"
+rm "$INSTALL_DIR/usr/share/doc/firejail/COPYING"
+install -m644 "$CODE_DIR/platform/debian/copyright" "$INSTALL_DIR/usr/share/doc/firejail/."
+mkdir -p "$DEBIAN_CTRL_DIR"
+sed "s/FIREJAILVER/$VERSION/g" "$CODE_DIR/platform/debian/control.$(dpkg-architecture -qDEB_HOST_ARCH)" > "$DEBIAN_CTRL_DIR/control"
 
-mkdir -p $INSTALL_DIR/usr/share/lintian/overrides/
-install -m644 $CODE_DIR/platform/debian/firejail.lintian-overrides $INSTALL_DIR/usr/share/lintian/overrides/firejail
+mkdir -p "$INSTALL_DIR/usr/share/lintian/overrides/"
+install -m644 "$CODE_DIR/platform/debian/firejail.lintian-overrides" "$INSTALL_DIR/usr/share/lintian/overrides/firejail"
 
-find $INSTALL_DIR/etc -type f | sed "s,^$INSTALL_DIR,," | LC_ALL=C sort > $DEBIAN_CTRL_DIR/conffiles
-chmod 644 $DEBIAN_CTRL_DIR/conffiles
-find $INSTALL_DIR  -type d | xargs chmod 755
-cd $CODE_DIR
+find "$INSTALL_DIR/etc" -type f | sed "s,^$INSTALL_DIR,," | LC_ALL=C sort > "$DEBIAN_CTRL_DIR/conffiles"
+chmod 644 "$DEBIAN_CTRL_DIR/conffiles"
+find "$INSTALL_DIR" -type d -exec chmod 755 '{}' +
+cd "$CODE_DIR"
 fakeroot dpkg-deb --build debian
 lintian --no-tag-display-limit debian.deb
-mv debian.deb ../firejail_${VERSION}${EXTRA_VERSION}_1_$(dpkg-architecture -qDEB_HOST_ARCH).deb
+mv debian.deb "../firejail_${VERSION}${EXTRA_VERSION}_1_$(dpkg-architecture -qDEB_HOST_ARCH).deb"
 cd ..
-rm -fr $CODE_DIR
+rm -fr "$CODE_DIR"
diff --git a/mkman.sh b/mkman.sh
index 8767972d1..c9606c1e7 100755
--- a/mkman.sh
+++ b/mkman.sh
@@ -5,8 +5,8 @@
 
 set -e
 
-sed "s/VERSION/$1/g" $2 > $3
-MONTH=`LC_ALL=C date -u --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%b`
-sed -i "s/MONTH/$MONTH/g" $3
-YEAR=`LC_ALL=C date -u --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%Y`
-sed -i "s/YEAR/$YEAR/g" $3
+sed "s/VERSION/$1/g" "$2" > "$3"
+MONTH="$(LC_ALL=C date -u --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%b)"
+sed -i "s/MONTH/$MONTH/g" "$3"
+YEAR="$(LC_ALL=C date -u --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%Y)"
+sed -i "s/YEAR/$YEAR/g" "$3"
diff --git a/mkuid.sh b/mkuid.sh
index 0264628cc..47aa42acd 100755
--- a/mkuid.sh
+++ b/mkuid.sh
@@ -9,8 +9,8 @@ echo "#define FIREJAIL_UIDS_H" >> uids.h
 
 if [ -r /etc/login.defs ]
 then
-        UID_MIN=`awk '/^\s*UID_MIN\s*([0-9]*).*?$/ {print $2}' /etc/login.defs`
-        GID_MIN=`awk '/^\s*GID_MIN\s*([0-9]*).*?$/ {print $2}' /etc/login.defs`
+        UID_MIN="$(awk '/^\s*UID_MIN\s*([0-9]*).*?$/ {print $2}' /etc/login.defs)"
+        GID_MIN="$(awk '/^\s*GID_MIN\s*([0-9]*).*?$/ {print $2}' /etc/login.defs)"
 fi
 
 # use default values if not found