diff --git a/gitstatus.plugin.sh b/gitstatus.plugin.sh
index 9a75cb5f..0c660967 100644
--- a/gitstatus.plugin.sh
+++ b/gitstatus.plugin.sh
@@ -53,9 +53,8 @@ function gitstatus_start() {
   fi
 
   unset OPTIND
-  local opt timeout=5 max_dirty=-1 ttl=3600 extra_flags
+  local opt timeout=5 max_dirty=-1 ttl=3600 extra_flags=
   local max_num_staged=1 max_num_unstaged=1 max_num_conflicted=1 max_num_untracked=1
-  local ignore_status_show_untracked_files
   while getopts "t:s:u:c:d:m:r:eUWD" opt; do
     case "$opt" in
       t) timeout=$OPTARG;;
@@ -356,7 +355,7 @@ function gitstatus_stop() {
 # shell or the call had failed.
 function gitstatus_query() {
   unset OPTIND
-  local opt dir timeout=() no_diff=0
+  local opt dir= timeout=() no_diff=0
   while getopts "d:c:t:p" opt "$@"; do
     case "$opt" in
       d) dir=$OPTARG;;
@@ -367,7 +366,7 @@ function gitstatus_query() {
   done
   (( OPTIND == $# + 1 )) || { echo "usage: gitstatus_query [OPTION]..." >&2; return 1; }
 
-  [[ -n "$GITSTATUS_DAEMON_PID" ]] || return  # not started
+  [[ -n "${GITSTATUS_DAEMON_PID-}" ]] || return  # not started
 
   local req_id="$RANDOM.$RANDOM.$RANDOM.$RANDOM"
   if [[ -z "${GIT_DIR:-}" ]]; then
diff --git a/install b/install
index 981d280a..a0142b2b 100755
--- a/install
+++ b/install
@@ -304,27 +304,29 @@ END
         local data_file="$tmpdir"/"$1".tar.gz
         local hash_file="$tmpdir"/"$1".tar.gz.sha256
         local hash=
-        if command -v shasum >/dev/null 2>/dev/null; then
-          if run_cmd shasum -b -a 256 -- "$data_file" >"$hash_file"; then
-            IFS= read -r hash <"$hash_file" || hash=
-            hash="${hash%% *}"
-          fi
-        elif command -v sha256sum >/dev/null 2>/dev/null; then
-          if run_cmd sha256sum -b -- "$data_file" >"$hash_file"; then
-            IFS= read -r hash <"$hash_file" || hash=
-            hash="${hash%% *}"
-          fi
-        elif command -v sha256 >/dev/null 2>/dev/null; then
-          if run_cmd sha256 -- "$data_file" </dev/null >"$hash_file"; then
-            IFS= read -r hash <"$hash_file" || hash=
-            # Ignore sha256 output if it's from hashalot. It's incompatible.
-            if [ ${#hash} -lt 64 ]; then
-              hash=
-            else
-              hash="${hash##* }"
-            fi
-          fi
-        fi
+        {
+          command -v shasum >/dev/null 2>/dev/null                            &&
+            run_cmd shasum -b -a 256 -- "$data_file" >"$hash_file" </dev/null &&
+            IFS= read -r hash <"$hash_file"                                   &&
+            hash="${hash%% *}"                                                &&
+            [ ${#hash} -eq 64 ]
+        } || {
+          command -v sha256sum >/dev/null 2>/dev/null                         &&
+            run_cmd sha256sum -b -- "$data_file" >"$hash_file" </dev/null     &&
+            IFS= read -r hash <"$hash_file"                                   &&
+            hash="${hash%% *}"                                                &&
+            [ ${#hash} -eq 64 ]
+        } || {
+          # Note: sha256 can be from hashalot. It's incompatible.
+          # Thankfully, it produces shorter output.
+          command -v sha256 >/dev/null 2>/dev/null &&
+            run_cmd sha256 -- "$data_file" >"$hash_file" </dev/null &&
+            IFS= read -r hash <"$hash_file" &&
+            hash="${hash##* }" &&
+            [ ${#hash} -eq 64 ]
+        } || {
+          hash=
+        }
         [ "$1" = 1 -a -z "$hash" -o "$hash" = "$sha256" ]
       }