chore: make sh install scripts POSIX compliant (#391)

Author: Arqu

public/doctor.sh

@@ -27,16 +27,19 @@ release_target_url=$(
     sed -re 's/.*: "([^"]+)".*/\1/' \
 )
 
-if [[ "$release_target_url" =~ \.zip$ ]]; then
-    release_archive=$(
-        curl -s "$release_url" |
-        grep "name" |
-        grep "$target" |
-        sed -re 's/.*: "([^"]+)".*/\1/' \
-    )
-    curl -sL "$release_target_url" -o $release_archive
-    unzip -oq $release_archive
-    rm -rf $release_archive
-else
-    curl -sL "$release_target_url" | tar xz
-fi
+case "$release_target_url" in
+    *.zip)
+        release_archive=$(
+            curl -s "$release_url" |
+            grep "name" |
+            grep "$target" |
+            sed -re 's/.*: "([^"]+)".*/\1/' \
+        )
+        curl -sL "$release_target_url" -o $release_archive
+        unzip -oq $release_archive
+        rm -rf $release_archive
+        ;;
+    *)
+        curl -sL "$release_target_url" | tar xz
+        ;;
+esac

public/n0des.sh

@@ -3,9 +3,11 @@
 
 set -e
 
-# Set tag from first argument or default to "latest"
+# Set tag from first argument, environment variable, or default to "latest"
 if [ -n "$1" ]; then
     tag="${1:0:7}"
+elif [ -n "$TAG" ]; then
+    tag="${TAG:0:7}"
 else
     tag="latest"
 fi

public/sendme.sh

@@ -27,16 +27,19 @@ release_target_url=$(
     sed -re 's/.*: "([^"]+)".*/\1/' \
 )
 
-if [[ "$release_target_url" =~ \.zip$ ]]; then
-    release_archive=$(
-        curl -s "$release_url" |
-        grep "name" |
-        grep "$target" |
-        sed -re 's/.*: "([^"]+)".*/\1/' \
-    )
-    curl -sL "$release_target_url" -o $release_archive
-    unzip -oq $release_archive
-    rm -rf $release_archive
-else
-    curl -sL "$release_target_url" | tar xz
-fi
+case "$release_target_url" in
+    *.zip)
+        release_archive=$(
+            curl -s "$release_url" |
+            grep "name" |
+            grep "$target" |
+            sed -re 's/.*: "([^"]+)".*/\1/' \
+        )
+        curl -sL "$release_target_url" -o $release_archive
+        unzip -oq $release_archive
+        rm -rf $release_archive
+        ;;
+    *)
+        curl -sL "$release_target_url" | tar xz
+        ;;
+esac