deps.sh: skip internal deps install if using non-APT distro

Author: Jean-Lessa

README.md

@@ -80,7 +80,7 @@ The versions of those dependencies should suffice out-of-the-box for at least th
 
 There is a script called `scripts/deps.sh` which you can use to check if you have those dependencies installed (`deps.sh --check`), and install them in case you don't (`deps.sh --install`). The script expects dependencies to be installed either on `/usr` or `/usr/local`, giving preference to the latter if it finds anything there (so you can use a higher version of a dependency while still keeping your distro's default one).
 
-**Please note that installing dependencies through the script only works on APT-based distros** (Debian, Ubuntu and derivatives) - you can still check the dependencies on any distro, but installing them requires APT. For distros with other package managers and/or distros older than the minimum ones listed above, you're on your own.
+**Please note that installing most dependencies through the script only works on APT-based distros** (Debian, Ubuntu and derivatives) - you can still check the dependencies on any distro and install the few ones labeled as "external" (those are fetched through `git`), but if you're on a distro with another package manager and/or a distro older than one of the minimum ones listed above, you're on your own.
 
 ### GCC-specific tips
 

scripts/deps.sh

@@ -139,32 +139,36 @@ elif [ "${1:-}" == "--install" ]; then
     exit
   fi
 
-  # Install binaries and internal libs
-  # TODO: this works on APT distros only for now
-  echo "-- Checking internal dependencies..."
-  PKGS=""
-  if [ -z "$HAS_GIT" ]; then PKGS+="git "; fi
-  if [ -z "$HAS_GCC" ] || [ -z "$HAS_GPP" ] || [ -z "$HAS_MAKE" ] || [ -z "$HAS_LD" ]; then PGKS+="build-essential "; fi
-  if [ -z "$HAS_CMAKE" ]; then PKGS+="cmake "; fi
-  if [ -z "$HAS_TMUX" ]; then PKGS+="tmux "; fi
-  if [ -z "$HAS_PROTOC" ]; then PKGS+="protobuf-compiler "; fi
-  if [ -z "$HAS_GRPC" ]; then PKGS+="protobuf-compiler-grpc "; fi
-  if [ -z "$HAS_NINJA" ]; then PKGS+="ninja-build "; fi
-  if [ -z "$HAS_MOLD" ]; then PKGS+="mold "; fi
-  if [ -z "$HAS_DOXYGEN" ]; then PKGS+="doxygen "; fi
-  if [ -z "$HAS_CLANGTIDY" ]; then PKGS+="clang-tidy "; fi
-  if [ -z "$HAS_BOOST" ]; then PKGS+="libboost-all-dev "; fi
-  if [ -z "$HAS_LIBSSL" ]; then PKGS+="libssl-dev "; fi
-  if [ -z "$HAS_ZSTD" ]; then PKGS+="libzstd-dev "; fi
-  if [ -z "$HAS_LIBCRYPTOPP" ]; then PKGS+="libcrypto++-dev "; fi
-  if [ -z "$HAS_LIBSCRYPT" ]; then PKGS+="libscrypt-dev "; fi
-  if [ -z "$HAS_LIBCARES" ]; then PKGS+="libc-ares-dev "; fi
-  if [ -z "$HAS_LIBGRPC" ]; then PKGS+="libgrpc-dev "; fi
-  if [ -z "$HAS_LIBGRPCPP" ]; then PKGS+="libgrpc++-dev "; fi
-  if [ -z "$HAS_SECP256K1" ]; then PKGS+="libsecp256k1-dev "; fi
-  if [ -n "$PKGS" ]; then
-    echo "-- Installing internal dependencies..."
-    apt-get install -y $PKGS
+  # Install binaries and internal libs (skip if not on an APT-based distro)
+  HAS_APT=$(check_exec apt)
+  if [ -n "$HAS_APT" ]; then
+    echo "-- Checking internal dependencies..."
+    PKGS=""
+    if [ -z "$HAS_GIT" ]; then PKGS+="git "; fi
+    if [ -z "$HAS_GCC" ] || [ -z "$HAS_GPP" ] || [ -z "$HAS_MAKE" ] || [ -z "$HAS_LD" ]; then PGKS+="build-essential "; fi
+    if [ -z "$HAS_CMAKE" ]; then PKGS+="cmake "; fi
+    if [ -z "$HAS_TMUX" ]; then PKGS+="tmux "; fi
+    if [ -z "$HAS_PROTOC" ]; then PKGS+="protobuf-compiler "; fi
+    if [ -z "$HAS_GRPC" ]; then PKGS+="protobuf-compiler-grpc "; fi
+    if [ -z "$HAS_NINJA" ]; then PKGS+="ninja-build "; fi
+    if [ -z "$HAS_MOLD" ]; then PKGS+="mold "; fi
+    if [ -z "$HAS_DOXYGEN" ]; then PKGS+="doxygen "; fi
+    if [ -z "$HAS_CLANGTIDY" ]; then PKGS+="clang-tidy "; fi
+    if [ -z "$HAS_BOOST" ]; then PKGS+="libboost-all-dev "; fi
+    if [ -z "$HAS_LIBSSL" ]; then PKGS+="libssl-dev "; fi
+    if [ -z "$HAS_ZSTD" ]; then PKGS+="libzstd-dev "; fi
+    if [ -z "$HAS_LIBCRYPTOPP" ]; then PKGS+="libcrypto++-dev "; fi
+    if [ -z "$HAS_LIBSCRYPT" ]; then PKGS+="libscrypt-dev "; fi
+    if [ -z "$HAS_LIBCARES" ]; then PKGS+="libc-ares-dev "; fi
+    if [ -z "$HAS_LIBGRPC" ]; then PKGS+="libgrpc-dev "; fi
+    if [ -z "$HAS_LIBGRPCPP" ]; then PKGS+="libgrpc++-dev "; fi
+    if [ -z "$HAS_SECP256K1" ]; then PKGS+="libsecp256k1-dev "; fi
+    if [ -n "$PKGS" ]; then
+      echo "-- Installing internal dependencies..."
+      apt-get install -y $PKGS
+    fi
+  else
+    echo "-- Skipping internal dependencies (non-APT-based distro, please install those manually)"
   fi
 
   # Install external libs