[Bug] Fix broken install script after #1053.

We now stop using 3rd party tool, only rely on bash and python3.

scripts/gef.sh

@@ -2,16 +2,9 @@
 
 set -e
 
-curl_found=0
-wget_found=0
-
 # check dependencies
-if [ "$(command -v curl)" ]; then
- curl_found=1
-elif [ "$(command -v wget)" ]; then
- wget_found=1
-else
- echo "The installer requires cURL or wget installed."
+if [ ! "$(command -v python3)" ]; then
+ echo "GEF requires Python3 installed."
  exit 1
 fi
 
@@ -20,24 +13,13 @@ if [ -f "${HOME}/.gdbinit" ]; then
  mv "${HOME}/.gdbinit" "${HOME}/.gdbinit.old"
 fi
 
-if [ $wget_found -eq 1 ]; then
- # Get the tag of the latest stable
- tag=$(wget -q -O- "https://api.github.com/repos/hugsy/gef/tags" | grep "name" | head -1 | sed -e 's/"name": "\([^"]*\)",/\1/' -e 's/ *//')
-
- # Download the file
- wget -q "https://github.com/hugsy/gef/raw/${tag}/gef.py" -O "${HOME}/.gef-${tag}.py"
-elif [ $curl_found -eq 1 ]; then
- # Get the tag of the latest stable
- tag=$(curl -s "https://api.github.com/repos/hugsy/gef/tags" | grep "name" | head -1 | sed -e 's/"name": "\([^"]*\)",/\1/' -e 's/ *//')
-
- # Download the file
- curl --silent --location --output "${HOME}/.gef-${tag}.py" "https://github.com/hugsy/gef/raw/${tag}/gef.py"
-fi
+tag=$(python3 -c 'import urllib.request as r,json as j; x=j.loads(r.urlopen("https://api.github.com/repos/hugsy/gef/tags").read()); print(x[0]["name"])')
+python3 -c "import urllib.request as r; x=r.urlopen('https://github.com/hugsy/gef/raw/${tag}/gef.py').read(); print(x.decode('utf-8'))" > ${HOME}/.gef-${tag}.py
 
 if [ -f "${HOME}/.gef-${tag}.py" ]; then
  echo "source ~/.gef-${tag}.py" > ~/.gdbinit
  exit 0
 else
  echo "GEF was not properly downloaded"
- exit 1
+ exit 2
 fi