sh-elf-vhex - v2.0.0-rc6 : rework bootstrap preliminary checks

*update*
> [project]
  | [readme] simplify the curl operation
> [scripts]
  | [bootstrap] allow cloned folder if install aborted
  | [bootstrap] proper check if the project already installed

*fix*
> [scripts]
  | [bootstrap] avoid cloning if uninstall operation
  | [_uninstall] check for executable file instead of simple file
  | [_install]   check for executable file instead of simple file

README.md

@@ -62,7 +62,7 @@ The build is relatively simple and can be done in two different ways:
 
 Using `curl` and `jq`:
 ```bash
-curl 'https://api.github.com/repos/YannMagnin/sh-elf-vhex/contents/scripts/bootstrap.sh' | jq -r '.content' | base64 --decode | bash
+curl -fsSL https://raw.githubusercontent.com/YannMagnin/sh-elf-vhex/HEAD/scripts/bootstrap.sh | bash
 ```
 
 Or by cloning the project and using the `bootstrap.sh` script, see

scripts/_install.sh

@@ -47,7 +47,7 @@ _src=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 cd "$_src" || exit 1
 source ./_utils.sh
 
-if [[ ! -f "$prefix_sysroot/bin/sh-elf-vhex-gcc" ]]
+if [[ ! -x "$prefix_sysroot/bin/sh-elf-vhex-gcc" ]]
 then
   echo "error: Are you sure to have built sh-elf-vhex ? it seems that" >&2
   echo "  the 'sh-elf-vhex-gcc' tool is missing..." >&2

scripts/_uninstall.sh

@@ -52,7 +52,7 @@ then
   exit 1
 fi
 
-if [[ ! -f "$prefix_sysroot/bin/sh-elf-vhex-as" ]]
+if [[ ! -x "$prefix_sysroot/bin/sh-elf-vhex-as" ]]
 then
   echo 'error: Are you sure to have built sh-elf-vhex ?' >&2
   echo '  Missing '\''sh-elf-vhex-as'\'' tool' >&2

scripts/bootstrap.sh

@@ -63,23 +63,38 @@ done
 _src=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 cd "$_src" || exit 1
 
+has_been_cloned='false'
 if [[ "$prefix_clone/scripts" != "$_src" ]]
 then
-  if [[ -d "$prefix_clone" && "$overwrite" != 'true' ]]
+  if [[ "$action" != 'install' ]]; then
+    echo \
+      'No need to uninstall the sh-elf-vhex since no cloned repository' \
+      'has been found, ignored'
+    exit 0
+  fi
+  if [ -x "$prefix_sysroot/bin/sh-elf-vhex-gcc" ]
   then
     echo -e \
-      "It seems that the project is already existing :pouce:\n" \
+      'It seems that the project is already installed :pouce:\n' \
       'If you really want to reinstall this project use the "--overwrite"' \
       'option.'
     exit 1
   fi
-  [[ -d "$prefix_clone" ]] && rm -rf "$prefix_clone"
-  echo '<sh-elf-vhex> self-clone repository...'
-  git \
-    clone \
-    --depth=1 \
-    https://github.com/YannMagnin/sh-elf-vhex.git \
-    "$prefix_clone"
+  if [[ ! -d "$prefix_clone" || "$overwrite" == 'true' ]]
+  then
+    [[ -d "$prefix_clone" ]] && rm -rf "$prefix_clone"
+    echo '<sh-elf-vhex> self-clone repository...'
+    {
+      git \
+        clone \
+        --depth=1 \
+        https://github.com/YannMagnin/sh-elf-vhex.git \
+        "$prefix_clone"
+    } || {
+      exit 1
+    }
+    has_been_cloned='true'
+  fi
 fi
 
 cd "$prefix_clone/scripts" || exit 1
@@ -110,19 +125,21 @@ then
   echo " - Binutils version:      $version_binutils"
   echo " - Clone directory:       $prefix_clone"
   echo " - Compliler install at:  $prefix_install"
+  if [[ "$has_been_cloned" == 'true' ]]; then
+    echo 'Note that the cloned repository will be removed if aborted'
+  fi
   read -p 'Process ? [yN]: ' -r valid < /dev/tty
 else
     read -p 'Uninstall the sh-elf-vhex compiler ? [yN]: ' -r valid < /dev/tty
 fi
 
-# check if the stdin exists, which is not the case when the script is piped
-# with bash (cat ./script/bootstrap.sh | bash)
-if [[ -t 0 ]]
-then
-  if [[ "$valid" != 'y' ]]; then
+if [[ "$valid" != 'y' ]]; then
+  if [[ "$has_been_cloned" == 'true' ]]; then
+    echo 'Removing the cloned repository...'
+    rm -rf "$prefix_clone"
+  fi
   echo 'Operation aborted o(x_x)o'
   exit 1
-  fi
 fi
 
 #---