Add symbolic file support for FISH demo

demos/fish/Occlum.json

@@ -1,12 +1,18 @@
 {
-    "vm": {
-        "user_space_size": "512MB"
+    "resource_limits": {
+        "user_space_size": "512MB",
+        "kernel_space_heap_size": "32MB",
+        "kernel_space_stack_size": "1MB",
+        "max_num_of_threads": 32
     },
     "process": {
         "default_stack_size": "4MB",
         "default_heap_size": "32MB",
         "default_mmap_size": "80MB"
     },
+    "entry_points": [
+        "/bin"
+    ],
     "env": {
         "default": [
             "OCCLUM=yes",
@@ -15,9 +21,11 @@
         "untrusted": [
         ]
     },
-    "entry_points": [
-        "/bin"
-    ],
+    "metadata": {
+        "product_id": 0,
+        "version_number": 0,
+        "debuggable": true
+    },
     "mount": [
         {
             "target": "/",

demos/fish/README.md

@@ -11,12 +11,15 @@ for most of the utilities you usually find in GNU fileutils, shellutils, etc.
 
 This shell script contains executable binaries, pipe symbols and output redirection like this:
 ```
-busybox echo "Hello-world-from-fish" | busybox awk '$1=$1' FS="-" OFS=" " > /root/output.txt
+command echo "Hello-world-from-fish" | awk '$1=$1' FS="-" OFS=" " > /root/output.txt
+cat /root/output.txt
 ```
 
 which is defined in `fish_script.sh`. `awk` will replace `-` to `space` and should output result
 string `Hello world from fish` and store in `/root/output.txt` of Occlum SEFS and can only be read
-inside Occlum.
+inside Occlum. `echo`, `awk`, `cat` here are actually symbolic files linked to busybox and in this way, we don't need
+to write `busybox` prefix. The `command` keyword tells FISH that `echo` is an external command because FISH also provides
+builtin `echo` command.
 
 ## Step 1:
 Downlaod FISH and busybox and build them with Occlum tool chain:
@@ -25,26 +28,13 @@ Downlaod FISH and busybox and build them with Occlum tool chain:
 ```
 
 ## Step 2:
-Prepare environment by running:
+Run command to prepare context and execute script:
 ```
-./env_setup.sh
+./run_fish_test.sh
 ```
-
-If user wants to run this demo on non-SGX platform, run command:
+Or if this demo is running on non-SGX platform, use:
 ```
-SGX_MODE=SIM ./env_setup.sh
-```
-
-## Step 3:
-Run command to execute script:
-```
-cd occlum-context && occlum run /bin/fish /fish_script.sh
-```
-
-## Step 4:
-Go to `occlum-context` and check result by running:
-```
-occlum run /bin/busybox cat /root/output.txt
+SGX_MODE=SIM ./run_fish_test.sh
 ```
 
 And you should see `Hello world from fish`.

demos/fish/download_and_build.sh

@@ -6,7 +6,7 @@ git clone -b v6.1 --depth 1 https://github.com/mirror/ncurses.git
 cd ncurses
 CC=occlum-gcc CXX=occlum-g++ CFLAGS="-O2 -fPIC" CXXFLAGS="-O2 -fPIC" LDFLAGS="-pie"  \
 ./configure --without-shared --without-cxx-shared --prefix=/usr/local/occlum --enable-overwrite
-make && make install
+make -j$(nproc) && make install
 cd ..
 
 # download and build FISH
@@ -22,7 +22,7 @@ cmake ../  -DCMAKE_BUILD_TYPE=Debug -DCURSES_LIBRARY=/opt/occlum/toolchains/gcc/
 -DCMAKE_C_COMPILER_RANLIB=/usr/local/occlum/bin/occlum-ranlib \
 -DCMAKE_LINKER=/usr/local/occlum/bin/occlum-ld -DCMAKE_C_FLAGS="-I/usr/local/occlum/include -fpic -pie" \
 -DCMAKE_CXX_FLAGS="-I/usr/local/occlum/include -fpic -pie"
-make
+make -j$(nproc)
 cd ../../
 
 # download and build busybox
@@ -31,4 +31,4 @@ cd busybox
 CROSS_COMPILE=/opt/occlum/toolchains/gcc/bin/occlum-
 make CROSS_COMPILE="$CROSS_COMPILE" defconfig
 cp ../.config .
-make CROSS_COMPILE="$CROSS_COMPILE"
+make CROSS_COMPILE="$CROSS_COMPILE" -j$(nproc)

demos/fish/fish_script.sh

@@ -1,2 +1,3 @@
 #! /bin/fish
-busybox echo "Hello-world-from-fish" | busybox awk '$1=$1' FS="-" OFS=" " > /root/output.txt
+command echo "Hello-world-from-fish" | awk '$1=$1' FS="-" OFS=" " > /root/output.txt
+cat /root/output.txt

demos/fish/run_fish_test.sh

@@ -1,7 +1,6 @@
 #!/bin/bash
 set -e
 
-#
 rm -rf occlum-context
 mkdir occlum-context && cd occlum-context
 occlum init
@@ -9,5 +8,12 @@ cp ../Occlum.json .
 cp ../fish-shell/build/fish image/bin
 cp ../busybox/busybox image/bin
 cp ../fish_script.sh image
+pushd image/bin
+ln -s /bin/busybox cat
+ln -s /bin/busybox echo
+ln -s /bin/busybox awk
+popd
 
 occlum build
+echo -e "\nBuild done. Running fish script ..."
+occlum run /bin/fish /fish_script.sh