fix docker ENV problem

Dockerfile

@@ -1,6 +1,7 @@
 FROM fedora
 COPY . /magic
 WORKDIR /magic
+ENV magicdir=/magic
 RUN bash build.sh
 RUN ["chmod", "+x", "/magic/entrypoint.sh"]
 ENTRYPOINT ["/magic/entrypoint.sh"]

build.sh

@@ -32,7 +32,35 @@ set -x
 
 . env.sh
 
-mkdir ${magicprefix}
+mkdir -p ${magicprefix}
+
+
+# copied from:
+# https://gist.github.com/kleisauke/acfa1c09522705efa5eb0541d2d00887
+cat > "${magicdir}/emscripten-crossfile.meson" <<END
+[binaries]
+c = 'emcc'
+cpp = 'em++'
+ld = 'wasm-ld'
+ar = 'emar'
+ranlib = 'emranlib'
+pkgconfig = ['emconfigure', 'pkg-config']
+# https://docs.gtk.org/glib/cross-compiling.html#cross-properties
+[properties]
+growing_stack = true
+have_c99_vsnprintf = true
+have_c99_snprintf = true
+have_unix98_printf = true
+# Ensure that '-s PTHREAD_POOL_SIZE=*' is not injected into .pc files
+[built-in options]
+c_thread_count = 0
+cpp_thread_count = 0
+[host_machine]
+system = 'emscripten'
+cpu_family = 'wasm32'
+cpu = 'wasm32'
+endian = 'little'
+END
 
 check_result() {
     if [ $? -eq 0 ]; then

entrypoint.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
-. env.sh
+. /magic/env.sh
 exec "$@"

env.sh

@@ -6,7 +6,6 @@
 # http://www.wtfpl.net/ for more details.
 ################
 
-export magicdir=$(pwd)/
 export magicprefix=${magicdir}/build
 
 export MAKEFLAGS="-j$(nproc)"
@@ -22,29 +21,3 @@ ${magicdir}/emsdk/emsdk activate latest
 source ${magicdir}/emsdk/emsdk_env.sh
 
 export MESON_CROSS="${magicdir}/emscripten-crossfile.meson"
-# copied from:
-# https://gist.github.com/kleisauke/acfa1c09522705efa5eb0541d2d00887
-cat > "${magicdir}/emscripten-crossfile.meson" <<END
-[binaries]
-c = 'emcc'
-cpp = 'em++'
-ld = 'wasm-ld'
-ar = 'emar'
-ranlib = 'emranlib'
-pkgconfig = ['emconfigure', 'pkg-config']
-# https://docs.gtk.org/glib/cross-compiling.html#cross-properties
-[properties]
-growing_stack = true
-have_c99_vsnprintf = true
-have_c99_snprintf = true
-have_unix98_printf = true
-# Ensure that '-s PTHREAD_POOL_SIZE=*' is not injected into .pc files
-[built-in options]
-c_thread_count = 0
-cpp_thread_count = 0
-[host_machine]
-system = 'emscripten'
-cpu_family = 'wasm32'
-cpu = 'wasm32'
-endian = 'little'
-END