feat(chang_shasum): make it more portable

Author: majkelcc

sources/chang

@@ -23,8 +23,7 @@ export CHANG_UID=${CHANG_UID:-1000}
 export CHANG_GID=${CHANG_GID:-1000}
 export CHANG_MIN_IMAGE=${CHANG_MIN_IMAGE:-alpine:latest}
 export CHANG_EXTRA_PORTS_START=${CHANG_EXTRA_PORTS_START:-8080}
-export CHANG_SHASUM=${CHANG_SHASUM:-shasum}
-
+export CHANG_APP_HASH_LENGTH=${CHANG_APP_HASH_LENGTH:-6}
 export CHANG_PWD=$(pwd -P)
 export CHANG_TMP_PATH=$CHANG_PWD/.chang/tmp
 export CHANG_STATE_PATH=$CHANG_TMP_PATH/state

sources/chang_app_hash.sh

@@ -1,3 +1,14 @@
 chang_app_hash() {
-  echo "$@" | ${CHANG_SHASUM} - | head -c 6
+  if command -v sha256sum >/dev/null 2>&1; then
+    echo "$@" | sha256sum | cut -d' ' -f1 | head -c ${CHANG_APP_HASH_LENGTH}
+  elif command -v shasum >/dev/null 2>&1; then
+    echo "$@" | shasum -a 256 | cut -d' ' -f1 | head -c ${CHANG_APP_HASH_LENGTH}
+  elif command -v openssl >/dev/null 2>&1; then
+    echo "$@" | openssl sha256 | cut -d' ' -f2 | head -c ${CHANG_APP_HASH_LENGTH}
+  elif command -v md5sum >/dev/null 2>&1; then
+    echo "$@" | md5sum | cut -d' ' -f1 | head -c ${CHANG_APP_HASH_LENGTH}
+  else
+    echo "No supported hash command found" >&2
+    exit 1
+  fi
 }

sources/chang_compare_commit.sh

@@ -6,4 +6,4 @@ chang_compare_commit() {
   else
     return 1
   fi
-}
+}