Use GNU sha256sum if possible [EFForg#1504]

Andrew Lorente · Andrew Lorente · commit 4f24251840b3 · 2015-05-16T11:55:20.000-07:00
OSX doesn't ship with a sha256sum utility at all. Fortunately, the
coreutils Homebrew package provides a gsha256sum, so we can fall back to
that instead.
diff --git a/locate-gnu-utils.sh b/locate-gnu-utils.sh
@@ -16,6 +16,12 @@ if [ -x "$GMKTEMP" ]; then
   MKTEMP="$GMKTEMP"
 fi
 
+SHA256SUM=$(which sha256sum 2>/dev/null)
+GSHA256SUM=$(which gsha256sum 2>/dev/null)
+if [ -x "$GSHA256SUM" ]; then
+  SHA256SUM="$GSHA256SUM"
+fi
+
 check_for_gnu_version() {
   gnu_available=$("$1" --version 2>&1 | grep GNU)
   if [ ! "$gnu_available" ]; then
@@ -29,3 +35,4 @@ check_for_gnu_version() {
 
 check_for_gnu_version "$MKTEMP" "mktemp"
 check_for_gnu_version "$READLINK" "readlink"
+check_for_gnu_version "$SHA256SUM" "sha256sum"
diff --git a/test.sh b/test.sh
@@ -67,4 +67,5 @@ bash test-ruleset-coverage.sh
 echo "To reproduce this build (https://wiki.debian.org/ReproducibleBuilds)," \
      "please use this version of sqlite3:"
 sqlite3 -version
-echo -e "Git commit `git rev-parse HEAD`\nsha256sum  `sha256sum $XPI_NAME`"
+shasum=$("$SHA256SUM" "$XPI_NAME")
+echo -e "Git commit `git rev-parse HEAD`\nsha256sum  $shasum"
