Support FreeBSD SHA-256

Use [autodetect_system_binaries] so [awk]
is not from PATH.
Add test.

Author: jonahbeckford

.gitattributes

@@ -22,6 +22,7 @@ opam text
 *.ml text eol=lf
 *.opam text eol=lf
 *.opam.template text eol=lf
+*.txt text eol=lf
 
 # Declare files that will always have CRLF line endings on checkout.
 *.sln text eol=crlf

dkml-runtime-common-native.opam

@@ -19,10 +19,13 @@ dev-repo: "git+https://github.com/diskuv/dkml-runtime-common.git"
 #   Must not rely on OCaml (ex. diskuvbox or dune) because this
 #   package is a dependency of OCaml compilers like dkml-base-compiler!
 depends: []
+build: [
+  ["sh" "tests/crossplatform-tests.sh"] { with-test & !(os = "win32") }
+]
 install: [
-  # TODO: opam does not quote when there is a space in the _:lib
-  # so we have to avoid the (correct) Command Prompt shell. Needs a bug
-  # report. (jonahbeckford@ 2023-01-11)
+  # TODO: opam does not pass to Command Prompt correctly when there is a
+  # space in the _:lib so we have to avoid the (correct) Command Prompt
+  # shell. https://github.com/ocaml/opam/issues/5673
   #[".\\install.cmd" "\"%{_:lib}%\""] { os = "win32"}
   ["sh" "./install.sh"   "%{_:lib}%"] # {!(os = "win32")}
 ]

tests/crossplatform-tests.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+# shellcheck disable=SC1091
+. unix/crossplatform-functions.sh
+
+# Test Vectors
+#   NIST.1
+sha256check tests/nist.1.txt ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad

tests/nist.1.txt

@@ -0,0 +1 @@
+abc

unix/crossplatform-functions.sh

@@ -2832,10 +2832,16 @@ sha256compute() {
         sha256compute_FILE=$(/usr/bin/cygpath -a "$sha256compute_FILE")
     fi
 
-    if [ -x /usr/bin/shasum ]; then
-        /usr/bin/shasum -a 256 "$sha256compute_FILE" | awk '{print $1}'
-    elif [ -x /usr/bin/sha256sum ]; then
-        /usr/bin/sha256sum "$sha256compute_FILE" | awk '{print $1}'
+    autodetect_system_binaries
+    if [ -x /usr/bin/shasum ]; then # macOS, OpenBSD
+        #   shellcheck disable=SC2016
+        /usr/bin/shasum -a 256 "$sha256compute_FILE" | "$DKMLSYS_AWK" '{print $1}'
+    elif [ -x /usr/bin/sha256sum ]; then # Linux, MSYS2
+        #   shellcheck disable=SC2016
+        /usr/bin/sha256sum "$sha256compute_FILE" | "$DKMLSYS_AWK" '{print $1}'
+    elif [ -x /sbin/sha256 ]; then # FreeBSD
+        #   shellcheck disable=SC2016
+        /sbin/sha256 -r "$sha256compute_FILE" | "$DKMLSYS_AWK" '{print $1}'
     else
         printf "FATAL: %s\n" "No sha256 checksum utility found" >&2
         exit 107
@@ -2849,12 +2855,22 @@ sha256check() {
     shift
     sha256check_SUM="$1"
     shift
-    if [ -x /usr/bin/shasum ]; then
+
+    if [ -x /usr/bin/shasum ]; then # macOS, OpenBSD
         printf "%s  %s" "$sha256check_SUM" "$sha256check_FILE" | /usr/bin/shasum -a 256 -c >&2
-    elif [ -x /usr/bin/sha256sum ]; then
+    elif [ -x /usr/bin/sha256sum ]; then # Linux, MSYS2
         printf "%s  %s" "$sha256check_SUM" "$sha256check_FILE" | /usr/bin/sha256sum -c >&2
+    elif [ -x /sbin/sha256 ]; then # FreeBSD
+        /sbin/sha256 -c "$sha256check_SUM" "$sha256check_FILE" >&2
     else
         printf "FATAL: %s\n" "No sha256 checksum utility found" >&2
+
+        # REMOVEME!
+        if [ -d /sbin ]; then printf "/sbin:\n" >&2; ls /sbin >&2; fi
+        if [ -d /usr/sbin ]; then printf "/usr/sbin:\n" >&2; ls /usr/sbin >&2; fi
+        if [ -d /bin ]; then printf "/bin:\n" >&2; ls /bin >&2; fi
+        if [ -d /usr/bin ]; then printf "/usr/bin:\n" >&2; ls /usr/bin >&2; fi
+
         exit 107
     fi
 }