From 6a6672c57e814a93fca1db8dc79d936d2a22eaa4 Mon Sep 17 00:00:00 2001
From: Michael Forney <mforney@mforney.org>
Date: Fri, 8 May 2020 13:43:01 -0700
Subject: Detect sha256 tool automatically

---
 pkg/git/fetch.sh           | 6 ++----
 pkg/linux-headers/fetch.sh | 6 ++----
 pkg/openbsd/fetch.sh       | 6 ++----
 scripts/checksum.sh        | 8 ++++++++
 scripts/fetch-curl.sh      | 6 ++----
 5 files changed, 16 insertions(+), 16 deletions(-)
 create mode 100644 scripts/checksum.sh

diff --git a/pkg/git/fetch.sh b/pkg/git/fetch.sh
index 9b17a0d5..326e7338 100644
--- a/pkg/git/fetch.sh
+++ b/pkg/git/fetch.sh
@@ -1,5 +1,3 @@
-: "${SHA256SUM:=sha256sum}"
-
 set -e
 
 sh scripts/fetch-git.sh "$@"
@@ -11,9 +9,9 @@ if [ -e src/man ] ; then
 	rm -rf src/man
 fi
 
-if ! $SHA256SUM -c sha256 2>/dev/null ; then
+if ! sh "$OLDPWD/scripts/checksum.sh" -c sha256 2>/dev/null ; then
 	curl -L -O -K url
-	$SHA256SUM -c sha256
+	sh "$OLDPWD/scripts/checksum.sh" -c sha256
 fi
 
 read -r _ archive <sha256
diff --git a/pkg/linux-headers/fetch.sh b/pkg/linux-headers/fetch.sh
index 0d5f32d8..0866f9b7 100644
--- a/pkg/linux-headers/fetch.sh
+++ b/pkg/linux-headers/fetch.sh
@@ -1,5 +1,3 @@
-: "${SHA256SUM:=sha256sum}"
-
 set -e
 
 dir=$1
@@ -11,9 +9,9 @@ if [ -e src ] ; then
         rm -rf src
 fi
 
-if ! $SHA256SUM -c sha256 2>/dev/null ; then
+if ! sh "$OLDPWD/scripts/checksum.sh" -c sha256 2>/dev/null ; then
         curl -L -K url -O
-        $SHA256SUM -c sha256
+        sh "$OLDPWD/scripts/checksum.sh" -c sha256
 fi
 
 read -r _ archive <sha256
diff --git a/pkg/openbsd/fetch.sh b/pkg/openbsd/fetch.sh
index 021eb802..bff225ed 100644
--- a/pkg/openbsd/fetch.sh
+++ b/pkg/openbsd/fetch.sh
@@ -1,5 +1,3 @@
-: "${SHA256SUM:=sha256sum}"
-
 set -e
 
 dir=$1
@@ -11,9 +9,9 @@ if [ -e src ] ; then
         rm -rf src
 fi
 
-if ! $SHA256SUM -c sha256 2>/dev/null ; then
+if ! sh "$OLDPWD/scripts/checksum.sh" -c sha256 2>/dev/null ; then
         curl -L -K url -O
-        $SHA256SUM -c sha256
+        sh "$OLDPWD/scripts/checksum.sh" -c sha256
 fi
 
 sh "$OLDPWD/scripts/extract.sh" src.tar.gz -s ',^,src/,' \
diff --git a/scripts/checksum.sh b/scripts/checksum.sh
new file mode 100644
index 00000000..6452d932
--- /dev/null
+++ b/scripts/checksum.sh
@@ -0,0 +1,8 @@
+if command -v sha256sum >/dev/null; then
+	exec sha256sum "$@"
+elif command -v shasum >/dev/null; then
+	exec shasum -a 256 "$@"
+else
+	printf '%s: sha256sum or shasum required\n' "$0" >&2
+	exit 1
+fi
diff --git a/scripts/fetch-curl.sh b/scripts/fetch-curl.sh
index 80d70ee0..a6d5af57 100644
--- a/scripts/fetch-curl.sh
+++ b/scripts/fetch-curl.sh
@@ -1,5 +1,3 @@
-: "${SHA256SUM:=sha256sum}"
-
 set -e
 
 if [ "$#" != 1 ] ; then
@@ -16,9 +14,9 @@ if [ -e src ] ; then
 	rm -rf src
 fi
 
-if ! $SHA256SUM -c sha256 2>/dev/null ; then
+if ! sh "$OLDPWD/scripts/checksum.sh" -c sha256 2>/dev/null ; then
 	curl -L -K url -O
-	$SHA256SUM -c sha256
+	sh "$OLDPWD/scripts/checksum.sh" -c sha256
 fi
 
 while read -r _ archive ; do
-- 
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