From 814319d7c087319ce1c01378053cb3fbfd768fdf Mon Sep 17 00:00:00 2001
From: Kevin Wang <kevin@kevinwang.com>
Date: Tue, 26 Aug 2014 23:52:53 -0500
Subject: [PATCH 1/3] Make shasum the lowest priority checksum command.

This fixes false "Checksums do not match" errors on systems where shasum
is a symlink to sha256sum or otherwise.
---
 nvm.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/nvm.sh b/nvm.sh
index 500e472..71cbd9b 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -278,12 +278,12 @@ nvm_ls_remote() {
 }
 
 nvm_checksum() {
-  if nvm_has "shasum"; then
-    checksum=$(shasum $1 | \awk '{print $1}')
+  if nvm_has "sha1sum"; then
+    checksum=$(sha1sum $1 | \awk '{print $1}')
   elif nvm_has "sha1"; then
     checksum=$(sha1 -q $1)
   else
-    checksum=$(sha1sum $1 | \awk '{print $1}')
+    checksum=$(shasum $1 | \awk '{print $1}')
   fi
 
   if [ "$checksum" = "$2" ]; then

From 429656bc4149b8d682cbc3a0f5dce21c419db74f Mon Sep 17 00:00:00 2001
From: Kevin Wang <kevin@kevinwang.com>
Date: Sat, 30 Aug 2014 21:54:46 -0500
Subject: [PATCH 2/3] Add unit tests for nvm_checksum.

---
 test/fast/Unit tests/nvm_checksum | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100755 test/fast/Unit tests/nvm_checksum

diff --git a/test/fast/Unit tests/nvm_checksum b/test/fast/Unit tests/nvm_checksum
new file mode 100755
index 0000000..408659b
--- /dev/null
+++ b/test/fast/Unit tests/nvm_checksum	
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+cleanup () {
+  rm tmp/emptyfile tmp/testfile
+  rmdir tmp
+}
+die () { echo $@ ; exit 1; }
+
+. ../../../nvm.sh
+
+mkdir -p tmp
+touch tmp/emptyfile
+echo -n "test" > tmp/testfile
+
+nvm_checksum tmp/emptyfile "da39a3ee5e6b4b0d3255bfef95601890afd80709" || die "nvm_checksum on an empty file did not match the SHA1 digest of the empty string"
+nvm_checksum tmp/testfile "da39a3ee5e6b4b0d3255bfef95601890afd80709" && die "nvm_checksum allowed a bad checksum"
+
+cleanup

From e8056ac460e2fdaf7cb97174f37c1d86b2d2f9f9 Mon Sep 17 00:00:00 2001
From: Kevin Wang <kevin@kevinwang.com>
Date: Sat, 30 Aug 2014 21:57:17 -0500
Subject: [PATCH 3/3] Run cleanup on die in nvm_checksum unit test.

---
 test/fast/Unit tests/nvm_checksum | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/fast/Unit tests/nvm_checksum b/test/fast/Unit tests/nvm_checksum
index 408659b..73cf1f1 100755
--- a/test/fast/Unit tests/nvm_checksum	
+++ b/test/fast/Unit tests/nvm_checksum	
@@ -4,7 +4,7 @@ cleanup () {
   rm tmp/emptyfile tmp/testfile
   rmdir tmp
 }
-die () { echo $@ ; exit 1; }
+die () { echo $@ ; cleanup; exit 1; }
 
 . ../../../nvm.sh