To help -portable out, it would be nice if the shell scripts didn't assume
that equality checks are '==' rather than '=' (which works on any shell).

Patch attched.
-----------------------------------------------
commit 566e0ee7be3658e35381b86aee2469c0838c6985 (ta/fix-regress-portability)
from: Thomas Adam <thomas@xteddy.org>
date: Mon Nov 22 22:32:25 2021 UTC
 
 regress: make test operands POSIX compliant
 
 Since the interpreter for the regress shell scripts are using /bin/sh
 this will usually imply some level of POSIX compliance (that isn't
 bash-specific, for instance).
 
 Some systems use dash as their sh shell and as such is stricter POSIX
 compliance.  To help -portable, make the shell test checks use a single
 '=' for equality, rather than '=='.
 
diff b93f4b6eb6327216e57565cadbf70971803bc5a3 e49214037c8c52cb9f12c04f877f566181464b87
blob - bb31a4ff0f60f6eae6b54b90abdbf7ce98b11618
blob + ca1e787e193580d85479d0f3a60497b0559d95a8
--- regress/cmdline/cherrypick.sh
+++ regress/cmdline/cherrypick.sh
@@ -588,7 +588,7 @@ EOF
 	(cd $testroot/wt && got commit -m 'commit cherrypick result' \
 		> /dev/null 2>$testroot/stderr)
 	ret="$?"
-	if [ "$ret" == "0" ]; then
+	if [ "$ret" = "0" ]; then
 		echo "got commit succeeded unexpectedly" >&2
 		test_done "$testroot" "$ret"
 		return 1
blob - 7f88ca162b03984f506ec0612d4004a03f86c25f
blob + 66d5c86494cc7a9c82ea9071428274079529ae7f
--- regress/cmdline/diff.sh
+++ regress/cmdline/diff.sh
@@ -278,7 +278,7 @@ test_diff_basic() {
 	# -P can only be used in a work tree
 	got diff -r $testroot/repo -P new master 2> $testroot/stderr
 	ret="$?"
-	if [ "$ret" == "0" ]; then
+	if [ "$ret" = "0" ]; then
 		echo "diff succeeded unexpectedly" >&2
 		test_done "$testroot" "1"
 		return 1
@@ -1092,7 +1092,7 @@ test_diff_commits() {
 	(cd $testroot/repo && got diff -c $commit_id0 -c $commit_id1 -c foo \
 		2> $testroot/stderr)
 	ret="$?"
-	if [ "$ret" == "0" ]; then
+	if [ "$ret" = "0" ]; then
 		echo "diff succeeded unexpectedly" >&2
 		test_done "$testroot" "1"
 		return 1
@@ -1110,7 +1110,7 @@ test_diff_commits() {
 	(cd $testroot/wt && got diff -c $commit_id0 -c $commit_id1 -P foo \
 		2> $testroot/stderr)
 	ret="$?"
-	if [ "$ret" == "0" ]; then
+	if [ "$ret" = "0" ]; then
 		echo "diff succeeded unexpectedly" >&2
 		test_done "$testroot" "1"
 		return 1
@@ -1129,7 +1129,7 @@ test_diff_commits() {
 	(cd $testroot/wt && got diff -c $commit_id0 -c $commit_id1 -s foo \
 		2> $testroot/stderr)
 	ret="$?"
-	if [ "$ret" == "0" ]; then
+	if [ "$ret" = "0" ]; then
 		echo "diff succeeded unexpectedly" >&2
 		test_done "$testroot" "1"
 		return 1
@@ -1148,7 +1148,7 @@ test_diff_commits() {
 	(cd $testroot/repo && got diff $commit_id0 $commit_id1 foo \
 		2> $testroot/stderr)
 	ret="$?"
-	if [ "$ret" == "0" ]; then
+	if [ "$ret" = "0" ]; then
 		echo "diff succeeded unexpectedly" >&2
 		test_done "$testroot" "1"
 		return 1
@@ -1167,7 +1167,7 @@ test_diff_commits() {
 	(cd $testroot/wt && got diff $commit_id0 master foo \
 		2> $testroot/stderr)
 	ret="$?"
-	if [ "$ret" == "0" ]; then
+	if [ "$ret" = "0" ]; then
 		echo "diff succeeded unexpectedly" >&2
 		test_done "$testroot" "1"
 		return 1

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