[PATCH 09/18] chainlint.pl: don't require `&` background command to end with `&&`

["Eric Sunshine via GitGitGadget" <gitgitgadget@gmail.com>]

From: Eric Sunshine <sunshine@sunshineco.com>

The exit status of the `&` asynchronous operator which starts a command
in the background is unconditionally zero, and the few places in the
test scripts which launch commands asynchronously are not interested in
the exit status of the `&` operator (though they often capture the
background command's PID). As such, there is little value in complaining
about broken &&-chain for a command launched in the background, and
doing so would only make busy-work for test authors. Therefore, take
this special case into account when checking for &&-chain breakage.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
---
 t/chainlint.pl                            |  2 +-
 t/chainlint/chain-break-background.expect |  9 +++++++++
 t/chainlint/chain-break-background.test   | 10 ++++++++++
 3 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 t/chainlint/chain-break-background.expect
 create mode 100644 t/chainlint/chain-break-background.test

diff --git a/t/chainlint.pl b/t/chainlint.pl
index 31c444067ce..ba3fcb0c8e6 100755
--- a/t/chainlint.pl
+++ b/t/chainlint.pl
@@ -483,7 +483,7 @@ sub match_ending {
 }
 
 my @safe_endings = (
-	[qr/^(?:&&|\|\||\|)$/],
+	[qr/^(?:&&|\|\||\||&)$/],
 	[qr/^(?:exit|return)$/, qr/^(?:\d+|\$\?)$/],
 	[qr/^(?:exit|return)$/, qr/^(?:\d+|\$\?)$/, qr/^;$/],
 	[qr/^(?:exit|return|continue)$/],
diff --git a/t/chainlint/chain-break-background.expect b/t/chainlint/chain-break-background.expect
new file mode 100644
index 00000000000..28f9114f42d
--- /dev/null
+++ b/t/chainlint/chain-break-background.expect
@@ -0,0 +1,9 @@
+JGIT_DAEMON_PID= &&
+git init --bare empty.git &&
+> empty.git/git-daemon-export-ok &&
+mkfifo jgit_daemon_output &&
+{
+	jgit daemon --port="$JGIT_DAEMON_PORT" . > jgit_daemon_output &
+	JGIT_DAEMON_PID=$!
+} &&
+test_expect_code 2 git ls-remote --exit-code git://localhost:$JGIT_DAEMON_PORT/empty.git
diff --git a/t/chainlint/chain-break-background.test b/t/chainlint/chain-break-background.test
new file mode 100644
index 00000000000..e10f656b055
--- /dev/null
+++ b/t/chainlint/chain-break-background.test
@@ -0,0 +1,10 @@
+JGIT_DAEMON_PID= &&
+git init --bare empty.git &&
+>empty.git/git-daemon-export-ok &&
+mkfifo jgit_daemon_output &&
+{
+# LINT: exit status of "&" is always 0 so &&-chaining immaterial
+	jgit daemon --port="$JGIT_DAEMON_PORT" . >jgit_daemon_output &
+	JGIT_DAEMON_PID=$!
+} &&
+test_expect_code 2 git ls-remote --exit-code git://localhost:$JGIT_DAEMON_PORT/empty.git
-- 
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