From aa727b8868b428a6b75e0d48a854be65242b257c Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Sun, 10 Nov 2013 15:25:23 +0100
Subject: o Automatically fetching Bats if not installed.

---
 Makefile              |  7 +++++--
 STYLE-GUIDE.txt       | 13 +++++++++++++
 test/app-upgrade.bats | 15 +++++++--------
 3 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/Makefile b/Makefile
index edf76c8..710c092 100644
--- a/Makefile
+++ b/Makefile
@@ -7,16 +7,19 @@ TESTS=$(addprefix test-,$(BATS))
 
 test-%:
 	@echo === $@
-	@bats $(patsubst test-%,test/%,$@)
+	@PATH=test/bats/bin:$(PATH) bats $(patsubst test-%,test/%,$@)
 
 show-tests:
 	@echo BATS=$(BATS)
 	@echo TESTS=$(TESTS)
 	@echo $(addprefix set_header-,$(BINS))
 
-test: $(TESTS)
+test: test/bats $(TESTS)
 .PHONY: test
 
+test/bats:
+	cd test && git clone git://github.com/sstephenson/bats.git
+
 clean:
 	@make -s -C docs clean
 .PHONY: clean
diff --git a/STYLE-GUIDE.txt b/STYLE-GUIDE.txt
index 77dce24..4eab7c2 100644
--- a/STYLE-GUIDE.txt
+++ b/STYLE-GUIDE.txt
@@ -43,8 +43,21 @@ usage_text() {
 Executing Commands
 ==================
 
+When chaining commands look at `pipefail`.
+
 * http://unix.stackexchange.com/q/23026
 
+If you want to fail this shell if a sub-shell fails, use this form:
+
+----------------------------------------------------------------------
+ENV=$(app conf get app.env) || false
+----------------------------------------------------------------------
+
+The sub-shell will exit with a non-zero exit code, but even with `-e`
+set bash won't exit the current shell.
+
+See also http://www.fvue.nl/wiki/Bash:_Error_handling.
+
 Parsing options
 ===============
 
diff --git a/test/app-upgrade.bats b/test/app-upgrade.bats
index 9a282e3..28841f3 100755
--- a/test/app-upgrade.bats
+++ b/test/app-upgrade.bats
@@ -58,13 +58,12 @@ load utils
   # Try to reinstall the same file
   rm fail-pre-install
   app upgrade
-  eq    '${lines[0]}' "Resolving version "
-  eq    '${lines[1]}' "Resolved version to 1359766920"
-  eq    '${lines[2]}' "Version 1359766920 is already unpacked"
-  eq    '${lines[3]}' "Importing config from versions/1359766920/app.config"
-  eq    '${lines[4]}' "pre-install"
-  eq    '${lines[5]}' "Changing current symlink from 1356998460 to 1359766920"
-  eq    '${lines[6]}' "post-install"
-
+  eq '${lines[0]}' "Resolving version "
+  eq '${lines[1]}' "Resolved version to 1359766920"
+  eq '${lines[2]}' "Version 1359766920 is already unpacked"
+  eq '${lines[3]}' "Importing config from versions/1359766920/app.config"
+  eq '${lines[4]}' "pre-install"
+  eq '${lines[5]}' "Changing current symlink from 1356998460 to 1359766920"
+  eq '${lines[6]}' "post-install"
   eq '${#lines[*]}' 7
 }
-- 
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