bisect: print an error message when "git rev-list --bisect-vars" fails

diff --git a/t/test-lib.sh b/t/test-lib.sh
index 9d9cb8d5a1de359e6431dd58b002b065d5651268..7c2a8ba77d312c3196767969a39687bfb12f74c9 100644 (file)
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -3,12 +3,16 @@
 # Copyright (c) 2005 Junio C Hamano
 #
 
+# Keep the original TERM for say_color
+ORIGINAL_TERM=$TERM
+
 # For repeatability, reset the environment to known value.
 LANG=C
 LC_ALL=C
 PAGER=cat
 TZ=UTC
-export LANG LC_ALL PAGER TZ
+TERM=dumb
+export LANG LC_ALL PAGER TERM TZ
 EDITOR=:
 VISUAL=:
 unset GIT_EDITOR
@@ -38,6 +42,7 @@ export GIT_MERGE_VERBOSITY
 export GIT_AUTHOR_EMAIL GIT_AUTHOR_NAME
 export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME
 export EDITOR VISUAL
+GIT_TEST_CMP=${GIT_TEST_CMP:-diff -u}
 
 # Protect ourselves from common misconfiguration to export
 # CDPATH into the environment
@@ -58,12 +63,14 @@ esac
 # This test checks if command xyzzy does the right thing...
 # '
 # . ./test-lib.sh
-
-[ "x$TERM" != "xdumb" ] &&
-       [ -t 1 ] &&
-       tput bold >/dev/null 2>&1 &&
-       tput setaf 1 >/dev/null 2>&1 &&
-       tput sgr0 >/dev/null 2>&1 &&
+[ "x$ORIGINAL_TERM" != "xdumb" ] && (
+               TERM=$ORIGINAL_TERM &&
+               export TERM &&
+               [ -t 1 ] &&
+               tput bold >/dev/null 2>&1 &&
+               tput setaf 1 >/dev/null 2>&1 &&
+               tput sgr0 >/dev/null 2>&1
+       ) &&
        color=t
 
 while test "$#" -ne 0
@@ -91,6 +98,9 @@ done
 
 if test -n "$color"; then
        say_color () {
+               (
+               TERM=$ORIGINAL_TERM
+               export TERM
                case "$1" in
                        error) tput bold; tput setaf 1;; # bold red
                        skip)  tput bold; tput setaf 2;; # bold green
@@ -101,6 +111,7 @@ if test -n "$color"; then
                shift
                echo "* $*"
                tput sgr0
+               )
        }
 else
        say_color() {
@@ -275,6 +286,40 @@ test_expect_code () {
        echo >&3 ""
 }
 
+# This is not among top-level (test_expect_success | test_expect_failure)
+# but is a prefix that can be used in the test script, like:
+#
+#      test_expect_success 'complain and die' '
+#           do something &&
+#           do something else &&
+#          test_must_fail git checkout ../outerspace
+#      '
+#
+# Writing this as "! git checkout ../outerspace" is wrong, because
+# the failure could be due to a segv.  We want a controlled failure.
+
+test_must_fail () {
+       "$@"
+       test $? -gt 0 -a $? -le 129
+}
+
+# test_cmp is a helper function to compare actual and expected output.
+# You can use it like:
+#
+#      test_expect_success 'foo works' '
+#              echo expected >expected &&
+#              foo >actual &&
+#              test_cmp expected actual
+#      '
+#
+# This could be written as either "cmp" or "diff -u", but:
+# - cmp's output is not nearly as easy to read as diff -u
+# - not all diff versions understand "-u"
+
+test_cmp() {
+       $GIT_TEST_CMP "$@"
+}
+
 # Most tests can use the created repository, but some may need to create more.
 # Usage: test_create_repo <directory>
 test_create_repo () {
@@ -347,9 +392,16 @@ if ! test -x ../test-chmtime; then
        exit 1
 fi
 
+. ../GIT-BUILD-OPTIONS
+
 # Test repository
 test=trash
-rm -fr "$test"
+rm -fr "$test" || {
+       trap - exit
+       echo >&5 "FATAL: Cannot prepare test area"
+       exit 1
+}
+
 test_create_repo $test
 cd "$test"