fetch-pack: eliminate spurious error messages

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 9096398b184df722492cd6072d618edb78eb5206..9bc57d27e961720c98f75f95ab3186723e77f88b 100644 (file)
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -221,9 +221,35 @@ write_script () {
 # capital letters by convention).
 
 test_set_prereq () {
-       satisfied="$satisfied$1 "
+       satisfied_prereq="$satisfied_prereq$1 "
+}
+satisfied_prereq=" "
+lazily_testable_prereq= lazily_tested_prereq=
+
+# Usage: test_lazy_prereq PREREQ 'script'
+test_lazy_prereq () {
+       lazily_testable_prereq="$lazily_testable_prereq$1 "
+       eval test_prereq_lazily_$1=\$2
+}
+
+test_run_lazy_prereq_ () {
+       script='
+mkdir -p "$TRASH_DIRECTORY/prereq-test-dir" &&
+(
+       cd "$TRASH_DIRECTORY/prereq-test-dir" &&'"$2"'
+)'
+       say >&3 "checking prerequisite: $1"
+       say >&3 "$script"
+       test_eval_ "$script"
+       eval_ret=$?
+       rm -rf "$TRASH_DIRECTORY/prereq-test-dir"
+       if test "$eval_ret" = 0; then
+               say >&3 "prerequisite $1 ok"
+       else
+               say >&3 "prerequisite $1 not satisfied"
+       fi
+       return $eval_ret
 }
-satisfied=" "
 
 test_have_prereq () {
        # prerequisites can be concatenated with ','
@@ -238,8 +264,24 @@ test_have_prereq () {
 
        for prerequisite
        do
+               case " $lazily_tested_prereq " in
+               *" $prerequisite "*)
+                       ;;
+               *)
+                       case " $lazily_testable_prereq " in
+                       *" $prerequisite "*)
+                               eval "script=\$test_prereq_lazily_$prerequisite" &&
+                               if test_run_lazy_prereq_ "$prerequisite" "$script"
+                               then
+                                       test_set_prereq $prerequisite
+                               fi
+                               lazily_tested_prereq="$lazily_tested_prereq$prerequisite "
+                       esac
+                       ;;
+               esac
+
                total_prereq=$(($total_prereq + 1))
-               case $satisfied in
+               case "$satisfied_prereq" in
                *" $prerequisite "*)
                        ok_prereq=$(($ok_prereq + 1))
                        ;;