test: Guess a value for NOTMUCH_PYTHON

[notmuch] / test / test-lib-common.sh

diff --git a/test/test-lib-common.sh b/test/test-lib-common.sh
index ebbf4cdfa6fd2e727f78d651fdf31dcb8c3ead7d..4d14e0b3b18e506b445e7e9c38b45a545382ded0 100644 (file)
--- a/test/test-lib-common.sh
+++ b/test/test-lib-common.sh
@@ -29,6 +29,20 @@ if [[ -z "$NOTMUCH_SRCDIR" ]] || [[ -z "$NOTMUCH_BUILDDIR" ]]; then
        exit 1
 fi
 
+# Explicitly require external prerequisite.  Useful when binary is
+# called indirectly (e.g. from emacs).
+# Returns success if dependency is available, failure otherwise.
+test_require_external_prereq () {
+       local binary
+       binary="$1"
+       if [[ ${test_missing_external_prereq_["${binary}"]} == t ]]; then
+               # dependency is missing, call the replacement function to note it
+               eval "$binary"
+       else
+               true
+       fi
+}
+
 backup_database () {
     test_name=$(basename $0 .sh)
     rm -rf $TMP_DIRECTORY/notmuch-dir-backup."$test_name"
@@ -309,6 +323,10 @@ rm -rf "$TMP_DIRECTORY" || {
        exit 1
 }
 
+# Provide a guess at a usable Python, to support running tests without
+# running configure first.
+NOTMUCH_PYTHON=${NOTMUCH_PYTHON-python3}
+
 # A temporary home directory is needed by at least:
 # - emacs/"Sending a message via (fake) SMTP"
 # - emacs/"Reply within emacs"