Travis: don't install requirements.txt if we're just building.

(And running unit tests).

This tests our instructions in INSTALL.md, which say you only need
requirements.txt for development or running tests, not building.

Also removes the unused SOURCE_CHECK_ONLY flag.

Signed-off-by: Rusty Russell <[email protected]>

.travis.yml

@@ -9,6 +9,7 @@ before_install:
 
 env:
   # These run superficial checks that don't take too long on their own
+  - ARCH=64 TEST_CMD="make" NO_PYTHON=1
   - ARCH=64 TEST_CMD="make check-source check-units installcheck" COPTFLAGS="-O3"
   - ARCH=32 TEST_CMD="make check-source check-units installcheck" DEVELOPER=0
   - ARCH=64 TEST_CMD="make check-source check-units installcheck" DEVELOPER=0 COMPILER=gcc-4.8

.travis/build.sh

@@ -6,12 +6,12 @@ export SLOW_MACHINE=1
 export CC=${COMPILER:-gcc}
 export DEVELOPER=${DEVELOPER:-1}
 export EXPERIMENTAL_FEATURES=${EXPERIMENTAL_FEATURES:-0}
-export SOURCE_CHECK_ONLY=${SOURCE_CHECK_ONLY:-"false"}
 export COMPAT=${COMPAT:-1}
 export PATH=$CWD/dependencies/bin:"$HOME"/.local/bin:"$PATH"
 export PYTEST_PAR=2
 export PYTEST_SENTRY_ALWAYS_REPORT=1
 export BOLTDIR=lightning-rfc
+
 # Allow up to 4 concurrent tests when not under valgrind, which might run out of memory.
 if [ "$VALGRIND" = 0 ]; then
     PYTEST_PAR=4
@@ -28,34 +28,35 @@ if [ ! -f dependencies/bin/bitcoind ]; then
     rm -rf bitcoin-0.20.1-x86_64-linux-gnu.tar.gz bitcoin-0.20.1
 fi
 
-pyenv global 3.7
+if [ "$NO_PYTHON" != 1 ]; then
+    pyenv global 3.7
+
+    pip3 install --user -U --quiet --progress-bar off \
+	 pip \
+	 pytest-test-groups==1.0.3
 
-# Update pip first, may save us the compilation of binary packages in the next call
-pip3 install --user -U --quiet --progress-bar off \
-     pip \
-     pytest-test-groups==1.0.3
+    pip3 install --user -U --quiet --progress-bar off \
+	 -r requirements.txt \
+	 -r contrib/pyln-client/requirements.txt \
+	 -r contrib/pyln-proto/requirements.txt \
+	 -r contrib/pyln-testing/requirements.txt
 
-pip3 install --user -U --quiet --progress-bar off \
-     -r requirements.txt \
-     -r contrib/pyln-client/requirements.txt \
-     -r contrib/pyln-proto/requirements.txt \
-     -r contrib/pyln-testing/requirements.txt
+    pip3 install --user -U --quiet --progress-bar off \
+	 pytest-sentry \
+	 pytest-rerunfailures
 
-pip3 install --user -U --quiet --progress-bar off \
-     pytest-sentry \
-     pytest-rerunfailures
+   cat > pytest.ini << EOF
+[pytest]
+addopts=-p no:logging --color=no --reruns=5
+EOF
+fi
 
 echo "Configuration which is going to be built:"
 echo -en 'travis_fold:start:script.1\\r'
 ./configure CC="$CC"
 cat config.vars
 echo -en 'travis_fold:end:script.1\\r'
 
-cat > pytest.ini << EOF
-[pytest]
-addopts=-p no:logging --color=no --reruns=5
-EOF
-
 git clone https://github.com/lightningnetwork/lightning-rfc.git
 
 if [ "$TARGET_HOST" == "arm-linux-gnueabihf" ] || [ "$TARGET_HOST" == "aarch64-linux-gnu" ]