osmo-release: don't default to REL=patch

Make this script easier to use by showing the user the possible values
for REL and other environment variables when REL is missing instead of
assuming that they want REL=patch.

Change-Id: I3041cbace651cd477e0aa8abe56ce6b9bf1b011c
---
M osmo-release.mk
M osmo-release.sh
2 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/osmo-release.mk b/osmo-release.mk
index 01285b1..cd83397 100644
--- a/osmo-release.mk
+++ b/osmo-release.mk
@@ -1,9 +1,2 @@
-ifndef REL
-	REL := patch
-endif
-
 release:
-ifeq ($(origin REL), file)
-	@echo "No REL value specified, defaulting to 'patch' release"
-endif
 	@osmo-release.sh $(VERSION) $(REL)
diff --git a/osmo-release.sh b/osmo-release.sh
index e947fe4..8b3bbd1 100755
--- a/osmo-release.sh
+++ b/osmo-release.sh
@@ -3,8 +3,17 @@
 REL=$2
 
 if [ "z$REL" = "z" ]; then
-	echo "No REL value specified, defaulting to 'patch' release"
-	REL="patch"
+	echo "usage: make REL=patch|minor|major release"
+	echo
+	echo "optional environment variables:"
+	echo "  DRY_RUN=1                        run checks but make no modifications"
+	echo "  ALLOW_NO_LIBVERSION_CHANGE=1     skip LIBVERSION in Makefile.am fchecks"
+	echo "  ALLOW_NO_LIBVERSION_DEB_MATCH=1  skip LIBVERSION in debian packaging checks"
+	echo "  ALLOW_NO_LIBVERSION_RPM_MATCH=1  skip LIBVERSION in rpm packaging checks"
+	echo
+	echo "See also:"
+	echo "https://osmocom.org/projects/cellular-infrastructure/wiki/Make_a_new_release"
+	exit 1
 fi
 
 ALLOW_NO_LIBVERSION_CHANGE="${ALLOW_NO_LIBVERSION_CHANGE:-0}"

