Determine which VCS is being used

We want to add the ability for otp_build to determine which
version control system (VCS) is being used, so that the
commands for updating the primary bootstrap and pre-loaded
modules can be updated to do different things depending on
the VCS.

In the beginning of the otp_build script, set the variable
"version_controller"  to either "none" (for no VCS), "git",
or "clearcase".

1 files changed, 18 insertions, 0 deletions

diff --git a/otp_build b/otp_build
index cddb477db5..07edcb1d4d 100755
--- a/otp_build
+++ b/otp_build
@@ -189,7 +189,23 @@ target_contains ()
 	return $?
 } 
 
+determine_version_controller ()
+{
+    version_controller=none
 
+    # The current directory is now $ERL_TOP. Check for
+    # either this directory being controlled by git or
+    # for the "otp_build" file being a Clearcase controlled
+    # object.
+
+    if git rev-parse --git-dir 2>/dev/null >/dev/null; then
+	version_controller=git
+    else
+	if test -d "otp_build@@/"; then
+	    version_controller=clearcase
+	fi
+    fi
+}
 
 # Execution of the different options
 
@@ -1144,6 +1160,8 @@ check_erltop
 
 cd $ERL_TOP
 
+determine_version_controller
+
 # Unset ERL_FLAGS and ERL_<Release>_FLAGS to prevent, for instance,
 # a value of "-hybrid" to run the hybrid emulator during bootstrap.
 sys_vsn=`awk '/SYSTEM_VSN = / {print $3}' < erts/vsn.mk`