MT#16393 Check for branch 'master' being active

Verify that the user is operating on branch master,
otherwise the result might be unexpected.

If branch master is checked out:

| root@spce:/etc/ngcp-config# ngcpcfg check
| root@spce:/etc/ngcp-config# ngcpcfg status
| [...]
| 2016-02-23 05:48:32: Checking currently active branch:
| 2016-02-23 05:48:32: OK:   branch master active

If a branch other than 'master' is checked out:

| root@spce:/etc/ngcp-config# ngcpcfg check
| 2016-02-23 05:47:42: Error: branch 'mika' in '/etc/ngcp-config' active - please switch to branch 'master' before continuing.
| root@spce:/etc/ngcp-config# echo $?
| 1
| root@spce:/etc/ngcp-config# ngcpcfg status
| [...]
| 2016-02-23 05:47:47: Checking currently active branch:
| 2016-02-23 05:47:47: ACTION_NEEDED: branch 'mika' active - please switch to branch 'master'
| [...]

Change-Id: I5df92075905cafa3b714211581c8cfe749df04ba

functions/main

@@ -48,6 +48,18 @@ log_debug() {
   fi
 }
 
+compare_active_branch() {
+  log_debug "get_active_branch ${1:-}"
+
+  log_debug "cd $NGCPCTL_MAIN"
+  cd "$NGCPCTL_MAIN"
+
+  local current_branch
+  current_branch=$(git rev-parse --abbrev-ref HEAD 2>/dev/null)
+  log_debug "current_branch = $current_branch"
+  echo "$current_branch"
+}
+
 get_branch_status() {
   log_debug "cd $NGCPCTL_MAIN"
   cd "$NGCPCTL_MAIN"

scripts/check

@@ -16,6 +16,16 @@ fi
 
 . "${FUNCTIONS}"/main
 
+check_branch() {
+  local current_branch=$(compare_active_branch 'master')
+  if [ "$current_branch" = 'master' ] ; then
+    log_debug "Current branch is 'master', continuing."
+  else
+    log_error "branch '$current_branch' in '$NGCPCTL_MAIN' active - please switch to branch 'master' before continuing."
+    exit 1
+  fi
+}
+
 check_config_encoding() {
   log_debug "Checking encoding for $config_files"
   for f in $config_files ; do
@@ -131,6 +141,8 @@ else
   config_files="$*"
 fi
 
+check_branch
+
 check_configs
 if "${VALIDATE_SCHEMA:-false}" ; then
   validate_config

scripts/status

@@ -95,6 +95,17 @@ check_etc_state() {
   fi
 }
 
+check_branch() {
+  log_info "Checking currently active branch:"
+
+  local current_branch=$(compare_active_branch 'master')
+  if [ "$current_branch" = 'master' ] ; then
+    log_info "OK:   branch master active"
+  else
+    log_info "ACTION_NEEDED: branch '$current_branch' active - please switch to branch 'master'"
+  fi
+}
+
 check_push() {
   if type -p execute_check_shared_storage &>/dev/null ; then
     log_debug "execute_check_shared_storage function, action 'push'"
@@ -164,6 +175,7 @@ check_pending_build() {
 
 if [ -z "${1:-}" ] ; then
   check_local_state
+  check_branch
   check_push
   check_etc_state
   check_pending_build