Allow to create tarballs on detached branch

For example, for a particular git tag

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 2c76932134)

create_all_tarballs

@@ -39,7 +39,7 @@ if [[ ! -e .git ]] ||
 fi
 
 # Check remote branch
-branch=`git branch --contains HEAD | grep -v "no branch" | head -n1 | cut -c 3-`
+branch=`git branch --contains HEAD | egrep -v "no branch|detached" | head -n1 | cut -c 3-`
 if [[ -z "$branch" ]] ||
    [[ -z "`git rev-parse --symbolic-full-name --remotes=\"*/$branch\"`" ]]; then
         echo "There is not active upstream branch.  Exiting..."

create_tarball

@@ -27,7 +27,7 @@ if [[ ! -e .git ]] ||
 fi
 
 # Check remote branch
-branch=`git branch --contains HEAD | grep -v "no branch" | head -n1 | cut -c 3-`
+branch=`git branch --contains HEAD | egrep -v "no branch|detached" | head -n1 | cut -c 3-`
 if [[ -z "$branch" ]] ||
    [[ -z "`git rev-parse --symbolic-full-name --remotes=\"*/$branch\"`" ]]; then
         echo "There is not active upstream branch.  Exiting..."