Make git-{pull,rebase} message without tracking information friendlier

The current message is too long and at too low a level for anybody
to understand it if they don't know about the configuration format
already.

The text about setting up a remote is superfluous and doesn't help
understand or recover from the error that has happened.  Show the
usage more prominently and explain how to set up the tracking
information. If there is only one remote, that name is used instead
of the generic <remote>.

Also simplify the message we print on detached HEAD to remove
unnecessary information which is better left for the documentation.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 20 insertions, 23 deletions

diff --git a/git-parse-remote.sh b/git-parse-remote.sh
index b24119d..484b2e6 100644
--- a/git-parse-remote.sh
+++ b/git-parse-remote.sh
@@ -57,34 +57,31 @@ error_on_missing_default_upstream () {
 	op_prep="$3"
 	example="$4"
 	branch_name=$(git symbolic-ref -q HEAD)
+	# If there's only one remote, use that in the suggestion
+	remote="<remote>"
+	if test $(git remote | wc -l) = 1
+	then
+		remote=$(git remote)
+	fi
+
 	if test -z "$branch_name"
 	then
-		echo "You are not currently on a branch, so I cannot use any
-'branch.<branchname>.merge' in your configuration file.
-Please specify which branch you want to $op_type $op_prep on the command
-line and try again (e.g. '$example').
-See git-${cmd}(1) for details."
+		echo "You are not currently on a branch. Please specify which
+branch you want to $op_type $op_prep. See git-${cmd}(1) for details.
+
+    $example
+"
 	else
-		echo "You asked me to $cmd without telling me which branch you
-want to $op_type $op_prep, and 'branch.${branch_name#refs/heads/}.merge' in
-your configuration file does not tell me, either. Please
-specify which branch you want to use on the command line and
-try again (e.g. '$example').
-See git-${cmd}(1) for details.
+		echo "There is no tracking information for the current branch.
+Please specify which branch you want to $op_type $op_prep.
+See git-${cmd}(1) for details
+
+    $example
 
-If you often $op_type $op_prep the same branch, you may want to
-use something like the following in your configuration file:
-    [branch \"${branch_name#refs/heads/}\"]
-    remote = <nickname>
-    merge = <remote-ref>"
-		test rebase = "$op_type" &&
-		echo "    rebase = true"
-		echo "
-    [remote \"<nickname>\"]
-    url = <url>
-    fetch = <refspec>
+If you wish to set tracking information for this branch you can do so with:
 
-See git-config(1) for details."
+    git branch --set-upstream ${branch_name#refs/heads/} $remote/<branch>
+"
 	fi
 	exit 1
 }