Currently, when no (valid) upstream is configured for a branch, you get
an error like:

  $ git show @{u}
  error: No upstream configured for branch 'upstream-error'
  error: No upstream configured for branch 'upstream-error'
  fatal: ambiguous argument '@{u}': unknown revision or path not in the working 
tree.
  Use '--' to separate paths from revisions, like this:
  'git <command> [<revision>...] -- [<file>...]'

The "error: " line actually appears twice, and the rest of the error
message is useless.  In sha1_name.c:interpret_branch_name(), there is
really no point in processing further if @{u} couldn't be resolved, and
we might as well die() instead of returning an error().  After making
this change, you get:

  $ git show @{u}
  fatal: No upstream configured for branch 'upstream-error'

Also tweak a few tests in t1507 to expect this output.

To justify that this change is safe, consider that all callers of
interpret_branch_name() have to fall in two categories:

1. Direct end-user facing applications like [rev-parse, show] calling in
   with end-user data (in which case the data can contain "@{u}").
   Failing immediately is the right thing to do: the only difference is
   that the die() happens in interpret_branch_name() instead of
   die_verify_filename(), and this is desirable.

2. Callers calling in with programmatic data, and expecting the function
   to return and not die().  In this case, why would anyone ever
   construct a string containing "@{u}" programmatically in the first
   place?  A grep reveals that no part of the code hard-codes either
   "@{u}" or "@{upstream}".  So, these callers will never hit the
   codepath touched by the patch.

Signed-off-by: Ramkumar Ramachandra <artag...@gmail.com>
---
 sha1_name.c                   | 11 +++++------
 t/t1507-rev-parse-upstream.sh | 15 +++++----------
 2 files changed, 10 insertions(+), 16 deletions(-)

diff --git a/sha1_name.c b/sha1_name.c
index 3820f28..61f5a34 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -1033,15 +1033,14 @@ int interpret_branch_name(const char *name, struct 
strbuf *buf)
         * points to something different than a branch.
         */
        if (!upstream)
-               return error(_("HEAD does not point to a branch"));
+               die(_("HEAD does not point to a branch"));
        if (!upstream->merge || !upstream->merge[0]->dst) {
                if (!ref_exists(upstream->refname))
-                       return error(_("No such branch: '%s'"), cp);
+                       die(_("No such branch: '%s'"), cp);
                if (!upstream->merge)
-                       return error(_("No upstream configured for branch 
'%s'"),
-                                    upstream->name);
-               return error(
-                       _("Upstream branch '%s' not stored as a remote-tracking 
branch"),
+                       die(_("No upstream configured for branch '%s'"),
+                               upstream->name);
+               die(_("Upstream branch '%s' not stored as a remote-tracking 
branch"),
                        upstream->merge[0]->src);
        }
        free(cp);
diff --git a/t/t1507-rev-parse-upstream.sh b/t/t1507-rev-parse-upstream.sh
index b27a720..2a19e79 100755
--- a/t/t1507-rev-parse-upstream.sh
+++ b/t/t1507-rev-parse-upstream.sh
@@ -129,8 +129,7 @@ test_expect_success 'branch@{u} works when tracking a local 
branch' '
 
 test_expect_success 'branch@{u} error message when no upstream' '
        cat >expect <<-EOF &&
-       error: No upstream configured for branch ${sq}non-tracking${sq}
-       fatal: Needed a single revision
+       fatal: No upstream configured for branch ${sq}non-tracking${sq}
        EOF
        error_message non-tracking@{u} 2>actual &&
        test_i18ncmp expect actual
@@ -138,8 +137,7 @@ test_expect_success 'branch@{u} error message when no 
upstream' '
 
 test_expect_success '@{u} error message when no upstream' '
        cat >expect <<-EOF &&
-       error: No upstream configured for branch ${sq}master${sq}
-       fatal: Needed a single revision
+       fatal: No upstream configured for branch ${sq}master${sq}
        EOF
        test_must_fail git rev-parse --verify @{u} 2>actual &&
        test_i18ncmp expect actual
@@ -147,8 +145,7 @@ test_expect_success '@{u} error message when no upstream' '
 
 test_expect_success 'branch@{u} error message with misspelt branch' '
        cat >expect <<-EOF &&
-       error: No such branch: ${sq}no-such-branch${sq}
-       fatal: Needed a single revision
+       fatal: No such branch: ${sq}no-such-branch${sq}
        EOF
        error_message no-such-branch@{u} 2>actual &&
        test_i18ncmp expect actual
@@ -156,8 +153,7 @@ test_expect_success 'branch@{u} error message with misspelt 
branch' '
 
 test_expect_success '@{u} error message when not on a branch' '
        cat >expect <<-EOF &&
-       error: HEAD does not point to a branch
-       fatal: Needed a single revision
+       fatal: HEAD does not point to a branch
        EOF
        git checkout HEAD^0 &&
        test_must_fail git rev-parse --verify @{u} 2>actual &&
@@ -166,8 +162,7 @@ test_expect_success '@{u} error message when not on a 
branch' '
 
 test_expect_success 'branch@{u} error message if upstream branch not fetched' '
        cat >expect <<-EOF &&
-       error: Upstream branch ${sq}refs/heads/side${sq} not stored as a 
remote-tracking branch
-       fatal: Needed a single revision
+       fatal: Upstream branch ${sq}refs/heads/side${sq} not stored as a 
remote-tracking branch
        EOF
        error_message bad-upstream@{u} 2>actual &&
        test_i18ncmp expect actual
-- 
1.8.3.rc3.17.gd95ec6c.dirty

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