The code handling %(upstream:track) and %(upstream:trackshort) assumed
it always had a valid branch that had been sanitized earlier in
populate_value(), and thus did not check the return value of the call to
stat_tracking_info().
While there is indeed some sanitization code that basically corresponds
to stat_tracking_info() returning 0 (no base branch set), the function
can also return -1 when the base branch did exist but has since then
been deleted.
In this case, num_ours and num_theirs had undefined values and a call to
`git for-each-ref --format="%(upstream:track)"` could print spurious
values such as
[behind -111794512]
[ahead 38881640, behind 5103867]
even for repositories with one single commit.
We now properly verify stat_tracking_info()'s return value and do not
print anything if it returns -1. This behavior also matches the
documentation ("has no effect if the ref does not have tracking
information associated with it").
Signed-off-by: Raphael Kubo da Costa <raphael.kubo.da.costa@xxxxxxxxx>
---
v2: Use `test_when_finished' to clean up the "parent_gone" branch.
builtin/for-each-ref.c | 11 +++++++++--
t/t6300-for-each-ref.sh | 15 +++++++++++++++
2 files changed, 24 insertions(+), 2 deletions(-)
diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c
index 603a90e..52e6323 100644
--- a/builtin/for-each-ref.c
+++ b/builtin/for-each-ref.c
@@ -717,7 +717,10 @@ static void populate_value(struct refinfo *ref)
starts_with(name, "upstream")) {
char buf[40];
- stat_tracking_info(branch, &num_ours, &num_theirs);
+ if (stat_tracking_info(branch, &num_ours,
+ &num_theirs) != 1)
+ continue;
+
if (!num_ours && !num_theirs)
v->s = "";
else if (!num_ours) {
@@ -735,7 +738,11 @@ static void populate_value(struct refinfo *ref)
} else if (!strcmp(formatp, "trackshort") &&
starts_with(name, "upstream")) {
assert(branch);
- stat_tracking_info(branch, &num_ours, &num_theirs);
+
+ if (stat_tracking_info(branch, &num_ours,
+ &num_theirs) != 1)
+ continue;
+
if (!num_ours && !num_theirs)
v->s = "=";
else if (!num_ours)
diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index bda354c..df9c3bd 100755
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -335,6 +335,21 @@ test_expect_success 'Check that :track[short] cannot be used with other atoms' '
'
cat >expected <<EOF
+
+
+EOF
+
+test_expect_success 'Check that :track[short] works when upstream is gone' '
+ git branch --track to_delete master &&
+ git branch --track parent_gone to_delete &&
+ git branch -D to_delete &&
+ git for-each-ref --format="%(upstream:track)" refs/heads/parent_gone >actual &&
+ git for-each-ref --format="%(upstream:trackshort)" refs/heads/parent_gone >>actual &&
+ test_when_finished "git branch -D parent_gone" &&
+ test_cmp expected actual
+'
+
+cat >expected <<EOF
$(git rev-parse --short HEAD)
EOF
--
2.1.4
--
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