>From 9f9b9010cb0b8c2874428d2f4bd21f06f747bfee Mon Sep 17 00:00:00 2001
From: Kenneth Cochran <kenneth.cochran101@xxxxxxxxx>
Date: Sun, 3 Mar 2019 15:34:20 -0600
Subject: [RFC PATCH 3/4] worktree: symref should be found anywhere in chain
Cc: Sahil Dua <sahildua2305@xxxxxxxxx>,
Duy Nguyen <pclouds@xxxxxxxxx>,
Jeff King <peff@xxxxxxxx>
Currently, when searching for a shared symref, a symref chain is
fully dereferenced before checking the name. This poses problems for
`git branch -d` which will happily delete a checked out symref.
The existing behaviour (recognizing a non-symbolic ref by the same name)
still exists, but it will now also find any symref that is in between the
starting symref and the first non-symbolic ref.
Concretely, for the following chain
HEAD -> symref1 -> symref2 -> master
previously the function was only able to find master.
With these changes applied, it will be able to find any of the above references.
Signed-off-by: Kenneth Cochran <kenneth.cochran101@xxxxxxxxx>
---
t/t3207-branch-alias.sh | 13 +++++++++++++
worktree.c | 18 ++++++++++++------
2 files changed, 25 insertions(+), 6 deletions(-)
diff --git a/t/t3207-branch-alias.sh b/t/t3207-branch-alias.sh
index 9d4c8c2914..c1edeed4eb 100755
--- a/t/t3207-branch-alias.sh
+++ b/t/t3207-branch-alias.sh
@@ -55,4 +55,17 @@ test_expect_success 'git branch --alias refuses to overwrite existing symref' '
test_must_fail git branch --alias syme
'
+test_expect_success 'git branch -d refuses to delete a checked out symref' '
+ git branch --alias symd &&
+ git checkout symd &&
+ test_must_fail git branch -d symd
+'
+
+test_expect_success 'git branch -d refuses to delete an indirectly checked out symref' '
+ git symbolic-ref refs/heads/symd2 refs/heads/symd &&
+ git checkout symd2 &&
+ test_must_fail git branch -d symd2 &&
+ test_must_fail git branch -d symd
+'
+
test_done
diff --git a/worktree.c b/worktree.c
index d6a0ee7f73..b58325c6c1 100644
--- a/worktree.c
+++ b/worktree.c
@@ -387,6 +387,17 @@ int is_worktree_being_bisected(const struct worktree *wt,
return found_rebase;
}
+static int find_symref_by_name(const char *ref_name, const struct object_id *oid,
+ int flags, void *cb_data)
+{
+ const char *target = (const char *)cb_data;
+
+ if ((flags & REF_ISSYMREF) && !strcmp(target, ref_name))
+ return 1;
+ else
+ return 0;
+}
+
/*
* note: this function should be able to detect shared symref even if
* HEAD is temporarily detached (e.g. in the middle of rebase or
@@ -406,9 +417,7 @@ const struct worktree *find_shared_symref(const char *symref,
for (i = 0; worktrees[i]; i++) {
struct worktree *wt = worktrees[i];
- const char *symref_target;
struct ref_store *refs;
- int flags;
if (wt->is_bare)
continue;
@@ -425,10 +434,7 @@ const struct worktree *find_shared_symref(const char *symref,
}
refs = get_worktree_ref_store(wt);
- symref_target = refs_resolve_ref_unsafe(refs, symref, 0,
- NULL, &flags);
- if ((flags & REF_ISSYMREF) &&
- symref_target && !strcmp(symref_target, target)) {
+ if(refs_for_each_ref_in_chain(refs, find_symref_by_name, (void *)target, symref)) {
existing = wt;
break;
}
--
2.17.1
