[tor-commits] [rbm/master] Bug 29572: Update the test before running git checkout --detach

[gk at torproject.org]

commit 70d1ff3e7c1c5c69a1b4cdb61ee1b6b9e2a9bc4a
Author: Nicolas Vigier <boklm at torproject.org>
Date:   Mon Mar 11 11:26:48 2019 +0100

    Bug 29572: Update the test before running git checkout --detach
    
    The reason we don't run |git checkout --detach| in all cases is that it
    fails when we cloned a repository without a master branch. To avoid
    running it in this case, we were checking if HEAD is pointing to a
    branch which has a corresponding file in the .git directory.
    
    However it seems there are other cases where HEAD is pointing to a
    branch which does not have a corresponding file in the .git directory.
    Instead we now check that |git rev-parse --verify HEAD| does not return
    an error, in which case we assume that |git checkout --detach| will not
    produce an error too.
---
 lib/RBM.pm | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/lib/RBM.pm b/lib/RBM.pm
index 3ef20ae..1400700 100644
--- a/lib/RBM.pm
+++ b/lib/RBM.pm
@@ -397,9 +397,8 @@ sub git_clone_fetch_chdir {
     if (git_need_fetch($project, $options)) {
         system('git', 'remote', 'set-url', 'origin', $git_url) == 0
                 || exit_error "Error setting git remote";
-        my ($ref, undef, $success) = capture_exec('git', 'symbolic-ref', 'HEAD');
-        chomp $ref;
-        if ($success && -e ".git/$ref") {
+        my (undef, undef, $success) = capture_exec('git', 'rev-parse', '--verify', 'HEAD');
+        if ($success) {
             system('git', 'checkout', '-q', '--detach') == 0
                 || exit_error "Error running git checkout --detach";
         }