On Thu, Jan 20 2022, Jonathan Tan wrote: > When creating the sparse-checkout file, Git does not create the leading > directory, "$GIT_DIR/info", if it does not exist. This causes problems > if the repository does not have that directory. Therefore, ensure that > the leading directory is created. > > This is the only "open" in builtin/sparse-checkout.c that does not have > a leading directory check. (The other one in write_patterns_and_update() > does.) > > Note that the test needs to explicitly specify a template when running > "git init" because the default template used in the tests has the > "info/" directory included. > > Signed-off-by: Jonathan Tan <jonathantanmy@xxxxxxxxxx> > --- > This problem is being discussed in [1], and we also noticed this problem > internally at $DAYJOB. Here's a fix. > > [1] https://lore.kernel.org/git/db6f47a3-0df3-505b-b391-6ca289fd61b5@xxxxxxxxx/ Thanks. This fix looks good to me. Looking at my [1] my preliminary analysis there wasn't correct, i.e. there are other cases where we get the "sparse_filename" that you don't cover here, but e.g. if you do: <your test> && rm -rf .git/info && git sparse-checkout add foo It looks like it will fail either way, so for those other codepaths we didn't need to ensure the .git/info. Still, it would be nice to have the fix test for those cases too, i.e. how various operations are expected to behave if the user were to rm -rf .git/info. That'll obviously yield a broken repo, but we should still try to handle it gracefully. 1. https://lore.kernel.org/git/211220.86zgovt9bi.gmgdl@xxxxxxxxxxxxxxxxxxx/ > --- > builtin/sparse-checkout.c | 3 +++ > t/t1091-sparse-checkout-builtin.sh | 7 +++++++ > 2 files changed, 10 insertions(+) > > diff --git a/builtin/sparse-checkout.c b/builtin/sparse-checkout.c > index 679c107036..2b0e1db2d2 100644 > --- a/builtin/sparse-checkout.c > +++ b/builtin/sparse-checkout.c > @@ -471,6 +471,9 @@ static int sparse_checkout_init(int argc, const char **argv) > FILE *fp; > > /* assume we are in a fresh repo, but update the sparse-checkout file */ > + if (safe_create_leading_directories(sparse_filename)) > + die(_("unable to create leading directories of %s"), > + sparse_filename); > fp = xfopen(sparse_filename, "w"); > if (!fp) > die(_("failed to open '%s'"), sparse_filename); > diff --git a/t/t1091-sparse-checkout-builtin.sh b/t/t1091-sparse-checkout-builtin.sh > index 42776984fe..dba0737599 100755 > --- a/t/t1091-sparse-checkout-builtin.sh > +++ b/t/t1091-sparse-checkout-builtin.sh > @@ -79,6 +79,13 @@ test_expect_success 'git sparse-checkout init' ' > check_files repo a > ' > > +test_expect_success 'git sparse-checkout init in empty repo' ' > + test_when_finished rm -rf empty-repo blank-template && > + mkdir blank-template && > + git init --template=blank-template empty-repo && > + git -C empty-repo sparse-checkout init > +' > + > test_expect_success 'git sparse-checkout list after init' ' > git -C repo sparse-checkout list >actual && > cat >expect <<-\EOF && You're using an overly verbose way to say "no templates, please". You can squash this in, i.e. --template= is an explicitly supported way to do that. diff --git a/t/t1091-sparse-checkout-builtin.sh b/t/t1091-sparse-checkout-builtin.sh index dba07375993..1fe741d9cd5 100755 --- a/t/t1091-sparse-checkout-builtin.sh +++ b/t/t1091-sparse-checkout-builtin.sh @@ -80,9 +80,8 @@ test_expect_success 'git sparse-checkout init' ' ' test_expect_success 'git sparse-checkout init in empty repo' ' - test_when_finished rm -rf empty-repo blank-template && - mkdir blank-template && - git init --template=blank-template empty-repo && + test_when_finished rm -rf empty-repo && + git init --template= empty-repo && git -C empty-repo sparse-checkout init '
