Re: [PATCH v3 1/1] upload-pack.c: fix filter spec quoting bug
On Tue, Jan 26 2021, Jacob Vosmaer wrote:
> This fixes a bug that occurs when you combine partial clone and
> uploadpack.packobjectshook. You can reproduce it as follows:
Let's:
* Refer to the commit we're fixing a bug in, i.e. Junio's mention of
10ac85c7 (upload-pack: add object filtering for partial clone,
2017-12-08) upthread.
* See also "imperative-mood" in SubmittingPatches. I.e. say "Fix a bug
in ..." not "This fixes ... can be reproduced as"
* uploadpack.packObjectsHook not uploadpack.packobjectshook except in C
code.
> git clone -u 'git -c uploadpack.allowfilter '\
> '-c uploadpack.packobjectshook=env '\
> 'upload-pack' --filter=blob:none --no-local \
> src.git dst.git
This and the output below would be more readable indented.
Show 12 quoted lines
> Be careful with the line endings because this has a long quoted string
> as the -u argument.
>
> The error I get when I run this is:
>
> Cloning into '/tmp/broken'...
> remote: fatal: invalid filter-spec ''blob:none''
> error: git upload-pack: git-pack-objects died with error.
> fatal: git upload-pack: aborting due to possible repository corruption on the remote side.
> remote: aborting due to possible repository corruption on the remote side.
> fatal: early EOF
> fatal: index-pack failed
> The problem is an unnecessary and harmful layer of quoting. I tried
> digging through the history of this function and I think this quoting
> was there from the start.
...So looked at "git log" but didn't try to check out 10ac85c7 and see if it had the same issue? If we're going to leave a note about this at all probably better to help future source spelunkers by being able to say the issue was there from the start.
Show 13 quoted lines
> My best guess is that it stems from a
> misunderstanding what use_shell=1 means. The code seems to assume it
> means "arguments get joined into one big string, then fed to /bin/sh".
> But that is not what it means: use_shell=1 means that the first
> argument in the arguments array may be a shell script and if so should
> be passed to /bin/sh. All other arguments are passed as normal
> arguments.
>
> The solution is simple: never quote the filter spec.
>
> This commit removes the conditional quoting and adds a test for
> partial clone in t5544.
>
Thanks for hacking this up! Hopefully the above is helpful and not too nitpicky. Mainly wanted to help you get future patches through more easily...
Show 44 quoted lines
> Signed-off-by: Jacob Vosmaer <jacob@gitlab.com>
> ---
> t/t5544-pack-objects-hook.sh | 9 +++++++++
> upload-pack.c | 9 +--------
> 2 files changed, 10 insertions(+), 8 deletions(-)
>
> diff --git a/t/t5544-pack-objects-hook.sh b/t/t5544-pack-objects-hook.sh
> index 4357af1525..f5ba663d64 100755
> --- a/t/t5544-pack-objects-hook.sh
> +++ b/t/t5544-pack-objects-hook.sh
> @@ -59,4 +59,13 @@ test_expect_success 'hook does not run from repo config' '
> test_path_is_missing .git/hook.stdout
> '
>
> +test_expect_success 'hook works with partial clone' '
> + clear_hook_results &&
> + test_config_global uploadpack.packObjectsHook ./hook &&
> + test_config_global uploadpack.allowFilter true &&
> + git clone --bare --no-local --filter=blob:none . dst.git &&
> + git -C dst.git rev-list --objects --missing=print HEAD >objects &&
> + grep "^?" objects
> +'
> +
> test_done
> diff --git a/upload-pack.c b/upload-pack.c
> index 3b66bf92ba..eae1fdbc55 100644
> --- a/upload-pack.c
> +++ b/upload-pack.c
> @@ -305,14 +305,7 @@ static void create_pack_file(struct upload_pack_data *pack_data,
> if (pack_data->filter_options.choice) {
> const char *spec =
> expand_list_objects_filter_spec(&pack_data->filter_options);
> - if (pack_objects.use_shell) {
> - struct strbuf buf = STRBUF_INIT;
> - sq_quote_buf(&buf, spec);
> - strvec_pushf(&pack_objects.args, "--filter=%s", buf.buf);
> - strbuf_release(&buf);
> - } else {
> - strvec_pushf(&pack_objects.args, "--filter=%s", spec);
> - }
> + strvec_pushf(&pack_objects.args, "--filter=%s", spec);
> }
> if (uri_protocols) {
> for (i = 0; i < uri_protocols->nr; i++)
Jeff King
