Re: [PATCH 16/18] count-objects: report alternates via verbose mode

> There's no way to get the list of alternates that git
> computes internally; our tests only infer it based on which
> objects are available. In addition to testing, knowing this
> list may be helpful for somebody debugging their alternates
> setup.
>
> Let's add it to the "count-objects -v" output. We could give
> it a separate flag, but there's not really any need.
> "count-objects -v" is already a debugging catch-all for the
> object database, its output is easily extensible to new data
> items, and printing the alternates is not expensive (we
> already had to find them to count the objects).
>

> Signed-off-by: Jeff King <peff@peff.net>
> ---
>  Documentation/git-count-objects.txt |  5 +++++
>  builtin/count-objects.c             | 10 ++++++++++
>  t/t5613-info-alternate.sh           | 10 ++++++++++
>  3 files changed, 25 insertions(+)
>
> diff --git a/Documentation/git-count-objects.txt b/Documentation/git-count-objects.txt
> index 2ff3568..cb9b4d2 100644
> --- a/Documentation/git-count-objects.txt
> +++ b/Documentation/git-count-objects.txt
> @@ -38,6 +38,11 @@ objects nor valid packs
>  +
>  size-garbage: disk space consumed by garbage files, in KiB (unless -H is
>  specified)
> ++
> +alternate: absolute path of alternate object databases; may appear
> +multiple times, one line per path. Note that if the path contains
> +non-printable characters, it may be surrounded by double-quotes and
> +contain C-style backslashed escape sequences.
>
>  -H::
>  --human-readable::
> diff --git a/builtin/count-objects.c b/builtin/count-objects.c
> index ba92919..a700409 100644
> --- a/builtin/count-objects.c
> +++ b/builtin/count-objects.c
> @@ -8,6 +8,7 @@
>  #include "dir.h"
>  #include "builtin.h"
>  #include "parse-options.h"
> +#include "quote.h"
>
>  static unsigned long garbage;
>  static off_t size_garbage;
> @@ -73,6 +74,14 @@ static int count_cruft(const char *basename, const char *path, void *data)
>         return 0;
>  }
>
> +static int print_alternate(struct alternate_object_database *alt, void *data)
> +{
> +       printf("alternate: ");
> +       quote_c_style(alt->path, NULL, stdout, 0);
> +       putchar('\n');
> +       return 0;
> +}
> +
>  static char const * const count_objects_usage[] = {
>         N_("git count-objects [-v] [-H | --human-readable]"),
>         NULL
> @@ -140,6 +149,7 @@ int cmd_count_objects(int argc, const char **argv, const char *prefix)
>                 printf("prune-packable: %lu\n", packed_loose);
>                 printf("garbage: %lu\n", garbage);
>                 printf("size-garbage: %s\n", garbage_buf.buf);
> +               foreach_alt_odb(print_alternate, NULL);
>                 strbuf_release(&loose_buf);
>                 strbuf_release(&pack_buf);
>                 strbuf_release(&garbage_buf);
> diff --git a/t/t5613-info-alternate.sh b/t/t5613-info-alternate.sh
> index b393613..74f6770 100755
> --- a/t/t5613-info-alternate.sh
> +++ b/t/t5613-info-alternate.sh
> @@ -39,6 +39,16 @@ test_expect_success 'preparing third repository' '
>         )
>  '
>
> +test_expect_success 'count-objects shows the alternates' '
> +       cat >expect <<-EOF &&
> +       alternate: $(pwd)/B/.git/objects
> +       alternate: $(pwd)/A/.git/objects
> +       EOF
> +       git -C C count-objects -v >actual &&
> +       grep ^alternate: actual >actual.alternates &&
> +       test_cmp expect actual.alternates
> +'
> +
>  # Note: These tests depend on the hard-coded value of 5 as "too deep". We start
>  # the depth at 0 and count links, not repositories, so in a chain like:
>  #
> --
> 2.10.0.618.g82cc264
>