On Fri, Jul 31, 2015 at 1:06 PM, David Turner <dturner@xxxxxxxxxxxxxxxx> wrote:
> Add a function ref_type, which categorizes refs as per-worktree,
> pseudoref, or normal ref.
For per-worktree refs, you probably should follow common_list[] in
path.c because that's how file-based ref namespace is splitted between
per-repo and per-worktree, even though just as simple as "everything
outside refs/ is per-worktree" (with an exception of NOTES_MERGE_REF,
which should be on the list as well). At least the two should be
aligned so that the default file-based backend works the same way as
new backends.
Going further, I think you need to pass the "worktree identifier" to
ref backend, at least in ref_transaction_begin_fn. Each backend is
free to store per-worktree refs however it wants. Of course if I ask
for refs/foo of worktree A, you should not return me refs/foo of
worktree B. ref_transaction_begin_fn can return a fault code if it
does not support multiple worktrees, which is fine.
> Later, we will use this in refs.c to treat pseudorefs specially.
> Alternate ref backends may use it to treat both pseudorefs and
> per-worktree refs differently.
I'm not so sure that this can't be hidden behind backends and they can
have total control on falling back to file-based, or store them in
some secondary storage. I haven't re-read your discussion with Junio
yet (only skimmed through long ago) so I may be missing some important
points.
>
> Signed-off-by: David Turner <dturner@xxxxxxxxxxxxxxxx>
> ---
> refs.c | 26 ++++++++++++++++++++++++++
> refs.h | 8 ++++++++
> 2 files changed, 34 insertions(+)
>
> diff --git a/refs.c b/refs.c
> index 0b96ece..0f87884 100644
> --- a/refs.c
> +++ b/refs.c
> @@ -2848,6 +2848,32 @@ static int delete_ref_loose(struct ref_lock *lock, int flag, struct strbuf *err)
> return 0;
> }
>
> +static int is_per_worktree_ref(const char *refname)
> +{
> + return !strcmp(refname, "HEAD");
> +}
> +
> +static int is_pseudoref_syntax(const char *refname)
> +{
> + const char *c;
> +
> + for (c = refname; *c; c++) {
> + if (!isupper(*c) && *c != '-' && *c != '_')
> + return 0;
> + }
> +
> + return 1;
> +}
> +
> +enum ref_type ref_type(const char *refname)
> +{
> + if (is_per_worktree_ref(refname))
> + return REF_TYPE_PER_WORKTREE;
> + if (is_pseudoref_syntax(refname))
> + return REF_TYPE_PSEUDOREF;
> + return REF_TYPE_NORMAL;
> +}
> +
> int delete_ref(const char *refname, const unsigned char *old_sha1,
> unsigned int flags)
> {
> diff --git a/refs.h b/refs.h
> index e4e46c3..dca4fb5 100644
> --- a/refs.h
> +++ b/refs.h
> @@ -445,6 +445,14 @@ extern int parse_hide_refs_config(const char *var, const char *value, const char
>
> extern int ref_is_hidden(const char *);
>
> +enum ref_type {
> + REF_TYPE_PER_WORKTREE,
> + REF_TYPE_PSEUDOREF,
> + REF_TYPE_NORMAL,
> +};
> +
> +enum ref_type ref_type(const char *refname);
> +
> enum expire_reflog_flags {
> EXPIRE_REFLOGS_DRY_RUN = 1 << 0,
> EXPIRE_REFLOGS_UPDATE_REF = 1 << 1,
> --
> 2.0.4.315.gad8727a-twtrsrc
>
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--
Duy
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