On 04/25/2014 06:14 PM, Ronnie Sahlberg wrote:
> Change ref_transaction_commit to take a pointer to a pointer for the
> transaction. This allows us to clear the transaction pointer from within
> ref_transaction_commit so that it becomes NULL in the caller.
>
> This makes transaction handling in the callers much nicer since instead of
> having to write horrible code like :
> t = ref_transaction_begin();
> if ((!t ||
> ref_transaction_update(t, refname, sha1, oldval, flags,
> !!oldval)) ||
> (ref_transaction_commit(t, action, &err) && !(t = NULL))) {
> ref_transaction_rollback(t);
>
> we can now just do the much nicer
> t = ref_transaction_begin();
> if (!t ||
> ref_transaction_update(t, refname, sha1, oldval, flags,
> !!oldval) ||
> ref_transaction_commit(&t, action, &err)) {
> ref_transaction_rollback(t);
I understand the motivation for this change, but passing
pointer-to-pointer is unconventional in a case like this. Unfortunately
I ran out of steam for the night before I could think about alternatives.
Regarding patches 01-18, I agree with Jonathan's comments and made a few
of my own. I definitely don't think that code like "!(t = NULL)" should
stay in our code base as more than a transitional state. But I'd have
to play with the alternatives before I can form an opinion on your
suggestion in this patch.
Thanks for working on this!
Michael
> Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
> ---
> branch.c | 4 ++--
> builtin/commit.c | 2 +-
> builtin/replace.c | 2 +-
> builtin/tag.c | 2 +-
> builtin/update-ref.c | 2 +-
> fast-import.c | 7 +++----
> refs.c | 18 ++++++++++--------
> refs.h | 3 ++-
> sequencer.c | 7 +++----
> 9 files changed, 24 insertions(+), 23 deletions(-)
>
> diff --git a/branch.c b/branch.c
> index 23cde1e..5d68467 100644
> --- a/branch.c
> +++ b/branch.c
> @@ -303,14 +303,14 @@ void create_branch(const char *head,
> if (!transaction ||
> ref_transaction_update(transaction, ref.buf, sha1,
> NULL, 0, 0) ||
> - ref_transaction_commit(transaction, msg, &err))
> + ref_transaction_commit(&transaction, msg, &err))
> die_errno(_("%s: failed to write ref: %s"),
> ref.buf, err);
> } else {
> if (!transaction ||
> ref_transaction_create(transaction, ref.buf, sha1,
> 0) ||
> - ref_transaction_commit(transaction, msg, &err))
> + ref_transaction_commit(&transaction, msg, &err))
> die_errno(_("%s: failed to write ref: %s"),
> ref.buf, err);
> }
> diff --git a/builtin/commit.c b/builtin/commit.c
> index 7e4c306..3142827 100644
> --- a/builtin/commit.c
> +++ b/builtin/commit.c
> @@ -1682,7 +1682,7 @@ int cmd_commit(int argc, const char **argv, const char
> *prefix)
> current_head ?
> current_head->object.sha1 : NULL,
> 0, !!current_head) ||
> - ref_transaction_commit(transaction, sb.buf, &err)) {
> + ref_transaction_commit(&transaction, sb.buf, &err)) {
> rollback_index_files();
> die(_("HEAD: cannot update ref: %s"), err);
> }
> diff --git a/builtin/replace.c b/builtin/replace.c
> index cf0f56d..51e9ddf 100644
> --- a/builtin/replace.c
> +++ b/builtin/replace.c
> @@ -162,7 +162,7 @@ static int replace_object(const char *object_ref, const
> char *replace_ref,
> if (!transaction ||
> ref_transaction_update(transaction, ref, repl, prev,
> 0, !is_null_sha1(prev)) ||
> - ref_transaction_commit(transaction, NULL, &err))
> + ref_transaction_commit(&transaction, NULL, &err))
> die(_("%s: failed to replace ref: %s"), ref, err);
>
> return 0;
> diff --git a/builtin/tag.c b/builtin/tag.c
> index dd53fb4..60b57a1 100644
> --- a/builtin/tag.c
> +++ b/builtin/tag.c
> @@ -646,7 +646,7 @@ int cmd_tag(int argc, const char **argv, const char
> *prefix)
> if (!transaction ||
> ref_transaction_update(transaction, ref.buf, object, prev,
> 0, !is_null_sha1(prev)) ||
> - ref_transaction_commit(transaction, NULL, &err))
> + ref_transaction_commit(&transaction, NULL, &err))
> die(_("%s: cannot update the ref: %s"), ref.buf, err);
> if (force && !is_null_sha1(prev) && hashcmp(prev, object))
> printf(_("Updated tag '%s' (was %s)\n"), tag,
> find_unique_abbrev(prev, DEFAULT_ABBREV));
> diff --git a/builtin/update-ref.c b/builtin/update-ref.c
> index a600ab3..4a0901d 100644
> --- a/builtin/update-ref.c
> +++ b/builtin/update-ref.c
> @@ -373,7 +373,7 @@ int cmd_update_ref(int argc, const char **argv, const
> char *prefix)
> if (end_null)
> line_termination = '\0';
> update_refs_stdin();
> - if (ref_transaction_commit(transaction, msg, &err))
> + if (ref_transaction_commit(&transaction, msg, &err))
> die("update_ref failed: %s", err);
> return 0;
> }
> diff --git a/fast-import.c b/fast-import.c
> index a2b05fa..3ce2f47 100644
> --- a/fast-import.c
> +++ b/fast-import.c
> @@ -1703,11 +1703,10 @@ static int update_branch(struct branch *b)
> }
> }
> transaction = ref_transaction_begin();
> - if ((!transaction ||
> + if (!transaction ||
> ref_transaction_update(transaction, b->name, b->sha1, old_sha1,
> - 0, 1)) ||
> - (ref_transaction_commit(transaction, msg, &err) &&
> - !(transaction = NULL))) {
> + 0, 1) ||
> + ref_transaction_commit(&transaction, msg, &err)) {
> ref_transaction_rollback(transaction);
> return error("Unable to update branch %s: %s", b->name, err);
> }
> diff --git a/refs.c b/refs.c
> index ffa9c83..0b60250 100644
> --- a/refs.c
> +++ b/refs.c
> @@ -3401,10 +3401,10 @@ int update_ref(const char *action, const char
> *refname,
> char *err = NULL;
>
> t = ref_transaction_begin();
> - if ((!t ||
> + if (!t ||
> ref_transaction_update(t, refname, sha1, oldval, flags,
> - !!oldval)) ||
> - (ref_transaction_commit(t, action, &err) && !(t = NULL))) {
> + !!oldval) ||
> + ref_transaction_commit(&t, action, &err)) {
> const char *str = "update_ref failed for ref '%s': %s";
>
> ref_transaction_rollback(t);
> @@ -3444,16 +3444,17 @@ static int ref_update_reject_duplicates(struct
> ref_update **updates, int n,
> return 0;
> }
>
> -int ref_transaction_commit(struct ref_transaction *transaction,
> +int ref_transaction_commit(struct ref_transaction **transaction,
> const char *msg, char **err)
> {
> int ret = 0, delnum = 0, i;
> const char **delnames;
> - int n = transaction->nr;
> - struct ref_update **updates = transaction->updates;
> + int n = (*transaction)->nr;
> + struct ref_update **updates = (*transaction)->updates;
>
> if (!n) {
> - ref_transaction_free(transaction);
> + ref_transaction_free(*transaction);
> + *transaction = NULL;
> return 0;
> }
>
> @@ -3527,7 +3528,8 @@ cleanup:
> if (updates[i]->lock)
> unlock_ref(updates[i]->lock);
> free(delnames);
> - ref_transaction_free(transaction);
> + ref_transaction_free(*transaction);
> + *transaction = NULL;
> return ret;
> }
>
> diff --git a/refs.h b/refs.h
> index 8135131..85127f2 100644
> --- a/refs.h
> +++ b/refs.h
> @@ -270,8 +270,9 @@ int ref_transaction_delete(struct ref_transaction
> *transaction,
> * problem. The ref_transaction is freed by this function.
> * If error is non-NULL it will return an error string that describes
> * why a commit failed. This string must be free()ed by the caller.
> + * *transaction is reset to NULL in this call.
> */
> -int ref_transaction_commit(struct ref_transaction *transaction,
> +int ref_transaction_commit(struct ref_transaction **transaction,
> const char *msg, char **err);
>
> /** Lock a ref and then write its file */
> diff --git a/sequencer.c b/sequencer.c
> index 7d59f58..3f6eced 100644
> --- a/sequencer.c
> +++ b/sequencer.c
> @@ -283,11 +283,10 @@ static int fast_forward_to(const unsigned char *to,
> const unsigned char *from,
> strbuf_addf(&sb, "%s: fast-forward", action_name(opts));
>
> transaction = ref_transaction_begin();
> - if ((!transaction ||
> + if (!transaction ||
> ref_transaction_update(transaction, "HEAD", to, from,
> - 0, !unborn)) ||
> - (ref_transaction_commit(transaction, sb.buf, &err) &&
> - !(transaction = NULL))) {
> + 0, !unborn) ||
> + ref_transaction_commit(&transaction, sb.buf, &err)) {
> ref_transaction_rollback(transaction);
> strbuf_release(&sb);
> return error(_("HEAD: Could not fast-forward: %s\n"), err);
>
--
Michael Haggerty
mhag...@alum.mit.edu
http://softwareswirl.blogspot.com/
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