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update-ref: allow creation of multiple transactions

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While git-update-ref has recently grown commands which allow interactive
control of transactions in e48cf33b61 (update-ref: implement interactive
transaction handling, 2020-04-02), it is not yet possible to create
multiple transactions in a single session. To do so, one currently still
needs to invoke the executable multiple times.

This commit addresses this shortcoming by allowing the "start" command
to create a new transaction if the current transaction has already been
either committed or aborted.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt 2020-11-13 09:12:36 +01:00 committed by Junio C Hamano
parent c0e1726127
commit 262a4d28fe
3 changed files with 64 additions and 2 deletions
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3
Documentation/git-update-ref.txt
View File

@ -125,7 +125,8 @@ option::
start::
Start a transaction. In contrast to a non-transactional session, a
transaction will automatically abort if the session ends without an
explicit commit.
explicit commit. This command may create a new empty transaction when
the current one has been committed or aborted already.
prepare::
Prepare to commit the transaction. This will create lock files for all

13
builtin/update-ref.c
View File

@ -446,7 +446,18 @@ static void update_refs_stdin(void)
state = cmd->state;
break;
case UPDATE_REFS_CLOSED:
die("transaction is closed");
if (cmd->state != UPDATE_REFS_STARTED)
die("transaction is closed");
/*
* Open a new transaction if we're currently closed and
* get a "start".
*/
state = cmd->state;
transaction = ref_transaction_begin(&err);
if (!transaction)
die("%s", err.buf);
break;
}

50
t/t1400-update-ref.sh
View File

@ -1533,4 +1533,54 @@ test_expect_success 'transaction with prepare aborts by default' '
test_must_fail git show-ref --verify -q $b
'
test_expect_success 'transaction can commit multiple times' '
cat >stdin <<-EOF &&
start
create refs/heads/branch-1 $A
commit
start
create refs/heads/branch-2 $B
commit
EOF
git update-ref --stdin <stdin >actual &&
printf "%s: ok\n" start commit start commit >expect &&
test_cmp expect actual &&
echo "$A" >expect &&
git rev-parse refs/heads/branch-1 >actual &&
test_cmp expect actual &&
echo "$B" >expect &&
git rev-parse refs/heads/branch-2 >actual &&
test_cmp expect actual
'
test_expect_success 'transaction can create and delete' '
cat >stdin <<-EOF &&
start
create refs/heads/create-and-delete $A
commit
start
delete refs/heads/create-and-delete $A
commit
EOF
git update-ref --stdin <stdin >actual &&
printf "%s: ok\n" start commit start commit >expect &&
test_must_fail git show-ref --verify refs/heads/create-and-delete
'
test_expect_success 'transaction can commit after abort' '
cat >stdin <<-EOF &&
start
create refs/heads/abort $A
abort
start
create refs/heads/abort $A
commit
EOF
git update-ref --stdin <stdin >actual &&
printf "%s: ok\n" start abort start commit >expect &&
echo "$A" >expect &&
git rev-parse refs/heads/abort >actual &&
test_cmp expect actual
'
test_done