Hi,
inspired by recent discussions about handling transactions in
git-update-refs(1), this series implements proper transaction support in
`git update-refs --stdin`. The goal is to have an all-or-nothing
transaction where a user can queue multiple updates, verify that they
can be committed, and then finally either commits or aborts the
transaction. A typical session would look like the following:
# Start the transaction
> start
< start: ok
# Queue updates
> delete refs/heads/branch
> create refs/heads/another $OID1
# Prepare the transaction. git-update-ref will now try to allocate
# all locks and verify that references are at their expected values.
> prepare
< prepare: ok
# Commit the transaction. The user could also have said "abort" to
# roll back everything.
> commit
< commit: ok
The series builds on the already existing transaction support in refs.c
and exposes it to the user. The most important change that was required
to support this was to convert `git-update-ref --stdin` to handle input
linewise instead of trying to read it in full and only acting after
stdin was closed.
The series is structured as follows:
Patches 1-2: Preparatory patches which make sense as standalone
patches.
Patches 3-7: Preparatory patches that make it easier to convert to
reading commands in a line-wise fashion. No functional
changes are expected.
Patch 8: Conversion to read commands line-wise. No functional
changes are expected, except that Git builds up the transaction
while reading stdin instead of waiting for stdin to be closed
first.
Patch 9: Implementation of transactional commands.
All in all, the new transactional support will only be enabled if the
user invokes any the new commands "start", "prepare", "commit" or
"abort". In case he doesn't, no functional changes are expected.
Patrick
Patrick Steinhardt (9):
refs: fix segfault when aborting empty transaction
git-update-ref.txt: add missing word
strbuf: provide function to append whole lines
update-ref: organize commands in an array
update-ref: drop unused argument for `parse_refname`
update-ref: pass end pointer instead of strbuf
update-ref: move transaction handling into `update_refs_stdin()`
update-ref: read commands in a line-wise fashion
update-ref: implement interactive transaction handling
Documentation/git-update-ref.txt | 28 +++-
builtin/update-ref.c | 255 ++++++++++++++++++++++---------
refs/files-backend.c | 20 +--
strbuf.c | 10 ++
strbuf.h | 6 +
t/t1400-update-ref.sh | 131 ++++++++++++++++
6 files changed, 370 insertions(+), 80 deletions(-)
--
2.26.0
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