From: Karthik Nayak <karthik.188@xxxxxxxxx> The 'git-update-ref(1)' command allows transactional reference updates. But currently only supports regular reference updates. Meaning, if one wants to update HEAD (symbolic ref) in a transaction, there is no tool to do so. One option to obtain transactional updates for the HEAD ref is to manually create the HEAD.lock file and commit. This is intrusive, where the user needs to mimic internal git behavior. Also, this only works when using the files backend. At GitLab, we've been using the manual process till date, to allow users to set and change their default branch. But with the introduction of reftables as a reference backend, this becomes a necessity to be solved within git. This patch series goes about introducing 'update-symref' command for 'git-update-ref(1)'. This command allows the user to create symref in a transaction similar to the 'update' command of 'git-update-ref(1)'. This command also works well with the existing 'no-deref' option. We don't create a dedicated 'create-symref' since 'update-symref' can also create symrefs. We don't create 'delete-symref', since the 'delete' command can also delete symrefs. Karthik Nayak (8): files-backend: extract out `create_symref_lock` reftable-backend: extract out `write_symref_with_log` reftable-backend: move `write_symref_with_log` up refs: accept symref in `ref_transaction_add_update` refs/files-backend: add support for symref updates refs/reftable-backend: add support for symref updates refs: add 'update-symref' command to 'update-ref' refs: support symrefs in 'reference-transaction' hook Documentation/git-update-ref.txt | 11 ++- Documentation/githooks.txt | 13 ++- branch.c | 2 +- builtin/fast-import.c | 6 +- builtin/fetch.c | 2 +- builtin/receive-pack.c | 2 +- builtin/replace.c | 2 +- builtin/tag.c | 2 +- builtin/update-ref.c | 63 +++++++++++--- refs.c | 37 ++++++--- refs.h | 9 +- refs/files-backend.c | 95 ++++++++++++++++----- refs/refs-internal.h | 12 ++- refs/reftable-backend.c | 136 ++++++++++++++++++------------- sequencer.c | 6 +- t/t0600-reffiles-backend.sh | 30 +++++++ t/t1400-update-ref.sh | 127 +++++++++++++++++++++++++++++ t/t1416-ref-transaction-hooks.sh | 27 ++++++ walker.c | 2 +- 19 files changed, 464 insertions(+), 120 deletions(-) -- 2.43.GIT
