[PATCH 0/2] replay: add --update-refs option

This patch series adds a --update-refs option to git replay. Right now, when you use git replay, you need to pipe its output to git update-ref like this:

    git replay --onto main topic1..topic2 | git update-ref --stdin

This works fine, but it means running two commands and doesn't give you atomic transactions by default. The new --update-refs option lets you do the ref updates directly:

    git replay --update-refs --onto main topic1..topic2

I discussed this feature with Christian Couder earlier, and we agreed that it would be useful for server-side operations where you want atomic updates.

The way it works:
- By default, it uses atomic transactions (all refs get updated or none do)
- There's a --batch option if you want some updates to succeed even if 
  others fail
- It works with bare repositories, which is important for server operations
  like Gitaly
- When it succeeds, it doesn't print anything (just like git update-ref 
  --stdin)
- You can't use --update-refs with the existing --update option

This should help with git replay's goal of being good for server-side operations. It also makes the command simpler to use since you don't need the pipeline anymore, and the atomic behavior is better for reliability.

Siddharth Asthana (2):
  replay: add --update-refs option for atomic ref updates
  replay: document --update-refs and --batch options

 Documentation/git-replay.adoc |  62 ++++++-
 builtin/replay.c              | 134 +++++++++++++-
 t/meson.build                 |   1 +
 t/t3650-replay-basics.sh      | 323 ++++++++++++++++++++++++++++++++++
 t/t3651-replay-update-refs.sh | 273 ++++++++++++++++++++++++++++
 5 files changed, 778 insertions(+), 15 deletions(-)
 create mode 100755 t/t3651-replay-update-refs.sh