81 lines
3.1 KiB
Markdown
81 lines
3.1 KiB
Markdown
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Let's see what happens if we try to push a head which diverges from the
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canonical head.
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First we add a second delegate, Bob, to our repo:
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``` ~alice
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$ rad id update --title "Add Bob" --description "" --delegate did:key:z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk --repo rad:z42hL2jL4XNk6K8oHQaSWfMgCL7ji -q
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c036c0d89ce26aef3ad7da402157dba16b5163b4
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```
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Then, as Bob, we commit some code on top of the canonical head:
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``` ~bob
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$ rad sync --fetch
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✓ Fetching rad:z42hL2jL4XNk6K8oHQaSWfMgCL7ji from z6MknSL…StBU8Vi@[..]..
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✓ Fetched repository from 1 seed(s)
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$ rad inspect --delegates
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did:key:z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi (alice)
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did:key:z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk (bob)
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$ git commit -m "Third commit" --allow-empty -q
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$ git push rad
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$ git branch -arv
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alice@z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi/master f2de534 Second commit
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rad/master 319a7dc Third commit
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```
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As Alice, we fetch that code, but commit on top of our own master, which is no
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longer canonical, since Bob pushed a more recent commit, and the threshold is 1:
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``` ~alice
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$ rad remote add did:key:z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk --fetch --no-sync
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✓ Remote bob@z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk added
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✓ Remote-tracking branch bob@z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk/master created for z6Mkt67…v4N1tRk
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$ git branch -arv
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bob@z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk/master 319a7dc Third commit
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rad/master f2de534 Second commit
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$ git commit -m "Third commit by Alice" --allow-empty -q
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```
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If we try to push now, we get an error with a hint, telling us that we need to
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integrate Bob's changes before pushing ours:
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``` ~alice (stderr) (fail) RAD_HINT=1
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$ git push rad
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hint: you are attempting to push a commit that would cause your upstream to diverge from the canonical head
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hint: to integrate the remote changes, run `git pull --rebase` and try again
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error: refusing to update branch to commit that is not a descendant of canonical head
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error: failed to push some refs to 'rad://z42hL2jL4XNk6K8oHQaSWfMgCL7ji/z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi'
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```
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We do that, and notice that we're now able to push our code:
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``` ~alice
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$ git pull --rebase
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$ git log --oneline
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f6cff86 Third commit by Alice
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319a7dc Third commit
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f2de534 Second commit
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08c788d Initial commit
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```
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``` ~alice RAD_SOCKET=/dev/null (stderr)
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$ git push rad
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✓ Canonical head updated to f6cff86594495e9beccfeda7c20173e55c1dd9fc
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To rad://z42hL2jL4XNk6K8oHQaSWfMgCL7ji/z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi
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f2de534..f6cff86 master -> master
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```
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One thing of note is that we can revert to an older commit as long as we are
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still ahead of the other delegates.
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``` ~alice
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$ git reset --hard HEAD^ -q
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```
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``` ~alice RAD_SOCKET=/dev/null (stderr)
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$ git push -f
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✓ Canonical head updated to 319a7dc3b195368ded4b099f8c90bbb80addccd3
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To rad://z42hL2jL4XNk6K8oHQaSWfMgCL7ji/z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi
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+ f6cff86...319a7dc master -> master (forced update)
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```
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