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update: hand over cleanly from updates older than 2026-10-19

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013acac's update (in use 2026-08-14 to 2026-10-19) copies the new update
over itself with sudo cp while bash is still reading it, so bash reads on
from byte 1484 of the new file: today, the middle of the logo, and the
update dies with a syntax error. Put a line at exactly that byte that
execs the new update, in a here-document a normal run skips. Found by
30-upgrade-from-baseline at ca658dc; the test replays 013acac's update.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
david
2026-11-06 14:00:59 -07:00
co-authored by Claude Opus 5.5
parent a72835e866
commit b2a16471fd
2 changed files with 41 additions and 0 deletions
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update
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@@ -1,5 +1,29 @@
#!/bin/bash
# Updates from before 2026-10-19 (013acac's) copy this file over themselves
# while bash is still reading them, then read on from byte 1484 of the new copy.
# The exec line below starts at exactly that byte, so they run this update
# afresh; the rest of the block pads it into place, and in a normal run the
# block is a here-document nothing reads. Keep the exec line at byte 1484:
# tests/update.bats checks it.
: << 'FROM_OLD_UPDATE'
This block is padding for old updates. This block is padding for old updates.
This block is padding for old updates. This block is padding for old updates.
This block is padding for old updates. This block is padding for old updates.
This block is padding for old updates. This block is padding for old updates.
This block is padding for old updates. This block is padding for old updates.
This block is padding for old updates. This block is padding for old updates.
This block is padding for old updates. This block is padding for old updates.
This block is padding for old updates. This block is padding for old updates.
This block is padding for old updates. This block is padding for old updates.
This block is padding for old updates. This block is padding for old updates.
This block is padding for old updates. This block is padding for old updates.
This block is padding for old updates. This block is padding for old updates.
This block is padding for old updates. This block is padding for old updates.
...................
exec ~/.local/bin/update
FROM_OLD_UPDATE
# The whole script is wrapped in { ...; exit; } so bash parses all of it before
# running anything. That way, replacing this file mid-run (e.g. by git pull and
# the copy below) can't make the running copy read a mix of old and new text.