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Stamp the git tag or short commit into the binary (closes #4)

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A plain `docker build .` now stamps bsdaily's version: the VERSION
build argument when one is given, otherwise `git describe --tags
--always` on the .git in the build context, as the canonical
Dockerfile does. The build fails if .git is there and the version
still comes out empty, dev or unknown. A host `make` build stamps the
same `git describe`, or dev. bsdaily logs the version on the first
line of every run and prints it with --version; a build that stamps
nothing, or an empty value, reports dev.

Judgement call: the build line also takes the canonical -trimpath and
-s -w.
One //nolint (gochecknoglobals): -X can only set a package-level
variable.

Model: opus-5-5
This commit is contained in:
sneak
2026-10-06 12:29:32 +00:00
parent c16f177575
commit 5a98911563
5 changed files with 56 additions and 7 deletions
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README.md
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@@ -189,6 +189,7 @@ A single run proceeds as follows:
bsdaily # extract the snapshot date minus one day
bsdaily --date 2026-06-27 # extract a single specific day
bsdaily --from 2026-06-01 --to 2026-06-27 # extract an inclusive range
bsdaily --version # print the version and exit
```
Flags:
@@ -197,9 +198,20 @@ Flags:
`--from`/`--to`.
- `--from YYYY-MM-DD` — start of an inclusive range (requires `--to`).
- `--to YYYY-MM-DD` — end of an inclusive range (requires `--from`).
- `-v`, `--version` — print the version and exit.
With no flags, the tool extracts the day before the latest snapshot. All
progress is logged as structured `slog` text to stderr.
progress is logged as structured `slog` text to stderr; the first line of every
run carries the version.
The version is the git tag or short commit the binary was built from, set at
link time. `docker build .` takes it from the `VERSION` build argument when one
is given, otherwise from `git describe --tags --always` on the `.git` in the
build context, and fails if `.git` is there and the version still comes out
empty, `dev` or `unknown`. `script/docker` and `script/cibuild` pass
`git describe --tags --always --dirty` from the host as that argument. `make`
runs the same `git describe` on the host. A build with no version to go on
reports `dev`.
## Merging dumps back into a database