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perf: derive file maps from pinned debs - #269
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Inspect the exact selected Debian archive only when a dependency file map is needed. Avoid downloading and parsing distribution-wide Contents indexes, which third-party apt repositories may not publish and which do not identify the selected package version. Delete the temporary archive after inspection and remove the unused Contents parser.
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Derive dependency file maps from the exact hash-pinned Debian archives
when those maps are needed. Distribution-wide Contents indexes may be
absent from third-party repositories and do not identify the selected
package version.
Remove eager Contents downloads, parsing, and state. Keep file-map
repositories separate from package imports to preserve support for
circular Debian dependency graphs. Use hermetic bsdtar for inspection and
delete the temporary archive afterward.
This trades distribution-wide index work for inspection of the package
archives needed by the build and avoids embedding file lists in generated
module-lock repository specifications.
Depends on #266 and #267. The branch includes those prerequisites; the
file-map change is commit cab5491.