Run #4274 made progress: identical ISO sizes, identical TOC, identical
first 8 KiB — divergence is fully in file payload bytes. But the
diagnostic stalled because extract_squashfs() couldn't find the rootfs:
diagnose: could not extract squashfs from A
diagnose: could not extract squashfs from B
Two reasons to address:
1. The named-path probes only checked /live/filesystem.squashfs,
/casper/filesystem.squashfs and /filesystem.squashfs. Some live-build
configs use /install/... or no canonical name at all.
2. The fallback that used `xorriso -find / -name '*.squashfs'` then
piped to `xorriso -extract` didn't work because xorriso's -find
output quotes paths, and -extract chokes on quotes.
This iteration:
* Adds /install/filesystem.squashfs and /boot/filesystem.squashfs
to the named-path probes.
* Replaces the -find/-name/tail fallback with a generic "biggest
file in the ISO" picker. In a live-build ISO the rootfs payload
is reliably the largest file regardless of what it's called.
Parses lsdl output (with awk, handling spaces in paths and
stripping single-quote framing).
* On extraction failure, dumps the top 20 files by size to stderr
so the workflow log shows what's actually in the ISO — answers
"what should the named-path probe match" for the next iter.
* Always echoes the first 30 lines of toc-a.txt (and the line
count) so we can sanity-check the ISO layout in every run.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
SysAdmin
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