Vinícius Ferrão 6da5efd29a fix(mknb): build the genesis image atomically to survive concurrent runs ...

mknb writes the compressed genesis filesystem by streaming cpio output
straight onto the final path in $tftpdir/xcat (genesis.fs.$arch.lzma or .gz).
When two mknb/nodeset runs target a shared $tftpdir at once, one run reads or
overwrites the other's half-written image, producing a corrupt genesis.fs and
failed netboots.

Write each image to a uniquely-suffixed temporary file
(xCAT::Utils::genpassword(24)) and File::Copy::move() it into place. move()
within the same directory is a rename, so the final path only ever appears
complete. Both modules are already imported by mknb.pm.

Recovered from the unmerged lenovobuild branch (originals c651e7b8 and its
fix da0723f2, which switched the suffix to genpassword after the first
attempt only produced a single character). master lacks the branch's xz
path, so only the lzma and gzip paths are adjusted here.

Co-authored-by: Jarrod Johnson <10814490+jjohnson42@users.noreply.github.com>

2026-07-21 16:24:08 -03:00

..

perl/xCAT

Merge pull request #7588 from VersatusHPC/fix/issue-6495-nfs-root-options

2026-07-17 23:46:14 -03:00

xcat

fix(mknb): build the genesis image atomically to survive concurrent runs

2026-07-21 16:24:08 -03:00