MDEV-29909 : SST fails when table is defined with DATA DIRECTORY='/pa…

[janlindstrom]

…th/to' and datafile is larger than datadir space

std::filesystem is not available in all supported environments. Replaced by using statvfs if available. If not available return error and SST will fail.

[gemini-code-assist]

Code Review

This pull request replaces the use of std::filesystem::space with statvfs to determine the available space on the target filesystem. A review comment points out that f_frsize can be 0 on some systems, which would incorrectly result in available space being calculated as 0 and causing the SST to fail; it suggests falling back to f_bsize in such cases.

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[janlindstrom]

ref: https://buildbot.mariadb.org/#/builders/75/builds/53471/steps/4/logs/stdio

[RazvanLiviuVarzaru]

MDEV-29909 is closed which is a bit misleading given the current bug.
Also happening on SLES-1507 with GCC 7.5 https://buildbot.mariadb.org/#/builders/923/builds/7035/steps/4/logs/stdio

This should be promoted as a Blocker for the upcoming release i.e. compilation failures means no release packages.
fyi @grooverdan , @vuvova

[grooverdan]

Raised MDEV-40512 and #5450 as quick alternate to this.

Its experimental status was around its evolving c++ interface rather than stability.

statvfs isn't fully portable. See plugin/disks/information_schema_disks.cc for what a portable implementation would take. I guess that's why they standardised this.