Re: pg_upgrade version checking questions

> On 27 Jul 2019, at 08:42, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> wrote:

> I have committed 0002, 0003, and 0004.

Thanks!

> The implementation in 0001 (Only allow upgrades by the same exact
> version new bindir) has a problem. It compares (new_cluster.bin_version
> != PG_VERSION_NUM), but new_cluster.bin_version is actually just the
> version of pg_ctl, so this is just comparing the version of pg_upgrade
> with the version of pg_ctl, which is not wrong, but doesn't really
> achieve the full goal of having all binaries match.

Right, it seemed the cleanest option at the time more or less based on the
issues outlined below.

> I think a better structure would be to add a version check for each
> validate_exec() so that each program is checked against pg_upgrade.
> This should mirror what find_other_exec() in src/common/exec.c does. In
> a better world we would use find_other_exec() directly, but then we
> can't support -B. Maybe expand find_other_exec() to support this, or
> make a private copy for pg_upgrade to support this. (Also, we have two
> copies of validate_exec() around. Maybe this could all be unified.)

I’ll take a stab at tidying all of this up to require less duplication, we’ll
see where that ends up.

cheers ./daniel