Read php.ini from the dependency directory in the sessions extension

[ocean90]

Staging fails for any app with a bound Redis or Memcached session service:

Running extension Compile phase
**ERROR** Extension compilation failed: extension sessions compile failed: failed to load PHP config: failed to load php.ini: failed to read config file php/etc/php.ini: open php/etc/php.ini: no such file or directory
Failed to compile droplet: Failed to run all supply scripts: exit status 14

This is the failure reported in #1291.

Cause

NewPHPConfigHelper builds its paths from ctx.BuildDir:

phpIniPath: filepath.Join(ctx.BuildDir, "php", "etc", "php.ini"),

NewContext fills that field from os.Getenv("BUILD_DIR"), which the lifecycle never exports, so it is empty and the helper opens the relative path php/etc/php.ini. createExtensionContext does call ctx.Set("BUILD_DIR", s.Stager.BuildDir()), but Set writes into the Data map and does not reach the struct field. Every other extension reads ctx.GetString("BUILD_DIR") and is unaffected, which is why only the sessions path breaks.

The build directory is also the wrong base. installPHP uses filepath.Join(s.Stager.DepDir(), "php"), and php.ini is written to <deps>/<idx>/php/etc/php.ini. Nothing writes to <build>/php.

Fix

Resolve php.ini and php-fpm.conf from ctx.GetString("DEPS_DIR"), which the supply phase sets to s.Stager.DepDir().

Test

sessions_test.go passed only because it assigned ctx.BuildDir directly, with a comment noting that Set() would not work, and created php/etc under the build directory. That layout does not exist at staging time, so the test could not catch this. It now models the dependency directory. All unit tests pass; src/php/brats fails identically before and after this change, on a DeferCleanup misuse in the vendored bratshelper.

[linux-foundation-easycla]

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• ✅ login: ocean90 / name: Dominik Schilling (2f6aa04)