tree a659cb254f9d499306e632c22d8a70e7c81b40ff
parent 0e6f876eecf17830b8dd9f1db008aaf3a239966e
author msta <msta@google.com> 1783567588 +1000
committer gn-scoped@luci-project-accounts.iam.gserviceaccount.com <gn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1783571024 -0700

Fix command_format_unittest.cc out-of-tree builds.

The format unittests were relying on the source root being exactly one
directory level up from the executable directory. This assumption fails
when building with a custom or nested output directory, such as
out/Default, or when building out-of-tree (like in /tmp/gn-release).

To resolve this robustly:
1. build/gen.py now writes the absolute path of the repository root
   (REPO_ROOT) to source_root.txt in the build directory.
2. GetFormatTestDataDir() in src/gn/command_format_unittest.cc reads
   source_root.txt to dynamically resolve the repository root and sets
   the CWD to that location. If the file cannot be read, it fails
   immediately via CHECK.

Bug: None
Change-Id: I93d9a1642720ce912fd767e76eb414016a6a6964
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/23944
Reviewed-by: Takuto Ikuta <tikuta@google.com>
Commit-Queue: Matt Stark <msta@google.com>