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bb62213e84
* fix: install linux sysroot in configure, not via gclient hook `gn gen` was failing on the arm64 leg with `Missing sysroot (//build/linux/debian_bullseye_arm64-sysroot)`. The previous design relied on `git_setup` writing `target_cpus` to `.gclient` so that `gclient sync`'s DEPS hook would download the cross-arch sysroot. That chain breaks for any chromium_src that was synced before cross-arch support landed (the hook is gated on .gclient state at sync time) and for partial pipeline runs that skip git_setup entirely. Nothing in configure declared or verified its sysroot precondition. Make configure self-healing: on Linux, invoke `build/linux/sysroot_scripts/install-sysroot.py --arch=<target>` directly before `gn gen`. install-sysroot.py is idempotent (stamp file + SHA check), fast when already installed, and decoupled from .gclient — it's exactly what the failing assertion's error message recommends. The script accepts our arch names directly: `x64` translates to `amd64` internally via ARCH_TRANSLATIONS, and `arm64` is a valid pass-through. Also temporarily pin release.linux.yaml to x64 only while we validate the sysroot bootstrap end-to-end. Flip back to `[x64, arm64]` once arm64 is green. * chore: pin release.linux.yaml to arm64-only for sysroot bootstrap test x64 already builds cleanly — the failing leg is arm64 cross-compile from an x64 host. Pin the config to arm64 to exercise the new install-sysroot.py path in configure without burning time on x64. Flip back to [x64, arm64] once arm64 is green.