From 4a16182d5f9f78e7d817f68a6d28449ce9c32e59 Mon Sep 17 00:00:00 2001 From: "Yann E. MORIN" Date: Sat, 13 Oct 2018 17:05:58 +0200 Subject: [PATCH] package/nodejs: use per-build cache directories When two Buildroot builds run in parallel, and they both happen to call npm at roughly the same time, the two npm instances may conflict when accessing the npm cache, which is by default ~/.npm Although npm is supposed to lock access to the cache, it seems it does sometimes fail to do so properly, bailling out in error, when it would never ever crash at all when not running in parallel. We suspect that the sequence leading to such failures are something like: npm-1 npm-2 lock(retry=few, sleep=short) . does-stuff() . . lock(retry=few, sleep=short) . # can't lock local cache . download-module() . # can't download . exit(1) unlock() As per the docs [0], few = 10, short = 10. So if the first npm (npm-1) takes more than 100s (which can happen behind slow links and/or big modules that contain native code that is compiled), then the second npm (npm-2) will bail out (the download would fail if there is no network access, for example, and only local modules are used). Point npm to use a per-build cache directory, so they no longer compete across builds. That would still need some care when we do top-level parallel builds, though. Note also that the conflicts are not totally eliminated: two or more npm instances may still compete for some other resource that has not yet been identified. But, at least, the conflict window has been drastically shortened now, to the point where it now seldom occurs. Signed-off-by: "Yann E. MORIN" Signed-off-by: Peter Korsgaard --- package/nodejs/nodejs.mk | 1 + 1 file changed, 1 insertion(+) diff --git a/package/nodejs/nodejs.mk b/package/nodejs/nodejs.mk index 29462cb979..429642b795 100644 --- a/package/nodejs/nodejs.mk +++ b/package/nodejs/nodejs.mk @@ -153,6 +153,7 @@ NPM = $(TARGET_CONFIGURE_OPTS) \ npm_config_build_from_source=true \ npm_config_nodedir=$(BUILD_DIR)/nodejs-$(NODEJS_VERSION) \ npm_config_prefix=$(TARGET_DIR)/usr \ + npm_config_cache=$(BUILD_DIR)/.npm-cache \ $(HOST_DIR)/bin/npm # -- 2.30.2