From 476448b9d4b3e29afe7ae6cd3418cb561055e563 Mon Sep 17 00:00:00 2001
From: Sebastian <sebastian@silef.de>
Date: Mon, 10 May 2021 10:55:20 +0200
Subject: [PATCH] Install: allow cross-libc via sharp-install-force flag
 (#2692)

---
 docs/install.md    |  2 ++
 install/libvips.js | 15 ++++++++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/docs/install.md b/docs/install.md
index cdb4de80..aa39fa0b 100644
--- a/docs/install.md
+++ b/docs/install.md
@@ -54,6 +54,8 @@ When using npm v6 or earlier, the `npm install --unsafe-perm` flag must be used
 
 When using npm v7, the user running `npm install` must own the directory it is run in.
 
+When installing cross platform prebuilts on linux hosts an installation can be forced by `--sharp-install-force` flag or by setting `SHARP_INSTALL_FORCE` env variable.
+
 The `npm install --ignore-scripts=false` flag must be used when `npm` has been configured to ignore installation scripts.
 
 Check the output of running `npm install --verbose sharp` for useful error messages.
diff --git a/install/libvips.js b/install/libvips.js
index a2d1b5e5..78d8b6ff 100644
--- a/install/libvips.js
+++ b/install/libvips.js
@@ -36,6 +36,7 @@ const { minimumLibvipsVersion, minimumLibvipsVersionLabelled } = libvips;
 const distHost = process.env.npm_config_sharp_libvips_binary_host || 'https://github.com/lovell/sharp-libvips/releases/download';
 const distBaseUrl = process.env.npm_config_sharp_dist_base_url || process.env.SHARP_DIST_BASE_URL || `${distHost}/v${minimumLibvipsVersionLabelled}/`;
 const supportsBrotli = ('BrotliDecompress' in zlib);
+const installationForced = !!(process.env.npm_config_sharp_install_force || process.env.SHARP_INSTALL_FORCE);
 
 const fail = function (err) {
   libvips.log(err);
@@ -47,6 +48,14 @@ const fail = function (err) {
   process.exit(1);
 };
 
+const handleError = function (err) {
+  if (installationForced) {
+    console.warn(`${err.message}. Continue due forced installation`);
+  } else {
+    throw err;
+  }
+};
+
 const extractTarball = function (tarPath, platformAndArch) {
   const vendorPath = path.join(__dirname, '..', 'vendor');
   libvips.mkdirSync(vendorPath);
@@ -98,18 +107,18 @@ try {
     }
     if (detectLibc.family === detectLibc.GLIBC && detectLibc.version) {
       if (semverLessThan(`${detectLibc.version}.0`, `${minimumGlibcVersionByArch[arch]}.0`)) {
-        throw new Error(`Use with glibc ${detectLibc.version} requires manual installation of libvips >= ${minimumLibvipsVersion}`);
+        handleError(new Error(`Use with glibc ${detectLibc.version} requires manual installation of libvips >= ${minimumLibvipsVersion}`));
       }
     }
     if (detectLibc.family === detectLibc.MUSL && detectLibc.version) {
       if (semverLessThan(detectLibc.version, '1.1.24')) {
-        throw new Error(`Use with musl ${detectLibc.version} requires manual installation of libvips >= ${minimumLibvipsVersion}`);
+        handleError(new Error(`Use with musl ${detectLibc.version} requires manual installation of libvips >= ${minimumLibvipsVersion}`));
       }
     }
 
     const supportedNodeVersion = process.env.npm_package_engines_node || require('../package.json').engines.node;
     if (!semverSatisfies(process.versions.node, supportedNodeVersion)) {
-      throw new Error(`Expected Node.js version ${supportedNodeVersion} but found ${process.versions.node}`);
+      handleError(new Error(`Expected Node.js version ${supportedNodeVersion} but found ${process.versions.node}`));
     }
 
     const extension = supportsBrotli ? 'br' : 'gz';