feat: allow checkPlatform to override execution libc (#71)

- Part of #65

README.md

@@ -25,6 +25,6 @@ Check if a package's `os`, `cpu` and `libc` match the running system.
 
 `force` argument skips all checks.
 
-`environment` overrides the execution environment which comes from `process.platform` and `process.arch` by default. `environment.os` and `environment.cpu` are available.
+`environment` overrides the execution environment which comes from `process.platform` `process.arch` and current `libc` environment by default. `environment.os` `environment.cpu` and `environment.libc` are available.
 
 Error code: 'EBADPLATFORM'

lib/index.js

@@ -36,7 +36,9 @@ const checkPlatform = (target, force = false, environment = {}) => {
   let libcFamily = null
   if (target.libc) {
     // libc checks only work in linux, any value is a failure if we aren't
-    if (platform !== 'linux') {
+    if (environment.libc) {
+      libcOk = checkList(environment.libc, target.libc)
+    } else if (platform !== 'linux') {
       libcOk = false
     } else {
       const report = process.report.getReport()

test/check-platform.js

@@ -59,6 +59,15 @@ t.test('nothing wrong with overridden cpu', async t =>
     cpu: 'enten-cpu',
   }))
 
+t.test('nothing wrong with overridden libc', async t =>
+  checkPlatform({
+    cpu: 'enten-cpu',
+    libc: 'enten-libc',
+  }, false, {
+    cpu: 'enten-cpu',
+    libc: 'enten-libc',
+  }))
+
 t.test('wrong os with overridden os', async t =>
   t.throws(() => checkPlatform({
     cpu: 'any',
@@ -75,6 +84,15 @@ t.test('wrong cpu with overridden cpu', async t =>
     cpu: 'another-cpu',
   }), { code: 'EBADPLATFORM' }))
 
+t.test('wrong libc with overridden libc', async t =>
+  t.throws(() => checkPlatform({
+    cpu: 'enten-cpu',
+    os: 'any',
+    libc: 'enten-libc',
+  }, false, {
+    libc: 'another-libc',
+  }), { code: 'EBADPLATFORM' }))
+
 t.test('libc', (t) => {
   let PLATFORM = ''