Fix Linux host config

Author: arrdem

uv/private/host/repository.bzl

@@ -29,15 +29,30 @@ def _platform(rctx):
 
     elif os == "linux":
         res = rctx.execute(["ldd", "--version"])
+        if res.return_code != 0:
+            fail("Unable to determine host libc!")
 
-        libc = "musllinux" if "musl" in res.stdout else "manylinux"
-        if libc == "musllinux":
+        out = res.stdout.lower()
+
+        # - Alpine: "musl libc\nversion <ver>\n ..."
+        if "musl" in out:
             ver = res.stdout.split("\n")[1].split(" ")[-1].split(".")
-            return libc, "{}.{}".format(ver[0], ver[1])
+            return "musl", "{}.{}".format(ver[0], ver[1])
+
+        # - Amazon Linux: "ldd (gnu libc ...) <ver>\n..."
+        # - Arch Linux: "ldd (gnu libc ...) <ver>\n..."
+        # - Debian: "ldd (debian glibc ...) <ver>\n..."
+        # - Fedora: "ldd (gnu libc ...) <ver>\n..."
+        # - Oracle Linux: "ldd (gnu libc ...) <ver>\n..."
+        # - Ubuntu: "ldd (ubuntu glibc ...) <ver>\n..."
+        elif "glibc" in out or "gnu libc" in out:
+            ver = res.stdout.split("\n")[0].split(")")[1].strip().split(".")
+            major = ver[0]
+            minor = ver[1]
+            return "glibc", "{}.{}".format(major, minor)
 
-        elif libc == "manylinux":
-            ver = res.stdout.split("\n")[0].split(" ")[-1].split(".")
-            return libc, "{}.{}".format(ver[0], ver[1])
+        else:
+            fail("Unknown libc from ldd --version %r" % res.stdout)
 
     # TODO: Windows
     # TODO: Other