Hello, there!

pmb/chroot/binfmt.py

@@ -0,0 +1,68 @@
+"""
+Copyright 2017 Oliver Smith
+
+This file is part of pmbootstrap.
+
+pmbootstrap is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+pmbootstrap is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with pmbootstrap.  If not, see <http://www.gnu.org/licenses/>.
+"""
+import os
+import logging
+
+import pmb.helpers.run
+import pmb.parse
+import pmb.parse.arch
+
+
+def is_registered(arch_debian):
+    return os.path.exists("/proc/sys/fs/binfmt_misc/qemu-" + arch_debian)
+
+
+def register(args, arch):
+    """
+    Get arch, magic, mask.
+    """
+    arch_debian = pmb.parse.arch.alpine_to_debian(arch)
+    if is_registered(arch_debian):
+        return
+    pmb.chroot.apk.install(args, ["qemu-user-static-repack",
+                                  "qemu-user-static-repack-binfmt"])
+    info = pmb.parse.binfmt_info(args, arch_debian)
+
+    # Build registration string
+    # https://en.wikipedia.org/wiki/Binfmt_misc
+    # :name:type:offset:magic:mask:interpreter:flags
+    name = "qemu-" + arch_debian
+    type = "M"
+    offset = ""
+    magic = info["magic"]
+    mask = info["mask"]
+    interpreter = "/usr/bin/qemu-" + arch_debian + "-static"
+    flags = "C"
+    code = ":".join(["", name, type, offset, magic, mask, interpreter,
+                     flags])
+
+    # Register in binfmt_misc
+    logging.info("Register qemu binfmt (" + arch_debian + ")")
+    register = "/proc/sys/fs/binfmt_misc/register"
+    pmb.helpers.run.root(
+        args, ["sh", "-c", 'echo "' + code + '" > ' + register])
+
+
+def unregister(args, arch):
+    arch_debian = pmb.parse.arch.alpine_to_debian(arch)
+    binfmt_file = "/proc/sys/fs/binfmt_misc/qemu-" + arch_debian
+    if not os.path.exists(binfmt_file):
+        return
+    logging.info("Unregister qemu binfmt (" + arch_debian + ")")
+    pmb.helpers.run.root(args, ["sh", "-c", "echo -1 > " + binfmt_file])