forked from Mirror/pmbootstrap
f49da75998
We require binfmt_misc to run programs of foreign architectures (e.g. armhf) with QEMU. This is set up by default in most distributions, but in some (e.g. Alpine, Void) it needs to be configured manually (see the troubleshooting page in the wiki). We have a check in place, which points to that troubleshooting wiki page. However, the check was flawed, because we assumed the binfmt_misc folder would not exist. Thanks to @fxkrait for making the fix and for testing it!
176 lines
6.6 KiB
Python
176 lines
6.6 KiB
Python
"""
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Copyright 2018 Oliver Smith
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This file is part of pmbootstrap.
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pmbootstrap is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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pmbootstrap is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with pmbootstrap. If not, see <http://www.gnu.org/licenses/>.
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"""
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import logging
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import os
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import re
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import pmb.chroot
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import pmb.config
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import pmb.helpers.run
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def folder_size(args, path):
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"""
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Run `du` to calculate the size of a folder (this is less code and
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faster than doing the same task in pure Python). This result is only
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approximatelly right, but good enough for pmbootstrap's use case:
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<https://github.com/postmarketOS/pmbootstrap/pull/760>
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:returns: folder size in bytes
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"""
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output = pmb.helpers.run.root(args, ["du", "--summarize",
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"--apparent-size",
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"--block-size=1",
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path], return_stdout=True)
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ret = int(output.split("\t")[0])
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return ret
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def check_grsec(args):
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"""
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Check if the current kernel is based on the grsec patchset, and if
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the chroot_deny_chmod option is enabled. Raise an exception in that
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case, with a link to the issue. Otherwise, do nothing.
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"""
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path = "/proc/sys/kernel/grsecurity/chroot_deny_chmod"
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if not os.path.exists(path):
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return
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link = "https://github.com/postmarketOS/pmbootstrap/issues/107"
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raise RuntimeError("You're running a kernel based on the grsec"
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" patchset. At the moment, pmbootstrap is not"
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" compatible with grsec or a hardened kernel, sorry!"
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" To get pmbootstrap working, you will need to switch"
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" to a vanilla kernel (i.e. non-hardened and without grsec)."
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" Alternatively, it would be awesome if you want to add"
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" support for hardened/grsec kernels, please see this for"
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" more details: <" + link + ">")
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def check_binfmt_misc(args):
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"""
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Check if the 'binfmt_misc' module is loaded by checking, if
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/proc/sys/fs/binfmt_misc/ exists. If it exists, then do nothing.
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Otherwise, raise an exception pointing to user to the Wiki.
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"""
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path = "/proc/sys/fs/binfmt_misc/status"
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if os.path.exists(path):
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return
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link = "https://postmarketos.org/binfmt_misc"
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raise RuntimeError("It appears that your system has not loaded the"
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" module 'binfmt_misc'. This is required to run"
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" foreign architecture programs with QEMU (eg."
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" armhf on x86_64):\n See: <" + link + ">")
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def migrate_success(args, version):
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logging.info("Migration to version " + str(version) + " done")
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with open(args.work + "/version", "w") as handle:
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handle.write(str(version) + "\n")
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def migrate_work_folder(args):
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# Read current version
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current = 0
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path = args.work + "/version"
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if os.path.exists(path):
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with open(path, "r") as f:
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current = int(f.read().rstrip())
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# Compare version, print warning or do nothing
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required = pmb.config.work_version
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if current == required:
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return
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logging.info("WARNING: Your work folder version needs to be migrated"
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" (from version " + str(current) + " to " + str(required) +
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")!")
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# 0 => 1
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if current == 0:
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# Ask for confirmation
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logging.info("Changelog:")
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logging.info("* Building chroots have a different username: "
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"<https://github.com/postmarketOS/pmbootstrap/issues/709>")
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logging.info("Migration will do the following:")
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logging.info("* Zap your chroots")
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logging.info("* Adjust '" + args.work + "/config_abuild/abuild.conf'")
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if not pmb.helpers.cli.confirm(args):
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raise RuntimeError("Aborted.")
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# Zap and update abuild.conf
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pmb.chroot.zap(args, False)
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conf = args.work + "/config_abuild/abuild.conf"
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if os.path.exists(conf):
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pmb.helpers.run.root(args, ["sed", "-i",
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"s./home/user/./home/pmos/.g", conf])
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# Update version file
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migrate_success(args, 1)
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current = 1
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# 1 => 2
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if current == 1:
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# Ask for confirmation
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logging.info("Changelog:")
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logging.info("* Fix: cache_distfiles was writable for everyone")
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logging.info("Migration will do the following:")
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logging.info("* Fix permissions of '" + args.work +
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"/cache_distfiles'")
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if not pmb.helpers.cli.confirm(args):
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raise RuntimeError("Aborted.")
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# Fix permissions
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dir = "/var/cache/distfiles"
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for cmd in [["chown", "-R", "root:abuild", dir],
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["chmod", "-R", "664", dir],
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["chmod", "a+X", dir]]:
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pmb.chroot.root(args, cmd)
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migrate_success(args, 2)
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current = 2
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# Can't migrate, user must delete it
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if current != required:
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raise RuntimeError("Sorry, we can't migrate that automatically. Please"
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" run 'pmbootstrap shutdown', then delete your"
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" current work folder manually ('sudo rm -rf " +
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args.work + "') and start over with 'pmbootstrap"
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" init'. All your binary packages and caches will"
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" be lost.")
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def validate_hostname(hostname):
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"""
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Check whether the string is a valid hostname, according to
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<http://en.wikipedia.org/wiki/Hostname#Restrictions_on_valid_host_names>
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"""
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# Check length
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if len(hostname) > 63:
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logging.fatal("ERROR: Hostname '" + hostname + "' is too long.")
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return False
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# Check that it only contains valid chars
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if not re.match("^[0-9a-z-]*$", hostname):
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logging.fatal("ERROR: Hostname must only contain letters (a-z),"
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" digits (0-9) or minus signs (-)")
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return False
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# Check that doesn't begin or end with a minus sign
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if hostname[:1] == "-" or hostname[-1:] == "-":
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logging.fatal("ERROR: Hostname must not begin or end with a minus sign")
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return False
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return True
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