Commit 833f5cff authored by Sebastien Luttringer's avatar Sebastien Luttringer
Browse files

add chroot command 

this command is and helper to chroot inside payload mounting /{proc,sys,dev,dev/pts} fs
inside the chroot and disable daemon restart
parent a996f3bf

bin/is

+15 −0
Original line number Diff line number Diff line
@@ -117,6 +117,12 @@ def c_check(parser, args): 
    for reponame in args.repository:

        repoman[reponame].check()



def c_chroot(parser, args):

    '''

    Helper to go cleanly inside a chroot

    '''

    istools.chroot(args.path, shell=args.shell, mount=not args.no_mount)



def c_clean(parser, args):

    '''

    Remove unreferenced files from repoistory
@@ -366,6 +372,15 @@ p_check = subparsers.add_parser("check", help=c_check.__doc__.lower()) 
p_check.add_argument("repository", nargs="+", help="repositories to check")

p_check.set_defaults(func=c_check)



# chroot command parser

p_chroot = subparsers.add_parser("chroot", help=c_chroot.__doc__.lower())

p_chroot.add_argument("-m", "--no-mount", action="store_true", default=False,

                      help="disable mouting of /{proc,dev,sys} inside chroot")

p_chroot.add_argument("-s", "--shell", default="/bin/bash",

                      help="shell to call inside chroot")

p_chroot.add_argument("path")

p_chroot.set_defaults(func=c_chroot)



# clean command parser

p_clean = subparsers.add_parser("clean", help=c_clean.__doc__.lower())

p_clean.add_argument("repository", nargs="+", help="repositories to clean")

installsystems/tools.py

+54 −0
Original line number Diff line number Diff line
@@ -13,6 +13,8 @@ import shutil 
import urllib2

import time



from subprocess import call, check_call, CalledProcessError



from installsystems.progressbar import ProgressBar, Percentage, FileTransferSpeed

from installsystems.progressbar import Bar, BouncingBar, ETA, UnknownLength

from installsystems.tarball import Tarball
@@ -327,3 +329,55 @@ def human_size(num): 
            return "%3.1f%s" % (num, x)

        num /= 1024.0

    return "%3.1f%s" % (num, x)



def chroot(path, shell="/bin/bash", mount=True):

    '''

    Chroot inside a directory and call shell

    if mount is true, mount /{proc,dev,sys} inside the chroot

    '''

    # try to guest distro

    if os.path.exists(os.path.join(path, "etc/debian_version")):

        distro="debian"

    elif os.path.exists(os.path.join(path, "etc/arch-release")):

        distro="archlinux"

    else:

        distro=None

    # try to mount /proc /sys /dev

    if mount:

        mps = ("proc", "sys", "dev", "dev/pts")

        arrow("Mouting filesystems")

        for mp in mps:

            origin =  "/%s" % mp

            target = os.path.join(path, mp)

            if os.path.ismount(origin) and os.path.isdir(target):

                arrow("%s -> %s" % (origin, target), 1)

                try:

                    check_call(["mount",  "--bind", origin, target], close_fds=True)

                except CalledProcessError as e:

                    warn("Mount failed: %s.\n" % e)

    # in case of debian disable policy

    if distro == "debian":

        arrow("Creating debian chroot housekeepers")

        # create a chroot header

        try: open(os.path.join(path, "etc/debian_chroot"), "w").write("CHROOT")

        except: pass

        # fake policy-d

        try: open(os.path.join(path, "usr/sbin/policy-rc.d"), "w").write("#!/bin/bash\nexit 42\n")

        except: pass

    # chrooting

    arrow("Chrooting inside %s and running %s" % (path, shell))

    call(["chroot", path, shell], close_fds=True)

    # cleaning debian stuff

    if distro == "debian":

        arrow("Removing debian chroot housekeepers")

        for f in ("etc/debian_chroot", "usr/sbin/policy-rc.d"):

            try: os.unlink(os.path.join(path, f))

            except: pass

    # unmounting

    if mount:

        arrow("Unmouting filesystems")

        for mp in reversed(mps):

            target = os.path.join(path, mp)

            if os.path.ismount(target):

                arrow(target, 1)

                call(["umount", target], close_fds=True)