From 833f5cffddd5d1d0acae38d25f55326f922b9a37 Mon Sep 17 00:00:00 2001
From: Sebastien Luttringer <sebastien.luttringer@smartjog.com>
Date: Fri, 21 Oct 2011 15:56:50 +0200
Subject: [PATCH] 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
---
bin/is | 15 ++++++++++++
installsystems/tools.py | 54 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 69 insertions(+)
diff --git a/bin/is b/bin/is
index 3f08269..f84e399 100755
--- a/bin/is
+++ b/bin/is
@@ -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")
diff --git a/installsystems/tools.py b/installsystems/tools.py
index 6ccf791..826bae6 100644
--- a/installsystems/tools.py
+++ b/installsystems/tools.py
@@ -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)
--
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