nixpkgs/system/activate-configuration.sh
Eelco Dolstra 49e8829053 * Use unionfs to provide a real Live CD, i.e., the files on the CD
appear writable (though all writes go to a tmpfs).  This allows you
  to run Nix operations on the Live CD.  However, we're not quite
  there yet since the CD doesn't have a valid Nix database.  So for
  instance a garbage collect will cause everything to be deleted,
  hanging the system.

svn path=/nixos/trunk/; revision=10276
2008-01-24 16:56:09 +00:00

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#! @shell@
systemConfig="$1"
if test -z "$systemConfig"; then
systemConfig="/system" # for the installation CD
fi
export PATH=/empty
for i in @path@; do PATH=$PATH:$i/bin:$i/sbin; done
# Needed by some programs.
ln -sfn /proc/self/fd /dev/fd
ln -sfn /proc/self/fd/0 /dev/stdin
ln -sfn /proc/self/fd/1 /dev/stdout
ln -sfn /proc/self/fd/2 /dev/stderr
# Set up the statically computed bits of /etc.
staticEtc=/etc/static
rm -f $staticEtc
ln -s @etc@/etc $staticEtc
for i in $(cd $staticEtc && find * -type l); do
mkdir -p /etc/$(dirname $i)
rm -f /etc/$i
if test -e "$staticEtc/$i.mode"; then
# Create a regular file in /etc.
cp $staticEtc/$i /etc/$i
chown root.root /etc/$i
chmod "$(cat "$staticEtc/$i.mode")" /etc/$i
else
# Create a symlink in /etc.
ln -s $staticEtc/$i /etc/$i
fi
done
# Remove dangling symlinks that point to /etc/static. These are
# configuration files that existed in a previous configuration but not
# in the current one.
for i in $(find /etc/ -type l); do
target=$(readlink "$i")
if test "${target:0:${#staticEtc}}" = "$staticEtc" -a ! -e "$i"; then
rm -f "$i"
fi
done
# Create the required /bin/sh symlink; otherwise lots of things
# (notably the system() function) won't work.
mkdir -m 0755 -p $mountPoint/bin
ln -sfn @bash@/bin/sh $mountPoint/bin/sh
# Allow the kernel to find our wrapped modprobe (which searches in the
# right location in the Nix store for kernel modules). We need this
# when the kernel (or some module) auto-loads a module.
# !!! maybe this should only happen at boot time, since we shouldn't
# use modules that don't match the running kernel.
echo @modprobe@/sbin/modprobe > /proc/sys/kernel/modprobe
# Various log/runtime directories.
mkdir -m 0755 -p /var/run
mkdir -m 0755 -p /var/run/console # for pam_console
touch /var/run/utmp # must exist
chmod 644 /var/run/utmp
mkdir -m 0755 -p /var/run/nix/current-load # for distributed builds
mkdir -m 0755 -p /var/log
touch /var/log/wtmp # must exist
chmod 644 /var/log/wtmp
touch /var/log/lastlog
chmod 644 /var/log/lastlog
mkdir -m 1777 -p /var/tmp
# Empty, read-only home directory of many system accounts.
mkdir -m 0555 -p /var/empty
# If there is no password file yet, create a root account with an
# empty password.
if ! test -e /etc/passwd; then
rootHome=/root
touch /etc/passwd; chmod 0644 /etc/passwd
touch /etc/group; chmod 0644 /etc/group
touch /etc/shadow; chmod 0600 /etc/shadow
# Can't use useradd, since it complains that it doesn't know us
# (bootstrap problem!).
echo "root:x:0:0:System administrator:$rootHome:@defaultShell@" >> /etc/passwd
echo "root::::::::" >> /etc/shadow
echo | passwd --stdin root
fi
# Create system users and groups.
@shell@ @createUsersGroups@ @usersList@ @groupsList@
# Set up Nix.
mkdir -p /nix/etc/nix
ln -sfn /etc/nix.conf /nix/etc/nix/nix.conf
chown root.nixbld /nix/store
chmod 1775 /nix/store
# Nix initialisation.
mkdir -m 0755 -p \
/nix/var/nix/gcroots \
/nix/var/nix/temproots \
/nix/var/nix/manifests \
/nix/var/nix/userpool \
/nix/var/nix/profiles \
/nix/var/nix/db \
/nix/var/log/nix/drvs \
/nix/var/nix/channel-cache
mkdir -m 1777 -p /nix/var/nix/gcroots/per-user
mkdir -m 1777 -p /nix/var/nix/profiles/per-user
ln -sf /nix/var/nix/profiles /nix/var/nix/gcroots/
ln -sf /nix/var/nix/manifests /nix/var/nix/gcroots/
# Make a few setuid programs work.
PATH=@systemPath@/bin:@systemPath@/sbin:$PATH
wrapperDir=@wrapperDir@
if test -d $wrapperDir; then rm -f $wrapperDir/*; fi
mkdir -p $wrapperDir
for i in @setuidPrograms@; do
program=$(type -tp $i)
cp "$(type -tp setuid-wrapper)" $wrapperDir/$i
echo -n $program > $wrapperDir/$i.real
chown root.root $wrapperDir/$i
chmod 4755 $wrapperDir/$i
done
# Set the host name. Don't clear it if it's not configured in the
# NixOS configuration, since it may have been set by dhclient in the
# meantime.
if test -n "@hostName@"; then
hostname @hostName@
else
# dhclient won't do anything if the hostname isn't empty.
if test "$(hostname)" = "(none)"; then
hostname ''
fi
fi
# Make this configuration the current configuration.
ln -sfn "$systemConfig" /var/run/current-system
# Prevent the current configuration from being garbage-collected.
ln -sfn /var/run/current-system /nix/var/nix/gcroots/current-system