nixpkgs/system/activate-configuration.sh
Eelco Dolstra 80a0904196 * Set /var/run/current-system to the currently active system
configuration, and use it as a garbage collection root to prevent
  the current configuration from being GC'ed (which was previously
  possible if the configuration was activated using "nixos-rebuild
  test", or if the configuration's generation symlink had been removed
  from the system profile).

  This isn't quite right yet due to a layering problem:
  activate-configuration.sh doesn't know the top-level store path of
  the configuration.

svn path=/nixos/trunk/; revision=8379
2007-03-20 11:45:59 +00:00

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#! @shell@
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
# 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
ln -s $staticEtc/$i /etc/$i
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 $mountPoint/bin/sh
# Allow the kernel to find our wrapped modprobe (which searches in the
# right location in the Nix store for kernel modules). We need this
# when the kernel (or some module) auto-loads a module.
# !!! maybe this should only happen at boot time, since we shouldn't
# use modules that don't match the running kernel.
echo @modprobe@/sbin/modprobe > /proc/sys/kernel/modprobe
# Various log directories.
mkdir -m 0755 -p /var/run
touch /var/run/utmp # must exist
chmod 644 /var/run/utmp
mkdir -m 0755 -p /var/log
touch /var/log/wtmp # must exist
chmod 644 /var/log/wtmp
touch /var/log/lastlog
chmod 644 /var/log/lastlog
# If there is no password file yet, create a root account with an
# empty password.
if ! test -e /etc/passwd; then
rootHome=/root
touch /etc/passwd; chmod 0644 /etc/passwd
touch /etc/group; chmod 0644 /etc/group
touch /etc/shadow; chmod 0600 /etc/shadow
# Can't use useradd, since it complain that it doesn't know us
# (bootstrap problem!).
echo "root:x:0:0:System administrator:$rootHome:@shell@" >> /etc/passwd
echo "root::::::::" >> /etc/shadow
groupadd -g 0 root
echo | passwd --stdin root
fi
# Some more required accounts/groups.
if ! getent group nogroup > /dev/null; then
groupadd -g 65534 nogroup
fi
# Set up Nix accounts.
if test -z "@readOnlyRoot@"; then
if ! getent group nixbld > /dev/null; then
groupadd -g 30000 nixbld
fi
for i in $(seq 1 10); do
account=nixbld$i
if ! getent passwd $account > /dev/null; then
useradd -u $((i + 30000)) -g nogroup -G nixbld \
-d /var/empty -s /noshell \
-c "Nix build user $i" $account
fi
done
mkdir -p /nix/etc/nix
cat > /nix/etc/nix/nix.conf <<EOF
# WARNING: this file is generated.
build-users-group = nixbld
build-max-jobs = @maxJobs@
EOF
chown root.nixbld /nix/store
chmod 1775 /nix/store
fi
# Nix initialisation.
mkdir -m 0755 -p /nix/var/nix/db
mkdir -m 0755 -p /nix/var/nix/gcroots
mkdir -m 0755 -p /nix/var/nix/temproots
mkdir -m 0755 -p /nix/var/nix/profiles
mkdir -m 1777 -p /nix/var/nix/profiles/per-user
ln -sf /nix/var/nix/profiles /nix/var/nix/gcroots/
# Make a few setuid programs work.
PATH=@systemPath@/bin:@systemPath@/sbin:$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.
hostname @hostName@
# Make this configuration the current configuration.
ln -sfn @out@ /var/run/current-system
# Prevent the current configuration from being garbage-collected.
ln -sfn /var/run/current-system /nix/var/nix/gcroots/current-system