installer: allow generation of host-only initrd during install

During install dracut will generate a generic (i.e. large) initrd.
As we now start udev early, we can use udev metadata when generating
our initrd and thus we can generate our default, hostonly initrd.

Thus ensure relevant directories (/run) are bind mounted and fake a
/run/initramfs folder which is used in dracut to detect a boot
which will have sufficient metadata in the udev DB.

Tested with an install on a new disk and creating LVMs and
also on an install where the pre-existing LVMs were reused.

Suitable fixes to drakx-in-chroot have also been added, but
remain untested

1 files changed, 7 insertions, 2 deletions

diff --git a/perl-install/install/install2.pm b/perl-install/install/install2.pm
index 03f617154..44d9bf916 100644
--- a/perl-install/install/install2.pm
+++ b/perl-install/install/install2.pm
@@ -291,8 +291,11 @@ sub start_udev() {
     # Ensure /run is mounted
     mkdir("/run", 0755);
     run_program::run("mount -t tmpfs -o mode=0755,nosuid,nodev tmpfs /run");
-    mkdir_p("/run/udev/rules.d");
-    $ENV{UDEVRULESD} = "/run/udev/rules.d";
+
+    # Fake dracut boot (due to checks employed when running dracut during install)
+    # as we know that we'll have the needed metadata in udevadm db due to us
+    # starting udev nice and early here.
+    mkdir_p("/run/initramfs");
 
     # Start up udev and trigger cold plugs
     run_program::run("mount", "-t", "devtmpfs", "-o", "mode=0755,nosuid", "devtmpfs", "/dev");
@@ -300,6 +303,8 @@ sub start_udev() {
     run_program::run("mount", "-t", "devpts", "-o", "gid=5,mode=620,noexec,nosuid", "devpts", "/dev/pts");
     run_program::run("mount", "-t", "tmpfs", "-o", "mode=1777,nosuid,nodev", "tmpfs", "/dev/shm");
 
+    mkdir_p("/run/udev/rules.d");
+    $ENV{UDEVRULESD} = "/run/udev/rules.d";
     run_program::run("/lib/udev/udevd", "--daemon", "--resolve-names=never");
     run_program::run("udevadm", "trigger", "--type=subsystems", "--action=add");
     run_program::run("udevadm", "trigger", "--type=devices", "--action=add");