The gap between the chroot and non-chroot bootstrap modes started in,
7ecad37 because BuildStream's sandbox was missing some device nodes.
With the latest version of buildbox-run-bubblewrap, a few of the
missing devices were made available to BuildStream's sandbox and
there is no longer a need to keep this gap. In fact, compatibilty
with newer BuildStream versions now requires these devices to be
present.
This change also partially reverts d0a5221, which had to remove
/dev/ptmx as a consequence of the aforementioned gap.
A tiny bootloader bootstrap has been added to compile the builder-hex0 kernel from hex0 source.
The boot compiler is builder-hex0-x86-stage1.hex0 and builder-hex0-x86-stage1.bin.
The builder-hex0 kernel is now named builder-hex0-x86-stage2.hex0.
The inclusion of a binary seed resolves the problem with the previous strategy which used an
architecture-specific hex0 compiler.
If sysb detects a full disk (i.e. DISK=sda) it now partitions the disk unconditionally because
previously fdisk was reporting existing but empty partitions which resulted in no
parititions being created.
e2fsprogs is now built with --disable-tls because musl was built on Fiwix without full threading
support and mkfs.ext4 was crashing without disabling thread local storage.
kexec-linux writes the linux kernel and initramfs to a RAM drive on Fiwix which ensure
a pre-allocated contiguous memory block. The following is written to the ram drive:
a 32-bit number which is the size of the kernel in bytes, a 32-bit number which is the size
of the initramfs in bytes, followed by the Linux kernel image, followed by the initramfs.
kexec-fiwix invokes a sync syscall to ensure all writes are flushed to
the ram drive and then initiates the kexec by shutting down Fiwix with a reboot syscall.
Fiwix knows whether and how to perform the kexec based on kernel parameters passed to it.
The main motivations to have this are:
* Detect checksum changes with chroot/bwrap builds
* Avoid removing checksums from `SHA256SUMS.pkgs` when unsing `--update-checksums`
* Find crashes that would otherwise be missed in `builder-hex0`
Ensures that when `--external-sources` is used, the build does not require a working internet connection.
`--unshare-net` is always passed for the sysa phase.
By using --cores argument to rootfs.py, JOBS= is set in the
live-bootstrap environment, and -j${JOBS} is used on builds. This speeds
larger packages up significantly.
A fair number of packages do not build properly with parallelism. Most
of these, at least for now, are disabled with -j1.
- Split out tmpdir logic into a separate entity & add the appropriate
arguments and checks.
- sysb can be removed since there is now no associated logic.
- Move disk/etc logic into tmpdir.py.
- disk to be created (blank disk given to live-bootstrap) (default)
- disk to already exist but sources downloaded within live-bootstrap
- sources to be downloaded outside live-bootstrap (non-blank disk given
to live-bootstrap)
Also migrate sysb to use sys_transfer in QEMU mode also.
Note that this means copy_sysc is now irrelevant. sysc is *always*
sourced from sysa.
Set up a bubblewrap sandbox suitable for bootstrap. Since bubblewrap
can operate without root permissions when user namespaces are
allowed, this effectively adds a rootless bootstrap mode.
Root access is required for creating tmpfs mounts in the context of
the current mount namespace, and creating a tmpfs in the context of a
new mount namespace is less useful because a process in the parent
namespace can't easily access it.
So add an option to avoid creating tmpfs mounts, which will be used by
the rootless bootstrap mode for now.
In addition, when tmp directories aren't mounted as tmpfs, their
contents can't be removed using os.umount(). So instead remove them
recursively using shutil.rmtree().
This keeps the prepartion and bootstrap initiation logic in the same
place for each bootstrap mode, and allows each mode to specify its
own requirements and expectations from the different bootstrap steps.
- Rename sources to distfiles for clarity.
- Per sys(a/c) distfiles to reduce rootfs.py processing and reduce RAM
usage in sysa.
- Canonicalise early kaem mes/tcc files to kaem script conventions.
- Cleanup unused setup in python.
- Add parts.rst documentation for Linux kernel.
- Completely fix problems caused by new bootstrap, update checksums for
/usr.
- Globalise populate_device_nodes.
- Enable deblobbing.
- We do not use latest 4.9.x because it relies on a new version of
binutils, while older versions do not. (Note: we should be able to go
a bit newer but I didn't bother testing >50 versions to figure this
out).
- We do not use newer kernel versions because they require one or more
of (new perl, new binutils, new make, new gcc, new bison, new tar).
- sysb and sysc are updated to use the SATA (libata) subsystem (aka sda)
instead of IDE-emulating SATA subsystem (aka hda) which is now
available to us.
- While theoretically according to docs 4.9 should work OOTB with our
version of binutils this is not the case, so we have to do a bit of
(interesting) patching. But this does not break anything.
- Thankfully serial support in 4.9 is not screwed over like it is in 2.6
so we can revert to that.
- 4.9 has the linux-libre project at our disposal, instead of gNewSense.
So we use this. Unfortunatley that takes forever because we have to
use sed because our version of gawk is too old/buggy. :( I plan to
introduce very shortly 1. parallelism 2. 'sysc snapshot' which will
start from sysc to avoid this. I do not want to use linux-libre
tarballs because they make modificiations directly from this script
(aka not easily verifiable, use the source!) and this script allows
for much greater flexibility.
- We compile the initramfs ahead-of-build using the in-tree cpio
generator instead of also building cpio to use less packages. We do
NOT build the initramfs into the kernel like 2.6 (unsupported).
- Oh and fix a kexec-tools checksum.
Now that we have the Linux Kernel built, we move to a full-disk (rather
than initramfs) setup in sysc. However, we cannot assume the seed kernel
has support for mounting hard drives. So, first we need to kexec into
sysb, which is used as a jumping off point to create the hard drive for
sysc.
Additionally, since 2.6.16 does not have support for on-demand initramfs
(initramfs must be built into kernel), we will have to rebuild the linux
kernel within sysb without the initramfs.
All of this process is not performed for chroot mode. Instead, we skip
sysb and jump straight to sysc, copying over appropriate data.
The python scripts have been changed slightly. Each sys* inherits
SysGeneral, which contains various functions which are not specific to
any sys* and simplifies those files. rootfs now also handles sysb and
sysc.
bootstrap.cfg also gives an indication whether we are running in a
chroot to avoid attempting to kexec/mount within a chroot.
use branch v0.7 from kritis-linux and change settings
to be more i386-alike and add essential kernel feature
'flock' using latest kernel 3.18.140 from 3.18.x-branch
(+minor indentation fixes)
fosslinux
Andrius Štikonas
Seppo Yli-Olli
Dor Askayo
Paul Dersey
rick-masters
Eduardo Sánchez Muñoz
Melg Eight
Bastian Bittorf