base.tar.bz2 will contain the "steps" and "external" subdirectories, which we later try to create - ensure that they are deleted when restoring an early preseed; this way base.tar.bz2 works without any modification as a preseed tarball
If multiple URLs are entered in a sources listing for the same file,
each will be tried in turn, until either one succeeds, or we fail
having run out of mirrors.
In kernel bootstrap mode, the kernel (builder-hex0) includes the
ability to assemble hex0 source code, and to execute basic commands,
obviating the need for the bootstrap-seeds subdirectory.
With the bootstrap-seeds directory excluded, the image consists of
purely source code, with the exception of the boot sector, which is
assembled from hex0 code by rootfs.py, and delivered ready for BIOS
to boot.
And while we're at it, use a more sustainable way of getting the
address of the next file to be written to.
Since builder-hex0 doesn't distinguish directories from zero-length
files, this has a limitation that it won't copy any zero-length
files or empty directories. Only one such file is important for the
bootstrap process (mes/config.h), which is recreated using an
improve step.
This ends the reliance on the precompiled stage1 image in ootstrap-seeds,
and the locally committed copy of the stage2 hex0 code. Instead, both
stages are taken from the new builder-hex0 submodule, with stage1 compiled
by generator.py on the fly. The local copy of stage2 is dropped.
This way, updating to a newer builder-hex0 becomes much easier: just update
the submodule.
`mke2fs` has a `-d` option that allows to populate the newly created filesystem without needing to temporarily mount it. That allows to use `parted` and `mkfs.ext3` on regular files without needing root access.
There is nothing temporary about our "tmpdir" - its sole purpose is to
contain the final product of the bootstrap process. Thus, removing it
at the end of bootstrap amounts to doing the entire process for nothing.
To remedy this, --tmpdir is renamed --target, keeping the -t short form,
and defaulting to "target" instead of "tmp" to make its purpose clearer.
The --preserve option is removed, as the target is now always preserved.
Unless --external-sources is given, only download distfiles that
need to be included in srcfs. The rest will be downloaded anyway
by the bootstrap system once it gets network access.
To accomplish this, instead of searching steps for sources files,
we now parse steps/manifest. As a side effect, source_manifest.py
now outputs source files in the order they appear in the manifest.
* Support specifying the size of the target disk image for qemu
* For bare metal, only pad the image to the next megabyte
* Use truncate() to extend images, instead of writing zeros (faster)
* Return None from get_disk() with nonexistent name
* Leave 1MiB on non-boot disks, or 1GiB on boot disks, unpartitioned
(for proper 4K alignment and to help preserve the srcfs or boot
partition creation)
* Fix qemu invocation when an external.img is not used
* Make -qr work with kernel bootstrap (will need kexec-fiwix fix)
