The root filesystem resizing step, `resize2fs -M', does not provide any
control over the amount of slack left in the result. It can produce an
arbitrarily tight fit, depending on how well the payload aligns with
ext4 data structures.
This is problematic, as NixOS must create a few files and directories
during its first boot, before the root is enlarged to match the size of
the containing SD card.
An overly tight fit can cause failures in the first stage:
mkdir: can't create directory '/mnt-root/proc': No space left on device
or in the second stage:
install: cannot create directory '/var': No space left on device
A previous version of `make-ext4-fs' (before PR #79368) was explicitly
"reserving" 16 MiB of free space in the final filesystem. Manually
calculating the size of an ext4 filesystem is a perilous endeavor,
however, and the method it employed was apparently unreliable.
Reverting is consequently not a good option.
A solution would be to create some sort of "balloon" occupying inodes
and blocks in the image prior to invoking `resize2fs -M', and to remove
these temporary files/directories before the compression step.
This changeset takes the simpler approach of simply dropping the
resizing step.
Note that this does *not* result in a larger image in general, as the
current procedure does not truncate the `.img' file anyway. In fact, it
has been observed to yield *smaller* compressed images---probably
because of some "noise" left after resizing. E.g., before-vs-after:
-r--r--r-- 2 root root 607M 1. Jan 1970 nixos-sd-image-21.11pre-git-x86_64-linux.img.zst
-r--r--r-- 2 root root 606M 1. Jan 1970 nixos-sd-image-21.11pre-git-x86_64-linux.img.zst
We need netbsdCross.ld_elf_so to be the dynamic linker in cross
netbsd's bintools, but netbsdCross doesn't have a libc in stdenv. So
instead, use netbsdCross.libc for netbsdCross.ld_elf_so.
* Fix varmod-localtime test by setting TZ to an absolute path to the
appropriate file in TZDIR. This avoids having an extra patch for musl
which doesn't support TZDIR at all.
* Move tests into checkPhase by applying patch from alpine
* Fix build with musl by disabling deptgt-delete_on_error test (which I
haven't debugged myself, just copied this from alpine) and fixing a
test which fails due to differing output from strerror(3) between musl
and glibc. Also we need to add a shebang to install-sh, otherwise it
won't be executed in pkgsMusl.
