Hi! Some time ago, I started to look into NetBSD's success after reaching reproducibility for at least two ports. Being both a VAX enthusiast and somebody running CI builds for NetBSD current, I used that infrastructure to work on reproducibility for VAX, as a cross-build target building on a Linux host. That was extended to build all port/arch combinations listed in src/build.sh . After a pile of additional patches, all buildable port/arch combinations could be build reproducible on Linux, a few patches later also on NetBSD. These days, I'm chasing differences between Linux- and NetBSD-built release artifacts. TL;DR: There are two remaining generic issues and probably a small number of remaining port-specific differences.
1. Building install ISOs with `makefs` doesn't result in identical
filesystem images, as the ISOs contain a large number of files
_not_ listed in the manifest. These files retain their host's
user/group identity.
https://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=58196
2. Some ports use CTF debugging data, which is (due to n unknown
root cause) different when created with NetBSD compared to CTF
data generated on a Linux host. (I suspect that data is sorted
somewhere, but that sort isn't stable for elements considered
"equal".)
https://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=58197
A third problem was that my local tarballs of generated release
artifacts wasn't stable, too, but an update from GNU tar 1.34 -> 1.35
seems to have solved this issue.
Here is a table of current build results (NetBSD current as of a few
days ago, plus a small number of patches that still need to be
reviewed, submitted & merged):
mostly ok:
If checked [x], there are no differences within the release
files, except the ISO images.
If checked [!], there are known differences that need to be
checked. (May be CTF-related, though.)
CTF:
If checked [!], this arch (aarch64, i386, amd64, earm) uses
non-reproducible CTF debug infos.
If checked [-], this arch does not use CTF debug infos.
ISO:
If checked [!], the ISO file contain differences (due to
ISO9660 owner/group), but the actual content
files are okay.
If checked [-], this port does not build ISO images.
If checked [x], this ISO(s) are bit-identical!
perfect:
If checked [x], a tarball from result artifact created on a
Linux build host is identical to a tarball
created from NetBSD-built artifacts.
Not tested for many ports/archs as it was
pointless with GNU tar 1.34.
mst ok CTF ISO perfect
acorn32-earmv4 [!] [!] [!] [ ]
algor-mips64el [x] [-] [-] [x]
algor-mipsel [!] [-] [ ] [ ] Minimal
differences in algor/binary/kernel/netbsd-P5064.gz /
algor/binary/sets/kern-P5064.tgz
alpha-alpha [x] [-] [!] [ ]
amd64-x86_64 [!] [!] [!] [ ]
amiga-m68k [x] [-] [!] [ ]
amigappc-powerpc [x] [-] [-] [ ]
arc-mips64el [ ] [ ] [ ] [ ] Fails to build:
mipsel--netbsd-gcc: not found: No such file or directory (calling 32bit GCC
while only 64bit is configured)
arc-mipsel [x] [-] [!] [ ]
atari-m68k [x] [-] [!] [ ]
bebox-powerpc [x] [-] [-] [ ]
cats-earmv4 [!] [!] [!] [ ]
cesfic-m68k [x] [-] [-] [ ]
cobalt-mips64el [x] [-] [!] [ ]
cobalt-mipsel [x] [-] [!] [ ]
dreamcast-sh3el [!] [-] [!] [ ] Minimal
differences in dreamcast/binary/kernel/netbsd-GENERIC_MD{.bin,}.gz (like
algor-mipsel)
emips-mipseb [x] [-] [!] [ ]
epoc32-earmv4 [!] [!] [!] [ ]
evbarm-aarch64 [!] [!] [-] [ ]
evbarm-aarch64eb [!] [!] [-] [ ]
evbarm-earmv4 [!] [!] [-] [ ]
evbarm-earmv4eb [!] [!] [-] [ ]
evbarm-earmv5 [ ] [ ] [ ] [ ] Fails to build
evbarm-earmv5eb [ ] [ ] [ ] [ ] Fails to build
evbarm-earmv5hf [ ] [ ] [ ] [ ] Fails to build
evbarm-earmv5hfeb [ ] [ ] [ ] [ ] Fails to build
evbarm-earmv6 [!] [!] [-] [ ]
evbarm-earmv6eb [!] [!] [-] [ ]
evbarm-earmv6hf [!] [!] [-] [ ]
evbarm-earmv6hfeb [!] [!] [-] [ ]
evbarm-earmv7 [!] [!] [-] [ ]
evbarm-earmv7eb [!] [!] [-] [ ]
evbarm-earmv7hf [!] [!] [-] [ ]
evbarm-earmv7hfeb [!] [!] [-] [ ]
evbcf-coldfire [ ] [ ] [ ] [ ] Fails to build:
checking target system type... Invalid configuration `m5407--netbsdelf':
machine `m5407-' not recognized
evbmips-mips64eb [x] [-] [!] [ ]
evbmips-mips64el [x] [-] [!] [ ]
evbmips-mipseb [!] [-] [-] [ ]
evbmips-mipsel [!] [-] [-] [ ]
evbmips-mipsn64eb [x] [-] [!] [ ]
evbmips-mipsn64el [x] [-] [!] [ ]
evbppc-powerpc [!] [-] [!] [ ]
evbppc-powerpc64 [x] [-] [!] [ ]
evbsh3-sh3eb [x] [-] [!] [ ]
evbsh3-sh3el [x] [-] [!] [ ]
ews4800mips-mipseb [x] [-] [!] [ ]
hp300-m68k [x] [-] [!] [ ]
hpcarm-earmv4 [!] [!] [-] [ ]
hpcmips-mipsel [x] [-] [!] [ ]
hpcsh-sh3el [x] [-] [!] [ ]
hppa-hppa [!] [-] [!] [ ]
i386-i386 [!] [!] [!] [ ]
ia64-ia64 [x] [-] [!] [ ]
ibmnws-powerpc [x] [-] [!] [ ]
iyonix-earm [!] [!] [-] [ ]
landisk-sh3el [x] [-] [-] [ ]
luna68k-m68k [x] [-] [!] [ ]
mac68k-m68k [x] [-] [!] [ ]
macppc-powerpc [x] [-] [!] [ ]
macppc-powerpc64 [x] [-] [!] [ ]
mipsco-mipseb [x] [-] [!] [ ]
mmeye-sh3eb [x] [-] [!] [ ]
mvme68k-m68k [x] [-] [!] [ ]
mvmeppc-powerpc [x] [-] [!] [ ]
netwinder-earmv4 [!] [!] [!] [ ]
news68k-m68k [x] [-] [!] [ ]
newsmips-mipseb [x] [-] [!] [ ]
next68k-m68k [x] [-] [!] [ ]
ofppc-powerpc [x] [-] [!] [ ]
ofppc-powerpc64 [ ] [ ] [ ] [ ] Failed to build
(fails to link 32 vs 64 bit code)
or1k-or1k [ ] [ ] [ ] [ ] Failed to build
(No rule to make target
`/var/lib/laminar/run/netbsd-or1k-or1k/31/NetBSD-src/tools/gcc/../../external/gpl3/gcc.old/dist/gcc/config/or1k/or1k.md')
playstation2-mipsel [ ] [ ] [ ] [ ] Failed to build
(/root/NetBSD-src/usr.sbin/crash/obj/mips/mutex.h:50:2: error: unknown type
name 'ipl_cookie_t')
pmax-mips64el [x] [-] [!] [ ]
pmax-mipsel [x] [-] [!] [ ]
prep-powerpc [x] [-] [!] [ ]
riscv-riscv32 [!] [-] [!] [ ] Diff in
[base]/lib/libc.so.12.221 (.eh_frame_hdr)
riscv-riscv64 [!] [-] [!] [ ] Diff in
base{,32}.tgz
rs6000-powerpc [x] [-] [-] [ ]
sandpoint-powerpc [x] [-] [!] [ ]
sbmips-mips64eb [x] [-] [-] [x]
sbmips-mips64el [x] [-] [-] [x]
sbmips-mipseb [x] [-] [-] [x]
sbmips-mipsel [!] [-] [-] [ ] Diff in
sbmips/binary/kernel/netbsd-GENERIC.gz, sbmips/binary/sets/kern-GENERIC.tgz
sgimips-mips64eb [ ] [ ] [ ] [ ] Failed to
build: nbmake[4]: don't know how to make netbsd-INSTALL64_IP2x.gz. Stop
sgimips-mipseb [x] [-] [!] [ ]
shark-earmv4 [!] [!] [-] [ ]
sparc-sparc [!] [-] [!] [ ] Diff in
sparc/installation/bootfs/instfs.tgz, rootfs.tgz
sparc64-sparc64 [x] [-] [!] [ ]
sun2-m68000 [!] [-] [!] [ ] Diff in
sun2/binary/kernel/netbsd-RAMDISK.gz
sun3-m68k [!] [-] [!] [ ] Diff in
sun3/binary/kernel/netbsd-RAMDISK3X.gz, netbsd-RAMDISK.gz
vax-vax [x] [-] [!] [ ]
virt68k-m68k [x] [x] [-] [x]
x68k-m68k [x] [-] [!] [ ]
zaurus-earm [!] [!] [!] [ ] Diff in x11
(date in docs)
Ignoring needed fixes for ISO and CTF generation, NetBSD is on a good
track reaching reproducible build results even on quite different
build operating systems! That's a nice outcome!
Thanks,
Jan-Benedict
PS: Special thanks to Christos and other people who had a look at my
occasional GNATS PRs!
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