Dear,
Thank you for the bug report. It is something already noticed [1] but
without a clean bug report to track it. :-)
1:
http://issues.guix.gnu.org/issue/39258#86
On Mon, 22 Jun 2020 at 19:07, Marinus <
marinus.savoritias@disroot.org> wrote:
Run into a determinism problem today with guix pull.
I run guix pull --rounds=3 but guix ended in error that the result
wasn't the same.
For reproducing, the simplest is:
--8<---------------cut here---------------start------------->8---
$ guix build --check --no-grafts -K \
$(guix gc --derivers \
$(readlink -f ~/.config/guix/current/lib/guix/package.cache))
The following profile hooks will be built:
/gnu/store/l50sinckbl1y0fz2y4yk4vvfdvay9c8l-guix-package-cache.drv
/gnu/store/h69hdf14c11q7dip0gssfd4cv0qw8j7k-guix-package-cache.drv
building package cache...
(repl-version 0 1 1)
Generating package cache for '/gnu/store/67zi87xwv2d90kx8pzxsbw2q7qkh11ns-profile'...
(values (value "/gnu/store/0009whxhfz00lm027wbars8q4wb3rvia-guix-package-cache/lib/guix/package.cache"))
guix build: error: derivation `/gnu/store/h69hdf14c11q7dip0gssfd4cv0qw8j7k-guix-package-cache.drv' may not be deterministic: output `/gnu/store/0009whxhfz00lm027wbars8q4wb3rvia-guix-package-cache' differs
--8<---------------cut here---------------end--------------->8---
Then the usual "diffoscope":
--8<---------------cut here---------------start------------->8---
diffoscope \
/gnu/store/0009whxhfz00lm027wbars8q4wb3rvia-guix-package-cache/lib/guix/package.cache \
/gnu/store/0009whxhfz00lm027wbars8q4wb3rvia-guix-package-cache-check/lib/guix/package.cache\
| head -n50
--8<---------------cut here---------------end--------------->8---
outputs something like:
--8<---------------cut here---------------start------------->8---
--- /gnu/store/0009whxhfz00lm027wbars8q4wb3rvia-guix-package-cache/lib/guix/package.cache
+++ /gnu/store/0009whxhfz00lm027wbars8q4wb3rvia-guix-package-cache-check/lib/guix/package.cache
├── readelf --wide --file-header {}
│ @@ -6,15 +6,15 @@
│ OS/ABI: <unknown: ff>
│ ABI Version: 0
│ Type: DYN (Shared object file)
│ Machine: None
│ Version: 0x1
│ Entry point address: 0x0
│ Start of program headers: 64 (bytes into file)
│ - Start of section headers: 4900296 (bytes into file)
│ + Start of section headers: 4900456 (bytes into file)
│ Flags: 0x0
│ Size of this header: 64 (bytes)
│ Size of program headers: 56 (bytes)
│ Number of program headers: 3
│ Size of section headers: 64 (bytes)
│ Number of section headers: 20
│ Section header string table index: 17
├── readelf --wide --program-header {}
│ @@ -1,16 +1,16 @@
│
│ Elf file type is DYN (Shared object file)
│ Entry point 0x0
│ There are 3 program headers, starting at offset 64
│
│ Program Headers:
│ Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
│ - LOAD 0x000000 0x0000000000000000 0x0000000000000000 0x286a68 0x286a68 R 0x10000
│ - LOAD 0x290000 0x0000000000290000 0x0000000000290000 0x21c5c8 0x21c5c8 RW 0x10000
│ - DYNAMIC 0x286a08 0x0000000000286a08 0x0000000000286a08 0x000060 0x000060 R 0x8
│ + LOAD 0x000000 0x0000000000000000 0x0000000000000000 0x286b78 0x286b78 R 0x10000
│ + LOAD 0x290000 0x0000000000290000 0x0000000000290000 0x21c668 0x21c668 RW 0x10000
│ + DYNAMIC 0x286b18 0x0000000000286b18 0x0000000000286b18 0x000060 0x000060 R 0x8
│
│ Section to Segment mapping:
│ Segment Sections...
│ 00 .rodata .rtl-text .dynamic
│ 01 .data
│ 02 .dynamic
├── readelf --wide --sections {}
│┄ stderr from `readelf --wide --sections {}`:
│┄ readelf: Warning: [ 5]: Link field (0) should index a string section.
│ @@ -1,29 +1,29 @@
│ -There are 20 section headers, starting at offset 0x4ac5c8:
│ +There are 20 section headers, starting at offset 0x4ac668:
--8<---------------cut here---------------end--------------->8---
Well, I do not know what should the next step. I mean this
"package.cache" file is created by the function
gnu/packages.scm:(generate-package-cache) which reads:
--8<---------------cut here---------------start------------->8---
;; Store the cache as a '.go' file. This makes loading fast and reduces
;; heap usage since some of the static data is directly mmapped.
(put-bytevector port
(compile `'(,@exp)
#:to 'bytecode
#:opts '(#:to-file? #t)))))
--8<---------------cut here---------------end--------------->8---
Then it is on the Guile side, isn't it?
All the best,
simon