about summary refs log tree commit diff
diff options
context:
space:
mode:
authorFlorian Klink <flokli@flokli.de>2024-03-01T09·22+0200
committerflokli <flokli@flokli.de>2024-03-03T16·53+0000
commitb0e5a932ece4f94628cb44addc965799650b243e (patch)
tree73befdbe53f2e5a920249b2ff16eacb05c43238f
parentc9514b7c0c745ff8848a6e135c4d058dda76d795 (diff)
docs(tvix): remove differences-drv-paths.md r/7647
This was true while we didn't do string contexts, but drvPath should not
differ anymore.

Change-Id: I58e6ed439519bd4d68259d1577946f3c65110dc4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11074
Tested-by: BuildkiteCI
Reviewed-by: edef <edef@edef.eu>
Autosubmit: flokli <flokli@flokli.de>
-rw-r--r--tvix/docs/src/SUMMARY.md1
-rw-r--r--tvix/docs/src/differences-drv-paths.md35
2 files changed, 0 insertions, 36 deletions
diff --git a/tvix/docs/src/SUMMARY.md b/tvix/docs/src/SUMMARY.md
index d4585c00acdf..f9b069d42c5a 100644
--- a/tvix/docs/src/SUMMARY.md
+++ b/tvix/docs/src/SUMMARY.md
@@ -2,7 +2,6 @@
 
 # Tvix
 - [Architecture & data flow](./architecture.md)
-- [.drvPath inconsistencies](./differences-drv-paths.md)
 
 # Nix
 - [Specification of the Nix Language](./language-spec.md)
diff --git a/tvix/docs/src/differences-drv-paths.md b/tvix/docs/src/differences-drv-paths.md
deleted file mode 100644
index f1c90bd52892..000000000000
--- a/tvix/docs/src/differences-drv-paths.md
+++ /dev/null
@@ -1,35 +0,0 @@
-# .drvPath inconsistencies / Why .drvPath differs between Nix and Tvix
-
-Nix and Tvix currently use a different approach when it comes to tracking input
-references, in order to build the right dependencies in advance.
-Nix is using string contexts, whereas Tvix is doing reference scanning [^inbox-drvpath].
-
-There are some real-life cases, for example during nixpkgs bootstrapping, where
-multiple different fixed-output derivations are written to produce the same
-hash.
-
-For example, bootstrap sources that are downloaded early are fetched using
-a special "builder hack", in which the `builder` field of the derivation is
-populated with the magic string `builtin:fetchurl` and the builder itself will
-perform a fetch, with everything looking like a normal derivation to the user.
-
-These bootstrap sources are later on defined *again*, once `curl`is available,
-to be downloaded using the standard pkgs.fetchtarball mechanism, but yielding
-the *same* outputs (as the same files are being fetched).
-
-In our reference scanning implementation, this output scanning of FOD will
-cause the path of the *first* derivation producing the given fixed output to be
-stored in the `inputDrvs` field of the derivation, while Nix will point to the
-derivation that was actually used.
-
-This doesn't cause any differences in the calculated *output paths*, as paths to
-fixed-output derivations are replaced with a special
-`fixed:out:${algo}:${digest}:${fodPath}` string that doesn't contain the "path
-to the wrong derivation" anymore.
-
-As we haven't fully determined if our reference scanning approach is gonna work,
-and comparing output paths is sufficient to determine equality of the build
-instructions, this is left as a future work item.
-
-
-[^inbox-drvpath]: https://inbox.tvl.su/depot/20230316120039.j4fkp3puzrtbjcpi@tp/T/#t