Timestamps encoded in tar file

[pavelzw]

❯ pixi-pack pack -o env1.tar
⏳ Downloading 3 packages...
📦 Created pack at env1.tar with size 6.05 MiB.
❯ pixi-pack pack -o env2.tar
⏳ Downloading 3 packages...
📦 Created pack at env2.tar with size 6.05 MiB.
❯ sha256sum env*.tar
aa42d191320d39b64c8cb9a83ec7a1b19dc67a9fe36a61aa133437c28c475053  env1.tar
c5fa50a37ac57d73d7640de8a0cd9522732e862af0cf91f9c9fb1cc73ca11174  env2.tar
❯ pixi exec diffoscope env*.tar
--- env1.tar
+++ env2.tar
├── file list
│ @@ -1,9 +1,9 @@
│ -drwxr-xr-x   0      501       20        0 2024-08-08 11:23:13.000000 ./
│ -drwxr-xr-x   0      501       20        0 2024-08-08 11:23:13.000000 channel
│ -drwxr-xr-x   0      501       20        0 2024-08-08 11:23:13.000000 channel/osx-arm64
│ --rw-r--r--   0      501       20   154517 2024-08-08 11:23:13.000000 channel/osx-arm64/ca-certificates-2024.7.4-hf0a4a13_0.conda
│ --rw-r--r--   0      501       20  3284536 2024-08-08 11:23:13.000000 channel/osx-arm64/pixi-pack-0.1.5-h563f0a8_0.conda
│ --rw-r--r--   0      501       20  2899682 2024-08-08 11:23:13.000000 channel/osx-arm64/openssl-3.3.1-hfb2fe0b_2.conda
│ --rw-r--r--   0      501       20     1698 2024-08-08 11:23:13.000000 channel/osx-arm64/repodata.json
│ --rw-r--r--   0      501       20       47 2024-08-08 11:23:13.000000 pixi-pack.json
│ --rw-r--r--   0      501       20      153 2024-08-08 11:23:13.000000 environment.yml
│ +drwxr-xr-x   0      501       20        0 2024-08-08 11:23:16.000000 ./
│ +drwxr-xr-x   0      501       20        0 2024-08-08 11:23:16.000000 channel
│ +drwxr-xr-x   0      501       20        0 2024-08-08 11:23:16.000000 channel/osx-arm64
│ +-rw-r--r--   0      501       20   154517 2024-08-08 11:23:16.000000 channel/osx-arm64/ca-certificates-2024.7.4-hf0a4a13_0.conda
│ +-rw-r--r--   0      501       20  3284536 2024-08-08 11:23:16.000000 channel/osx-arm64/pixi-pack-0.1.5-h563f0a8_0.conda
│ +-rw-r--r--   0      501       20  2899682 2024-08-08 11:23:16.000000 channel/osx-arm64/openssl-3.3.1-hfb2fe0b_2.conda
│ +-rw-r--r--   0      501       20     1698 2024-08-08 11:23:16.000000 channel/osx-arm64/repodata.json
│ +-rw-r--r--   0      501       20       47 2024-08-08 11:23:16.000000 pixi-pack.json
│ +-rw-r--r--   0      501       20      153 2024-08-08 11:23:16.000000 environment.yml

We should set it to some fixed value s.t. the files are reproducible: https://reproducible-builds.org/docs/archives/

[xhochy]

This should be the timestamps the files already have in the conda package.

[pavelzw]

They are located in info/index.json and should be present in the rattler struct. For pixi-pack.json, repodata.json and environment.yml we need to set a fixed date, for example 2024-01-01.

[pavelzw]

When downloading with wget https://anaconda.org/conda-forge/pixi-pack/0.1.5/download/osx-arm64/pixi-pack-0.1.5-h563f0a8_0.conda we get the correct date 🤔 maybe it's rattler doing weird things to the file s.t. the date is changed