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support DEVBOX_CACHE mirror for nixpkgs tarballs #2780

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support DEVBOX_CACHE mirror for nixpkgs tarballs #2780

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18 changes: 14 additions & 4 deletions internal/shellgen/nixpkgs.go
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ import (
"net/http"
"os"
"time"
"log/slog"

"go.jetify.com/devbox/internal/envir"
)
Expand All @@ -19,17 +20,26 @@ type NixpkgsInfo struct {
}

func getNixpkgsInfo(commitHash string) *NixpkgsInfo {
// Default URLs pointing to GitHub
url := fmt.Sprintf("github:NixOS/nixpkgs/%s", commitHash)
tarURL := fmt.Sprintf("https://github.com/nixos/nixpkgs/archive/%s.tar.gz", commitHash)

// Check if a local/internal mirror is available via DEVBOX_CACHE
if mirror := nixpkgsMirrorURL(commitHash); mirror != "" {
url = mirror
url = mirror // flakes use this URL
tarURL = mirror // devbox shell uses this tarball URL
slog.Debug("Using local/internal mirror for nixpkgs", "commit", commitHash, "url", url, "tarURL", tarURL)
} else {
slog.Debug("No local mirror found, falling back to GitHub", "commit", commitHash, "url", url, "tarURL", tarURL)
}

return &NixpkgsInfo{
URL: url,
// legacy, used for shell.nix (which is no longer used, but some direnv users still need it)
TarURL: fmt.Sprintf("https://github.com/nixos/nixpkgs/archive/%s.tar.gz", commitHash),
URL: url,
TarURL: tarURL,
}
}


func nixpkgsMirrorURL(commitHash string) string {
baseURL := os.Getenv(envir.DevboxCache)
if baseURL == "" {
Expand Down