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main: allow seed setting

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Allow users to define the seed that's used for manifest generation.
Regenerating an image with a given seed leads to the same manifest
(provided depsolving does the same).

The seed is normally mostly used to generate random filesystem UUIDs.

This will need a bunch of documentation in a follow up since the use
cases are meant to be advanced but it can really speed up multi-type and
rebuilds of the same image.

Signed-off-by: Simon de Vlieger <supakeen@redhat.com>
This commit is contained in:
Simon de Vlieger 2025-03-31 09:10:24 +02:00
parent f25b5e325e
commit 02461ac2a3
3 changed files with 46 additions and 0 deletions
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10
cmd/image-builder/main.go
View file

@ -151,6 +151,14 @@ func cmdManifestWrapper(pbar progress.ProgressBar, cmd *cobra.Command, args []st
if err != nil {
return nil, err
}
var customSeed *int64
if cmd.Flags().Changed("seed") {
seedFlagVal, err := cmd.Flags().GetInt64("seed")
if err != nil {
return nil, err
}
customSeed = &seedFlagVal
}
// no error check here as this is (deliberately) not defined on
// "manifest" (if "images" learn to set the output filename in
// manifests we would change this
@ -189,6 +197,7 @@ func cmdManifestWrapper(pbar progress.ProgressBar, cmd *cobra.Command, args []st
Ostree: ostreeImgOpts,
RpmDownloader: rpmDownloader,
WithSBOM: withSBOM,
CustomSeed: customSeed,
ForceRepos: forceRepos,
}
@ -398,6 +407,7 @@ operating systems like Fedora, CentOS and RHEL with easy customizations support.
Hidden: true,
}
manifestCmd.Flags().String("blueprint", "", `filename of a blueprint to customize an image`)
manifestCmd.Flags().Int64("seed", 0, `rng seed, some values are derived randomly, pinning the seed allows more reproducibility if you need it. must be an integer. only used when changed.`)
manifestCmd.Flags().String("arch", "", `build manifest for a different architecture`)
manifestCmd.Flags().String("distro", "", `build manifest for a different distroname (e.g. centos-9)`)
manifestCmd.Flags().String("ostree-ref", "", `OSTREE reference`)

2
cmd/image-builder/manifest.go
View file

@ -24,6 +24,7 @@ type manifestOptions struct {
Ostree *ostree.ImageOptions
RpmDownloader osbuild.RpmDownloader
WithSBOM bool
CustomSeed *int64
ForceRepos []string
UseBootstrapContainer bool
@ -55,6 +56,7 @@ func generateManifest(dataDir string, extraRepos []string, img *imagefilter.Resu
Output: output,
RpmDownloader: opts.RpmDownloader,
UseBootstrapContainer: opts.UseBootstrapContainer,
CustomSeed: opts.CustomSeed,
}
if opts.WithSBOM {
outputDir := basenameFor(img, opts.OutputDir)