Basic reporting

Example output: https://dpaste.com/FWAYRXSVM

Several TODO's left, but perhaps functional enough to merge?

Towards #9

ReadMe.md

@@ -40,6 +40,55 @@ Run the server with `uvicorn web:app --reload`
   };
 ```
 
+### Reporting
+
+At the time of writing only reports on run-time closures are supported.
+Reporting is experimental and still expected to evolve, change, and
+grow support for build-time closures as well.
+
+#### Defining a report
+
+You define a report by uploading a JSON CycloneDX SBOM as produced by
+[nix-runtime-tree-to-sbom](https://codeberg.org/raboof/nix-runtime-tree-to-sbom):
+
+```
+$ nix-store -q --tree $(nix-build '<nixpkgs/nixos/release-combined.nix>' -A nixos.iso_gnome.x86_64-linux) > tree.txt
+$ cat tree.txt | ~/dev/nix-runtime-tree-to-sbom/tree-to-cyclonedx.py > sbom.cdx.json
+$ export HASH_COLLECTION_TOKEN=XYX # your token
+$ curl -X PUT --data @sbom.cdx.json "http://localhost:8000/reports/gnome-iso-runtime" -H "Content-Type: application/json" -H "Authorization: Bearer $HASH_COLLECTION_TOKEN"
+```
+
+#### Populating the report
+
+If you want to populate the report with hashes from different builders (e.g. from
+cache.nixos.org and from your own rebuilds), use separate tokens for the different
+sources.
+
+##### With hashes from cache.nixos.org
+
+```
+$ nix shell .#utils
+$ export HASH_COLLECTION_TOKEN=XYX # your token for the cache.nixos.org import
+$ ./fetch-from-cache.sh
+```
+
+This script is still very much WIP, and will enter an infinite loop retrying failed fetches.
+
+##### By rebuilding
+
+Make sure you have the post-build hook and diff hook configured as documented above.
+
+TODO you have to make sure all derivations are available for building on your system -
+is there a smart way to do that?
+
+```
+$ export HASH_COLLECTION_TOKEN=XYX # your token for the cache.nixos.org import
+$ ./rebuilder.sh
+```
+
+This script is still very much WIP, and will enter an infinite loop retrying failed fetches.
+You can run multiple rebuilders in parallel.
+
 ## Related projects
 
 * [nix-reproducible-builds-report](https://codeberg.org/raboof/nix-reproducible-builds-report/) aka `r13y`, which generates the reports at [https://reproducible.nixos.org](https://reproducible.nixos.org). Ideally the [reporting](https://github.com/JulienMalka/nix-hash-collection/issues/9) feature can eventually replace the reports there.

fetch-from-cache.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+REPORT=$1
+export HASH_COLLECTION_SERVER=http://localhost:8000
+
+if [ "x" == "x$REPORT" ]; then
+  echo "Usage: $0 <report-name>"
+  exit 1
+fi
+
+while true; do
+  curl -H "Authorization: Bearer $HASH_COLLECTION_TOKEN" $HASH_COLLECTION_SERVER/reports/$REPORT/suggested | jq .[] | head -50 | tr -d \" | while read out
+  do
+    echo $out
+    # TODO some/most of these can probably also be taken found in the
+    # local cache (with a cache.nixos.org signature), so perhaps take them from there?
+    copy-from-cache $out
+  done
+done

rebuilder.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+REPORT=$1
+
+if [ "x" == "x$REPORT" ]; then
+  echo "Usage: $0 <report-name>"
+  exit 1
+fi
+
+while true; do
+  curl -H "Authorization: Bearer $HASH_COLLECTION_TOKEN" http://localhost:8000/reports/$REPORT/suggested | jq .[] | head | tr -d \" | while read out
+  do
+      (nix derivation show $out || exit 1) | jq keys.[] | tr -d \" | while read drv
+      do
+	  # TODO select the right output to rebuild?
+          nix-build $drv --check
+      done
+  done
+done

utils/src/bin/copy-from-cache.rs

@@ -17,6 +17,11 @@ async fn fetch<'a>(out_path: &'a str) -> (String, OutputAttestation<'a>) {
     if response == "404" {
         panic!("Metadata for [{0}] not found on cache.nixos.org", out_path);
     }
+
+    // TODO Deriver is not populated for static inputs, and may be super useful:
+    // the same output may have multiple derivers even for non-FOD derivations.
+    // Should we make it optional in the data model / API as well?
+    // https://github.com/JulienMalka/nix-hash-collection/issues/25
     let deriver = Regex::new(r"(?m)Deriver: (.*).drv").unwrap()
         .captures(&response)
         .expect(format!("Deriver not found in metadata for [{0}]", out_path).as_str())

web/__init__.py

@@ -1,6 +1,8 @@
 from collections import defaultdict
+import json
+import random
 import typing as t
-from fastapi import Depends, FastAPI, HTTPException
+from fastapi import Depends, FastAPI, Header, HTTPException, Response
 from fastapi.security.http import HTTPAuthorizationCredentials, HTTPBearer
 from fastapi.middleware.cors import CORSMiddleware
 from sqlalchemy.orm import Session
@@ -77,6 +79,23 @@ def get_drv(drv_hash: str,
 def get_drv_recap(drv_hash: str, db: Session = Depends(get_db)) -> schemas.DerivationAttestation:
     return get_drv_recap_or_404(db, drv_hash)
 
+# Suggested rebuilds
+@app.get("/reports/{name}/suggested")
+def derivations_suggested_for_rebuilding(
+    name: str,
+    token: str = Depends(get_token),
+    db: Session = Depends(get_db),
+):
+    report = crud.report(db, name)
+    if report == None:
+        raise HTTPException(status_code=404, detail="Report not found")
+    paths = report_out_paths(report)
+
+    user = crud.get_user_with_token(db, token)
+    suggestions = crud.suggest(db, paths, user)
+    random.shuffle(suggestions)
+    return suggestions[:50]
+
 @app.post("/attestation/{drv_hash}")
 def record_attestation(
     drv_hash: str,
@@ -93,4 +112,204 @@ def record_attestation(
         "Attestation accepted"
     }
 
+@app.get("/attestations/by-output/{output_path}")
+def attestations_by_out(output_path: str, db: Session = Depends(get_db)):
+    return db.query(models.Attestation).filter_by(output_path="/nix/store/"+output_path).all()
+
+def report_out_paths(report):
+    paths = []
+    for component in report['components']:
+        for prop in component['properties']:
+            if prop['name'] == "nix:out_path":
+                paths.append(prop['value'])
+    return paths
+
+@app.get("/reports")
+def reports(db: Session = Depends(get_db)):
+    reports = db.query(models.Report).all()
+    names = []
+    for report in reports:
+        names.append(report.name)
+    return names
+
+def printtree(root, deps, results, cur_indent=0, seen=None):
+  if seen is None:
+    seen = {}
+  if root in seen:
+    return "  " * cur_indent + "...\n"
+  seen[root] = True;
+
+  result = "  " * cur_indent + root[11:];
+  if root in results:
+    result = result + " " + results[root] + "\n"
+  else:
+    result = result + "\n"
+  for dep in deps:
+      if dep['ref'] == root and 'dependsOn' in dep:
+          for d in dep['dependsOn']:
+              result += printtree(d, deps, results, cur_indent+2, seen)
+              #result = result + "\n    " + d
+  return result
+
+def htmltree(root, deps, results):
+  def icon(result):
+      if result == "No builds":
+          return "❔ "
+      elif result == "One build":
+          return "❎ "
+      elif result == "Partially reproduced":
+          return "❕ "
+      elif result == "Successfully reproduced":
+          return "✅ "
+      elif result == "Consistently nondeterministic":
+          return "❌ "
+      else:
+          return ""
+  def generatetree(root, seen):
+    if root in seen:
+      return f'<summary title="{root}">...</summary>'
+    seen[root] = True;
+
+    result = f'<summary title="{root}">'
+    if root in results:
+      result = result + f'<span title="{results[root]}">' + icon(results[root]) + "</span>" + root[44:] + " "
+    else:
+      result = result + root[44:]
+    result = result + "</summary>\n"
+    result = result + "<ul>"
+    for dep in deps:
+        if dep['ref'] == root and 'dependsOn' in dep:
+            for d in dep['dependsOn']:
+                result += f'<li><details class="{d}" open>'
+                result += generatetree(d, seen)
+                result += "</details></li>"
+    result = result + "</ul>"
+    return result
+  tree = generatetree(root, {})
+  return '''
+  <html>
+  <head>
+    <style>
+      .tree{
+        --spacing : 1.5rem;
+        --radius  : 8px;
+      }
+
+      .tree li{
+        display      : block;
+        position     : relative;
+        padding-left : calc(2 * var(--spacing) - var(--radius) - 2px);
+      }
+      
+      .tree ul{
+        margin-left  : calc(var(--radius) - var(--spacing));
+        padding-left : 0;
+      }
+      
+      .tree ul li{
+        border-left : 2px solid #ddd;
+      }
+      
+      .tree ul li:last-child{
+        border-color : transparent;
+      }
+      
+      .tree ul li::before{
+        content      : '';
+        display      : block;
+        position     : absolute;
+        top          : calc(var(--spacing) / -2);
+        left         : -2px;
+        width        : calc(var(--spacing) + 2px);
+        height       : calc(var(--spacing) + 1px);
+        border       : solid #ddd;
+        border-width : 0 0 2px 2px;
+      }
+      
+      .tree summary{
+        display : block;
+        cursor  : pointer;
+      }
+      
+      .tree summary::marker,
+      .tree summary::-webkit-details-marker{
+        display : none;
+      }
+      
+      .tree summary:focus{
+        outline : none;
+      }
+      
+      .tree summary:focus-visible{
+        outline : 1px dotted #000;
+      }
+      
+      .tree li::after,
+      .tree summary::before{
+        content       : '';
+        display       : block;
+        position      : absolute;
+        top           : calc(var(--spacing) / 2 - var(--radius));
+        left          : calc(var(--spacing) - var(--radius) - 1px);
+        width         : calc(2 * var(--radius));
+        height        : calc(2 * var(--radius));
+        border-radius : 50%;
+        background    : #ddd;
+      }
+      
+    </style>
+  </head>
+  ''' + f'''
+  <body>
+    <ul class="tree">
+    <li>
+    {tree}
+    </li>
+    </ul>
+  </body>
+  </html>
+'''
+
+@app.get("/reports/{name}")
+def report(
+    name: str,
+    accept: t.Optional[str] = Header(default="*/*"),
+    db: Session = Depends(get_db),
+):
+    report = crud.report(db, name)
+    if report == None:
+        raise HTTPException(status_code=404, detail="Report not found")
+
+    if 'application/vnd.cyclonedx+json' in accept:
+        return Response(
+            content=json.dumps(report),
+            media_type='application/vnd.cyclonedx+json')
+
+    paths = report_out_paths(report)
 
+    root = report['metadata']['component']['bom-ref']
+    results = crud.path_summaries(db, paths)
+
+    if 'text/html' in accept:
+        return Response(
+            content=htmltree(root, report['dependencies'], results),
+            media_type='text/html')
+    else:
+        return Response(
+            content=printtree(root, report['dependencies'], results),
+            media_type='text/plain')
+
+@app.put("/reports/{name}")
+def define_report(
+    name: str,
+    definition: schemas.ReportDefinition,
+    token: str = Depends(get_token),
+    db: Session = Depends(get_db),
+):
+    user = crud.get_user_with_token(db, token)
+    if user == None:
+        raise HTTPException(status_code=401, detail="User not found")
+    crud.define_report(db, name, definition.root)
+    return {
+        "Report defined"
+    }