1 files changed, 138 insertions, 0 deletions
diff --git a/bin/nixpkgs_drv_pname.py b/bin/nixpkgs_drv_pname.py
new file mode 100755
index 0000000..7209537
--- /dev/null
+++ b/bin/nixpkgs_drv_pname.py
@@ -0,0 +1,138 @@
+#!/usr/bin/env python3
+
+# This script is used to evaluate Nixpkgs and store the relationships between
+# derivations and their input derivations in a directed acyclic graph (DAG).
+# The DAG is represented using an adjacency list and saved in a SQLite db
+
+import re
+import sys
+import subprocess
+import json
+import sqlite3
+import argparse
+from typing import Set
+
+class drv:
+    drv: str
+    pname: str
+    input_drv_pnames: Set[str] = set()
+    cursor: sqlite3.Cursor
+
+    def __init__(self, drv_string: str, cursor: sqlite3.Cursor) -> None:
+        self.cursor = cursor
+
+        j = json.loads(drv_string)
+        if 'error' in j:
+            raise TypeError(f'{j['attrPath']}: Failed to evaluate')
+        elif 'drvPath' not in j:
+            raise TypeError(f'{j['attrPath']}: Failed to read drvPath')
+
+        self.drv = str(j['drvPath'])
+        pname = self.pname_from_drv_path(j['drvPath'])
+        if pname is None:
+            raise TypeError(f'{j['attrPath']}: Failed to read pname')
+        print(pname)
+        self.pname = pname
+
+        for input_drv in j['inputDrvs']:
+            pname = self.pname_from_drv_path(input_drv)
+            if pname is not None:
+                self.input_drv_pnames.add(pname)
+
+    def db_push(self):
+        pname_id = self.rowid_from_pname(self.cursor, self.pname)
+        ret =self.cursor.execute("""
+            INSERT INTO drvs (drv, pname_id)
+            VALUES (?, ?)
+        """, (self.drv, pname_id))
+        drv_id = ret.lastrowid
+        if drv_id is None:
+            raise ValueError
+
+        for pname in self.input_drv_pnames:
+            pname_id = self.rowid_from_pname(self.cursor, pname)
+            ret = self.cursor.execute("""
+                INSERT INTO input_pnames (drv_id, pname_id)
+                VALUES (?, ?)
+            """,  (drv_id, pname_id))
+
+    @staticmethod
+    def rowid_from_pname(cursor: sqlite3.Cursor, pname: str) -> int:
+        s = cursor.execute("""
+            SELECT pnames.ROWID FROM pnames
+            WHERE pnames.pname = ?
+        """, (pname,))
+        id = s.fetchone()
+        if id:
+            return id[0]
+        
+        s = cursor.execute("""
+            INSERT INTO pnames (pname)
+            VALUES (?)
+        """, (pname,))
+        if s.lastrowid is None:
+            raise TypeError('Failed to get lastrowid')
+
+        return s.lastrowid
+
+    @staticmethod
+    def pname_from_drv_path(drv_path: str) -> str | None:
+        f = open(drv_path, 'r')
+        drv_string = f.readline()
+        match = re.search('"pname","([^"]+)', drv_string)
+        if match is not None:
+            return match.group(1)
+
+def args_get():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-r', '--ref', default="master")
+    parser.add_argument('-a', '--arch', default="x86_64-linux")
+    return parser.parse_args()
+
+if __name__ == '__main__':
+    args = args_get()
+    cmd = [
+        'nix-eval-jobs',
+        '--flake',
+        f'github:nixos/nixpkgs/{args.ref}#legacyPackages.{args.arch}'
+    ]
+    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE,
+                            stderr=subprocess.DEVNULL)
+    if proc.stdout is None:
+        raise EOFError('Failed to evaluate nixpkgs')
+
+    con = sqlite3.connect('drv_pname_dag.db')
+    cur = con.cursor()
+    cur.execute("""
+        CREATE TABLE IF NOT EXISTS pnames (
+            pname TEXT NOT NULL UNIQUE,
+            UNIQUE(pname) ON CONFLICT REPLACE
+        )
+    """)
+    cur.execute("""
+        CREATE TABLE IF NOT EXISTS drvs (
+            drv TEXT NOT NULL,
+            pname_id INTEGER NOT NULL,
+            FOREIGN KEY(pname_id) REFERENCES pnames(ROWID),
+            UNIQUE(drv) ON CONFLICT REPLACE
+        )
+    """)
+    cur.execute("""
+        CREATE TABLE IF NOT EXISTS input_pnames (
+            drv_id INTEGER NOT NULL,
+            pname_id INTEGER NOT NULL,
+            FOREIGN KEY(drv_id) REFERENCES drvs(ROWID),
+            FOREIGN KEY(pname_id) REFERENCES pnames(ROWID),
+            UNIQUE(drv_id, pname_id) ON CONFLICT REPLACE
+        )
+    """)
+
+    for line in proc.stdout:
+        try:
+            d = drv(line.decode('utf-8'), cur)
+            d.db_push()
+        except Exception as e:
+            print(f'>>> {e}', file=sys.stderr)
+
+    con.commit()
+    con.close()