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I could add that commit to the database, evaluate it, and load all > the sources. I=E2=80=99m inclined not to, but I=E2=80=99m open to being = convinced. (I > really like how simple the current system is conceptually.) I understand. Especially on the light of=E2=80=A6 > That=E2=80=99s about it. To my mind, =E2=80=9CThe History of the Guix Pa= ckage Database=E2=80=9D > *is* the first parent walk that you describe. Of course, that=E2=80=99s = just my > feeling. There=E2=80=99s lots of room for disagreement there. Basically= , if > you can=E2=80=99t reach a commit by starting at 1.0.0 and running =E2=80= =98guix pull=E2=80=99 > without arguments, it doesn=E2=80=99t exist! =E2=80=A6this. I agree that the aim is the guarantee of a preservation for revisions only reachable by =E2=80=9Cguix pull=E2=80=9D. Aside PoG, this raises a point that I asked elsewhere. The time-machine is able to go any revisions, but 1. some revisions are known to fail and 2. only some revisions are preserved. Therefore, something appears to me missing: advertise about this collection of =E2=80=9Cworking=E2=80=9D re= visions. *working still a vague meaning. :-) Well, I do not know via which mechanism? Maybe add something as narinfo or else attached to this collection of =E2=80=9Cworking=E2=80=9D revisions.= Then, guix time-machine --commit=3D1234abcd -- help would warn that this 1234abcd is not part of this collection and there is no guarantee it would work. I do not know, I am thinking loud. :-) > More or less. Burning CPU is definitely the main thing holding back > processing all the commits, but it would likely take a bit of effort to > get code that works for around one hundred commits to work for > thousands. The second thing is diminishing returns. Burning *way* more > CPU to track down a couple sources feels a little wasteful to me. > > For me, the scope of PoG is perfect the way it is. It=E2=80=99s big enou= gh to > be useful, but not so big to be overwhelming. There are lots of serious > problems to be addressed, too. I understand and I agree. Cheers, simon