[darcs-devel] [issue2671] missing inventory files

Ben Franksen bugs at darcs.net
Mon Jan 4 17:47:57 UTC 2021

New submission from Ben Franksen <ben.franksen at online.de>:

When we clone a repo lazily and then cut the connection to the parent 
repo e.g. by removing _darcs/prefs/sources, then it can happen that a 
subsequent 'darcs log -v' fails with the dreaded

Couldn't fetch 0000000739-
in subdir inventories from sources:

Note the fine print here: it says "in subdir inventories". This does 
not happen for missing patches, because in that case we catch 
exceptions and display the patch as "[this patch is not vailable]" and 
move on. But in case of a missing inventory we have no way to proceed.

This reproducably happens if you clone a repo that ends with a tag 
using --no-cache --lazy. In this case the clone has *no* files under 
_darcs/patches and a single file under _darcs/inventories.

Strictly speaking this is not a bug, given the semantics of lazy 
clones. But the UX is not very nice here.

Perhaps we could afford to copy the whole chain of inventories even in 
a lazy clone. This will make lazy clones over e.g. http or ssh a 
little bit less fast when using --no-cache or when cloning the first 
time. However, note that even for a repo with a long history such as 
darcs itself, this pulls only 74 inventories with a combined size of 

At least this is a caveat that should be documented.

messages: 22615
nosy: bf
status: unknown
title: missing inventory files

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