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Author SHA1 Message Date
Eelco Dolstra b95faccf03 Merge remote-tracking branch 'origin/master' into auto-uid-allocation 2022-11-03 17:43:40 +01:00
Bernardo Meurer 931930feb1 fix(libstore/lock): support users that belong to more than 10 groups
The manpage for `getgrouplist` says:

> If the number of groups of which user is a member is less than or
> equal to *ngroups, then the value *ngroups is returned.
>
> If the user is a member of more than *ngroups groups, then
> getgrouplist() returns -1.  In this case, the value returned in
> *ngroups can be used to resize the buffer passed to a further
> call getgrouplist().

In our original code, however, we allocated a list of size `10` and, if
`getgrouplist` returned `-1` threw an exception. In practice, this
caused the code to fail for any user belonging to more than 10 groups.

While unusual for single-user systems, large companies commonly have a
huge number of POSIX groups users belong to, causing this issue to crop
up and make multi-user Nix unusable in such settings.

The fix is relatively simple, when `getgrouplist` fails, it stores the
real number of GIDs in `ngroups`, so we must resize our list and retry.
Only then, if it errors once more, we can raise an exception.

This should be backported to, at least, 2.9.x.
2022-06-08 13:45:41 -04:00
John Ericson dc92b01885 Merge remote-tracking branch 'upstream/master' into auto-uid-allocation 2022-02-28 23:54:20 +00:00
John Ericson 801e6d96d8 Merge commit 'd334fd48824b41b57e267cd2926fa9619b7718e3' into auto-uid-allocation 2020-10-17 19:31:06 +00:00
John Ericson bcb67e1ed8 Trim lock.cc 2020-10-11 16:44:19 +00:00
John Ericson e0be04129b Rename to hand-hold git (lock.cc) 2020-10-11 16:44:14 +00:00
Renamed from src/libstore/build.cc (Browse further)