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nss-mymachines: drop support for UID/GID resolving

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Now that we make the user/group name resolving available via userdb and
thus nss-systemd, we do not need the UID/GID resolving support in
nss-mymachines anymore. Let's drop it hence.

We keep the module around, since besides UID/GID resolving it also does
hostname resolving, which we care about. (One of those days we should
replace that by some Varlink logic between
nss-resolve/systemd-resolved.service too)

The hooks are kept in the NSS module, but they do not resolve anything
anymore, in order to keep compat at a maximum.
This commit is contained in:
Lennart Poettering
2020-07-14 17:08:12 +02:00
parent 4c2cf15751
commit 38ccb55731
9 changed files with 35 additions and 371 deletions
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docs/UIDS-GIDS.md
+3 -3
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@@ -132,7 +132,7 @@ but downstreams are strongly advised against doing that.)
range is above the 16bit boundary. Moreover it's below the 31bit boundary,
as some broken code (specifically: the kernel's `devpts` file system)
erroneously considers UIDs signed integers, and hence can't deal with values
above 2^31. The `nss-mymachines` glibc NSS module will synthesize user
above 2^31. The `systemd-machined.service` service will synthesize user
database records for all UIDs assigned to a running container from this
range.
@@ -240,14 +240,14 @@ the artifacts the container manager persistently leaves in the system.
| 5 | `tty` group | `systemd` | `/etc/passwd` |
| 6…999 | System users | Distributions | `/etc/passwd` |
| 1000…60000 | Regular users | Distributions | `/etc/passwd` + LDAP/NIS/… |
| 60001…60513 | Human Users (homed) | `systemd` | `nss-systemd`
| 60001…60513 | Human Users (homed) | `systemd` | `nss-systemd` |
| 60514…61183 | Unused | | |
| 61184…65519 | Dynamic service users | `systemd` | `nss-systemd` |
| 65520…65533 | Unused | | |
| 65534 | `nobody` user | Linux | `/etc/passwd` + `nss-systemd` |
| 65535 | 16bit `(uid_t) -1` | Linux | |
| 65536…524287 | Unused | | |
| 524288…1879048191 | Container UID ranges | `systemd` | `nss-mymachines` |
| 524288…1879048191 | Container UID ranges | `systemd` | `nss-systemd` |
| 1879048192…2147483647 | Unused | | |
| 2147483648…4294967294 | HIC SVNT LEONES | | |
| 4294967295 | 32bit `(uid_t) -1` | Linux | |