** Changed in: systemd (Ubuntu)
Status: In Progress => Fix Committed
** Description changed:
libnss-{resolve,mymachines,myhostname} automatically add/remove
themselves from /etc/nsswitch.conf on installation/removal.
But when (manually) adding NSS action specifiers, these do not get
removed along.
+
+ SRU FIX: https://anonscm.debian.org/cgit/pkg-
+ systemd/systemd.git/commit/?h=ubuntu-xenial&id=2d08d7e481
TEST CASE:
* Install libnss-mymachines. This will change the "hosts" line in
/etc/nsswitch.conf from e. g. "files dns" to "files dns mymachines".
* Edit the file to add an action specifier: "files dns mymachines
[!UNAVAIL=return]"
* Remove/purge libnss-mymachines.
* In current xenial (229-4ubuntu7)/yakkety (231-6) the hosts line ends up
as "files dns [!UNAVAIL=return]", i. e. the action specifier now applies to
"dns" but should have been removed.
* With the fixed version, the action specifier is completely gone.
* Re-test with installing libnss-resolve (which inserts itself before
"dns") and modifying to "files resolve [!UNAVAIL=return] dns [foo=bar]", then
purge libnss-resolve again -- this should again remove the [!UNAVAIL=return]
but *NOT* "dns [foo=bar]".
** Changed in: systemd (Ubuntu Xenial)
Status: Triaged => In Progress
** Description changed:
libnss-{resolve,mymachines,myhostname} automatically add/remove
themselves from /etc/nsswitch.conf on installation/removal.
But when (manually) adding NSS action specifiers, these do not get
removed along.
SRU FIX: https://anonscm.debian.org/cgit/pkg-
systemd/systemd.git/commit/?h=ubuntu-xenial&id=2d08d7e481
TEST CASE:
* Install libnss-mymachines. This will change the "hosts" line in
/etc/nsswitch.conf from e. g. "files dns" to "files dns mymachines".
* Edit the file to add an action specifier: "files dns mymachines
[!UNAVAIL=return]"
* Remove/purge libnss-mymachines.
* In current xenial (229-4ubuntu7)/yakkety (231-6) the hosts line ends up
as "files dns [!UNAVAIL=return]", i. e. the action specifier now applies to
"dns" but should have been removed.
* With the fixed version, the action specifier is completely gone.
* Re-test with installing libnss-resolve (which inserts itself before
"dns") and modifying to "files resolve [!UNAVAIL=return] dns [foo=bar]", then
purge libnss-resolve again -- this should again remove the [!UNAVAIL=return]
but *NOT* "dns [foo=bar]".
+
+ Regression potential: This only affects package removal, so upgrades or
+ new installs are not affected. Removals of
+ libnss-{mymachines,myhostname,resolvle} must be tested carefully to
+ ensure that they don't break nsswitch.conf in any way.
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https://bugs.launchpad.net/bugs/1625584
Title:
Removing libnss-* does not remove corresponding options
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