The amule group has gid 1001 on my system, which clashes with GIDs for other real users on another system.

The cause is a still-present bug in the `amule.install` script. I think using `groupadd --system` is all that's needed to fix it.

--- /var/lib/pacman/local/amule-10983-3/install 2017-05-17 10:54:01.000000000 -0300
+++ amule.install 2017-06-14 18:08:39.789805703 -0300
@@ -13,7 +13,7 @@

post_upgrade() {
# create user/group that the daemon will run as by default, do not delete this on uninstall, as it will own files
- getent group amule >/dev/null || groupadd amule
+ getent group amule >/dev/null || groupadd --system amule
getent passwd amule >/dev/null || useradd --system -c 'aMule Client' -g amule -d '/var/lib/amule' -m -s /bin/false amule

if [ ! -e /var/lib/amule/.aMule/amule.conf ]; then

-----

Using `useradd --system --user-group` might be better. (And make the package install slightly faster, since `groupadd` would usually never run. getent group amule would find the group just created by useradd.) Or maybe this is worse, since it might break if the amule group exists but the user doesn't (IDK what useradd --user-group does in that case).

# hand-edited diff
--- /var/lib/pacman/local/amule-10983-3/install 2017-05-17 10:54:01.000000000 -0300
+++ amule.install 2017-06-14 18:08:39.789805703 -0300
@@ -13,7 +13,7 @@

post_upgrade() {
# create user/group that the daemon will run as by default, do not delete this on uninstall, as it will own files
- getent group amule >/dev/null || groupadd amule
- getent passwd amule >/dev/null || useradd --system -c 'aMule Client' -g amule -d '/var/lib/amule' -m -s /bin/false amule
+ getent passwd amule >/dev/null || useradd --system --user-group -c 'aMule Client' -d '/var/lib/amule' -m -s /bin/false amule
+ getent group amule >/dev/null || groupadd --system amule

if [ ! -e /var/lib/amule/.aMule/amule.conf ]; then

------------


There's no clean way to retroactively fix it for systems where the group already exists, so best not to try, especially since it doesn't hurt single-user systems at all. Maybe suggest something like this, for admins that want to do something about it:

sudo vigr # change the gid manually
sudo find /var/lib/amule -gid "old-numeric-gid" -exec chgrp amule {} +

I ended up renumbering the brlapi group, too, so I could give the same numeric UID and GID to the amule user/group.