mirror of
https://github.com/systemd/systemd.git
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e8630e6952
This reworks how we load units from disk. Instead of chasing symlinks every
time we are asked to load a unit by name, we slurp all symlinks from disk
and build two hashmaps:
1. from unit name to either alias target, or fragment on disk
(if an alias, we put just the target name in the hashmap, if a fragment
we put an absolute path, so we can distinguish both).
2. from a unit name to all aliases
Reading all this data can be pretty costly (40 ms) on my machine, so we keep it
around for reuse.
The advantage is that we can reliably know what all the aliases of a given unit
are. This means we can reliably load dropins under all names. This fixes #11972.
415 lines
15 KiB
Bash
Executable File
415 lines
15 KiB
Bash
Executable File
#! /bin/bash
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set -e
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set -x
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_clear_service () {
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systemctl stop $1.service 2>/dev/null || :
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rm -f /{etc,run,usr/lib}/systemd/system/$1.service
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rm -fr /{etc,run,usr/lib}/systemd/system/$1.service.d
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rm -fr /{etc,run,usr/lib}/systemd/system/$1.service.{wants,requires}
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}
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clear_services () {
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for u in $*; do
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_clear_service $u
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done
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systemctl daemon-reload
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}
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create_service () {
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clear_services $1
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cat >/etc/systemd/system/$1.service<<EOF
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[Unit]
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Description=$1 unit
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[Service]
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ExecStart=/bin/sleep 100000
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EOF
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mkdir -p /{etc,run,usr/lib}/systemd/system/$1.service.d
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mkdir -p /etc/systemd/system/$1.service.{wants,requires}
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mkdir -p /run/systemd/system/$1.service.{wants,requires}
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mkdir -p /usr/lib/systemd/system/$1.service.{wants,requires}
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}
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create_services () {
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for u in $*; do
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create_service $u
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done
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}
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check_ok () {
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[ $# -eq 3 ] || return
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x="$(systemctl show --value -p $2 $1)"
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case "$x" in
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*$3*) return 0 ;;
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*) return 1 ;;
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esac
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}
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check_ko () {
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! check_ok "$@"
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}
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test_basic_dropins () {
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echo "Testing basic dropins..."
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echo "*** test a wants b wants c"
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create_services a b c
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ln -s ../b.service /etc/systemd/system/a.service.wants/
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ln -s ../c.service /etc/systemd/system/b.service.wants/
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check_ok a Wants b.service
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check_ok b Wants c.service
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echo "*** test a wants,requires b"
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create_services a b c
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ln -s ../b.service /etc/systemd/system/a.service.wants/
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ln -s ../b.service /etc/systemd/system/a.service.requires/
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check_ok a Wants b.service
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check_ok a Requires b.service
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echo "*** test a wants nonexistent"
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create_service a
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ln -s ../nonexistent.service /etc/systemd/system/a.service.wants/
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check_ok a Wants nonexistent.service
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systemctl start a
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systemctl stop a
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echo "*** test a requires nonexistent"
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ln -sf ../nonexistent.service /etc/systemd/system/a.service.requires/
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systemctl daemon-reload
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check_ok a Requires nonexistent.service
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# 'b' is already loaded when 'c' pulls it in via a dropin.
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echo "*** test a,c require b"
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create_services a b c
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ln -sf ../b.service /etc/systemd/system/a.service.requires/
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ln -sf ../b.service /etc/systemd/system/c.service.requires/
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systemctl start a
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check_ok c Requires b.service
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systemctl stop a b
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# 'b' is already loaded when 'c' pulls it in via an alias dropin.
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echo "*** test a wants alias"
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create_services a b c
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ln -sf c.service /etc/systemd/system/c1.service
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ln -sf ../c.service /etc/systemd/system/a.service.wants/
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ln -sf ../c1.service /etc/systemd/system/b.service.wants/
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systemctl start a
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check_ok a Wants c.service
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check_ok b Wants c.service
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systemctl stop a c
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clear_services a b c
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}
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test_template_dropins () {
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echo "Testing template dropins..."
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create_services foo bar@ yup@
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# Declare some deps to check if the body was loaded
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cat >>/etc/systemd/system/bar@.service <<EOF
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[Unit]
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After=bar-template-after.device
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EOF
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cat >>/etc/systemd/system/yup@.service <<EOF
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[Unit]
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After=yup-template-after.device
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EOF
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ln -s /etc/systemd/system/bar@.service /etc/systemd/system/foo.service.wants/bar@1.service
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check_ok foo Wants bar@1.service
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echo "*** test bar-alias@.service→bar@.service, but instance symlinks point to yup@.service ***"
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ln -s bar@.service /etc/systemd/system/bar-alias@.service
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ln -s bar@1.service /etc/systemd/system/bar-alias@1.service
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ln -s yup@.service /etc/systemd/system/bar-alias@2.service
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ln -s yup@3.service /etc/systemd/system/bar-alias@3.service
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# create some dropin deps
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mkdir -p /etc/systemd/system/bar@{,0,1,2,3}.service.requires/
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mkdir -p /etc/systemd/system/yup@{,0,1,2,3}.service.requires/
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mkdir -p /etc/systemd/system/bar-alias@{,0,1,2,3}.service.requires/
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ln -s ../bar-template-requires.device /etc/systemd/system/bar@.service.requires/
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ln -s ../bar-0-requires.device /etc/systemd/system/bar@0.service.requires/
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ln -s ../bar-1-requires.device /etc/systemd/system/bar@1.service.requires/
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ln -s ../bar-2-requires.device /etc/systemd/system/bar@2.service.requires/
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ln -s ../bar-3-requires.device /etc/systemd/system/bar@3.service.requires/
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ln -s ../yup-template-requires.device /etc/systemd/system/yup@.service.requires/
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ln -s ../yup-0-requires.device /etc/systemd/system/yup@0.service.requires/
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ln -s ../yup-1-requires.device /etc/systemd/system/yup@1.service.requires/
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ln -s ../yup-2-requires.device /etc/systemd/system/yup@2.service.requires/
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ln -s ../yup-3-requires.device /etc/systemd/system/yup@3.service.requires/
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ln -s ../bar-alias-template-requires.device /etc/systemd/system/bar-alias@.service.requires/
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ln -s ../bar-alias-0-requires.device /etc/systemd/system/bar-alias@0.service.requires/
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ln -s ../bar-alias-1-requires.device /etc/systemd/system/bar-alias@1.service.requires/
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ln -s ../bar-alias-2-requires.device /etc/systemd/system/bar-alias@2.service.requires/
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ln -s ../bar-alias-3-requires.device /etc/systemd/system/bar-alias@3.service.requires/
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systemctl daemon-reload
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echo '*** bar@0 is aliased by bar-alias@0 ***'
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systemctl show -p Names,Requires bar@0
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systemctl show -p Names,Requires bar-alias@0
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check_ok bar@0 Names bar@0
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check_ok bar@0 Names bar-alias@0
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check_ok bar@0 After bar-template-after.device
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check_ok bar@0 Requires bar-0-requires.device
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check_ok bar@0 Requires bar-alias-0-requires.device
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check_ok bar@0 Requires bar-template-requires.device
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check_ok bar@0 Requires bar-alias-template-requires.device
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check_ko bar@0 Requires yup-template-requires.device
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check_ok bar-alias@0 After bar-template-after.device
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check_ok bar-alias@0 Requires bar-0-requires.device
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check_ok bar-alias@0 Requires bar-alias-0-requires.device
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check_ok bar-alias@0 Requires bar-template-requires.device
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check_ok bar-alias@0 Requires bar-alias-template-requires.device
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check_ko bar-alias@0 Requires yup-template-requires.device
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check_ko bar-alias@0 Requires yup-0-requires.device
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echo '*** bar@1 is aliased by bar-alias@1 ***'
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systemctl show -p Names,Requires bar@1
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systemctl show -p Names,Requires bar-alias@1
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check_ok bar@1 Names bar@1
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check_ok bar@1 Names bar-alias@1
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check_ok bar@1 After bar-template-after.device
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check_ok bar@1 Requires bar-1-requires.device
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check_ok bar@1 Requires bar-alias-1-requires.device
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check_ok bar@1 Requires bar-template-requires.device
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# See https://github.com/systemd/systemd/pull/13119#discussion_r308145418
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check_ok bar@1 Requires bar-alias-template-requires.device
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check_ko bar@1 Requires yup-template-requires.device
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check_ko bar@1 Requires yup-1-requires.device
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check_ok bar-alias@1 After bar-template-after.device
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check_ok bar-alias@1 Requires bar-1-requires.device
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check_ok bar-alias@1 Requires bar-alias-1-requires.device
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check_ok bar-alias@1 Requires bar-template-requires.device
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check_ok bar-alias@1 Requires bar-alias-template-requires.device
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check_ko bar-alias@1 Requires yup-template-requires.device
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check_ko bar-alias@1 Requires yup-1-requires.device
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echo '*** bar-alias@2 aliases yup@2, bar@2 is independent ***'
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systemctl show -p Names,Requires bar@2
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systemctl show -p Names,Requires bar-alias@2
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check_ok bar@2 Names bar@2
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check_ko bar@2 Names bar-alias@2
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check_ok bar@2 After bar-template-after.device
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check_ok bar@2 Requires bar-2-requires.device
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check_ko bar@2 Requires bar-alias-2-requires.device
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check_ok bar@2 Requires bar-template-requires.device
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check_ko bar@2 Requires bar-alias-template-requires.device
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check_ko bar@2 Requires yup-template-requires.device
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check_ko bar@2 Requires yup-2-requires.device
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check_ko bar-alias@2 After bar-template-after.device
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check_ko bar-alias@2 Requires bar-2-requires.device
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check_ok bar-alias@2 Requires bar-alias-2-requires.device
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check_ko bar-alias@2 Requires bar-template-requires.device
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check_ok bar-alias@2 Requires bar-alias-template-requires.device
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check_ok bar-alias@2 Requires yup-template-requires.device
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check_ok bar-alias@2 Requires yup-2-requires.device
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echo '*** bar-alias@3 aliases yup@3, bar@3 is independent ***'
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systemctl show -p Names,Requires bar@3
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systemctl show -p Names,Requires bar-alias@3
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check_ok bar@3 Names bar@3
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check_ko bar@3 Names bar-alias@3
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check_ok bar@3 After bar-template-after.device
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check_ok bar@3 Requires bar-3-requires.device
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check_ko bar@3 Requires bar-alias-3-requires.device
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check_ok bar@3 Requires bar-template-requires.device
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check_ko bar@3 Requires bar-alias-template-requires.device
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check_ko bar@3 Requires yup-template-requires.device
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check_ko bar@3 Requires yup-3-requires.device
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check_ko bar-alias@3 After bar-template-after.device
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check_ko bar-alias@3 Requires bar-3-requires.device
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check_ok bar-alias@3 Requires bar-alias-3-requires.device
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check_ko bar-alias@3 Requires bar-template-requires.device
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check_ok bar-alias@3 Requires bar-alias-template-requires.device
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check_ok bar-alias@3 Requires yup-template-requires.device
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check_ok bar-alias@3 Requires yup-3-requires.device
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clear_services foo {bar,yup,bar-alias}@{,1,2,3}
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}
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test_alias_dropins () {
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echo "Testing alias dropins..."
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echo "*** test a wants b1 alias of b"
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create_services a b
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ln -sf b.service /etc/systemd/system/b1.service
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ln -sf ../b1.service /etc/systemd/system/a.service.wants/
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check_ok a Wants b.service
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systemctl start a
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systemctl --quiet is-active b
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systemctl stop a b
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rm /etc/systemd/system/b1.service
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clear_services a b
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# Check that dependencies don't vary.
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echo "*** test 2"
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create_services a x y
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mkdir -p /etc/systemd/system/a1.service.wants/
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ln -sf a.service /etc/systemd/system/a1.service
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ln -sf ../x.service /etc/systemd/system/a.service.wants/
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ln -sf ../y.service /etc/systemd/system/a1.service.wants/
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check_ok a1 Wants x.service # see [1]
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check_ok a1 Wants y.service
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systemctl start a
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check_ok a1 Wants x.service # see [2]
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check_ok a1 Wants y.service
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systemctl stop a x y
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rm /etc/systemd/system/a1.service
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clear_services a x y
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}
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test_masked_dropins () {
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echo "Testing masked dropins..."
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create_services a b
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# 'b' is masked for both deps
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echo "*** test a wants,requires b is masked"
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ln -sf /dev/null /etc/systemd/system/a.service.wants/b.service
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ln -sf /dev/null /etc/systemd/system/a.service.requires/b.service
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check_ko a Wants b.service
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check_ko a Requires b.service
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# 'a' wants 'b' and 'b' is masked at a lower level
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echo "*** test a wants b, mask override"
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ln -sf ../b.service /etc/systemd/system/a.service.wants/b.service
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ln -sf /dev/null /usr/lib/systemd/system/a.service.wants/b.service
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check_ok a Wants b.service
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# 'a' wants 'b' and 'b' is masked at a higher level
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echo "*** test a wants b, mask"
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ln -sf /dev/null /etc/systemd/system/a.service.wants/b.service
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ln -sf ../b.service /usr/lib/systemd/system/a.service.wants/b.service
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check_ko a Wants b.service
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# 'a' is masked but has an override config file
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echo "*** test a is masked but has an override"
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create_services a b
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ln -sf /dev/null /etc/systemd/system/a.service
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cat >/usr/lib/systemd/system/a.service.d/override.conf <<EOF
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[Unit]
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After=b.service
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EOF
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check_ok a UnitFileState masked
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# 'b1' is an alias for 'b': masking 'b' dep should not influence 'b1' dep
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echo "*** test a wants b, b1, and one is masked"
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create_services a b
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ln -sf b.service /etc/systemd/system/b1.service
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ln -sf /dev/null /etc/systemd/system/a.service.wants/b.service
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ln -sf ../b1.service /usr/lib/systemd/system/a.service.wants/b1.service
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systemctl cat a
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systemctl show -p Wants,Requires a
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systemctl cat b1
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systemctl show -p Wants,Requires b1
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check_ok a Wants b.service
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check_ko a Wants b1.service # the alias does not show up in the list of units
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rm /etc/systemd/system/b1.service
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# 'b1' is an alias for 'b': masking 'b1' should not influence 'b' dep
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echo "*** test a wants b, alias dep is masked"
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create_services a b
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ln -sf b.service /etc/systemd/system/b1.service
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ln -sf /dev/null /etc/systemd/system/a.service.wants/b1.service
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ln -sf ../b.service /usr/lib/systemd/system/a.service.wants/b.service
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check_ok a Wants b.service
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check_ko a Wants b1.service # the alias does not show up in the list of units
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rm /etc/systemd/system/b1.service
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# 'a' has Wants=b.service but also has a masking
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# dropin 'b': 'b' should still be pulled in.
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echo "*** test a wants b both ways"
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create_services a b
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ln -sf /dev/null /etc/systemd/system/a.service.wants/b.service
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cat >/usr/lib/systemd/system/a.service.d/wants-b.conf<<EOF
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[Unit]
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Wants=b.service
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EOF
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check_ok a Wants b.service
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# mask a dropin that points to an nonexistent unit.
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echo "*** test a wants nonexistent is masked"
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create_services a
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ln -sf /dev/null /etc/systemd/system/a.service.requires/nonexistent.service
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ln -sf ../nonexistent.service /usr/lib/systemd/system/a.service.requires/
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check_ko a Requires nonexistent.service
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# 'b' is already loaded when 'c' pulls it in via a dropin but 'b' is
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# masked at a higher level.
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echo "*** test a wants b is masked"
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create_services a b c
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ln -sf ../b.service /etc/systemd/system/a.service.requires/
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ln -sf ../b.service /run/systemd/system/c.service.requires/
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ln -sf /dev/null /etc/systemd/system/c.service.requires/b.service
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systemctl start a
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check_ko c Requires b.service
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systemctl stop a b
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# 'b' is already loaded when 'c' pulls it in via a dropin but 'b' is
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# masked at a lower level.
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echo "*** test a requires b is masked"
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create_services a b c
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ln -sf ../b.service /etc/systemd/system/a.service.requires/
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ln -sf ../b.service /etc/systemd/system/c.service.requires/
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ln -sf /dev/null /run/systemd/system/c.service.requires/b.service
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systemctl start a
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check_ok c Requires b.service
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systemctl stop a b
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# 'a' requires 2 aliases of 'b' and one of them is a mask.
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echo "*** test a requires alias of b, other alias masked"
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create_services a b
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ln -sf b.service /etc/systemd/system/b1.service
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ln -sf b.service /etc/systemd/system/b2.service
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ln -sf /dev/null /etc/systemd/system/a.service.requires/b1.service
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ln -sf ../b1.service /run/systemd/system/a.service.requires/
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ln -sf ../b2.service /usr/lib/systemd/system/a.service.requires/
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check_ok a Requires b
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# Same as above but now 'b' is masked.
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echo "*** test a requires alias of b, b dep masked"
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create_services a b
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ln -sf b.service /etc/systemd/system/b1.service
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ln -sf b.service /etc/systemd/system/b2.service
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ln -sf ../b1.service /run/systemd/system/a.service.requires/
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ln -sf ../b2.service /usr/lib/systemd/system/a.service.requires/
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ln -sf /dev/null /etc/systemd/system/a.service.requires/b.service
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check_ok a Requires b
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clear_services a b
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}
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test_basic_dropins
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test_template_dropins
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test_alias_dropins
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test_masked_dropins
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touch /testok
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