87 lines
3.6 KiB
Diff
87 lines
3.6 KiB
Diff
From 35b8a55c85aa69af9634af337085da777d438bea Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Sat, 13 Aug 2016 01:20:29 -0400
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Subject: [PATCH] shared/install: ignore unit symlinks when doing preset-all
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Before, when interating over unit files during preset-all, behaviour was the
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following:
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- if we hit the real unit name first, presets were queried for that name, and
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that unit was enabled or disabled accordingly,
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- if we hit an alias first (one of the symlinks chaining to the real unit), we
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checked the presets using the symlink name, and then proceeded to enable or
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disable the real unit.
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E.g. for systemd-networkd.service we have the alias dbus-org.freedesktop.network1.service
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(/usr/lib/systemd/system/dbus-org.freedesktop.network1.service), but the preset
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is only for the systemd-networkd.service name. The service would be enabled or
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disabled pseudorandomly depending on the order of iteration.
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For "preset", behaviour was analogous: preset on the alias name disabled the
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service (following the default disable policy), preset on the "real" name
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applied the presets.
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With the patch, for "preset" and "preset-all" we silently skip symlinks. This
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gives mostly the right behaviour, with the limitation that presets on aliases
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are ignored. I think that presets on aliases are not that common (at least my
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preset files on Fedora don't exhibit any such usage), and should not be
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necessary, since whoever installs the preset can just refer to the real unit
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file. It would be possible to overcome this limitation by gathering a list of
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names of a unit first, and then checking whether *any* of the names matches the
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presets list. That would require a significant redesign of the code, and be
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a lot slower (since we would have to fully read all unit directories to preset
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one unit) to so I'm not doing that for now.
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With this patch, two properties are satisfied:
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- preset-all and preset are idempotent, and the second and subsequent invocations
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do not produce any changes,
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- preset-all and preset for a specific name produce the same state for that unit.
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Fixes #3616.
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(cherry picked from commit 11e11fd57a837ea1cb142009c3048882392f3ed3)
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---
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src/shared/install.c | 13 ++++++++++---
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1 file changed, 10 insertions(+), 3 deletions(-)
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diff --git a/src/shared/install.c b/src/shared/install.c
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index 5e0f9c5d0c..ef5a56391c 100644
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--- a/src/shared/install.c
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+++ b/src/shared/install.c
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@@ -1974,7 +1974,6 @@ int unit_file_revert(
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unsigned *n_changes) {
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_cleanup_set_free_free_ Set *remove_symlinks_to = NULL;
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- /* _cleanup_(install_context_done) InstallContext c = {}; */
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_cleanup_lookup_paths_free_ LookupPaths paths = {};
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_cleanup_strv_free_ char **todo = NULL;
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size_t n_todo = 0, n_allocated = 0;
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@@ -2697,13 +2696,21 @@ static int preset_prepare_one(
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UnitFileChange **changes,
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unsigned *n_changes) {
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+ _cleanup_(install_context_done) InstallContext tmp = {};
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UnitFileInstallInfo *i;
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int r;
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- if (install_info_find(plus, name) ||
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- install_info_find(minus, name))
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+ if (install_info_find(plus, name) || install_info_find(minus, name))
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return 0;
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+ r = install_info_discover(scope, &tmp, paths, name, SEARCH_FOLLOW_CONFIG_SYMLINKS, &i);
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+ if (r < 0)
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+ return r;
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+ if (!streq(name, i->name)) {
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+ log_debug("Skipping %s because is an alias for %s", name, i->name);
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+ return 0;
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+ }
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+
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r = query_presets(name, presets);
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if (r < 0)
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return r;
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--
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2.9.0
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