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From 13c099caa9ae0389423c403152952c3c548fd146 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: Thu, 17 Mar 2022 16:02:10 +0100
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Subject: [PATCH] shared/install: fix handling of a linked unit file
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When we have a symlink that goes outside of our search path, we should just
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ignore the target file name. But we were verifying it, and rejecting in
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the case where a symlink was created manually.
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(cherry picked from commit 48eadb9d9b66f302cda09cdf6d35fead31aaa968)
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Related: #2082131
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---
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src/shared/install.c | 4 +++-
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test/test-systemctl-enable.sh | 12 ++++++++----
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2 files changed, 11 insertions(+), 5 deletions(-)
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diff --git a/src/shared/install.c b/src/shared/install.c
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index b33f7d4bc1..d6951b805d 100644
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--- a/src/shared/install.c
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+++ b/src/shared/install.c
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@@ -1609,7 +1609,9 @@ static int install_info_traverse(
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return -ELOOP;
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}
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- r = install_info_follow(ctx, i, lp, flags, false);
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+ r = install_info_follow(ctx, i, lp, flags,
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+ /* If linked, don't look at the target name */
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+ /* ignore_different_name= */ i->type == UNIT_FILE_TYPE_LINKED);
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if (r == -EXDEV) {
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_cleanup_free_ char *buffer = NULL;
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const char *bn;
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diff --git a/test/test-systemctl-enable.sh b/test/test-systemctl-enable.sh
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index 9463433c5b..45f3513de3 100644
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--- a/test/test-systemctl-enable.sh
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+++ b/test/test-systemctl-enable.sh
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@@ -216,12 +216,16 @@ cat >"$root/link3.suffix" <
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WantedBy=services.target
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EOF
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+# We wouldn't create such a link ourselves, but it should accept it when present.
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ln -s "/link3.suffix" "$root/etc/systemd/system/link3.service"
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-# SYSTEMD_LOG_LEVEL=debug SYSTEMD_LOG_LOCATION=1 "$systemctl" --root="$root" enable 'link3.service'
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-# islink "$root/etc/systemd/system/link3.service" "/link3.suffix"
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-# islink "$root/etc/systemd/system/services.target.wants/link3.service" "../link3.service"
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-# unit_file_load_or_readlink() needs to be fixed to not follow links
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+SYSTEMD_LOG_LEVEL=debug SYSTEMD_LOG_LOCATION=1 "$systemctl" --root="$root" enable 'link3.service'
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+islink "$root/etc/systemd/system/link3.service" "/link3.suffix"
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+islink "$root/etc/systemd/system/services.target.wants/link3.service" "../link3.service"
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+
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+SYSTEMD_LOG_LEVEL=debug SYSTEMD_LOG_LOCATION=1 "$systemctl" --root="$root" disable 'link3.service'
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+test ! -h "$root/etc/systemd/system/link3.service"
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+test ! -h "$root/etc/systemd/system/services.target.wants/link3.service"
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: -------enable on masked-------------------------------------
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ln -s "/dev/null" "$root/etc/systemd/system/masked.service"
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