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177 lines
7.2 KiB
177 lines
7.2 KiB
From 56bc8e8eef5fcbfcf72dd1b3caa56b9186e1011d 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: Fri, 25 Mar 2022 15:43:27 +0100
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Subject: [PATCH] shared/install: when creating symlinks, accept different but
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equivalent symlinks
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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We would only accept "identical" links, but having e.g. a symlink
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/usr/lib/systemd/system/foo-alias.service → /usr/lib/systemd/system/foo.service
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when we're trying to create /usr/lib/systemd/system/foo-alias.service →
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./foo.service is OK. This fixes an issue found in ubuntuautopkg package
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installation, where we'd fail when enabling systemd-resolved.service, because
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the existing alias was absolute, and (with the recent patches) we were trying
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to create a relative one.
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A test is added.
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(For .wants/.requires symlinks we were already doing OK. A test is also
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added, to verify.)
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(cherry picked from commit 3fc53351dc8f37355f5a4ee8f922d3e13a5182c2)
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Related: #2082131
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---
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src/shared/install.c | 59 ++++++++++++++++++++++++++---------
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test/test-systemctl-enable.sh | 39 +++++++++++++++++++++--
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2 files changed, 81 insertions(+), 17 deletions(-)
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diff --git a/src/shared/install.c b/src/shared/install.c
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index d6951b805d..22b16ad453 100644
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--- a/src/shared/install.c
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+++ b/src/shared/install.c
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@@ -423,21 +423,54 @@ void unit_file_dump_changes(int r, const char *verb, const UnitFileChange *chang
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}
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/**
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- * Checks if two paths or symlinks from wd are the same, when root is the root of the filesystem.
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- * wc should be the full path in the host file system.
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+ * Checks if two symlink targets (starting from src) are equivalent as far as the unit enablement logic is
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+ * concerned. If the target is in the unit search path, then anything with the same name is equivalent.
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+ * If outside the unit search path, paths must be identical.
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*/
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-static bool chroot_symlinks_same(const char *root, const char *wd, const char *a, const char *b) {
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- assert(path_is_absolute(wd));
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+static int chroot_unit_symlinks_equivalent(
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+ const LookupPaths *lp,
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+ const char *src,
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+ const char *target_a,
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+ const char *target_b) {
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+
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+ assert(lp);
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+ assert(src);
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+ assert(target_a);
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+ assert(target_b);
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/* This will give incorrect results if the paths are relative and go outside
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* of the chroot. False negatives are possible. */
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- if (!root)
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- root = "/";
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+ const char *root = lp->root_dir ?: "/";
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+ _cleanup_free_ char *dirname = NULL;
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+ int r;
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+
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+ if (!path_is_absolute(target_a) || !path_is_absolute(target_b)) {
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+ r = path_extract_directory(src, &dirname);
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+ if (r < 0)
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+ return r;
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+ }
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- a = strjoina(path_is_absolute(a) ? root : wd, "/", a);
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- b = strjoina(path_is_absolute(b) ? root : wd, "/", b);
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- return path_equal_or_files_same(a, b, 0);
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+ _cleanup_free_ char *a = path_join(path_is_absolute(target_a) ? root : dirname, target_a);
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+ _cleanup_free_ char *b = path_join(path_is_absolute(target_b) ? root : dirname, target_b);
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+ if (!a || !b)
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+ return log_oom();
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+
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+ r = path_equal_or_files_same(a, b, 0);
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+ if (r != 0)
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+ return r;
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+
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+ _cleanup_free_ char *a_name = NULL, *b_name = NULL;
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+ r = path_extract_filename(a, &a_name);
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+ if (r < 0)
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+ return r;
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+ r = path_extract_filename(b, &b_name);
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+ if (r < 0)
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+ return r;
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+
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+ return streq(a_name, b_name) &&
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+ path_startswith_strv(a, lp->search_path) &&
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+ path_startswith_strv(b, lp->search_path);
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}
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static int create_symlink(
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@@ -448,7 +481,7 @@ static int create_symlink(
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UnitFileChange **changes,
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size_t *n_changes) {
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- _cleanup_free_ char *dest = NULL, *dirname = NULL;
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+ _cleanup_free_ char *dest = NULL;
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const char *rp;
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int r;
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@@ -489,11 +522,7 @@ static int create_symlink(
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return r;
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}
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- dirname = dirname_malloc(new_path);
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- if (!dirname)
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- return -ENOMEM;
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-
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- if (chroot_symlinks_same(lp->root_dir, dirname, dest, old_path)) {
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+ if (chroot_unit_symlinks_equivalent(lp, new_path, dest, old_path)) {
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log_debug("Symlink %s → %s already exists", new_path, dest);
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return 1;
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}
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diff --git a/test/test-systemctl-enable.sh b/test/test-systemctl-enable.sh
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index 3b30f090a5..0f66af309a 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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@@ -39,8 +39,29 @@ test -h "$root/etc/systemd/system/default.target.wants/test1.service"
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test -h "$root/etc/systemd/system/special.target.requires/test1.service"
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"$systemctl" --root="$root" disable test1.service
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-test ! -e "$root/etc/systemd/system/default.target.wants/test1.service"
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-test ! -e "$root/etc/systemd/system/special.target.requires/test1.service"
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+test ! -h "$root/etc/systemd/system/default.target.wants/test1.service"
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+test ! -h "$root/etc/systemd/system/special.target.requires/test1.service"
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+
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+: '------enable when link already exists-----------------------'
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+# We don't read the symlink target, so it's OK for the symlink to point
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+# to something else. We should just silently accept this.
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+
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+mkdir -p "$root/etc/systemd/system/default.target.wants"
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+mkdir -p "$root/etc/systemd/system/special.target.requires"
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+ln -s /usr/lib/systemd/system/test1.service "$root/etc/systemd/system/default.target.wants/test1.service"
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+ln -s /usr/lib/systemd/system/test1.service "$root/etc/systemd/system/special.target.requires/test1.service"
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+
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+"$systemctl" --root="$root" enable test1.service
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+test -h "$root/etc/systemd/system/default.target.wants/test1.service"
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+test -h "$root/etc/systemd/system/special.target.requires/test1.service"
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+
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+"$systemctl" --root="$root" reenable test1.service
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+test -h "$root/etc/systemd/system/default.target.wants/test1.service"
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+test -h "$root/etc/systemd/system/special.target.requires/test1.service"
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+
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+"$systemctl" --root="$root" disable test1.service
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+test ! -h "$root/etc/systemd/system/default.target.wants/test1.service"
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+test ! -h "$root/etc/systemd/system/special.target.requires/test1.service"
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: '------suffix guessing---------------------------------------'
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"$systemctl" --root="$root" enable test1
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@@ -90,6 +111,20 @@ test ! -h "$root/etc/systemd/system/default.target.wants/test1.service"
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test ! -h "$root/etc/systemd/system/special.target.requires/test1.service"
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test ! -h "$root/etc/systemd/system/test1-goodalias.service"
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+: '-------aliases when link already exists---------------------'
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+cat >"$root/etc/systemd/system/test1a.service" <<EOF
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+[Install]
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+Alias=test1a-alias.service
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+EOF
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+
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+ln -s /usr/lib/systemd/system/test1a.service "$root/etc/systemd/system/test1a-alias.service"
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+
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+"$systemctl" --root="$root" enable test1a.service
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+test -h "$root/etc/systemd/system/test1a-alias.service"
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+
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+"$systemctl" --root="$root" disable test1a.service
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+test ! -h "$root/etc/systemd/system/test1a-alias.service"
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+
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: '-------also units-------------------------------------------'
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cat >"$root/etc/systemd/system/test2.socket" <<EOF
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[Install]
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