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From cad8ec5980d63253586d9f884649c45eed0667a1 Mon Sep 17 00:00:00 2001
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From: Harald Hoyer <harald@redhat.com>
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Date: Thu, 6 Mar 2014 16:35:02 +0100
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Subject: [PATCH] systemctl: for switch-root check, if we switch to a systemd
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init
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If "systemctl switch-root" is called with a specific "INIT" or
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/proc/cmdline contains "init=", then systemd would not serialize
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itsself.
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Let systemctl check, if the new init is in the standard systemd
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installation path and if so, clear the INIT parameter,
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to let systemd serialize itsself.
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Conflicts:
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src/systemctl/systemctl.c
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(cherry picked from commit f39d4a08e746e703d562076a0f622eb91dbdcd3e)
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Related: #1111199
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---
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src/shared/util.h | 13 +++++++++++++
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src/systemctl/systemctl.c | 35 ++++++++++++++++++++++++++---------
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2 files changed, 39 insertions(+), 9 deletions(-)
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diff --git a/src/shared/util.h b/src/shared/util.h
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index 631a385..d11fa07 100644
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--- a/src/shared/util.h
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+++ b/src/shared/util.h
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@@ -726,6 +726,19 @@ int unlink_noerrno(const char *path);
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_c_; \
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})
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+#define strappenda3(a, b, c) \
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+ ({ \
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+ const char *_a_ = (a), *_b_ = (b), *_c_ = (c); \
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+ char *_d_; \
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+ size_t _x_, _y_, _z_; \
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+ _x_ = strlen(_a_); \
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+ _y_ = strlen(_b_); \
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+ _z_ = strlen(_c_); \
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+ _d_ = alloca(_x_ + _y_ + _z_ + 1); \
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+ strcpy(stpcpy(stpcpy(_d_, _a_), _b_), _c_); \
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+ _d_; \
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+ })
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+
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#define procfs_file_alloca(pid, field) \
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({ \
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pid_t _pid_ = (pid); \
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diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
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index c738daf..1ca4fd3 100644
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--- a/src/systemctl/systemctl.c
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+++ b/src/systemctl/systemctl.c
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@@ -4143,9 +4143,10 @@ static int show_enviroment(DBusConnection *bus, char **args) {
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}
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static int switch_root(DBusConnection *bus, char **args) {
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+ _cleanup_free_ char *cmdline_init = NULL;
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+ const char *root, *init;
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unsigned l;
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- const char *root;
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- _cleanup_free_ char *init = NULL;
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+ int r;
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l = strv_length(args);
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if (l < 2 || l > 3) {
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@@ -4156,19 +4157,35 @@ static int switch_root(DBusConnection *bus, char **args) {
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root = args[1];
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if (l >= 3)
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- init = strdup(args[2]);
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+ init = args[2];
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else {
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- parse_env_file("/proc/cmdline", WHITESPACE,
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- "init", &init,
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- NULL);
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+ r = parse_env_file("/proc/cmdline", WHITESPACE,
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+ "init", &cmdline_init,
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+ NULL);
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+ if (r < 0)
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+ log_debug("Failed to parse /proc/cmdline: %s", strerror(-r));
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- if (!init)
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- init = strdup("");
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+ init = cmdline_init;
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}
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if (!init)
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return log_oom();
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- log_debug("switching root - root: %s; init: %s", root, init);
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+ if (isempty(init))
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+ init = NULL;
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+
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+ if (init) {
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+ const char *root_systemd_path = NULL, *root_init_path = NULL;
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+
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+ root_systemd_path = strappenda(root, "/" SYSTEMD_BINARY_PATH);
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+ root_init_path = strappenda3(root, "/", init);
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+
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+ /* If the passed init is actually the same as the
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+ * systemd binary, then let's suppress it. */
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+ if (files_same(root_init_path, root_systemd_path) > 0)
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+ init = NULL;
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+ }
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+
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+ log_debug("Switching root - root: %s; init: %s", root, strna(init));
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return bus_method_call_with_reply(
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bus,
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