From 298c601d889adf835b1dd4be4702ff2c6f8f70b6 Mon Sep 17 00:00:00 2001
From: Jonathan Lebon <jonathan@jlebon.com>
Date: Tue, 25 Sep 2018 15:42:28 -0400
Subject: [PATCH] ostree-prepare-root: Log journal message after finding
 deployment

Log a structured journal message when resolving the deployment path.
This will be used by the `rpm-ostree history` command to find past
deployments the system has booted into.

Closes: #1842
Approved by: cgwalters
---
 Makefile-switchroot.am               |  5 +++++
 src/switchroot/ostree-prepare-root.c | 19 +++++++++++++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/Makefile-switchroot.am b/Makefile-switchroot.am
index 4423fdcd..586a8cd5 100644
--- a/Makefile-switchroot.am
+++ b/Makefile-switchroot.am
@@ -57,6 +57,11 @@ ostree_remount_SOURCES = \
     $(NULL)
 ostree_remount_CPPFLAGS = $(AM_CPPFLAGS) -Isrc/switchroot
 
+if BUILDOPT_SYSTEMD
+ostree_prepare_root_CPPFLAGS += -DHAVE_SYSTEMD=1
+ostree_prepare_root_LDADD = $(AM_LDFLAGS) $(LIBSYSTEMD_LIBS)
+endif
+
 # This is the "new mode" of using a generator for /var; see
 # https://github.com/ostreedev/ostree/issues/855
 if BUILDOPT_SYSTEMD_AND_LIBMOUNT
diff --git a/src/switchroot/ostree-prepare-root.c b/src/switchroot/ostree-prepare-root.c
index 01a85569..c4208750 100644
--- a/src/switchroot/ostree-prepare-root.c
+++ b/src/switchroot/ostree-prepare-root.c
@@ -47,6 +47,11 @@
 #include <errno.h>
 #include <ctype.h>
 
+#ifdef HAVE_LIBSYSTEMD
+#include <systemd/sd-journal.h>
+#define OSTREE_PREPARE_ROOT_DEPLOYMENT_MSG SD_ID128_MAKE(71,70,33,6a,73,ba,46,01,ba,d3,1a,f8,88,aa,0d,f7)
+#endif
+
 #include "ostree-mount-util.h"
 
 /* Initialized early in main */
@@ -71,9 +76,19 @@ resolve_deploy_path (const char * root_mountpoint)
   deploy_path = realpath (destpath, NULL);
   if (deploy_path == NULL)
     err (EXIT_FAILURE, "realpath(%s) failed", destpath);
+  if (stat (deploy_path, &stbuf) < 0)
+    err (EXIT_FAILURE, "stat(%s) failed", deploy_path);
   /* Quiet logs if there's no journal */
-  if (!running_as_pid1)
-    printf ("Resolved OSTree target to: %s\n", deploy_path);
+#ifdef HAVE_LIBSYSTEMD
+  const char *resolved_path = deploy_path + strlen (root_mountpoint);
+  sd_journal_send ("MESSAGE=Resolved OSTree target to: %s", deploy_path,
+                   "MESSAGE_ID=" SD_ID128_FORMAT_STR,
+                   SD_ID128_FORMAT_VAL(OSTREE_PREPARE_ROOT_DEPLOYMENT_MSG),
+                   "DEPLOYMENT_PATH=%s", resolved_path,
+                   "DEPLOYMENT_DEVICE=%u", stbuf.st_dev,
+                   "DEPLOYMENT_INODE=%u", stbuf.st_ino,
+                   NULL);
+#endif
   return deploy_path;
 }