From e6ba79617db4596219a0909091529ea20563d6f7 Mon Sep 17 00:00:00 2001
From: unknown author <cooker@mandrivalinux.org>
Date: Mon, 15 Jun 2009 16:46:10 +0200
Subject: [PATCH] Resume

---
 mkinitrd    |   12 +++++--
 nash/nash.c |  102 ++++++++++++++++++++++++++++++++++++++++++++++------------
 2 files changed, 90 insertions(+), 24 deletions(-)

diff --git a/mkinitrd b/mkinitrd
index e97bcaf..db1f3e6 100755
--- a/mkinitrd
+++ b/mkinitrd
@@ -1668,10 +1668,16 @@ for cryptdev in ${!cryptolv@} ; do
     emitcrypto `eval echo '$'$cryptdev`
 done
 
-if [ -z "$noresume" -a -n "$thawdev" ]; then
-    emit "resume $thawdev"
+if [ -z "$noresume" ]; then
+    if [ -x /usr/sbin/resume ]; then
+	inst /usr/sbin/resume "$MNTIMAGE" /bin/resume
+	if [ -f /etc/suspend.conf ]; then
+            inst /etc/suspend.conf "$MNTIMAGE"
+	fi
+    fi
+    emit "nash-resume"
 fi
-
+  
 if [ -n "$loopfs" ]; then
     emit "echo Mounting loop backing store."
     emit "mkdir /tmpmount"
diff --git a/nash/nash.c b/nash/nash.c
index e127030..3aab14c 100644
--- a/nash/nash.c
+++ b/nash/nash.c
@@ -41,6 +41,7 @@
 #include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>
+#include <limits.h>
 #include <sys/ioctl.h>
 #include <sys/mount.h>
 #include <sys/types.h>
@@ -1544,14 +1545,12 @@ resumeCommand(char * cmd, char * end)
 {
     char * resumedev = NULL;
     char * resume = NULL;
-    int fd, n;
+    int fd;
     struct stat sb;
     char buf[25];
-
-    if (!(cmd = getArg(cmd, end, &resume))) {
-        eprintf("resume: resume device expected\n");
-        return 1;
-    }
+    char uswresume_bin[] = "/bin/resume";
+    char uswconfig[] = "/etc/suspend.conf";
+    char uswresume_key[] = "resume device";
 
     if (access("/sys/power/resume", W_OK)) {
         /* eprintf("/sys/power/resume doesn't exist, can't resume!\n");*/
@@ -1563,27 +1562,88 @@ resumeCommand(char * cmd, char * end)
         return 0;
     }
 
-    resumedev = getKernelArg("resume");
-    if (resumedev == NULL) {
-        resumedev = resume;
-    }
-    n = strcspn(resumedev, " \t\r\n");
-    if (!(resumedev = strndupa(resumedev, n))) {
-        eprintf("Unable to find resume device: %m\n");
-        return 1;
+    resume = getKernelArg("resume");
+    if (resume) {
+	char *chptr = resume, c;
+	while (*chptr && !isspace(*chptr)) chptr++;
+        c = *chptr;
+	*chptr = '\0';
+	resumedev = nashGetPathBySpec(_nash_context, resume);
+        if (resumedev == NULL) {
+            eprintf("Could not resolve resume device (%s)\n", resume);
+        } else if (access(resumedev, R_OK)) {
+            eprintf("Unable to access resume device (%s)\n", resumedev);
+            resumedev = NULL;
+        }
+        *chptr = c;
+    } else {
+        qprintf("No resume device specified\n");
     }
 
-    qprintf("Trying to resume from %s\n", resumedev);
+    do {
+        qprintf("Trying userspace resume from %s\n", resumedev ? resumedev : "suspend.conf file");
 
-    resume = nashGetPathBySpec(_nash_context, resumedev);
-    if (resume)
-        resumedev = resume;
+        if (access(uswresume_bin, X_OK)) {
+            eprintf("No resume binary\n");
+            break;
+        }
 
-    if (access(resumedev, R_OK)) {
-        eprintf("Unable to access resume device (%s)\n", resumedev);
-        return 1;
+        if (smartmknod("/dev/snapshot", S_IFCHR | 0600, makedev(10, 231))) {
+            eprintf("Failed to create /dev/snapshot\n");
+            break;
+        }
+
+        if (!resumedev) {
+               FILE *conf = fopen(uswconfig, "r");
+               char line[256];
+               int has_resume_key = 0;
+               if (!conf < 0)
+                   break;
+               while (fgets(line, sizeof(line), conf)) {
+                   if (!strncmp(line, uswresume_key, strlen(uswresume_key))) {
+        	       char *conf_resumedev = strchr(line, '/');
+        	       if (conf_resumedev) {
+                           char *end = strchr(conf_resumedev, '\n');
+                           if (end) *end = '\0';
+                           if (!access(conf_resumedev, R_OK)) {
+                               has_resume_key = 1;
+                           } else {
+                               eprintf("Unable to access suspend.conf resume device (%s)\n", conf_resumedev);
+                           }
+                       }
+                       break;
+                   }
+               }
+               fclose(conf);
+               if (!has_resume_key) {
+		   qprintf("No resume device in suspend.conf\n");
+                   break;
+               }
+        }
+        if (resumedev) {
+            otherCommand(uswresume_bin, resumedev, resumedev + strlen(resumedev), 1, 0);
+        } else {
+            otherCommand(uswresume_bin, uswresume_bin, NULL, 1, 0);
+        }
+    } while (0);
+
+#define try_suspend2(NAME) \
+    qprintf("Trying " NAME " resume\n"); \
+    fd = open("/sys/power/" NAME "/do_resume", O_WRONLY); \
+    if (fd != -1) { \
+        write(fd, "1", 1); \
+        close(fd); \
+        eprintf("Unable to resume from " NAME ".\n"); \
     }
 
+    try_suspend2("suspend2");
+    try_suspend2("tuxonice");
+
+    if (!resumedev)
+        return 1;
+
+    qprintf("Trying in-kernel resume from %s\n", resumedev);
+
     fd = open(resumedev, O_RDONLY);
     if (fd < 0)
         return 1;
-- 
1.7.1