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zipl: Implement zipl helper script for NGDump

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The purpose of the new zipl helper script is to build a dumper initramfs
for NGDump stand-alone dump. zipl executes the helper script when
preparing a NVMe dump partition for stand-alone dump.

The zipl helper script expects a single parameter - a path to the dump
partition to store a dump on. The helper script terminates with 0 on
success and a positive value otherwise.

The zipl helper script performs the following steps:
- It builds an initramfs image suitable for dumping. To perform this step,
  the script employs the dracut tool on Fedora/RHEL/SLES and
  the initramfs-tools on Ubuntu/Debian.
- It outputs the path to the newly built initramfs image and the currently
  active kernel bzImage on the standard output.
- It prints the kernel command-line to be used by the dumper on
  the standard output.

On success, zipl expects the helper script to return at least three lines
containing:
- initrd=<path to an initramfs image>
- kernel=<path to a kernel bzImage>
- cmdline=<kernel command-line parameters>

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Tested-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Alexander Egorenkov
2021-08-12 13:23:46 +02:00
committed by Jan Höppner
parent c1d08e1380
commit b4142a9966
6 changed files with 257 additions and 0 deletions
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zipl/src/job.c
+86
View File
@@ -896,6 +896,92 @@ check_job_dump_images(struct job_dump_data* dump, char* name)
}
int
check_job_images_ngdump(struct job_dump_data* dump, char *name)
{
const char *helper = TOOLS_LIBDIR "/zipl_helper.prepare-ngdump";
char *ppn_cmd = NULL;
char *line = NULL;
FILE *fp;
int rc;
misc_asprintf(&ppn_cmd, "%s %s", helper, dump->device);
printf("Run %s\n", ppn_cmd);
fp = popen(ppn_cmd, "r");
if (fp == NULL) {
error_reason("Failed to run popen(%s,\"r\",)");
free(ppn_cmd);
return -1;
}
free(ppn_cmd);
while (fscanf(fp, "%m[^\n]\n", &line) != EOF) {
char *param = NULL;
char *value = NULL;
int n = sscanf(line, "%m[^=]=%m[^\n]\n", &param, &value);
if (n != 2) {
if (verbose)
printf("%s\n", line);
free(line);
free(param);
free(value);
continue;
}
if (strcmp(param, "kernel") == 0) {
dump->common.image = value;
value = NULL;
} else if (strcmp(param, "initrd") == 0) {
dump->common.ramdisk = value;
value = NULL;
} else if (strcmp(param, "cmdline") == 0) {
dump->common.parmline = value;
value = NULL;
} else {
printf("%s\n", line);
}
free(line);
free(param);
free(value);
}
switch (pclose(fp)) {
case 0:
/* success */
break;
case -1:
error_reason("Failed to run pclose");
return -1;
default:
error_reason("Script could not determine dump parameters");
return -1;
}
rc = misc_check_readable_file(dump->common.image);
if (rc) {
error_text("Need external file '%s' for dump",
dump->common.image);
return rc;
}
dump->common.image_addr = IMAGE_LOAD_ADDRESS;
rc = misc_check_readable_file(dump->common.ramdisk);
if (rc) {
error_text("Need external file '%s' for dump",
dump->common.ramdisk);
return rc;
}
dump->common.ramdisk_addr = UNSPECIFIED_ADDRESS;
dump->common.parm_addr = UNSPECIFIED_ADDRESS;
return finalize_common_address_data(&dump->common, name);
}
static int
check_job_menu_data(struct job_menu_data *menu, struct job_envblk_data *envblk)
{