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diff --git a/daemons/execd/remoted_schemas.c b/daemons/execd/remoted_schemas.c
index 2cb8f323bc..f0ec068369 100644
--- a/daemons/execd/remoted_schemas.c
+++ b/daemons/execd/remoted_schemas.c
@@ -1,285 +1,286 @@
/*
* Copyright 2023-2024 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#include <crm_internal.h>
#include <ftw.h>
#include <unistd.h>
#include <sys/stat.h>
#include <crm/cib.h>
#include <crm/cib/cib_types.h>
#include <crm/cib/internal.h>
#include <crm/crm.h>
#include <crm/common/mainloop.h>
#include <crm/common/xml.h>
#include "pacemaker-execd.h"
static pid_t schema_fetch_pid = 0;
static int
rm_files(const char *pathname, const struct stat *sbuf, int type, struct FTW *ftwb)
{
/* Don't delete PCMK__REMOTE_SCHEMA_DIR . */
if (ftwb->level == 0) {
return 0;
}
if (remove(pathname) != 0) {
int rc = errno;
crm_err("Could not remove %s: %s", pathname, pcmk_rc_str(rc));
return -1;
}
return 0;
}
static void
clean_up_extra_schema_files(void)
{
const char *remote_schema_dir = pcmk__remote_schema_dir();
struct stat sb;
int rc;
rc = stat(remote_schema_dir, &sb);
if (rc == -1) {
if (errno == ENOENT) {
/* If the directory doesn't exist, try to make it first. */
if (mkdir(remote_schema_dir, 0755) != 0) {
rc = errno;
crm_err("Could not create directory for schemas: %s",
pcmk_rc_str(rc));
}
} else {
rc = errno;
crm_err("Could not create directory for schemas: %s",
pcmk_rc_str(rc));
}
} else if (!S_ISDIR(sb.st_mode)) {
/* If something exists with the same name that's not a directory, that's
* an error.
*/
crm_err("%s already exists but is not a directory", remote_schema_dir);
} else {
/* It's a directory - clear it out so we can download potentially new
* schema files.
*/
rc = nftw(remote_schema_dir, rm_files, 10, FTW_DEPTH|FTW_MOUNT|FTW_PHYS);
if (rc != 0) {
crm_err("Could not remove %s: %s", remote_schema_dir, pcmk_rc_str(rc));
}
}
}
static void
write_extra_schema_file(xmlNode *xml, void *user_data)
{
const char *remote_schema_dir = pcmk__remote_schema_dir();
const char *file = NULL;
char *path = NULL;
int rc;
file = crm_element_value(xml, PCMK_XA_PATH);
if (file == NULL) {
crm_warn("No destination path given in schema request");
return;
}
path = crm_strdup_printf("%s/%s", remote_schema_dir, file);
/* The schema is a CDATA node, which is a child of the <file> node. Traverse
* all children and look for the first CDATA child. There can't be more than
* one because we only have one file attribute on the parent.
*/
for (xmlNode *child = xml->children; child != NULL; child = child->next) {
FILE *stream = NULL;
if (child->type != XML_CDATA_SECTION_NODE) {
continue;
}
stream = fopen(path, "w+");
if (stream == NULL) {
crm_warn("Could not write schema file %s: %s", path, strerror(errno));
} else {
rc = fprintf(stream, "%s", child->content);
if (rc < 0) {
crm_warn("Could not write schema file %s: %s", path, strerror(errno));
}
fclose(stream);
}
break;
}
free(path);
}
static void
get_schema_files(void)
{
int rc = pcmk_rc_ok;
cib_t *cib = NULL;
xmlNode *reply;
cib = cib_new();
if (cib == NULL) {
_exit(ENOTCONN);
}
rc = cib->cmds->signon(cib, crm_system_name, cib_query);
if (rc != pcmk_ok) {
crm_err("Could not connect to the CIB manager: %s", pcmk_strerror(rc));
_exit(pcmk_rc2exitc(rc));
}
rc = cib->cmds->fetch_schemas(cib, &reply, pcmk__highest_schema_name(),
cib_sync_call);
if (rc != pcmk_ok) {
crm_err("Could not get schema files: %s", pcmk_strerror(rc));
rc = pcmk_legacy2rc(rc);
} else if (reply->children != NULL) {
/* The returned document looks something like this:
* <cib_command>
* <cib_calldata>
* <schemas>
* <schema version="pacemaker-1.1">
* <file path="foo-1.1">
* </file>
* <file path="bar-1.1">
* </file>
* ...
* </schema>
* <schema version="pacemaker-1.2">
* </schema>
* ...
* </schemas>
* </cib_calldata>
* </cib_command>
*
* All the <schemas> and <schema> tags are really just there for organizing
* the XML a little better. What we really care about are the <file> nodes,
* and specifically the path attributes and the CDATA children (not shown)
* of each. We can use an xpath query to reach down and get all the <file>
* nodes at once.
*
* If we already have the latest schema version, or we asked for one later
* than what the cluster supports, we'll get back an empty <schemas> node,
* so all this will continue to work. It just won't do anything.
*/
crm_foreach_xpath_result(reply, "//" PCMK_XA_FILE,
write_extra_schema_file, NULL);
}
+ free_xml(reply);
cib__clean_up_connection(&cib);
_exit(pcmk_rc2exitc(rc));
}
/* Load any additional schema files when the child is finished fetching and
* saving them to disk.
*/
static void
get_schema_files_complete(mainloop_child_t *p, pid_t pid, int core, int signo, int exitcode)
{
const char *errmsg = "Could not load additional schema files";
if ((signo == 0) && (exitcode == 0)) {
const char *remote_schema_dir = pcmk__remote_schema_dir();
/* Don't just crm_schema_init here because that will load the base
* schemas again too. Instead just load the things we fetched.
*/
pcmk__load_schemas_from_dir(remote_schema_dir);
pcmk__sort_schemas();
crm_info("Fetching extra schema files completed successfully");
} else {
if (signo == 0) {
crm_err("%s: process %d exited %d", errmsg, (int) pid, exitcode);
} else {
crm_err("%s: process %d terminated with signal %d (%s)%s",
errmsg, (int) pid, signo, strsignal(signo),
(core? " and dumped core" : ""));
}
/* Clean up any incomplete schema data we might have been downloading when
* the process timed out or crashed. We don't need to do any extra cleanup
* because we never loaded the extra schemas, and we don't need to call
* crm_schema_init because that was called in remoted_request_cib_schema_files
* before this function.
*/
clean_up_extra_schema_files();
}
}
void
remoted_request_cib_schema_files(void)
{
pid_t pid;
int rc;
/* If a previous schema-fetch process is still running when we're called
* again, it's hung. Attempt to kill it before cleaning up the extra
* directory.
*/
if (schema_fetch_pid != 0) {
if (mainloop_child_kill(schema_fetch_pid) == FALSE) {
crm_warn("Unable to kill pre-existing schema-fetch process");
return;
}
schema_fetch_pid = 0;
}
/* Clean up any extra schema files we downloaded from a previous cluster
* connection. After the files are gone, we need to wipe them from
* known_schemas, but there's no opposite operation for add_schema().
*
* Instead, unload all the schemas. This means we'll also forget about all
* installed schemas as well, which means that pcmk__highest_schema_name()
* would fail. So we need to load the base schemas right now.
*/
clean_up_extra_schema_files();
crm_schema_cleanup();
crm_schema_init();
crm_info("Fetching extra schema files from cluster");
pid = fork();
switch (pid) {
case -1: {
rc = errno;
crm_warn("Could not spawn process to get schema files: %s", pcmk_rc_str(rc));
break;
}
case 0:
/* child */
get_schema_files();
break;
default:
/* parent */
schema_fetch_pid = pid;
mainloop_child_add_with_flags(pid, 5 * 60 * 1000, "schema-fetch", NULL,
mainloop_leave_pid_group,
get_schema_files_complete);
break;
}
}

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