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/*
* rpc-pipefs-generator:
* systemd generator to create ordering dependencies between
* nfs services and the rpc_pipefs mountpoint
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <mntent.h>
#include "nfslib.h"
#include "conffile.h"
#include "systemd.h"
#define RPC_PIPEFS_DEFAULT NFS_STATEDIR "/rpc_pipefs"
static int generate_mount_unit(const char *pipefs_path, const char *pipefs_unit,
const char *dirname)
{
char *path;
FILE *f;
size_t size = (strlen(dirname) + 1 + strlen(pipefs_unit) + 1);
path = malloc(size);
if (!path)
return 1;
snprintf(path, size, "%s/%s", dirname, pipefs_unit);
f = fopen(path, "w");
if (!f)
{
free(path);
return 1;
}
fprintf(f, "# Automatically generated by rpc-pipefs-generator\n\n[Unit]\n");
fprintf(f, "Description=RPC Pipe File System\n");
fprintf(f, "DefaultDependencies=no\n");
fprintf(f, "After=systemd-tmpfiles-setup.service\n");
fprintf(f, "Conflicts=umount.target\n");
fprintf(f, "\n[Mount]\n");
fprintf(f, "What=sunrpc\n");
fprintf(f, "Where=%s\n", pipefs_path);
fprintf(f, "Type=rpc_pipefs\n");
fclose(f);
free(path);
return 0;
}
static
int generate_target(char *pipefs_path, const char *dirname)
{
char *path;
char filebase[] = "/rpc_pipefs.target";
char *pipefs_unit;
FILE *f;
int ret = 0;
pipefs_unit = systemd_escape(pipefs_path, ".mount");
if (!pipefs_unit)
return 1;
ret = generate_mount_unit(pipefs_path, pipefs_unit, dirname);
if (ret) {
free(pipefs_unit);
return ret;
}
path = malloc(strlen(dirname) + 1 + sizeof(filebase));
if (!path) {
free(pipefs_unit);
return 2;
}
sprintf(path, "%s", dirname);
mkdir(path, 0755);
strcat(path, filebase);
f = fopen(path, "w");
if (!f)
{
free(path);
free(pipefs_unit);
return 1;
}
fprintf(f, "# Automatically generated by rpc-pipefs-generator\n\n[Unit]\n");
fprintf(f, "Requires=%s\n", pipefs_unit);
fprintf(f, "After=%s\n", pipefs_unit);
fclose(f);
free(path);
free(pipefs_unit);
return 0;
}
static int is_non_pipefs_mountpoint(char *path)
{
FILE *mtab;
struct mntent *mnt;
mtab = setmntent("/etc/mtab", "r");
if (!mtab)
return 0;
while ((mnt = getmntent(mtab)) != NULL) {
if (strlen(mnt->mnt_dir) != strlen(path))
continue;
if (strncmp(mnt->mnt_dir, path, strlen(mnt->mnt_dir)))
continue;
if (strncmp(mnt->mnt_type, "rpc_pipefs", strlen(mnt->mnt_type)))
break;
}
fclose(mtab);
return mnt != NULL;
}
int main(int argc, char *argv[])
{
int ret;
char *s;
/* Avoid using any external services */
xlog_syslog(0);
if (argc != 4 || argv[1][0] != '/') {
fprintf(stderr, "rpc-pipefs-generator: create systemd dependencies for nfs services\n");
fprintf(stderr, "Usage: normal-dir early-dir late-dir\n");
exit(1);
}
conf_init_file(NFS_CONFFILE);
s = conf_get_str("general", "pipefs-directory");
if (!s)
exit(0);
if (strlen(s) == strlen(RPC_PIPEFS_DEFAULT) &&
strcmp(s, RPC_PIPEFS_DEFAULT) == 0)
exit(0);
if (is_non_pipefs_mountpoint(s))
exit(1);
ret = generate_target(s, argv[1]);
exit(ret);
}
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