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/*
* nfs-server-generator:
* systemd generator to create ordering dependencies between
* nfs-server and various filesystem mounts
*
* 1/ nfs-server should start Before any 'nfs' mountpoints are
* mounted, in case they are loop-back mounts. This ordering is particularly
* important for the shutdown side, so the nfs-server is stopped
* after the filesystems are unmounted.
* 2/ nfs-server should start After all exported filesystems are mounted
* so there is no risk of exporting the underlying directory.
* This is particularly important for _net mounts which
* are not caught by "local-fs.target".
*/
#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 <alloca.h>
#include "misc.h"
#include "nfslib.h"
#include "exportfs.h"
#include "systemd.h"
/* A simple "set of strings" to remove duplicates
* found in /etc/exports
*/
struct list {
struct list *next;
char *name;
};
static int is_unique(struct list **lp, char *path)
{
struct list *l = *lp;
while (l) {
if (strcmp(l->name, path) == 0)
return 0;
l = l->next;
}
l = malloc(sizeof(*l));
if (l == NULL)
return 0;
l->name = path;
l->next = *lp;
*lp = l;
return 1;
}
static int has_noauto_flag(char *path)
{
FILE *fstab;
struct mntent *mnt;
fstab = setmntent("/etc/fstab", "r");
if (!fstab)
return 0;
while ((mnt = getmntent(fstab)) != NULL) {
int l = strlen(mnt->mnt_dir);
if (strncmp(mnt->mnt_dir, path, l) != 0)
continue;
if (path[l] && path[l] != '/')
continue;
if (hasmntopt(mnt, "noauto"))
break;
}
fclose(fstab);
return mnt != NULL;
}
int main(int argc, char *argv[])
{
char *path, *spath;
char dirbase[] = "/nfs-server.service.d";
char filebase[] = "/order-with-mounts.conf";
nfs_export *exp;
int i;
struct list *list = NULL;
FILE *f, *fstab;
struct mntent *mnt;
/* Avoid using any external services */
xlog_syslog(0);
if (argc != 4 || argv[1][0] != '/') {
fprintf(stderr, "nfs-server-generator: create systemd dependencies for nfs-server\n");
fprintf(stderr, "Usage: normal-dir early-dir late-dir\n");
exit(1);
}
path = alloca(strlen(argv[1]) + sizeof(dirbase) + sizeof(filebase));
if (!path)
exit(2);
if (export_read(_PATH_EXPORTS, 1) +
export_d_read(_PATH_EXPORTS_D, 1) == 0)
/* Nothing is exported, so nothing to do */
exit(0);
strcat(strcpy(path, argv[1]), dirbase);
mkdir(path, 0755);
strcat(path, filebase);
f = fopen(path, "w");
if (!f)
exit(1);
fprintf(f, "# Automatically generated by nfs-server-generator\n\n[Unit]\n");
for (i = 0; i < MCL_MAXTYPES; i++) {
for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
if (!is_unique(&list, exp->m_export.e_path))
continue;
if (exp->m_export.e_mountpoint)
continue;
if (has_noauto_flag(exp->m_export.e_path))
continue;
if (strchr(exp->m_export.e_path, ' '))
fprintf(f, "RequiresMountsFor=\"%s\"\n",
exp->m_export.e_path);
else
fprintf(f, "RequiresMountsFor=%s\n",
exp->m_export.e_path);
}
}
fstab = setmntent("/etc/fstab", "r");
if (!fstab)
exit(1);
while ((mnt = getmntent(fstab)) != NULL) {
if (strcmp(mnt->mnt_type, "nfs") != 0 &&
strcmp(mnt->mnt_type, "nfs4") != 0)
continue;
spath = systemd_escape(mnt->mnt_dir, ".mount");
if (!spath) {
fprintf(stderr,
"nfs-server-generator: convert path failed: %s\n",
mnt->mnt_dir);
continue;
}
fprintf(f, "Before=%s\n", spath);
}
fclose(fstab);
fclose(f);
exit(0);
}
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