mount: helper support + improvements
- helper support (mount.type).
- helpers need to be in $PATH, if needed we can add a check for
/sbin/mount.XXXX
- pass -B, -M, -R to helper, its more reliable to pass these named
options with -o however.
- allow prefix "no" for which type no action should be taken:
mount -a -t nonfs,ext4
fix bugs:
- dont modify me->mnt_opts (used strtok).
This commit is contained in:
Hiltjo Posthuma
sin
parent
ee5b04a7a3
commit
71da5628d1
18
mount.8
18
mount.8
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@ -36,7 +36,23 @@ This is the default action.
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.It Fl o Ar options
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Specify a comma separated string of filesystem specific options.
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.It Fl t Ar fstype
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Set the filesystem type.
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Set the filesystem type. More than one type may be specified in a comma
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separated list. The list of file system types can be prefixed with "no" to
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specify the file system types for which action should not be taken. For
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example, the
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.Nm
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command:
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.Bd -literal
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# mount -a -t nonfs,ext4
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.Ed
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mounts all file systems except those of type NFS and EXT4.
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.Nm
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will attempt to execute a program in your
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.Ev PATH
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mount.XXX where XXX is replaced by the type name. For example, NFS file
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systems are mounted by the program
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.Pa mount.nfs .
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.El
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.Sh SEE ALSO
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.Xr mount 2 ,
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153
mount.c
153
mount.c
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@ -2,7 +2,9 @@
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <limits.h>
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#include <mntent.h>
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#include <stdio.h>
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@ -34,41 +36,117 @@ struct {
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{ NULL, NULL, 0 }
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};
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static unsigned long argflags = 0;
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static char *argopts = NULL;
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static char *
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findtype(const char *types, const char *t)
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{
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const char *p;
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size_t len;
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for (len = strlen(t); (p = strstr(types, t)); types = p + len) {
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if (!strncmp(p, t, len) && (p[len] == '\0' || p[len] == ','))
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return (char *)p;
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}
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return NULL;
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}
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static void
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parseopts(char *popts, unsigned long *flags, char *data, size_t datasiz)
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parseopts(const char *popts, unsigned long *flags, char *data, size_t datasiz)
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{
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unsigned int i, validopt;
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size_t optlen, dlen = 0;
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char *name;
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const char *name, *e;
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name = popts;
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data[0] = '\0';
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for (name = strtok(popts, ","); name; name = strtok(NULL, ",")) {
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do {
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if ((e = strstr(name, ",")))
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optlen = e - name;
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else
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optlen = strlen(name);
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validopt = 0;
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for (i = 0; optnames[i].opt; i++) {
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if (optnames[i].opt && strcmp(name, optnames[i].opt) == 0) {
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if (optnames[i].opt &&
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!strncmp(name, optnames[i].opt, optlen)) {
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*flags |= optnames[i].v;
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validopt = 1;
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break;
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}
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if (optnames[i].notopt && strcmp(name, optnames[i].notopt) == 0) {
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if (optnames[i].notopt &&
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!strncmp(name, optnames[i].notopt, optlen)) {
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*flags &= ~optnames[i].v;
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validopt = 1;
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break;
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}
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}
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if (!validopt) {
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if (!validopt && optlen > 0) {
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/* unknown option, pass as data option to mount() */
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if ((optlen = strlen(name))) {
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if (dlen + optlen + 2 >= datasiz)
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return; /* prevent overflow */
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if (dlen)
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data[dlen++] = ',';
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memcpy(&data[dlen], name, optlen);
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dlen += optlen;
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data[dlen] = '\0';
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}
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if (dlen + optlen + 2 >= datasiz)
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return; /* prevent overflow */
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if (dlen)
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data[dlen++] = ',';
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memcpy(&data[dlen], name, optlen);
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dlen += optlen;
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data[dlen] = '\0';
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}
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name = e + 1;
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} while (e);
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}
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static int
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mounthelper(const char *fsname, const char *dir, const char *fstype)
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{
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pid_t pid;
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char eprog[PATH_MAX];
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char const *eargv[10];
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int status, i;
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pid = fork();
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switch(pid) {
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case -1:
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break;
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case 0:
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snprintf(eprog, sizeof(eprog), "mount.%s", fstype);
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i = 0;
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eargv[i++] = eprog;
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if (argflags & MS_BIND)
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eargv[i++] = "-B";
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if (argflags & MS_MOVE)
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eargv[i++] = "-M";
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if (argflags & MS_REC)
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eargv[i++] = "-R";
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if (argopts) {
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eargv[i++] = "-o";
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eargv[i++] = argopts;
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}
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eargv[i++] = fsname;
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eargv[i++] = dir;
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eargv[i] = NULL;
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execvp(eprog, (char * const *)eargv);
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if (errno == ENOENT)
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_exit(1);
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weprintf("execvp:");
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_exit(1);
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break;
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default:
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if (waitpid(pid, &status, 0) < 0) {
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weprintf("waitpid:");
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return -1;
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}
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if (WIFEXITED(status))
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return WEXITSTATUS(status);
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else if (WIFSIGNALED(status))
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return 1;
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break;
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}
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return 0;
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}
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static int
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@ -96,6 +174,7 @@ mounted(const char *dir)
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return 1;
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}
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endmntent(fp);
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return 0;
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}
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@ -103,37 +182,37 @@ static void
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usage(void)
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{
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eprintf("usage: %s [-BMRan] [-t fstype] [-o options] [source] [target]\n",
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argv0);
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argv0);
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}
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int
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main(int argc, char *argv[])
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{
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int aflag = 0, oflag = 0, status = 0, i;
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unsigned long flags = 0;
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char *types = NULL, data[512] = "", *resolvpath = NULL;
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char *files[] = { "/proc/mounts", "/etc/fstab", NULL };
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size_t datasiz = sizeof(data);
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const char *source, *target;
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struct mntent *me = NULL;
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int aflag = 0, oflag = 0, status = 0, i, r;
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unsigned long flags = 0;
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FILE *fp;
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ARGBEGIN {
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case 'B':
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flags |= MS_BIND;
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argflags |= MS_BIND;
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break;
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case 'M':
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flags |= MS_MOVE;
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argflags |= MS_MOVE;
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break;
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case 'R':
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flags |= MS_REC;
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argflags |= MS_REC;
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break;
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case 'a':
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aflag = 1;
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break;
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case 'o':
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oflag = 1;
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parseopts(EARGF(usage()), &flags, data, datasiz);
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argopts = EARGF(usage());
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parseopts(argopts, &flags, data, sizeof(data));
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break;
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case 't':
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types = EARGF(usage());
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@ -182,7 +261,7 @@ main(int argc, char *argv[])
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source = me->mnt_fsname;
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}
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if (!oflag)
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parseopts(me->mnt_opts, &flags, data, datasiz);
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parseopts(me->mnt_opts, &flags, data, sizeof(data));
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if (!types)
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types = me->mnt_type;
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goto mountsingle;
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@ -195,7 +274,10 @@ main(int argc, char *argv[])
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eprintf("can't find %s in /etc/fstab\n", target);
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mountsingle:
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if (mount(source, target, types, flags, data) < 0) {
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r = mounthelper(source, target, types);
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if (r == -1)
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status = 1;
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if (r > 0 && mount(source, target, types, argflags | flags, data) < 0) {
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weprintf("mount: %s:", source);
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status = 1;
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}
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@ -208,14 +290,23 @@ mountall:
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if (!(fp = setmntent("/etc/fstab", "r")))
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eprintf("setmntent %s:", "/etc/fstab");
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while ((me = getmntent(fp))) {
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if (hasmntopt(me, MNTOPT_NOAUTO))
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continue;
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/* already mounted, skip */
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if (mounted(me->mnt_dir))
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/* has "noauto" option or already mounted: skip */
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if (hasmntopt(me, MNTOPT_NOAUTO) || mounted(me->mnt_dir))
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continue;
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flags = 0;
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parseopts(me->mnt_opts, &flags, data, datasiz);
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if (mount(me->mnt_fsname, me->mnt_dir, me->mnt_type, flags, data) < 0) {
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parseopts(me->mnt_opts, &flags, data, sizeof(data));
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/* if -t types specified:
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* if non-match, skip
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* if match and prefixed with "no", skip */
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if (types &&
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((types[0] == 'n' && types[1] == 'o' &&
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findtype(types + 2, me->mnt_type)) ||
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(!findtype(types, me->mnt_type))))
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continue;
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r = mounthelper(me->mnt_fsname, me->mnt_dir, me->mnt_type);
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if (r > 0 && mount(me->mnt_fsname, me->mnt_dir, me->mnt_type,
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argflags | flags, data) < 0) {
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weprintf("mount: %s:", me->mnt_fsname);
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status = 1;
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}
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