mount: helper support + improvements - ubase - suckless linux base utils
HTML git clone git://git.suckless.org/ubase
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit 71da5628d18492f48369d0d00cd86551ec7798d0
DIR parent ee5b04a7a3d12e8eeac9c9aa0f1ea45e644f854a
HTML Author: Hiltjo Posthuma <hiltjo@codemadness.org>
Date: Sun, 10 May 2015 18:19:15 +0200
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).
Diffstat:
M mount.8 | 18 +++++++++++++++++-
M mount.c | 153 ++++++++++++++++++++++++-------
2 files changed, 139 insertions(+), 32 deletions(-)
---
DIR diff --git a/mount.8 b/mount.8
@@ -36,7 +36,23 @@ This is the default action.
.It Fl o Ar options
Specify a comma separated string of filesystem specific options.
.It Fl t Ar fstype
-Set the filesystem type.
+Set the filesystem type. More than one type may be specified in a comma
+separated list. The list of file system types can be prefixed with "no" to
+specify the file system types for which action should not be taken. For
+example, the
+.Nm
+command:
+.Bd -literal
+# mount -a -t nonfs,ext4
+
+.Ed
+mounts all file systems except those of type NFS and EXT4.
+.Nm
+will attempt to execute a program in your
+.Ev PATH
+mount.XXX where XXX is replaced by the type name. For example, NFS file
+systems are mounted by the program
+.Pa mount.nfs .
.El
.Sh SEE ALSO
.Xr mount 2 ,
DIR diff --git a/mount.c b/mount.c
@@ -2,7 +2,9 @@
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
+#include <sys/wait.h>
+#include <errno.h>
#include <limits.h>
#include <mntent.h>
#include <stdio.h>
@@ -34,41 +36,117 @@ struct {
{ NULL, NULL, 0 }
};
+static unsigned long argflags = 0;
+static char *argopts = NULL;
+
+static char *
+findtype(const char *types, const char *t)
+{
+ const char *p;
+ size_t len;
+
+ for (len = strlen(t); (p = strstr(types, t)); types = p + len) {
+ if (!strncmp(p, t, len) && (p[len] == '\0' || p[len] == ','))
+ return (char *)p;
+ }
+ return NULL;
+}
+
static void
-parseopts(char *popts, unsigned long *flags, char *data, size_t datasiz)
+parseopts(const char *popts, unsigned long *flags, char *data, size_t datasiz)
{
unsigned int i, validopt;
size_t optlen, dlen = 0;
- char *name;
+ const char *name, *e;
+ name = popts;
data[0] = '\0';
- for (name = strtok(popts, ","); name; name = strtok(NULL, ",")) {
+ do {
+ if ((e = strstr(name, ",")))
+ optlen = e - name;
+ else
+ optlen = strlen(name);
+
validopt = 0;
for (i = 0; optnames[i].opt; i++) {
- if (optnames[i].opt && strcmp(name, optnames[i].opt) == 0) {
+ if (optnames[i].opt &&
+ !strncmp(name, optnames[i].opt, optlen)) {
*flags |= optnames[i].v;
validopt = 1;
break;
}
- if (optnames[i].notopt && strcmp(name, optnames[i].notopt) == 0) {
+ if (optnames[i].notopt &&
+ !strncmp(name, optnames[i].notopt, optlen)) {
*flags &= ~optnames[i].v;
validopt = 1;
break;
}
}
- if (!validopt) {
+
+ if (!validopt && optlen > 0) {
/* unknown option, pass as data option to mount() */
- if ((optlen = strlen(name))) {
- if (dlen + optlen + 2 >= datasiz)
- return; /* prevent overflow */
- if (dlen)
- data[dlen++] = ',';
- memcpy(&data[dlen], name, optlen);
- dlen += optlen;
- data[dlen] = '\0';
- }
+ if (dlen + optlen + 2 >= datasiz)
+ return; /* prevent overflow */
+ if (dlen)
+ data[dlen++] = ',';
+ memcpy(&data[dlen], name, optlen);
+ dlen += optlen;
+ data[dlen] = '\0';
+ }
+ name = e + 1;
+ } while (e);
+}
+
+static int
+mounthelper(const char *fsname, const char *dir, const char *fstype)
+{
+ pid_t pid;
+ char eprog[PATH_MAX];
+ char const *eargv[10];
+ int status, i;
+
+ pid = fork();
+ switch(pid) {
+ case -1:
+ break;
+ case 0:
+ snprintf(eprog, sizeof(eprog), "mount.%s", fstype);
+
+ i = 0;
+ eargv[i++] = eprog;
+ if (argflags & MS_BIND)
+ eargv[i++] = "-B";
+ if (argflags & MS_MOVE)
+ eargv[i++] = "-M";
+ if (argflags & MS_REC)
+ eargv[i++] = "-R";
+
+ if (argopts) {
+ eargv[i++] = "-o";
+ eargv[i++] = argopts;
+ }
+ eargv[i++] = fsname;
+ eargv[i++] = dir;
+ eargv[i] = NULL;
+
+ execvp(eprog, (char * const *)eargv);
+ if (errno == ENOENT)
+ _exit(1);
+ weprintf("execvp:");
+ _exit(1);
+ break;
+ default:
+ if (waitpid(pid, &status, 0) < 0) {
+ weprintf("waitpid:");
+ return -1;
}
+ if (WIFEXITED(status))
+ return WEXITSTATUS(status);
+ else if (WIFSIGNALED(status))
+ return 1;
+ break;
}
+ return 0;
}
static int
@@ -96,6 +174,7 @@ mounted(const char *dir)
return 1;
}
endmntent(fp);
+
return 0;
}
@@ -103,37 +182,37 @@ static void
usage(void)
{
eprintf("usage: %s [-BMRan] [-t fstype] [-o options] [source] [target]\n",
- argv0);
+ argv0);
}
int
main(int argc, char *argv[])
{
- int aflag = 0, oflag = 0, status = 0, i;
- unsigned long flags = 0;
char *types = NULL, data[512] = "", *resolvpath = NULL;
char *files[] = { "/proc/mounts", "/etc/fstab", NULL };
- size_t datasiz = sizeof(data);
const char *source, *target;
struct mntent *me = NULL;
+ int aflag = 0, oflag = 0, status = 0, i, r;
+ unsigned long flags = 0;
FILE *fp;
ARGBEGIN {
case 'B':
- flags |= MS_BIND;
+ argflags |= MS_BIND;
break;
case 'M':
- flags |= MS_MOVE;
+ argflags |= MS_MOVE;
break;
case 'R':
- flags |= MS_REC;
+ argflags |= MS_REC;
break;
case 'a':
aflag = 1;
break;
case 'o':
oflag = 1;
- parseopts(EARGF(usage()), &flags, data, datasiz);
+ argopts = EARGF(usage());
+ parseopts(argopts, &flags, data, sizeof(data));
break;
case 't':
types = EARGF(usage());
@@ -182,7 +261,7 @@ main(int argc, char *argv[])
source = me->mnt_fsname;
}
if (!oflag)
- parseopts(me->mnt_opts, &flags, data, datasiz);
+ parseopts(me->mnt_opts, &flags, data, sizeof(data));
if (!types)
types = me->mnt_type;
goto mountsingle;
@@ -195,7 +274,10 @@ main(int argc, char *argv[])
eprintf("can't find %s in /etc/fstab\n", target);
mountsingle:
- if (mount(source, target, types, flags, data) < 0) {
+ r = mounthelper(source, target, types);
+ if (r == -1)
+ status = 1;
+ if (r > 0 && mount(source, target, types, argflags | flags, data) < 0) {
weprintf("mount: %s:", source);
status = 1;
}
@@ -208,14 +290,23 @@ mountall:
if (!(fp = setmntent("/etc/fstab", "r")))
eprintf("setmntent %s:", "/etc/fstab");
while ((me = getmntent(fp))) {
- if (hasmntopt(me, MNTOPT_NOAUTO))
- continue;
- /* already mounted, skip */
- if (mounted(me->mnt_dir))
+ /* has "noauto" option or already mounted: skip */
+ if (hasmntopt(me, MNTOPT_NOAUTO) || mounted(me->mnt_dir))
continue;
flags = 0;
- parseopts(me->mnt_opts, &flags, data, datasiz);
- if (mount(me->mnt_fsname, me->mnt_dir, me->mnt_type, flags, data) < 0) {
+ parseopts(me->mnt_opts, &flags, data, sizeof(data));
+ /* if -t types specified:
+ * if non-match, skip
+ * if match and prefixed with "no", skip */
+ if (types &&
+ ((types[0] == 'n' && types[1] == 'o' &&
+ findtype(types + 2, me->mnt_type)) ||
+ (!findtype(types, me->mnt_type))))
+ continue;
+
+ r = mounthelper(me->mnt_fsname, me->mnt_dir, me->mnt_type);
+ if (r > 0 && mount(me->mnt_fsname, me->mnt_dir, me->mnt_type,
+ argflags | flags, data) < 0) {
weprintf("mount: %s:", me->mnt_fsname);
status = 1;
}