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96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
/* vi: set sw=4 ts=4: */
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <mntent.h>
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#include "libbb.h"
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extern const char mtab_file[]; /* Defined in utility.c */
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static const int MS_RDONLY = 1; /* Mount read-only. */
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void erase_mtab(const char *name)
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{
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struct mntent entries[20];
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int count = 0;
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FILE *mountTable = setmntent(mtab_file, "r");
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struct mntent *m;
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/* Check if reading the mtab file failed */
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if (mountTable == 0
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/* Bummer. fall back on trying the /proc filesystem */
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&& (mountTable = setmntent("/proc/mounts", "r")) == 0) {
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perror_msg("%s", mtab_file);
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return;
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}
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while ((m = getmntent(mountTable)) != 0) {
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entries[count].mnt_fsname = strdup(m->mnt_fsname);
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entries[count].mnt_dir = strdup(m->mnt_dir);
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entries[count].mnt_type = strdup(m->mnt_type);
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entries[count].mnt_opts = strdup(m->mnt_opts);
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entries[count].mnt_freq = m->mnt_freq;
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entries[count].mnt_passno = m->mnt_passno;
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count++;
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}
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endmntent(mountTable);
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if ((mountTable = setmntent(mtab_file, "w"))) {
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int i;
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for (i = 0; i < count; i++) {
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int result = (strcmp(entries[i].mnt_fsname, name) == 0
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|| strcmp(entries[i].mnt_dir, name) == 0);
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if (result)
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continue;
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else
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addmntent(mountTable, &entries[i]);
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}
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endmntent(mountTable);
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} else if (errno != EROFS)
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perror_msg("%s", mtab_file);
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}
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void write_mtab(char *blockDevice, char *directory,
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char *filesystemType, long flags, char *string_flags)
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{
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FILE *mountTable = setmntent(mtab_file, "a+");
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struct mntent m;
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if (mountTable == 0) {
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perror_msg("%s", mtab_file);
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return;
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}
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if (mountTable) {
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int length = strlen(directory);
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if (length > 1 && directory[length - 1] == '/')
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directory[length - 1] = '\0';
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if (filesystemType == 0) {
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struct mntent *p = find_mount_point(blockDevice, "/proc/mounts");
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if (p && p->mnt_type)
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filesystemType = p->mnt_type;
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}
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m.mnt_fsname = blockDevice;
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m.mnt_dir = directory;
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m.mnt_type = filesystemType ? filesystemType : "default";
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if (*string_flags) {
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m.mnt_opts = string_flags;
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} else {
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if ((flags | MS_RDONLY) == flags)
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m.mnt_opts = "ro";
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else
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m.mnt_opts = "rw";
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}
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m.mnt_freq = 0;
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m.mnt_passno = 0;
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addmntent(mountTable, &m);
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endmntent(mountTable);
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}
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}
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