1414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley/* mount.c - mount filesystems 2414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley * 3414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley * Copyright 2014 Rob Landley <rob@landley.net> 4414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley * 5414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/mount.html 6414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley * Note: -hV is bad spec, haven't implemented -FsLU yet 7414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley * no mtab (/proc/mounts does it) so -n is NOP. 8414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 91dd3704c5ffea926f61a96bb7de7d9dbee52fa44Paul BarkerUSE_MOUNT(NEWTOY(mount, "?O:afnrvwt:o*[-rw]", TOYFLAG_BIN|TOYFLAG_STAYROOT)) 10a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley//USE_NFSMOUNT(NEWTOY(nfsmount, "?<2>2", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_STAYROOT)) 11414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 12414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landleyconfig MOUNT 13414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley bool "mount" 149b4ea9cf9934d5639a7d1a9b50b90b8d5569ba7eRob Landley default y 15414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley help 16414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley usage: mount [-afFrsvw] [-t TYPE] [-o OPTIONS...] [[DEVICE] DIR] 17414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 18414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley Mount new filesystem(s) on directories. With no arguments, display existing 19414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley mounts. 20414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 21414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley -a mount all entries in /etc/fstab (with -t, only entries of that TYPE) 22e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley -O only mount -a entries that have this option 23414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley -f fake it (don't actually mount) 24414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley -r read only (same as -o ro) 25414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley -w read/write (default, same as -o rw) 26414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley -t specify filesystem type 27414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley -v verbose 28414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 29414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley OPTIONS is a comma separated list of options, which can also be supplied 30414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley as --longopts. 31414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 32414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley This mount autodetects loopback mounts (a file on a directory) and 33414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley bind mounts (file on file, directory on directory), so you don't need 34e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley to say --bind or --loop. You can also "mount -a /path" to mount everything 35e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley in /etc/fstab under /path, even if it's noauto. 36360d57f843f5435a75270e54583430dcb8f62546Rob Landley 37a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley#config NFSMOUNT 38a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley# bool "nfsmount" 39a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley# default n 40a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley# help 41a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley# usage: nfsmount SHARE DIR 42a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley# 43a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley# Invoke an eldrich horror from the dawn of time. 44414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley*/ 45414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 46414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley#define FOR_mount 47414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley#include "toys.h" 48414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 49414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob LandleyGLOBALS( 50414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley struct arg_list *optlist; 51414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley char *type; 52e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley char *bigO; 53414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 54414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley unsigned long flags; 55414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley char *opts; 56e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley int okuser; 57414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley) 58414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 59776aa3cb927f889a0481c2530128940c75984febRob Landley// mount.tests should check for all of this: 60e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO detect existing identical mount (procfs with different dev name?) 61e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO user, users, owner, group, nofail 62e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO -p (passfd) 63e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO -a -t notype,type2 64e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO --subtree 65e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO --rbind, -R 66e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO make "mount --bind,ro old new" work (implicit -o remount) 67e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO mount -a 68e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO mount -o remount 69e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO fstab: lookup default options for mount 70e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO implement -v 7172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// TODO "mount -a -o remount,ro" should detect overmounts 7272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// TODO work out how that differs from "mount -ar" 7372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// TODO what if you --bind mount a block device somewhere (file, dir, dev) 7472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// TODO "touch servername; mount -t cifs servername path" 75679a21d674cf487992c0ccabc8666c417e59d390Rob Landley// TODO mount -o remount a user mount 764f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley// TODO mount image.img sub (auto-loopback) then umount image.img 77e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 78e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// Strip flags out of comma separated list of options, return flags,. 79e996bddf88a946a8ac8338c02e14add57e3d588cRob Landleystatic long flag_opts(char *new, long flags, char **more) 8044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley{ 8144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley struct { 8244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley char *name; 8344e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley long flags; 8444e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley } opts[] = { 8544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley // NOPs (we autodetect --loop and --bind) 8644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"loop", 0}, {"bind", 0}, {"defaults", 0}, {"quiet", 0}, 87e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley {"user", 0}, {"nouser", 0}, // checked in fstab, ignored in -o 8844e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"ro", MS_RDONLY}, {"rw", ~MS_RDONLY}, 8944e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"nosuid", MS_NOSUID}, {"suid", ~MS_NOSUID}, 9044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"nodev", MS_NODEV}, {"dev", ~MS_NODEV}, 9144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"noexec", MS_NOEXEC}, {"exec", ~MS_NOEXEC}, 9244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"sync", MS_SYNCHRONOUS}, {"async", ~MS_SYNCHRONOUS}, 9344e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"noatime", MS_NOATIME}, {"atime", ~MS_NOATIME}, 9444e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"nodiratime", MS_NODIRATIME}, {"diratime", ~MS_NODIRATIME}, 9544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"loud", ~MS_SILENT}, 9644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"shared", MS_SHARED}, {"rshared", MS_SHARED|MS_REC}, 9744e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"slave", MS_SLAVE}, {"rslave", MS_SLAVE|MS_REC}, 9844e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"private", MS_PRIVATE}, {"rprivate", MS_SLAVE|MS_REC}, 9944e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"unbindable", MS_UNBINDABLE}, {"runbindable", MS_UNBINDABLE|MS_REC}, 100056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley {"remount", MS_REMOUNT}, {"move", MS_MOVE}, 10144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley // mand dirsync rec iversion strictatime 10244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley }; 10344e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 104e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley if (new) for (;;) { 10544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley char *comma = strchr(new, ','); 10644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley int i; 10744e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 10844e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley if (comma) *comma = 0; 10944e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 11044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley // If we recognize an option, apply flags 11144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley for (i = 0; i < ARRAY_LEN(opts); i++) if (!strcasecmp(opts[i].name, new)) { 11244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley long ll = opts[i].flags; 11344e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 11444e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley if (ll < 0) flags &= ll; 11544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley else flags |= ll; 11644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 11744e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley break; 11844e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley } 11944e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 12044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley // If we didn't recognize it, keep string version 12144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley if (more && i == ARRAY_LEN(opts)) { 12244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley i = *more ? strlen(*more) : 0; 12344e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley *more = xrealloc(*more, i + strlen(new) + 2); 12444e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley if (i) (*more)[i++] = ','; 12544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley strcpy(i+*more, new); 12644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley } 12744e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 12844e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley if (!comma) break; 12944e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley *comma = ','; 13044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley new = comma + 1; 13144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley } 13244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 13344e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley return flags; 13444e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley} 13544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 13644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landleystatic void mount_filesystem(char *dev, char *dir, char *type, 13744e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley unsigned long flags, char *opts) 138414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley{ 139414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley FILE *fp = 0; 140414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley int rc = EINVAL; 1414f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley char *buf = 0; 142414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 143414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley if (toys.optflags & FLAG_f) return; 144414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 145e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley if (getuid()) { 146e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley if (TT.okuser) TT.okuser = 0; 147e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley else { 14870a84a356b1c56743618362867b9300007d11998Rob Landley error_msg("'%s' not user mountable in fstab", dev); 14970a84a356b1c56743618362867b9300007d11998Rob Landley 150e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley return; 151e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } 152e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } 153e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 154056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley // Autodetect bind mount or filesystem type 155cc3bf66666cb0d2c8937b1a60c2be8d3f5a49d04Rob Landley 156cc3bf66666cb0d2c8937b1a60c2be8d3f5a49d04Rob Landley if (type && !strcmp(type, "auto")) type = 0; 157cc3bf66666cb0d2c8937b1a60c2be8d3f5a49d04Rob Landley if (flags & MS_MOVE) { 158cc3bf66666cb0d2c8937b1a60c2be8d3f5a49d04Rob Landley if (type) error_exit("--move with -t"); 159cc3bf66666cb0d2c8937b1a60c2be8d3f5a49d04Rob Landley } else if (!type) { 16044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley struct stat stdev, stdir; 16144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 162e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley // file on file or dir on dir is a --bind mount. 163056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley if (!stat(dev, &stdev) && !stat(dir, &stdir) 164056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley && ((S_ISREG(stdev.st_mode) && S_ISREG(stdir.st_mode)) 165056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley || (S_ISDIR(stdev.st_mode) && S_ISDIR(stdir.st_mode)))) 166056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley { 167056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley flags |= MS_BIND; 168056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley } else fp = xfopen("/proc/filesystems", "r"); 169e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } else if (!strcmp(type, "ignore")) return; 170e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley else if (!strcmp(type, "swap")) 171360d57f843f5435a75270e54583430dcb8f62546Rob Landley toys.exitval |= xrun((char *[]){"swapon", "--", dev, 0}); 172414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 173414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley for (;;) { 174776aa3cb927f889a0481c2530128940c75984febRob Landley int fd = -1, ro = 0; 175776aa3cb927f889a0481c2530128940c75984febRob Landley 176414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley // If type wasn't specified, try all of them in order. 1774f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley if (fp && !buf) { 178414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley size_t i; 179414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 180414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley if (getline(&buf, &i, fp)<0) break; 181414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley type = buf; 182414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley // skip nodev devices 183414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley if (!isspace(*type)) { 184414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley free(buf); 1854f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley buf = 0; 1864f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley 187414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley continue; 188414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley } 189414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley // trim whitespace 190414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley while (isspace(*type)) type++; 191414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley i = strlen(type); 192414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley if (i) type[i-1] = 0; 193414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley } 19444e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley if (toys.optflags & FLAG_v) 19544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley printf("try '%s' type '%s' on '%s'\n", dev, type, dir); 19672e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley for (;;) { 19772e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley rc = mount(dev, dir, type, flags, opts); 19872e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if ((rc != EACCES && rc != EROFS) || (flags & MS_RDONLY)) break; 199776aa3cb927f889a0481c2530128940c75984febRob Landley if (rc == EROFS && fd == -1) { 200776aa3cb927f889a0481c2530128940c75984febRob Landley if (-1 != (fd = open(dev, O_RDONLY))) { 201776aa3cb927f889a0481c2530128940c75984febRob Landley ioctl(fd, BLKROSET, &ro); 202776aa3cb927f889a0481c2530128940c75984febRob Landley close(fd); 203776aa3cb927f889a0481c2530128940c75984febRob Landley 204776aa3cb927f889a0481c2530128940c75984febRob Landley continue; 205776aa3cb927f889a0481c2530128940c75984febRob Landley } 206776aa3cb927f889a0481c2530128940c75984febRob Landley } 20772e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley fprintf(stderr, "'%s' is read-only", dev); 20872e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley flags |= MS_RDONLY; 209056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley } 21025fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley 21125fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // Trying to autodetect loop mounts like bind mounts above (file on dir) 21225fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // isn't good enough because "mount -t ext2 fs.img dir" is valid, but if 21325fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // you _do_ accept loop mounts with -t how do you tell "-t cifs" isn't 21425fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // looking for a block device if it's not in /proc/filesystems yet 21525fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // because the module that won't be loaded until you try the mount, and 21625fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // if you can't then DEVICE existing as a file would cause a false 21725fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // positive loopback mount (so "touch servername" becomes a potential 21825fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // denial of service attack...) 21925fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // 22025fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // Solution: try the mount, let the kernel tell us it wanted a block 22125fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // device, then do the loopback setup and retry the mount. 22225fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley 2234f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley if (rc && errno == ENOTBLK) { 22425fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley char *losetup[] = {"losetup", "-fs", dev, 0}; 225360d57f843f5435a75270e54583430dcb8f62546Rob Landley int pipe, len; 22625fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley pid_t pid; 22725fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley 22825fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley if (flags & MS_RDONLY) losetup[1] = "-fsr"; 229360d57f843f5435a75270e54583430dcb8f62546Rob Landley pid = xpopen(losetup, &pipe, 1); 230360d57f843f5435a75270e54583430dcb8f62546Rob Landley len = readall(pipe, toybuf, sizeof(toybuf)-1); 231360d57f843f5435a75270e54583430dcb8f62546Rob Landley rc = xpclose(pid, pipe); 23225fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley if (!rc && len > 1) { 23325fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley if (toybuf[len-1] == '\n') --len; 23425fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley toybuf[len] = 0; 23525fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley dev = toybuf; 23672e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 23725fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley continue; 2384f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley } 2394f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley error_msg("losetup failed %d", rc); 2404f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley 2414f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley break; 2424f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley } 2434f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley 2444f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley free(buf); 2454f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley buf = 0; 2464f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley if (!rc) break; 2474f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley if (fp && (errno == EINVAL || errno == EBUSY)) continue; 2484f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley 2494f0c3de1bf0b6755ea5b5c9c6ae1db9651784794Rob Landley perror_msg("'%s'->'%s'", dev, dir); 25025fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley 25125fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley break; 252414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley } 253414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley if (fp) fclose(fp); 254414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley} 255414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 256414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landleyvoid mount_main(void) 257414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley{ 258e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley char *opts = 0, *dev = 0, *dir = 0, **ss; 25944e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley long flags = MS_SILENT; 26044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley struct arg_list *o; 261a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley struct mtab_list *mtl, *mtl2 = 0, *mm, *remount; 262414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 263a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley// TODO 26472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// remount 26572e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// - overmounts 26672e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// shared subtree 26772e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// -o parsed after fstab options 26872e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// test if mountpoint already exists (-o noremount?) 26972e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 27072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // First pass; just accumulate string, don't parse flags yet. (This is so 27172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // we can modify fstab entries with -a, or mtab with remount.) 27272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley for (o = TT.optlist; o; o = o->next) comma_collate(&opts, o->arg); 27372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (toys.optflags & FLAG_r) comma_collate(&opts, "ro"); 27472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (toys.optflags & FLAG_w) comma_collate(&opts, "rw"); 27544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 276e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley // Treat each --option as -o option 277e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley for (ss = toys.optargs; *ss; ss++) { 27872e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley char *sss = *ss; 27972e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 28072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // If you realy, really want to mount a file named "--", we support it. 28172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (sss[0]=='-' && sss[1]=='-' && sss[2]) comma_collate(&opts, sss+2); 28272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley else if (!dev) dev = sss; 28372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley else if (!dir) dir = sss; 284e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley // same message as lib/args.c ">2" which we can't use because --opts count 285e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley else error_exit("Max 2 arguments\n"); 286e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } 287414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 28872e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if ((toys.optflags & FLAG_a) && dir) error_exit("-a with >1 arg"); 28972e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 29072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // For remount we need _last_ match (in case of overmounts), so traverse 291a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley // in reverse order. (Yes I'm using remount as a boolean for a bit here, 292a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley // the double cast is to get gcc to shut up about it.) 293a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley remount = (void *)(long)comma_scan(opts, "remount", 1); 294a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley if (((toys.optflags & FLAG_a) && !access("/proc/mounts", R_OK)) || remount) { 295a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley mm = dlist_terminate(mtl = mtl2 = xgetmountlist(0)); 296a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley if (remount) remount = mm; 297a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley } 298e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 299e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley // Do we need to do an /etc/fstab trawl? 30072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // This covers -a, -o remount, one argument, all user mounts 30125fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley if ((toys.optflags & FLAG_a) || (dev && (!dir || getuid() || remount))) { 302679a21d674cf487992c0ccabc8666c417e59d390Rob Landley if (!remount) dlist_terminate(mtl = xgetmountlist("/etc/fstab")); 30325fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley 30472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley for (mm = remount ? remount : mtl; mm; mm = (remount ? mm->prev : mm->next)) 305e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley { 30672e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley char *aopts = 0; 307a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley struct mtab_list *mmm = 0; 308a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley int aflags, noauto, len; 309e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 31072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // Check for noauto and get it out of the option list. (Unknown options 31172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // that make it to the kernel give filesystem drivers indigestion.) 31272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley noauto = comma_scan(mm->opts, "noauto", 1); 313a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley 314e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley if (toys.optflags & FLAG_a) { 31572e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // "mount -a /path" to mount all entries under /path 31672e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (dev) { 31772e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley len = strlen(dev); 31872e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (strncmp(dev, mm->dir, len) 31972e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley || (mm->dir[len] && mm->dir[len] != '/')) continue; 32072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley } else if (noauto) continue; // never present in the remount case 32172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (!mountlist_istype(mm,TT.type) || !comma_scanall(mm->opts,TT.bigO)) 322e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley continue; 323e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } else { 32472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (dir && strcmp(dir, mm->dir)) continue; 32572e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (dev && strcmp(dev, mm->device) && (dir || strcmp(dev, mm->dir))) 326e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley continue; 327e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } 328e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 329a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley // Don't overmount the same dev on the same directory 330a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley // (Unless root explicitly says to in non -a mode.) 331a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley if (mtl2 && !remount) 332a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley for (mmm = mtl2; mmm; mmm = mmm->next) 333a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley if (!strcmp(mm->dir, mmm->dir) && !strcmp(mm->device, mmm->device)) 334a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley break; 335a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley 336e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley // user only counts from fstab, not opts. 337a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley if (!mmm) { 338a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley TT.okuser = comma_scan(mm->opts, "user", 1); 339a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley aflags = flag_opts(mm->opts, flags, &aopts); 340a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley aflags = flag_opts(opts, aflags, &aopts); 341e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 342a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley mount_filesystem(mm->device, mm->dir, mm->type, aflags, aopts); 343a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley } // TODO else if (getuid()) error_msg("already there") ? 344e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley free(aopts); 34572e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 34672e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (!(toys.optflags & FLAG_a)) break; 347e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } 348a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley if (CFG_TOYBOX_FREE) { 349a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley llist_traverse(mtl, free); 350a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley llist_traverse(mtl2, free); 351a03a0449e810c26f001cdfc56e5527f51577a639Rob Landley } 352679a21d674cf487992c0ccabc8666c417e59d390Rob Landley if (!mm && !(toys.optflags & FLAG_a)) 353679a21d674cf487992c0ccabc8666c417e59d390Rob Landley error_exit("'%s' not in %s", dir ? dir : dev, 354679a21d674cf487992c0ccabc8666c417e59d390Rob Landley remount ? "/proc/mounts" : "fstab"); 355e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 35672e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // show mounts from /proc/mounts 35772e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley } else if (!dev) { 358e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley for (mtl = xgetmountlist(0); mtl && (mm = dlist_pop(&mtl)); free(mm)) { 359414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley char *s = 0; 360414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 361e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley if (TT.type && strcmp(TT.type, mm->type)) continue; 362e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley if (*mm->device == '/') s = xabspath(mm->device, 0); 363414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley xprintf("%s on %s type %s (%s)\n", 364e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley s ? s : mm->device, mm->dir, mm->type, mm->opts); 365414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley free(s); 366414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley } 367414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 368414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley // two arguments 36972e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley } else { 37072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley char *more = 0; 37172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 37272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley mount_filesystem(dev, dir, TT.type, flag_opts(opts, flags, &more), more); 37372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (CFG_TOYBOX_FREE) free(more); 37472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley } 375414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley} 376