mount.c revision cc3bf66666cb0d2c8937b1a60c2be8d3f5a49d04
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 9e996bddf88a946a8ac8338c02e14add57e3d588cRob LandleyUSE_MOUNT(NEWTOY(mount, "?O:afnrvwt:o*[-rw]", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_STAYROOT)) 10414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 11414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landleyconfig MOUNT 12414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley bool "mount" 13414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley default n 14414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley help 15414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley usage: mount [-afFrsvw] [-t TYPE] [-o OPTIONS...] [[DEVICE] DIR] 16414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 17414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley Mount new filesystem(s) on directories. With no arguments, display existing 18414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley mounts. 19414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 20414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley -a mount all entries in /etc/fstab (with -t, only entries of that TYPE) 21e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley -O only mount -a entries that have this option 22414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley -f fake it (don't actually mount) 23414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley -r read only (same as -o ro) 24414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley -w read/write (default, same as -o rw) 25414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley -t specify filesystem type 26414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley -v verbose 27414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 28414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley OPTIONS is a comma separated list of options, which can also be supplied 29414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley as --longopts. 30414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 31414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley This mount autodetects loopback mounts (a file on a directory) and 32414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley bind mounts (file on file, directory on directory), so you don't need 33e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley to say --bind or --loop. You can also "mount -a /path" to mount everything 34e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley in /etc/fstab under /path, even if it's noauto. 35414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley*/ 36414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 37414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley#define FOR_mount 38414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley#include "toys.h" 39414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 40414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob LandleyGLOBALS( 41414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley struct arg_list *optlist; 42414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley char *type; 43e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley char *bigO; 44414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 45414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley unsigned long flags; 46414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley char *opts; 47e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley int okuser; 48414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley) 49414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 50e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO detect existing identical mount (procfs with different dev name?) 51e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO user, users, owner, group, nofail 52e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO -p (passfd) 53e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO -a -t notype,type2 54e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO --subtree 55e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO --rbind, -R 56e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO make "mount --bind,ro old new" work (implicit -o remount) 57e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO mount -a 58e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO mount -o remount 59e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO fstab: lookup default options for mount 60e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// TODO implement -v 6172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// TODO "mount -a -o remount,ro" should detect overmounts 6272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// TODO work out how that differs from "mount -ar" 6372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// TODO what if you --bind mount a block device somewhere (file, dir, dev) 6472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// TODO "touch servername; mount -t cifs servername path" 65e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 66e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley// Strip flags out of comma separated list of options, return flags,. 67e996bddf88a946a8ac8338c02e14add57e3d588cRob Landleystatic long flag_opts(char *new, long flags, char **more) 6844e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley{ 6944e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley struct { 7044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley char *name; 7144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley long flags; 7244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley } opts[] = { 7344e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley // NOPs (we autodetect --loop and --bind) 7444e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"loop", 0}, {"bind", 0}, {"defaults", 0}, {"quiet", 0}, 75e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley {"user", 0}, {"nouser", 0}, // checked in fstab, ignored in -o 7644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley// {"noauto", 0}, {"swap", 0}, 7744e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"ro", MS_RDONLY}, {"rw", ~MS_RDONLY}, 7844e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"nosuid", MS_NOSUID}, {"suid", ~MS_NOSUID}, 7944e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"nodev", MS_NODEV}, {"dev", ~MS_NODEV}, 8044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"noexec", MS_NOEXEC}, {"exec", ~MS_NOEXEC}, 8144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"sync", MS_SYNCHRONOUS}, {"async", ~MS_SYNCHRONOUS}, 8244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"noatime", MS_NOATIME}, {"atime", ~MS_NOATIME}, 8344e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"nodiratime", MS_NODIRATIME}, {"diratime", ~MS_NODIRATIME}, 8444e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"loud", ~MS_SILENT}, 8544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"shared", MS_SHARED}, {"rshared", MS_SHARED|MS_REC}, 8644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"slave", MS_SLAVE}, {"rslave", MS_SLAVE|MS_REC}, 8744e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"private", MS_PRIVATE}, {"rprivate", MS_SLAVE|MS_REC}, 8844e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley {"unbindable", MS_UNBINDABLE}, {"runbindable", MS_UNBINDABLE|MS_REC}, 89056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley {"remount", MS_REMOUNT}, {"move", MS_MOVE}, 9044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley // mand dirsync rec iversion strictatime 9144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley }; 9244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 93e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley if (new) for (;;) { 9444e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley char *comma = strchr(new, ','); 9544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley int i; 9644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 9744e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley if (comma) *comma = 0; 9844e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 9944e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley // If we recognize an option, apply flags 10044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley for (i = 0; i < ARRAY_LEN(opts); i++) if (!strcasecmp(opts[i].name, new)) { 10144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley long ll = opts[i].flags; 10244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 10344e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley if (ll < 0) flags &= ll; 10444e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley else flags |= ll; 10544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 10644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley break; 10744e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley } 10844e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 10944e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley // If we didn't recognize it, keep string version 11044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley if (more && i == ARRAY_LEN(opts)) { 11144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley i = *more ? strlen(*more) : 0; 11244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley *more = xrealloc(*more, i + strlen(new) + 2); 11344e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley if (i) (*more)[i++] = ','; 11444e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley strcpy(i+*more, new); 11544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley } 11644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 11744e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley if (!comma) break; 11844e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley *comma = ','; 11944e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley new = comma + 1; 12044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley } 12144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 12244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley return flags; 12344e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley} 12444e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 12544e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landleystatic void mount_filesystem(char *dev, char *dir, char *type, 12644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley unsigned long flags, char *opts) 127414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley{ 128414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley FILE *fp = 0; 129414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley int rc = EINVAL; 130414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 131414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley if (toys.optflags & FLAG_f) return; 132414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 133e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley if (getuid()) { 134e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley if (TT.okuser) TT.okuser = 0; 135e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley else { 136e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley error_msg("'%s' not user mountable in fstab"); 137e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley return; 138e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } 139e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } 140e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 141056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley // Autodetect bind mount or filesystem type 142cc3bf66666cb0d2c8937b1a60c2be8d3f5a49d04Rob Landley 143cc3bf66666cb0d2c8937b1a60c2be8d3f5a49d04Rob Landley if (type && !strcmp(type, "auto")) type = 0; 144cc3bf66666cb0d2c8937b1a60c2be8d3f5a49d04Rob Landley if (flags & MS_MOVE) { 145cc3bf66666cb0d2c8937b1a60c2be8d3f5a49d04Rob Landley if (type) error_exit("--move with -t"); 146cc3bf66666cb0d2c8937b1a60c2be8d3f5a49d04Rob Landley } else if (!type) { 14744e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley struct stat stdev, stdir; 14844e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 149e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley // file on file or dir on dir is a --bind mount. 150056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley if (!stat(dev, &stdev) && !stat(dir, &stdir) 151056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley && ((S_ISREG(stdev.st_mode) && S_ISREG(stdir.st_mode)) 152056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley || (S_ISDIR(stdev.st_mode) && S_ISDIR(stdir.st_mode)))) 153056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley { 154056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley flags |= MS_BIND; 155056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley } else fp = xfopen("/proc/filesystems", "r"); 156e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } else if (!strcmp(type, "ignore")) return; 157e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley else if (!strcmp(type, "swap")) 158e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley toys.exitval |= xpclose(xpopen((char *[]){"swapon", "--", dev, 0}, 0), 0); 159414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 160414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley for (;;) { 161414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley char *buf = 0; 162414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 163414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley // If type wasn't specified, try all of them in order. 164414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley if (fp) { 165414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley size_t i; 166414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 167414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley if (getline(&buf, &i, fp)<0) break; 168414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley type = buf; 169414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley // skip nodev devices 170414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley if (!isspace(*type)) { 171414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley free(buf); 172414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley continue; 173414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley } 174414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley // trim whitespace 175414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley while (isspace(*type)) type++; 176414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley i = strlen(type); 177414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley if (i) type[i-1] = 0; 178414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley } 17944e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley if (toys.optflags & FLAG_v) 18044e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley printf("try '%s' type '%s' on '%s'\n", dev, type, dir); 18172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley for (;;) { 18272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley rc = mount(dev, dir, type, flags, opts); 18372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if ((rc != EACCES && rc != EROFS) || (flags & MS_RDONLY)) break; 18472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley fprintf(stderr, "'%s' is read-only", dev); 18572e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley flags |= MS_RDONLY; 186056d0a00de99639fb39d19e984dd66fe82be7820Rob Landley } 187414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley free(buf); 18872e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 18925fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley if (!rc) break; 19025fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley 19125fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // Trying to autodetect loop mounts like bind mounts above (file on dir) 19225fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // isn't good enough because "mount -t ext2 fs.img dir" is valid, but if 19325fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // you _do_ accept loop mounts with -t how do you tell "-t cifs" isn't 19425fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // looking for a block device if it's not in /proc/filesystems yet 19525fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // because the module that won't be loaded until you try the mount, and 19625fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // if you can't then DEVICE existing as a file would cause a false 19725fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // positive loopback mount (so "touch servername" becomes a potential 19825fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // denial of service attack...) 19925fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // 20025fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // Solution: try the mount, let the kernel tell us it wanted a block 20125fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley // device, then do the loopback setup and retry the mount. 20225fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley 20325fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley if (fp && errno == EINVAL) continue; 20425fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley 20525fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley if (errno == ENOTBLK) { 20625fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley char *losetup[] = {"losetup", "-fs", dev, 0}; 20725fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley int pipes[2], len; 20825fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley pid_t pid; 20925fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley 21025fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley if (flags & MS_RDONLY) losetup[1] = "-fsr"; 21125fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley pid = xpopen(losetup, pipes); 21225fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley len = readall(pipes[1], toybuf, sizeof(toybuf)-1); 21325fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley rc = xpclose(pid, pipes); 21425fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley if (!rc && len > 1) { 21525fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley if (toybuf[len-1] == '\n') --len; 21625fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley toybuf[len] = 0; 21725fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley dev = toybuf; 21872e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 21925fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley continue; 22025fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley } else error_msg("losetup failed %d", rc); 22125fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley } else perror_msg("'%s'->'%s'", dev, dir); 22225fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley 22325fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley break; 224414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley } 225414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley if (fp) fclose(fp); 226414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley} 227414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 228414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landleyvoid mount_main(void) 229414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley{ 230e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley char *opts = 0, *dev = 0, *dir = 0, **ss; 23144e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley long flags = MS_SILENT; 23244e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley struct arg_list *o; 23372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley struct mtab_list *mtl, *mm, *remount = 0; 234414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 23572e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// remount 23672e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// - overmounts 23772e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// shared subtree 23872e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// -o parsed after fstab options 23972e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley// test if mountpoint already exists (-o noremount?) 24072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 24172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // First pass; just accumulate string, don't parse flags yet. (This is so 24272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // we can modify fstab entries with -a, or mtab with remount.) 24372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley for (o = TT.optlist; o; o = o->next) comma_collate(&opts, o->arg); 24472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (toys.optflags & FLAG_r) comma_collate(&opts, "ro"); 24572e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (toys.optflags & FLAG_w) comma_collate(&opts, "rw"); 24644e68a1bec9b342c01e2f4e6ccf9f1e7a3ee8081Rob Landley 247e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley // Treat each --option as -o option 248e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley for (ss = toys.optargs; *ss; ss++) { 24972e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley char *sss = *ss; 25072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 25172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // If you realy, really want to mount a file named "--", we support it. 25272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (sss[0]=='-' && sss[1]=='-' && sss[2]) comma_collate(&opts, sss+2); 25372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley else if (!dev) dev = sss; 25472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley else if (!dir) dir = sss; 255e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley // same message as lib/args.c ">2" which we can't use because --opts count 256e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley else error_exit("Max 2 arguments\n"); 257e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } 258414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 25972e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if ((toys.optflags & FLAG_a) && dir) error_exit("-a with >1 arg"); 26072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 26172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // For remount we need _last_ match (in case of overmounts), so traverse 26272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // in reverse order. 26372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (comma_scan(opts, "remount", 1)) 26472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley remount = dlist_terminate(mtl = xgetmountlist("/proc/mounts")); 265e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 266e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley // Do we need to do an /etc/fstab trawl? 26772e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // This covers -a, -o remount, one argument, all user mounts 26825fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley if ((toys.optflags & FLAG_a) || (dev && (!dir || getuid() || remount))) { 26972e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (!remount) mtl = xgetmountlist("/etc/fstab"); 27025fe0e0bea85f1d851ce03a90c0f1bf41ab431f2Rob Landley 27172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley for (mm = remount ? remount : mtl; mm; mm = (remount ? mm->prev : mm->next)) 272e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley { 27372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley int aflags, noauto, len; 27472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley char *aopts = 0; 275e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 27672e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // Check for noauto and get it out of the option list. (Unknown options 27772e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // that make it to the kernel give filesystem drivers indigestion.) 27872e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley noauto = comma_scan(mm->opts, "noauto", 1); 279e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley if (toys.optflags & FLAG_a) { 28072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // "mount -a /path" to mount all entries under /path 28172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (dev) { 28272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley len = strlen(dev); 28372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (strncmp(dev, mm->dir, len) 28472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley || (mm->dir[len] && mm->dir[len] != '/')) continue; 28572e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley } else if (noauto) continue; // never present in the remount case 28672e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (!mountlist_istype(mm,TT.type) || !comma_scanall(mm->opts,TT.bigO)) 287e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley continue; 288e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } else { 28972e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (dir && strcmp(dir, mm->dir)) continue; 29072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (dev && strcmp(dev, mm->device) && (dir || strcmp(dev, mm->dir))) 291e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley continue; 292e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } 293e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 294e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley // user only counts from fstab, not opts. 29572e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley TT.okuser = comma_scan(mm->opts, "user", 1); 29672e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley aflags = flag_opts(mm->opts, flags, &aopts); 29772e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley aflags = flag_opts(opts, aflags, &aopts); 298e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 29972e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley mount_filesystem(mm->device, mm->dir, mm->type, aflags, aopts); 300e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley free(aopts); 30172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 30272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (!(toys.optflags & FLAG_a)) break; 303e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley } 30472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (CFG_TOYBOX_FREE) llist_traverse(mtl, free); 305e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley 30672e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley // show mounts from /proc/mounts 30772e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley } else if (!dev) { 308e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley for (mtl = xgetmountlist(0); mtl && (mm = dlist_pop(&mtl)); free(mm)) { 309414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley char *s = 0; 310414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 311e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley if (TT.type && strcmp(TT.type, mm->type)) continue; 312e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley if (*mm->device == '/') s = xabspath(mm->device, 0); 313414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley xprintf("%s on %s type %s (%s)\n", 314e996bddf88a946a8ac8338c02e14add57e3d588cRob Landley s ? s : mm->device, mm->dir, mm->type, mm->opts); 315414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley free(s); 316414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley } 317414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley 318414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley // two arguments 31972e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley } else { 32072e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley char *more = 0; 32172e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley 32272e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley mount_filesystem(dev, dir, TT.type, flag_opts(opts, flags, &more), more); 32372e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley if (CFG_TOYBOX_FREE) free(more); 32472e84a2f3b758026dcb37abdb8c8383c9a07ec94Rob Landley } 325414c0cf9f5e91f7d755ba935595bbd7f3fd7c29eRob Landley} 326