mdmfs.c revision 114589
178447Sdd/* 280607Sdd * Copyright (c) 2001 Dima Dorfman. 378447Sdd * All rights reserved. 478447Sdd * 578447Sdd * Redistribution and use in source and binary forms, with or without 678447Sdd * modification, are permitted provided that the following conditions 778447Sdd * are met: 878447Sdd * 1. Redistributions of source code must retain the above copyright 978447Sdd * notice, this list of conditions and the following disclaimer. 1078447Sdd * 2. Redistributions in binary form must reproduce the above copyright 1178447Sdd * notice, this list of conditions and the following disclaimer in the 1278447Sdd * documentation and/or other materials provided with the distribution. 1378447Sdd * 1478447Sdd * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1578447Sdd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1678447Sdd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1778447Sdd * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1878447Sdd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1978447Sdd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2078447Sdd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2178447Sdd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2278447Sdd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2378447Sdd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2478447Sdd * SUCH DAMAGE. 2578447Sdd */ 2678447Sdd 2778447Sdd/* 28103798Sphk * mdmfs (md/MFS) is a wrapper around mdconfig(8), 2978447Sdd * newfs(8), and mount(8) that mimics the command line option set of 3078447Sdd * the deprecated mount_mfs(8). 3178447Sdd */ 3278447Sdd 33114589Sobrien#include <sys/cdefs.h> 34114589Sobrien__FBSDID("$FreeBSD: head/sbin/mdmfs/mdmfs.c 114589 2003-05-03 18:41:59Z obrien $"); 3578447Sdd 3678447Sdd#include <sys/param.h> 3778447Sdd#include <sys/mdioctl.h> 3878447Sdd#include <sys/stat.h> 3978447Sdd#include <sys/wait.h> 4078447Sdd 4178447Sdd#include <assert.h> 4278447Sdd#include <err.h> 4378447Sdd#include <fcntl.h> 4478447Sdd#include <grp.h> 4578447Sdd#include <paths.h> 4678447Sdd#include <pwd.h> 4778447Sdd#include <stdarg.h> 4878447Sdd#include <stdio.h> 4978447Sdd#include <stdlib.h> 5078447Sdd#include <string.h> 5178447Sdd#include <unistd.h> 5278447Sdd 5378447Sdd#include "pathnames.h" 5478447Sdd 5578447Sddtypedef enum { false, true } bool; 5678447Sdd 5778447Sddstruct mtpt_info { 5878447Sdd uid_t mi_uid; 5978447Sdd bool mi_have_uid; 6078447Sdd gid_t mi_gid; 6178447Sdd bool mi_have_gid; 6278447Sdd mode_t mi_mode; 6378447Sdd bool mi_have_mode; 6478447Sdd}; 6578447Sdd 6681742Sddstatic bool compat; /* Full compatibility with mount_mfs? */ 6778447Sddstatic bool debug; /* Emit debugging information? */ 6878447Sddstatic bool loudsubs; /* Suppress output from helper programs? */ 6978447Sddstatic bool norun; /* Actually run the helper programs? */ 7078447Sddstatic int unit; /* The unit we're working with. */ 7178447Sddstatic const char *mdname; /* Name of memory disk device (e.g., "md"). */ 7278447Sddstatic size_t mdnamelen; /* Length of mdname. */ 7378447Sdd 7479052Skrisstatic void argappend(char **, const char *, ...) __printflike(2, 3); 7579052Skrisstatic void debugprintf(const char *, ...) __printflike(1, 2); 7678447Sddstatic void do_mdconfig_attach(const char *, const enum md_types); 7778447Sddstatic void do_mdconfig_attach_au(const char *, const enum md_types); 7878447Sddstatic void do_mdconfig_detach(void); 7978447Sddstatic void do_mount(const char *, const char *); 8078447Sddstatic void do_mtptsetup(const char *, struct mtpt_info *); 8178447Sddstatic void do_newfs(const char *); 8278447Sddstatic void extract_ugid(const char *, struct mtpt_info *); 8379052Skrisstatic int run(int *, const char *, ...) __printflike(2, 3); 8478447Sddstatic void usage(void); 8578447Sdd 8678447Sddint 8781628Sobrienmain(int argc, char **argv) 8878447Sdd{ 8978447Sdd struct mtpt_info mi; /* Mountpoint info. */ 9078447Sdd char *mdconfig_arg, *newfs_arg, /* Args to helper programs. */ 9178447Sdd *mount_arg; 9278447Sdd enum md_types mdtype; /* The type of our memory disk. */ 9378447Sdd bool have_mdtype; 9478447Sdd bool detach, softdep, autounit; 9578447Sdd char *mtpoint, *unitstr; 9678447Sdd char ch, *p; 9778447Sdd 9878447Sdd /* Misc. initialization. */ 9978447Sdd (void)memset(&mi, '\0', sizeof(mi)); 10078447Sdd detach = true; 10178447Sdd softdep = true; 10278447Sdd autounit = false; 10378447Sdd have_mdtype = false; 10478447Sdd mdname = MD_NAME; 10578447Sdd mdnamelen = strlen(mdname); 10678447Sdd /* 10778447Sdd * Can't set these to NULL. They may be passed to the 10878447Sdd * respective programs without modification. I.e., we may not 10978447Sdd * receive any command-line options which will caused them to 11078447Sdd * be modified. 11178447Sdd */ 11278447Sdd mdconfig_arg = strdup(""); 11378447Sdd newfs_arg = strdup(""); 11478447Sdd mount_arg = strdup(""); 11578447Sdd 11684167Siedowse /* If we were started as mount_mfs or mfs, imply -C. */ 11784167Siedowse if (strcmp(getprogname(), "mount_mfs") == 0 || 11884167Siedowse strcmp(getprogname(), "mfs") == 0) 11981742Sdd compat = true; 12081742Sdd 12181628Sobrien while ((ch = getopt(argc, argv, 122107475Srwatson "a:b:Cc:Dd:e:F:f:hi:LMm:Nn:O:o:p:Ss:t:Uv:w:X")) != -1) 12378447Sdd switch (ch) { 12478447Sdd case 'a': 12578447Sdd argappend(&newfs_arg, "-a %s", optarg); 12678447Sdd break; 12778447Sdd case 'b': 12878447Sdd argappend(&newfs_arg, "-b %s", optarg); 12978447Sdd break; 13081742Sdd case 'C': 13181742Sdd if (compat) 13281742Sdd usage(); 13381742Sdd compat = true; 13481742Sdd break; 13578447Sdd case 'c': 13678447Sdd argappend(&newfs_arg, "-c %s", optarg); 13778447Sdd break; 13878447Sdd case 'D': 13981742Sdd if (compat) 14081742Sdd usage(); 14178447Sdd detach = false; 14278447Sdd break; 14378447Sdd case 'd': 14478447Sdd argappend(&newfs_arg, "-d %s", optarg); 14578447Sdd break; 14678447Sdd case 'e': 14778447Sdd argappend(&newfs_arg, "-e %s", optarg); 14878447Sdd break; 14978447Sdd case 'F': 15078447Sdd if (have_mdtype) 15178447Sdd usage(); 15278447Sdd mdtype = MD_VNODE; 15378447Sdd have_mdtype = true; 15478447Sdd argappend(&mdconfig_arg, "-f %s", optarg); 15578447Sdd break; 15678447Sdd case 'f': 15778447Sdd argappend(&newfs_arg, "-f %s", optarg); 15878447Sdd break; 15978447Sdd case 'h': 16078447Sdd usage(); 16178447Sdd break; 16278447Sdd case 'i': 16378447Sdd argappend(&newfs_arg, "-i %s", optarg); 16478447Sdd break; 16578447Sdd case 'L': 16681742Sdd if (compat) 16781742Sdd usage(); 16878447Sdd loudsubs = true; 16978447Sdd break; 17078447Sdd case 'M': 17178447Sdd if (have_mdtype) 17278447Sdd usage(); 17378447Sdd mdtype = MD_MALLOC; 17478447Sdd have_mdtype = true; 17578447Sdd break; 17678447Sdd case 'm': 17778447Sdd argappend(&newfs_arg, "-m %s", optarg); 17878447Sdd break; 17978447Sdd case 'N': 18081742Sdd if (compat) 18181742Sdd usage(); 18278447Sdd norun = true; 18378447Sdd break; 18478447Sdd case 'n': 18578447Sdd argappend(&newfs_arg, "-n %s", optarg); 18678447Sdd break; 18778447Sdd case 'O': 18878447Sdd argappend(&newfs_arg, "-o %s", optarg); 18978447Sdd break; 19078447Sdd case 'o': 19178447Sdd argappend(&mount_arg, "-o %s", optarg); 19278447Sdd break; 19378447Sdd case 'p': 19481742Sdd if (compat) 19581742Sdd usage(); 19678447Sdd if (*optarg >= '0' && *optarg <= '7') 19778447Sdd mi.mi_mode = strtol(optarg, NULL, 8); 19878447Sdd if ((mi.mi_mode & ~07777) != 0) 19978447Sdd usage(); 20078447Sdd mi.mi_have_mode = true; 20178447Sdd break; 20278447Sdd case 'S': 20381742Sdd if (compat) 20481742Sdd usage(); 20578447Sdd softdep = false; 20678447Sdd break; 20778447Sdd case 's': 20878447Sdd argappend(&mdconfig_arg, "-s %s", optarg); 20978447Sdd break; 21081742Sdd case 'U': 21181742Sdd softdep = true; 21281742Sdd break; 213107475Srwatson case 'v': 214107475Srwatson argappend(&newfs_arg, "-O %s", optarg); 215107475Srwatson break; 21678447Sdd case 'w': 21781742Sdd if (compat) 21881742Sdd usage(); 21978447Sdd extract_ugid(optarg, &mi); 22078447Sdd break; 22178447Sdd case 'X': 22281742Sdd if (compat) 22381742Sdd usage(); 22478447Sdd debug = true; 22578447Sdd break; 22678447Sdd default: 22778447Sdd usage(); 22878447Sdd } 22981628Sobrien argc -= optind; 23081628Sobrien argv += optind; 23181628Sobrien if (argc < 2) 23278447Sdd usage(); 23378447Sdd 23481742Sdd /* Make compatibility assumptions. */ 23581742Sdd if (compat) { 23681742Sdd mi.mi_mode = 01777; 23781742Sdd mi.mi_have_mode = true; 23881742Sdd } 23981742Sdd 24078447Sdd /* Derive 'unit' (global). */ 24181628Sobrien unitstr = argv[0]; 24278447Sdd if (strncmp(unitstr, "/dev/", 5) == 0) 24378447Sdd unitstr += 5; 24478447Sdd if (strncmp(unitstr, mdname, mdnamelen) == 0) 24578447Sdd unitstr += mdnamelen; 24678447Sdd if (*unitstr == '\0') { 24778447Sdd autounit = true; 24878447Sdd unit = -1; 24978447Sdd } else { 25078447Sdd unit = strtoul(unitstr, &p, 10); 25178447Sdd if ((unsigned)unit == ULONG_MAX || *p != '\0') 25278447Sdd errx(1, "bad device unit: %s", unitstr); 25378447Sdd } 25478447Sdd 25581628Sobrien mtpoint = argv[1]; 25678447Sdd if (!have_mdtype) 25778447Sdd mdtype = MD_SWAP; 25878447Sdd if (softdep) 25978447Sdd argappend(&newfs_arg, "-U"); 26078447Sdd 26178447Sdd /* Do the work. */ 26278447Sdd if (detach && !autounit) 26378447Sdd do_mdconfig_detach(); 26478447Sdd if (autounit) 26578447Sdd do_mdconfig_attach_au(mdconfig_arg, mdtype); 26678447Sdd else 26778447Sdd do_mdconfig_attach(mdconfig_arg, mdtype); 26878447Sdd do_newfs(newfs_arg); 26978447Sdd do_mount(mount_arg, mtpoint); 27078447Sdd do_mtptsetup(mtpoint, &mi); 27178447Sdd 27278447Sdd return (0); 27378447Sdd} 27478447Sdd 27578447Sdd/* 27678447Sdd * Append the expansion of 'fmt' to the buffer pointed to by '*dstp'; 27778447Sdd * reallocate as required. 27878447Sdd */ 27978447Sddstatic void 28078447Sddargappend(char **dstp, const char *fmt, ...) 28178447Sdd{ 28278447Sdd char *old, *new; 28378447Sdd va_list ap; 28478447Sdd 28578447Sdd old = *dstp; 28678447Sdd assert(old != NULL); 28778447Sdd 28878447Sdd va_start(ap, fmt); 28978447Sdd if (vasprintf(&new, fmt,ap) == -1) 29078447Sdd errx(1, "vasprintf"); 29178447Sdd va_end(ap); 29278447Sdd 29378447Sdd *dstp = new; 29478447Sdd if (asprintf(&new, "%s %s", old, new) == -1) 29578447Sdd errx(1, "asprintf"); 29678447Sdd free(*dstp); 29778447Sdd free(old); 29878447Sdd 29978447Sdd *dstp = new; 30078447Sdd} 30178447Sdd 30278447Sdd/* 30378447Sdd * If run-time debugging is enabled, print the expansion of 'fmt'. 30478447Sdd * Otherwise, do nothing. 30578447Sdd */ 30678447Sddstatic void 30778447Sdddebugprintf(const char *fmt, ...) 30878447Sdd{ 30978447Sdd va_list ap; 31078447Sdd 31178447Sdd if (!debug) 31278447Sdd return; 31378447Sdd fprintf(stderr, "DEBUG: "); 31478447Sdd va_start(ap, fmt); 31578447Sdd vfprintf(stderr, fmt, ap); 31678447Sdd va_end(ap); 31778447Sdd fprintf(stderr, "\n"); 31878447Sdd fflush(stderr); 31978447Sdd} 32078447Sdd 32178447Sdd/* 32278447Sdd * Attach a memory disk with a known unit. 32378447Sdd */ 32478447Sddstatic void 32578447Sdddo_mdconfig_attach(const char *args, const enum md_types mdtype) 32678447Sdd{ 32778447Sdd int rv; 32878447Sdd const char *ta; /* Type arg. */ 32978447Sdd 33078447Sdd switch (mdtype) { 33178447Sdd case MD_SWAP: 33278447Sdd ta = "-t swap"; 33378447Sdd break; 33478447Sdd case MD_VNODE: 33578447Sdd ta = "-t vnode"; 33678447Sdd break; 33778447Sdd case MD_MALLOC: 33878447Sdd ta = "-t malloc"; 33978447Sdd break; 34078447Sdd default: 34178447Sdd abort(); 34278447Sdd } 34378447Sdd rv = run(NULL, "%s -a %s%s -u %s%d", PATH_MDCONFIG, ta, args, 34478447Sdd mdname, unit); 34578447Sdd if (rv) 34678447Sdd errx(1, "mdconfig (attach) exited with error code %d", rv); 34778447Sdd} 34878447Sdd 34978447Sdd/* 35078447Sdd * Attach a memory disk with an unknown unit; use autounit. 35178447Sdd */ 35278447Sddstatic void 35378447Sdddo_mdconfig_attach_au(const char *args, const enum md_types mdtype) 35478447Sdd{ 35578447Sdd const char *ta; /* Type arg. */ 35678447Sdd char *linep, *linebuf; /* Line pointer, line buffer. */ 35778447Sdd int fd; /* Standard output of mdconfig invocation. */ 35878447Sdd FILE *sfd; 35978447Sdd int rv; 36078447Sdd char *p; 36178447Sdd size_t linelen; 36278447Sdd 36378447Sdd switch (mdtype) { 36478447Sdd case MD_SWAP: 36578447Sdd ta = "-t swap"; 36678447Sdd break; 36778447Sdd case MD_VNODE: 36878447Sdd ta = "-t vnode"; 36978447Sdd break; 37078447Sdd case MD_MALLOC: 37178447Sdd ta = "-t malloc"; 37278447Sdd break; 37378447Sdd default: 37478447Sdd abort(); 37578447Sdd } 37678447Sdd rv = run(&fd, "%s -a %s%s", PATH_MDCONFIG, ta, args); 37778447Sdd if (rv) 37878447Sdd errx(1, "mdconfig (attach) exited with error code %d", rv); 37978447Sdd 38078447Sdd /* Receive the unit number. */ 38178447Sdd if (norun) { /* Since we didn't run, we can't read. Fake it. */ 38278447Sdd unit = -1; 38378447Sdd return; 38478447Sdd } 38578447Sdd sfd = fdopen(fd, "r"); 38678447Sdd if (sfd == NULL) 38778447Sdd err(1, "fdopen"); 38878447Sdd linep = fgetln(sfd, &linelen); 38978447Sdd if (linep == NULL && linelen < mdnamelen + 1) 39078447Sdd errx(1, "unexpected output from mdconfig (attach)"); 39178447Sdd /* If the output format changes, we want to know about it. */ 39278447Sdd assert(strncmp(linep, mdname, mdnamelen) == 0); 39378447Sdd linebuf = malloc(linelen - mdnamelen + 1); 39478447Sdd assert(linebuf != NULL); 39578447Sdd /* Can't use strlcpy because linep is not NULL-terminated. */ 39678447Sdd strncpy(linebuf, linep + mdnamelen, linelen); 39778447Sdd linebuf[linelen] = '\0'; 39878447Sdd unit = strtoul(linebuf, &p, 10); 39978447Sdd if ((unsigned)unit == ULONG_MAX || *p != '\n') 40078447Sdd errx(1, "unexpected output from mdconfig (attach)"); 40178447Sdd 40278447Sdd fclose(sfd); 40378447Sdd close(fd); 40478447Sdd} 40578447Sdd 40678447Sdd/* 40778447Sdd * Detach a memory disk. 40878447Sdd */ 40978447Sddstatic void 41078447Sdddo_mdconfig_detach(void) 41178447Sdd{ 41278447Sdd int rv; 41378447Sdd 41478447Sdd rv = run(NULL, "%s -d -u %s%d", PATH_MDCONFIG, mdname, unit); 41578447Sdd if (rv && debug) /* This is allowed to fail. */ 41678447Sdd warnx("mdconfig (detach) exited with error code %d (ignored)", 41778447Sdd rv); 41878447Sdd} 41978447Sdd 42078447Sdd/* 42178447Sdd * Mount the configured memory disk. 42278447Sdd */ 42378447Sddstatic void 42478447Sdddo_mount(const char *args, const char *mtpoint) 42578447Sdd{ 42678447Sdd int rv; 42778447Sdd 428103798Sphk rv = run(NULL, "%s%s /dev/%s%d %s", PATH_MOUNT, args, 42978447Sdd mdname, unit, mtpoint); 43078447Sdd if (rv) 43178447Sdd errx(1, "mount exited with error code %d", rv); 43278447Sdd} 43378447Sdd 43478447Sdd/* 43578447Sdd * Various configuration of the mountpoint. Mostly, enact 'mip'. 43678447Sdd */ 43778447Sddstatic void 43878447Sdddo_mtptsetup(const char *mtpoint, struct mtpt_info *mip) 43978447Sdd{ 44078447Sdd 44178447Sdd if (mip->mi_have_mode) { 44278447Sdd debugprintf("changing mode of %s to %o.", mtpoint, 44378447Sdd mip->mi_mode); 44478447Sdd if (!norun) 44578447Sdd if (chmod(mtpoint, mip->mi_mode) == -1) 44678447Sdd err(1, "chmod: %s", mtpoint); 44778447Sdd } 44878447Sdd /* 44978447Sdd * We have to do these separately because the user may have 45078447Sdd * only specified one of them. 45178447Sdd */ 45278447Sdd if (mip->mi_have_uid) { 45378447Sdd debugprintf("changing owner (user) or %s to %u.", mtpoint, 45478447Sdd mip->mi_uid); 45578447Sdd if (!norun) 45678447Sdd if (chown(mtpoint, mip->mi_uid, -1) == -1) 45778447Sdd err(1, "chown %s to %u (user)", mtpoint, 45878447Sdd mip->mi_uid); 45978447Sdd } 46078447Sdd if (mip->mi_have_gid) { 46178447Sdd debugprintf("changing owner (group) or %s to %u.", mtpoint, 46278447Sdd mip->mi_gid); 46378447Sdd if (!norun) 46478447Sdd if (chown(mtpoint, -1, mip->mi_gid) == -1) 46578447Sdd err(1, "chown %s to %u (group)", mtpoint, 46678447Sdd mip->mi_gid); 46778447Sdd } 46878447Sdd} 46978447Sdd 47078447Sdd/* 471102231Strhodes * Put a file system on the memory disk. 47278447Sdd */ 47378447Sddstatic void 47478447Sdddo_newfs(const char *args) 47578447Sdd{ 47678447Sdd int rv; 47778447Sdd 478103798Sphk rv = run(NULL, "%s%s /dev/%s%d", PATH_NEWFS, args, mdname, unit); 47978447Sdd if (rv) 48078447Sdd errx(1, "newfs exited with error code %d", rv); 48178447Sdd} 48278447Sdd 48378447Sdd/* 48478447Sdd * 'str' should be a user and group name similar to the last argument 48578447Sdd * to chown(1); i.e., a user, followed by a colon, followed by a 48678447Sdd * group. The user and group in 'str' may be either a [ug]id or a 48778447Sdd * name. Upon return, the uid and gid fields in 'mip' will contain 48878447Sdd * the uid and gid of the user and group name in 'str', respectively. 48978447Sdd * 49078447Sdd * In other words, this derives a user and group id from a string 49178447Sdd * formatted like the last argument to chown(1). 49278447Sdd */ 49378447Sddstatic void 49478447Sddextract_ugid(const char *str, struct mtpt_info *mip) 49578447Sdd{ 49678447Sdd char *ug; /* Writable 'str'. */ 49778447Sdd char *user, *group; /* Result of extracton. */ 49878447Sdd struct passwd *pw; 49978447Sdd struct group *gr; 50078447Sdd char *p; 50178447Sdd uid_t *uid; 50278447Sdd gid_t *gid; 50378447Sdd 50478447Sdd uid = &mip->mi_uid; 50578447Sdd gid = &mip->mi_gid; 50678447Sdd mip->mi_have_uid = mip->mi_have_gid = false; 50778447Sdd 50878447Sdd /* Extract the user and group from 'str'. Format above. */ 50978711Sdd ug = strdup(str); 51078447Sdd assert(ug != NULL); 51178447Sdd group = ug; 51278447Sdd user = strsep(&group, ":"); 51378447Sdd if (user == NULL || group == NULL || *user == '\0' || *group == '\0') 51478447Sdd usage(); 51578447Sdd 51678447Sdd /* Derive uid. */ 51778447Sdd *uid = strtoul(user, &p, 10); 51878447Sdd if ((unsigned)*uid == ULONG_MAX) 51978447Sdd usage(); 52078447Sdd if (*p != '\0') { 52178447Sdd pw = getpwnam(user); 52278447Sdd if (pw == NULL) 52378447Sdd errx(1, "invalid user: %s", user); 52478447Sdd *uid = pw->pw_uid; 52578447Sdd mip->mi_have_uid = true; 52678447Sdd } 52778447Sdd 52878447Sdd /* Derive gid. */ 52978447Sdd *gid = strtoul(group, &p, 10); 53078447Sdd if ((unsigned)*gid == ULONG_MAX) 53178447Sdd usage(); 53278447Sdd if (*p != '\0') { 53378447Sdd gr = getgrnam(group); 53478447Sdd if (gr == NULL) 53578447Sdd errx(1, "invalid group: %s", group); 53678447Sdd *gid = gr->gr_gid; 53778447Sdd mip->mi_have_gid = true; 53878447Sdd } 53978447Sdd 54078447Sdd free(ug); 54178447Sdd /* 54278447Sdd * At this point we don't support only a username or only a 54378447Sdd * group name. do_mtptsetup already does, so when this 54478447Sdd * feature is desired, this is the only routine that needs to 54578447Sdd * be changed. 54678447Sdd */ 54778447Sdd assert(mip->mi_have_uid); 54878447Sdd assert(mip->mi_have_gid); 54978447Sdd} 55078447Sdd 55178447Sdd/* 55278447Sdd * Run a process with command name and arguments pointed to by the 55378447Sdd * formatted string 'cmdline'. Since system(3) is not used, the first 55478447Sdd * space-delimited token of 'cmdline' must be the full pathname of the 55578447Sdd * program to run. The return value is the return code of the process 55678447Sdd * spawned. If 'ofd' is non-NULL, it is set to the standard output of 55778447Sdd * the program spawned (i.e., you can read from ofd and get the output 55878447Sdd * of the program). 55978447Sdd */ 56078447Sddstatic int 56178447Sddrun(int *ofd, const char *cmdline, ...) 56278447Sdd{ 56381628Sobrien char **argv, **argvp; /* Result of splitting 'cmd'. */ 56481628Sobrien int argc; 56578447Sdd char *cmd; /* Expansion of 'cmdline'. */ 56678447Sdd int pid, status; /* Child info. */ 56778447Sdd int pfd[2]; /* Pipe to the child. */ 56878447Sdd int nfd; /* Null (/dev/null) file descriptor. */ 56978447Sdd bool dup2dn; /* Dup /dev/null to stdout? */ 57078447Sdd va_list ap; 57178447Sdd char *p; 57278447Sdd int rv, i; 57378447Sdd 57478447Sdd dup2dn = true; 57578447Sdd va_start(ap, cmdline); 57678447Sdd rv = vasprintf(&cmd, cmdline, ap); 57778447Sdd if (rv == -1) 57878447Sdd err(1, "vasprintf"); 57978447Sdd va_end(ap); 58078447Sdd 58181628Sobrien /* Split up 'cmd' into 'argv' for use with execve. */ 58281628Sobrien for (argc = 1, p = cmd; (p = strchr(p, ' ')) != NULL; p++) 58381628Sobrien argc++; /* 'argc' generation loop. */ 58481628Sobrien argv = (char **)malloc(sizeof(*argv) * (argc + 1)); 58581628Sobrien assert(argv != NULL); 58681628Sobrien for (p = cmd, argvp = argv; (*argvp = strsep(&p, " ")) != NULL;) 58781628Sobrien if (**argv != '\0') 58881628Sobrien if (++argvp >= &argv[argc]) { 58981628Sobrien *argvp = NULL; 59078447Sdd break; 59178447Sdd } 59281628Sobrien assert(*argv); 59378447Sdd 59478447Sdd /* Make sure the above loop works as expected. */ 59578447Sdd if (debug) { 59678447Sdd /* 59778447Sdd * We can't, but should, use debugprintf here. First, 59878447Sdd * it appends a trailing newline to the output, and 59978447Sdd * second it prepends "DEBUG: " to the output. The 60078447Sdd * former is a problem for this would-be first call, 60178447Sdd * and the latter for the would-be call inside the 60278447Sdd * loop. 60378447Sdd */ 60478447Sdd (void)fprintf(stderr, "DEBUG: running:"); 60578447Sdd /* Should be equivilent to 'cmd' (before strsep, of course). */ 60681628Sobrien for (i = 0; argv[i] != NULL; i++) 60781628Sobrien (void)fprintf(stderr, " %s", argv[i]); 60878447Sdd (void)fprintf(stderr, "\n"); 60978447Sdd } 61078447Sdd 61178447Sdd /* Create a pipe if necessary and fork the helper program. */ 61278447Sdd if (ofd != NULL) { 61378447Sdd if (pipe(&pfd[0]) == -1) 61478447Sdd err(1, "pipe"); 61578447Sdd *ofd = pfd[0]; 61678447Sdd dup2dn = false; 61778447Sdd } 61878447Sdd pid = fork(); 61978447Sdd switch (pid) { 62078447Sdd case 0: 62178447Sdd /* XXX can we call err() in here? */ 62278447Sdd if (norun) 62378447Sdd _exit(0); 62478447Sdd if (ofd != NULL) 62578447Sdd if (dup2(pfd[1], STDOUT_FILENO) < 0) 62678447Sdd err(1, "dup2"); 62778447Sdd if (!loudsubs) { 62878447Sdd nfd = open(_PATH_DEVNULL, O_RDWR); 62978447Sdd if (nfd == -1) 63078447Sdd err(1, "open: %s", _PATH_DEVNULL); 63178447Sdd if (dup2(nfd, STDIN_FILENO) < 0) 63278447Sdd err(1, "dup2"); 63378447Sdd if (dup2dn) 63478447Sdd if (dup2(nfd, STDOUT_FILENO) < 0) 63578447Sdd err(1, "dup2"); 63678447Sdd if (dup2(nfd, STDERR_FILENO) < 0) 63778447Sdd err(1, "dup2"); 63878447Sdd } 63978447Sdd 64081628Sobrien (void)execv(argv[0], argv); 64181628Sobrien warn("exec: %s", argv[0]); 64278447Sdd _exit(-1); 64378447Sdd case -1: 64478447Sdd err(1, "fork"); 64578447Sdd } 64678447Sdd 64778447Sdd free(cmd); 64881628Sobrien free(argv); 64978447Sdd while (waitpid(pid, &status, 0) != pid) 65078447Sdd ; 65178447Sdd return (WEXITSTATUS(status)); 65278447Sdd} 65378447Sdd 65478447Sddstatic void 65578447Sddusage(void) 65678447Sdd{ 65781742Sdd const char *name; 65878447Sdd 65981742Sdd if (compat) 66081742Sdd name = getprogname(); 66181742Sdd else 66281742Sdd name = "mdmfs"; 66381742Sdd if (!compat) 66481742Sdd fprintf(stderr, 66595258Sdes"usage: %s [-DLMNSUX] [-a maxcontig [-b block-size] [-c cylinders]\n" 66681742Sdd"\t[-d rotdelay] [-e maxbpg] [-F file] [-f frag-size] [-i bytes]\n" 66781742Sdd"\t[-m percent-free] [-n rotational-positions] [-O optimization]\n" 66881742Sdd"\t[-o mount-options] [-p permissions] [-s size] [-w user:group]\n" 66981742Sdd"\tmd-device mount-point\n", name); 67078447Sdd fprintf(stderr, 67195258Sdes"usage: %s -C [-NU] [-a maxcontig] [-b block-size] [-c cylinders]\n" 67278447Sdd"\t[-d rotdelay] [-e maxbpg] [-F file] [-f frag-size] [-i bytes]\n" 67378447Sdd"\t[-m percent-free] [-n rotational-positions] [-O optimization]\n" 67481742Sdd"\t[-o mount-options] [-s size] md-device mount-point\n", name); 67578447Sdd exit(1); 67678447Sdd} 677