mdmfs.c revision 95258
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/* 2878447Sdd * mdmfs (md/MFS) is a wrapper around mdconfig(8), disklabel(8), 2978447Sdd * newfs(8), and mount(8) that mimics the command line option set of 3078447Sdd * the deprecated mount_mfs(8). 3178447Sdd */ 3278447Sdd 3378447Sdd#ifndef lint 3478447Sddstatic const char rcsid[] = 3578447Sdd "$FreeBSD: head/sbin/mdmfs/mdmfs.c 95258 2002-04-22 13:44:47Z des $"; 3678447Sdd#endif /* not lint */ 3778447Sdd 3878447Sdd#include <sys/param.h> 3978447Sdd#include <sys/mdioctl.h> 4078447Sdd#include <sys/stat.h> 4178447Sdd#include <sys/wait.h> 4278447Sdd 4378447Sdd#include <assert.h> 4478447Sdd#include <err.h> 4578447Sdd#include <fcntl.h> 4678447Sdd#include <grp.h> 4778447Sdd#include <paths.h> 4878447Sdd#include <pwd.h> 4978447Sdd#include <stdarg.h> 5078447Sdd#include <stdio.h> 5178447Sdd#include <stdlib.h> 5278447Sdd#include <string.h> 5378447Sdd#include <unistd.h> 5478447Sdd 5578447Sdd#include "pathnames.h" 5678447Sdd 5778447Sddtypedef enum { false, true } bool; 5878447Sdd 5978447Sddstruct mtpt_info { 6078447Sdd uid_t mi_uid; 6178447Sdd bool mi_have_uid; 6278447Sdd gid_t mi_gid; 6378447Sdd bool mi_have_gid; 6478447Sdd mode_t mi_mode; 6578447Sdd bool mi_have_mode; 6678447Sdd}; 6778447Sdd 6881742Sddstatic bool compat; /* Full compatibility with mount_mfs? */ 6978447Sddstatic bool debug; /* Emit debugging information? */ 7078447Sddstatic bool loudsubs; /* Suppress output from helper programs? */ 7178447Sddstatic bool norun; /* Actually run the helper programs? */ 7278447Sddstatic int unit; /* The unit we're working with. */ 7378447Sddstatic const char *mdname; /* Name of memory disk device (e.g., "md"). */ 7478447Sddstatic size_t mdnamelen; /* Length of mdname. */ 7578447Sdd 7679052Skrisstatic void argappend(char **, const char *, ...) __printflike(2, 3); 7779052Skrisstatic void debugprintf(const char *, ...) __printflike(1, 2); 7878447Sddstatic void do_disklabel(void); 7978447Sddstatic void do_mdconfig_attach(const char *, const enum md_types); 8078447Sddstatic void do_mdconfig_attach_au(const char *, const enum md_types); 8178447Sddstatic void do_mdconfig_detach(void); 8278447Sddstatic void do_mount(const char *, const char *); 8378447Sddstatic void do_mtptsetup(const char *, struct mtpt_info *); 8478447Sddstatic void do_newfs(const char *); 8578447Sddstatic void extract_ugid(const char *, struct mtpt_info *); 8679052Skrisstatic int run(int *, const char *, ...) __printflike(2, 3); 8778447Sddstatic void usage(void); 8878447Sdd 8978447Sddint 9081628Sobrienmain(int argc, char **argv) 9178447Sdd{ 9278447Sdd struct mtpt_info mi; /* Mountpoint info. */ 9378447Sdd char *mdconfig_arg, *newfs_arg, /* Args to helper programs. */ 9478447Sdd *mount_arg; 9578447Sdd enum md_types mdtype; /* The type of our memory disk. */ 9678447Sdd bool have_mdtype; 9778447Sdd bool detach, softdep, autounit; 9878447Sdd char *mtpoint, *unitstr; 9978447Sdd char ch, *p; 10078447Sdd 10178447Sdd /* Misc. initialization. */ 10278447Sdd (void)memset(&mi, '\0', sizeof(mi)); 10378447Sdd detach = true; 10478447Sdd softdep = true; 10578447Sdd autounit = false; 10678447Sdd have_mdtype = false; 10778447Sdd mdname = MD_NAME; 10878447Sdd mdnamelen = strlen(mdname); 10978447Sdd /* 11078447Sdd * Can't set these to NULL. They may be passed to the 11178447Sdd * respective programs without modification. I.e., we may not 11278447Sdd * receive any command-line options which will caused them to 11378447Sdd * be modified. 11478447Sdd */ 11578447Sdd mdconfig_arg = strdup(""); 11678447Sdd newfs_arg = strdup(""); 11778447Sdd mount_arg = strdup(""); 11878447Sdd 11984167Siedowse /* If we were started as mount_mfs or mfs, imply -C. */ 12084167Siedowse if (strcmp(getprogname(), "mount_mfs") == 0 || 12184167Siedowse strcmp(getprogname(), "mfs") == 0) 12281742Sdd compat = true; 12381742Sdd 12481628Sobrien while ((ch = getopt(argc, argv, 12581742Sdd "a:b:Cc:Dd:e:F:f:hi:LMm:Nn:O:o:p:Ss:t:Uw:X")) != -1) 12678447Sdd switch (ch) { 12778447Sdd case 'a': 12878447Sdd argappend(&newfs_arg, "-a %s", optarg); 12978447Sdd break; 13078447Sdd case 'b': 13178447Sdd argappend(&newfs_arg, "-b %s", optarg); 13278447Sdd break; 13381742Sdd case 'C': 13481742Sdd if (compat) 13581742Sdd usage(); 13681742Sdd compat = true; 13781742Sdd break; 13878447Sdd case 'c': 13978447Sdd argappend(&newfs_arg, "-c %s", optarg); 14078447Sdd break; 14178447Sdd case 'D': 14281742Sdd if (compat) 14381742Sdd usage(); 14478447Sdd detach = false; 14578447Sdd break; 14678447Sdd case 'd': 14778447Sdd argappend(&newfs_arg, "-d %s", optarg); 14878447Sdd break; 14978447Sdd case 'e': 15078447Sdd argappend(&newfs_arg, "-e %s", optarg); 15178447Sdd break; 15278447Sdd case 'F': 15378447Sdd if (have_mdtype) 15478447Sdd usage(); 15578447Sdd mdtype = MD_VNODE; 15678447Sdd have_mdtype = true; 15778447Sdd argappend(&mdconfig_arg, "-f %s", optarg); 15878447Sdd break; 15978447Sdd case 'f': 16078447Sdd argappend(&newfs_arg, "-f %s", optarg); 16178447Sdd break; 16278447Sdd case 'h': 16378447Sdd usage(); 16478447Sdd break; 16578447Sdd case 'i': 16678447Sdd argappend(&newfs_arg, "-i %s", optarg); 16778447Sdd break; 16878447Sdd case 'L': 16981742Sdd if (compat) 17081742Sdd usage(); 17178447Sdd loudsubs = true; 17278447Sdd break; 17378447Sdd case 'M': 17478447Sdd if (have_mdtype) 17578447Sdd usage(); 17678447Sdd mdtype = MD_MALLOC; 17778447Sdd have_mdtype = true; 17878447Sdd break; 17978447Sdd case 'm': 18078447Sdd argappend(&newfs_arg, "-m %s", optarg); 18178447Sdd break; 18278447Sdd case 'N': 18381742Sdd if (compat) 18481742Sdd usage(); 18578447Sdd norun = true; 18678447Sdd break; 18778447Sdd case 'n': 18878447Sdd argappend(&newfs_arg, "-n %s", optarg); 18978447Sdd break; 19078447Sdd case 'O': 19178447Sdd argappend(&newfs_arg, "-o %s", optarg); 19278447Sdd break; 19378447Sdd case 'o': 19478447Sdd argappend(&mount_arg, "-o %s", optarg); 19578447Sdd break; 19678447Sdd case 'p': 19781742Sdd if (compat) 19881742Sdd usage(); 19978447Sdd if (*optarg >= '0' && *optarg <= '7') 20078447Sdd mi.mi_mode = strtol(optarg, NULL, 8); 20178447Sdd if ((mi.mi_mode & ~07777) != 0) 20278447Sdd usage(); 20378447Sdd mi.mi_have_mode = true; 20478447Sdd break; 20578447Sdd case 'S': 20681742Sdd if (compat) 20781742Sdd usage(); 20878447Sdd softdep = false; 20978447Sdd break; 21078447Sdd case 's': 21178447Sdd argappend(&mdconfig_arg, "-s %s", optarg); 21278447Sdd break; 21381742Sdd case 'U': 21481742Sdd softdep = true; 21581742Sdd 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_disklabel(); 26978447Sdd do_newfs(newfs_arg); 27078447Sdd do_mount(mount_arg, mtpoint); 27178447Sdd do_mtptsetup(mtpoint, &mi); 27278447Sdd 27378447Sdd return (0); 27478447Sdd} 27578447Sdd 27678447Sdd/* 27778447Sdd * Append the expansion of 'fmt' to the buffer pointed to by '*dstp'; 27878447Sdd * reallocate as required. 27978447Sdd */ 28078447Sddstatic void 28178447Sddargappend(char **dstp, const char *fmt, ...) 28278447Sdd{ 28378447Sdd char *old, *new; 28478447Sdd va_list ap; 28578447Sdd 28678447Sdd old = *dstp; 28778447Sdd assert(old != NULL); 28878447Sdd 28978447Sdd va_start(ap, fmt); 29078447Sdd if (vasprintf(&new, fmt,ap) == -1) 29178447Sdd errx(1, "vasprintf"); 29278447Sdd va_end(ap); 29378447Sdd 29478447Sdd *dstp = new; 29578447Sdd if (asprintf(&new, "%s %s", old, new) == -1) 29678447Sdd errx(1, "asprintf"); 29778447Sdd free(*dstp); 29878447Sdd free(old); 29978447Sdd 30078447Sdd *dstp = new; 30178447Sdd} 30278447Sdd 30378447Sdd/* 30478447Sdd * If run-time debugging is enabled, print the expansion of 'fmt'. 30578447Sdd * Otherwise, do nothing. 30678447Sdd */ 30778447Sddstatic void 30878447Sdddebugprintf(const char *fmt, ...) 30978447Sdd{ 31078447Sdd va_list ap; 31178447Sdd 31278447Sdd if (!debug) 31378447Sdd return; 31478447Sdd fprintf(stderr, "DEBUG: "); 31578447Sdd va_start(ap, fmt); 31678447Sdd vfprintf(stderr, fmt, ap); 31778447Sdd va_end(ap); 31878447Sdd fprintf(stderr, "\n"); 31978447Sdd fflush(stderr); 32078447Sdd} 32178447Sdd 32278447Sdd/* 32378447Sdd * Label the memory disk. 32478447Sdd */ 32578447Sddstatic void 32678447Sdddo_disklabel(void) 32778447Sdd{ 32878447Sdd int rv; 32978447Sdd 33078447Sdd rv = run(NULL, "%s -r -w %s%d auto", PATH_DISKLABEL, mdname, unit); 33178447Sdd if (rv) 33278447Sdd errx(1, "disklabel exited with error code %d", rv); 33378447Sdd} 33478447Sdd 33578447Sdd/* 33678447Sdd * Attach a memory disk with a known unit. 33778447Sdd */ 33878447Sddstatic void 33978447Sdddo_mdconfig_attach(const char *args, const enum md_types mdtype) 34078447Sdd{ 34178447Sdd int rv; 34278447Sdd const char *ta; /* Type arg. */ 34378447Sdd 34478447Sdd switch (mdtype) { 34578447Sdd case MD_SWAP: 34678447Sdd ta = "-t swap"; 34778447Sdd break; 34878447Sdd case MD_VNODE: 34978447Sdd ta = "-t vnode"; 35078447Sdd break; 35178447Sdd case MD_MALLOC: 35278447Sdd ta = "-t malloc"; 35378447Sdd break; 35478447Sdd default: 35578447Sdd abort(); 35678447Sdd } 35778447Sdd rv = run(NULL, "%s -a %s%s -u %s%d", PATH_MDCONFIG, ta, args, 35878447Sdd mdname, unit); 35978447Sdd if (rv) 36078447Sdd errx(1, "mdconfig (attach) exited with error code %d", rv); 36178447Sdd} 36278447Sdd 36378447Sdd/* 36478447Sdd * Attach a memory disk with an unknown unit; use autounit. 36578447Sdd */ 36678447Sddstatic void 36778447Sdddo_mdconfig_attach_au(const char *args, const enum md_types mdtype) 36878447Sdd{ 36978447Sdd const char *ta; /* Type arg. */ 37078447Sdd char *linep, *linebuf; /* Line pointer, line buffer. */ 37178447Sdd int fd; /* Standard output of mdconfig invocation. */ 37278447Sdd FILE *sfd; 37378447Sdd int rv; 37478447Sdd char *p; 37578447Sdd size_t linelen; 37678447Sdd 37778447Sdd switch (mdtype) { 37878447Sdd case MD_SWAP: 37978447Sdd ta = "-t swap"; 38078447Sdd break; 38178447Sdd case MD_VNODE: 38278447Sdd ta = "-t vnode"; 38378447Sdd break; 38478447Sdd case MD_MALLOC: 38578447Sdd ta = "-t malloc"; 38678447Sdd break; 38778447Sdd default: 38878447Sdd abort(); 38978447Sdd } 39078447Sdd rv = run(&fd, "%s -a %s%s", PATH_MDCONFIG, ta, args); 39178447Sdd if (rv) 39278447Sdd errx(1, "mdconfig (attach) exited with error code %d", rv); 39378447Sdd 39478447Sdd /* Receive the unit number. */ 39578447Sdd if (norun) { /* Since we didn't run, we can't read. Fake it. */ 39678447Sdd unit = -1; 39778447Sdd return; 39878447Sdd } 39978447Sdd sfd = fdopen(fd, "r"); 40078447Sdd if (sfd == NULL) 40178447Sdd err(1, "fdopen"); 40278447Sdd linep = fgetln(sfd, &linelen); 40378447Sdd if (linep == NULL && linelen < mdnamelen + 1) 40478447Sdd errx(1, "unexpected output from mdconfig (attach)"); 40578447Sdd /* If the output format changes, we want to know about it. */ 40678447Sdd assert(strncmp(linep, mdname, mdnamelen) == 0); 40778447Sdd linebuf = malloc(linelen - mdnamelen + 1); 40878447Sdd assert(linebuf != NULL); 40978447Sdd /* Can't use strlcpy because linep is not NULL-terminated. */ 41078447Sdd strncpy(linebuf, linep + mdnamelen, linelen); 41178447Sdd linebuf[linelen] = '\0'; 41278447Sdd unit = strtoul(linebuf, &p, 10); 41378447Sdd if ((unsigned)unit == ULONG_MAX || *p != '\n') 41478447Sdd errx(1, "unexpected output from mdconfig (attach)"); 41578447Sdd 41678447Sdd fclose(sfd); 41778447Sdd close(fd); 41878447Sdd} 41978447Sdd 42078447Sdd/* 42178447Sdd * Detach a memory disk. 42278447Sdd */ 42378447Sddstatic void 42478447Sdddo_mdconfig_detach(void) 42578447Sdd{ 42678447Sdd int rv; 42778447Sdd 42878447Sdd rv = run(NULL, "%s -d -u %s%d", PATH_MDCONFIG, mdname, unit); 42978447Sdd if (rv && debug) /* This is allowed to fail. */ 43078447Sdd warnx("mdconfig (detach) exited with error code %d (ignored)", 43178447Sdd rv); 43278447Sdd} 43378447Sdd 43478447Sdd/* 43578447Sdd * Mount the configured memory disk. 43678447Sdd */ 43778447Sddstatic void 43878447Sdddo_mount(const char *args, const char *mtpoint) 43978447Sdd{ 44078447Sdd int rv; 44178447Sdd 44278447Sdd rv = run(NULL, "%s%s /dev/%s%dc %s", PATH_MOUNT, args, 44378447Sdd mdname, unit, mtpoint); 44478447Sdd if (rv) 44578447Sdd errx(1, "mount exited with error code %d", rv); 44678447Sdd} 44778447Sdd 44878447Sdd/* 44978447Sdd * Various configuration of the mountpoint. Mostly, enact 'mip'. 45078447Sdd */ 45178447Sddstatic void 45278447Sdddo_mtptsetup(const char *mtpoint, struct mtpt_info *mip) 45378447Sdd{ 45478447Sdd 45578447Sdd if (mip->mi_have_mode) { 45678447Sdd debugprintf("changing mode of %s to %o.", mtpoint, 45778447Sdd mip->mi_mode); 45878447Sdd if (!norun) 45978447Sdd if (chmod(mtpoint, mip->mi_mode) == -1) 46078447Sdd err(1, "chmod: %s", mtpoint); 46178447Sdd } 46278447Sdd /* 46378447Sdd * We have to do these separately because the user may have 46478447Sdd * only specified one of them. 46578447Sdd */ 46678447Sdd if (mip->mi_have_uid) { 46778447Sdd debugprintf("changing owner (user) or %s to %u.", mtpoint, 46878447Sdd mip->mi_uid); 46978447Sdd if (!norun) 47078447Sdd if (chown(mtpoint, mip->mi_uid, -1) == -1) 47178447Sdd err(1, "chown %s to %u (user)", mtpoint, 47278447Sdd mip->mi_uid); 47378447Sdd } 47478447Sdd if (mip->mi_have_gid) { 47578447Sdd debugprintf("changing owner (group) or %s to %u.", mtpoint, 47678447Sdd mip->mi_gid); 47778447Sdd if (!norun) 47878447Sdd if (chown(mtpoint, -1, mip->mi_gid) == -1) 47978447Sdd err(1, "chown %s to %u (group)", mtpoint, 48078447Sdd mip->mi_gid); 48178447Sdd } 48278447Sdd} 48378447Sdd 48478447Sdd/* 48578447Sdd * Put a filesystem on the memory disk. 48678447Sdd */ 48778447Sddstatic void 48878447Sdddo_newfs(const char *args) 48978447Sdd{ 49078447Sdd int rv; 49178447Sdd 49278447Sdd rv = run(NULL, "%s%s /dev/%s%dc", PATH_NEWFS, args, mdname, unit); 49378447Sdd if (rv) 49478447Sdd errx(1, "newfs exited with error code %d", rv); 49578447Sdd} 49678447Sdd 49778447Sdd/* 49878447Sdd * 'str' should be a user and group name similar to the last argument 49978447Sdd * to chown(1); i.e., a user, followed by a colon, followed by a 50078447Sdd * group. The user and group in 'str' may be either a [ug]id or a 50178447Sdd * name. Upon return, the uid and gid fields in 'mip' will contain 50278447Sdd * the uid and gid of the user and group name in 'str', respectively. 50378447Sdd * 50478447Sdd * In other words, this derives a user and group id from a string 50578447Sdd * formatted like the last argument to chown(1). 50678447Sdd */ 50778447Sddstatic void 50878447Sddextract_ugid(const char *str, struct mtpt_info *mip) 50978447Sdd{ 51078447Sdd char *ug; /* Writable 'str'. */ 51178447Sdd char *user, *group; /* Result of extracton. */ 51278447Sdd struct passwd *pw; 51378447Sdd struct group *gr; 51478447Sdd char *p; 51578447Sdd uid_t *uid; 51678447Sdd gid_t *gid; 51778447Sdd 51878447Sdd uid = &mip->mi_uid; 51978447Sdd gid = &mip->mi_gid; 52078447Sdd mip->mi_have_uid = mip->mi_have_gid = false; 52178447Sdd 52278447Sdd /* Extract the user and group from 'str'. Format above. */ 52378711Sdd ug = strdup(str); 52478447Sdd assert(ug != NULL); 52578447Sdd group = ug; 52678447Sdd user = strsep(&group, ":"); 52778447Sdd if (user == NULL || group == NULL || *user == '\0' || *group == '\0') 52878447Sdd usage(); 52978447Sdd 53078447Sdd /* Derive uid. */ 53178447Sdd *uid = strtoul(user, &p, 10); 53278447Sdd if ((unsigned)*uid == ULONG_MAX) 53378447Sdd usage(); 53478447Sdd if (*p != '\0') { 53578447Sdd pw = getpwnam(user); 53678447Sdd if (pw == NULL) 53778447Sdd errx(1, "invalid user: %s", user); 53878447Sdd *uid = pw->pw_uid; 53978447Sdd mip->mi_have_uid = true; 54078447Sdd } 54178447Sdd 54278447Sdd /* Derive gid. */ 54378447Sdd *gid = strtoul(group, &p, 10); 54478447Sdd if ((unsigned)*gid == ULONG_MAX) 54578447Sdd usage(); 54678447Sdd if (*p != '\0') { 54778447Sdd gr = getgrnam(group); 54878447Sdd if (gr == NULL) 54978447Sdd errx(1, "invalid group: %s", group); 55078447Sdd *gid = gr->gr_gid; 55178447Sdd mip->mi_have_gid = true; 55278447Sdd } 55378447Sdd 55478447Sdd free(ug); 55578447Sdd /* 55678447Sdd * At this point we don't support only a username or only a 55778447Sdd * group name. do_mtptsetup already does, so when this 55878447Sdd * feature is desired, this is the only routine that needs to 55978447Sdd * be changed. 56078447Sdd */ 56178447Sdd assert(mip->mi_have_uid); 56278447Sdd assert(mip->mi_have_gid); 56378447Sdd} 56478447Sdd 56578447Sdd/* 56678447Sdd * Run a process with command name and arguments pointed to by the 56778447Sdd * formatted string 'cmdline'. Since system(3) is not used, the first 56878447Sdd * space-delimited token of 'cmdline' must be the full pathname of the 56978447Sdd * program to run. The return value is the return code of the process 57078447Sdd * spawned. If 'ofd' is non-NULL, it is set to the standard output of 57178447Sdd * the program spawned (i.e., you can read from ofd and get the output 57278447Sdd * of the program). 57378447Sdd */ 57478447Sddstatic int 57578447Sddrun(int *ofd, const char *cmdline, ...) 57678447Sdd{ 57781628Sobrien char **argv, **argvp; /* Result of splitting 'cmd'. */ 57881628Sobrien int argc; 57978447Sdd char *cmd; /* Expansion of 'cmdline'. */ 58078447Sdd int pid, status; /* Child info. */ 58178447Sdd int pfd[2]; /* Pipe to the child. */ 58278447Sdd int nfd; /* Null (/dev/null) file descriptor. */ 58378447Sdd bool dup2dn; /* Dup /dev/null to stdout? */ 58478447Sdd va_list ap; 58578447Sdd char *p; 58678447Sdd int rv, i; 58778447Sdd 58878447Sdd dup2dn = true; 58978447Sdd va_start(ap, cmdline); 59078447Sdd rv = vasprintf(&cmd, cmdline, ap); 59178447Sdd if (rv == -1) 59278447Sdd err(1, "vasprintf"); 59378447Sdd va_end(ap); 59478447Sdd 59581628Sobrien /* Split up 'cmd' into 'argv' for use with execve. */ 59681628Sobrien for (argc = 1, p = cmd; (p = strchr(p, ' ')) != NULL; p++) 59781628Sobrien argc++; /* 'argc' generation loop. */ 59881628Sobrien argv = (char **)malloc(sizeof(*argv) * (argc + 1)); 59981628Sobrien assert(argv != NULL); 60081628Sobrien for (p = cmd, argvp = argv; (*argvp = strsep(&p, " ")) != NULL;) 60181628Sobrien if (**argv != '\0') 60281628Sobrien if (++argvp >= &argv[argc]) { 60381628Sobrien *argvp = NULL; 60478447Sdd break; 60578447Sdd } 60681628Sobrien assert(*argv); 60778447Sdd 60878447Sdd /* Make sure the above loop works as expected. */ 60978447Sdd if (debug) { 61078447Sdd /* 61178447Sdd * We can't, but should, use debugprintf here. First, 61278447Sdd * it appends a trailing newline to the output, and 61378447Sdd * second it prepends "DEBUG: " to the output. The 61478447Sdd * former is a problem for this would-be first call, 61578447Sdd * and the latter for the would-be call inside the 61678447Sdd * loop. 61778447Sdd */ 61878447Sdd (void)fprintf(stderr, "DEBUG: running:"); 61978447Sdd /* Should be equivilent to 'cmd' (before strsep, of course). */ 62081628Sobrien for (i = 0; argv[i] != NULL; i++) 62181628Sobrien (void)fprintf(stderr, " %s", argv[i]); 62278447Sdd (void)fprintf(stderr, "\n"); 62378447Sdd } 62478447Sdd 62578447Sdd /* Create a pipe if necessary and fork the helper program. */ 62678447Sdd if (ofd != NULL) { 62778447Sdd if (pipe(&pfd[0]) == -1) 62878447Sdd err(1, "pipe"); 62978447Sdd *ofd = pfd[0]; 63078447Sdd dup2dn = false; 63178447Sdd } 63278447Sdd pid = fork(); 63378447Sdd switch (pid) { 63478447Sdd case 0: 63578447Sdd /* XXX can we call err() in here? */ 63678447Sdd if (norun) 63778447Sdd _exit(0); 63878447Sdd if (ofd != NULL) 63978447Sdd if (dup2(pfd[1], STDOUT_FILENO) < 0) 64078447Sdd err(1, "dup2"); 64178447Sdd if (!loudsubs) { 64278447Sdd nfd = open(_PATH_DEVNULL, O_RDWR); 64378447Sdd if (nfd == -1) 64478447Sdd err(1, "open: %s", _PATH_DEVNULL); 64578447Sdd if (dup2(nfd, STDIN_FILENO) < 0) 64678447Sdd err(1, "dup2"); 64778447Sdd if (dup2dn) 64878447Sdd if (dup2(nfd, STDOUT_FILENO) < 0) 64978447Sdd err(1, "dup2"); 65078447Sdd if (dup2(nfd, STDERR_FILENO) < 0) 65178447Sdd err(1, "dup2"); 65278447Sdd } 65378447Sdd 65481628Sobrien (void)execv(argv[0], argv); 65581628Sobrien warn("exec: %s", argv[0]); 65678447Sdd _exit(-1); 65778447Sdd case -1: 65878447Sdd err(1, "fork"); 65978447Sdd } 66078447Sdd 66178447Sdd free(cmd); 66281628Sobrien free(argv); 66378447Sdd while (waitpid(pid, &status, 0) != pid) 66478447Sdd ; 66578447Sdd return (WEXITSTATUS(status)); 66678447Sdd} 66778447Sdd 66878447Sddstatic void 66978447Sddusage(void) 67078447Sdd{ 67181742Sdd const char *name; 67278447Sdd 67381742Sdd if (compat) 67481742Sdd name = getprogname(); 67581742Sdd else 67681742Sdd name = "mdmfs"; 67781742Sdd if (!compat) 67881742Sdd fprintf(stderr, 67995258Sdes"usage: %s [-DLMNSUX] [-a maxcontig [-b block-size] [-c cylinders]\n" 68081742Sdd"\t[-d rotdelay] [-e maxbpg] [-F file] [-f frag-size] [-i bytes]\n" 68181742Sdd"\t[-m percent-free] [-n rotational-positions] [-O optimization]\n" 68281742Sdd"\t[-o mount-options] [-p permissions] [-s size] [-w user:group]\n" 68381742Sdd"\tmd-device mount-point\n", name); 68478447Sdd fprintf(stderr, 68595258Sdes"usage: %s -C [-NU] [-a maxcontig] [-b block-size] [-c cylinders]\n" 68678447Sdd"\t[-d rotdelay] [-e maxbpg] [-F file] [-f frag-size] [-i bytes]\n" 68778447Sdd"\t[-m percent-free] [-n rotational-positions] [-O optimization]\n" 68881742Sdd"\t[-o mount-options] [-s size] md-device mount-point\n", name); 68978447Sdd exit(1); 69078447Sdd} 691