mdmfs.c revision 163952
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 163952 2006-11-03 12:02:24Z ru $"); 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 5378447Sddtypedef enum { false, true } bool; 5478447Sdd 5578447Sddstruct mtpt_info { 5678447Sdd uid_t mi_uid; 5778447Sdd bool mi_have_uid; 5878447Sdd gid_t mi_gid; 5978447Sdd bool mi_have_gid; 6078447Sdd mode_t mi_mode; 6178447Sdd bool mi_have_mode; 6278447Sdd}; 6378447Sdd 6478447Sddstatic bool debug; /* Emit debugging information? */ 6578447Sddstatic bool loudsubs; /* Suppress output from helper programs? */ 6678447Sddstatic bool norun; /* Actually run the helper programs? */ 6778447Sddstatic int unit; /* The unit we're working with. */ 6878447Sddstatic const char *mdname; /* Name of memory disk device (e.g., "md"). */ 6978447Sddstatic size_t mdnamelen; /* Length of mdname. */ 70155769Ssobomaxstatic const char *path_mdconfig =_PATH_MDCONFIG; 7178447Sdd 7279052Skrisstatic void argappend(char **, const char *, ...) __printflike(2, 3); 7379052Skrisstatic void debugprintf(const char *, ...) __printflike(1, 2); 7478447Sddstatic void do_mdconfig_attach(const char *, const enum md_types); 7578447Sddstatic void do_mdconfig_attach_au(const char *, const enum md_types); 7678447Sddstatic void do_mdconfig_detach(void); 7778447Sddstatic void do_mount(const char *, const char *); 7878447Sddstatic void do_mtptsetup(const char *, struct mtpt_info *); 7978447Sddstatic void do_newfs(const char *); 8078447Sddstatic void extract_ugid(const char *, struct mtpt_info *); 8179052Skrisstatic int run(int *, const char *, ...) __printflike(2, 3); 8278447Sddstatic void usage(void); 8378447Sdd 8478447Sddint 8581628Sobrienmain(int argc, char **argv) 8678447Sdd{ 8778447Sdd struct mtpt_info mi; /* Mountpoint info. */ 8878447Sdd char *mdconfig_arg, *newfs_arg, /* Args to helper programs. */ 8978447Sdd *mount_arg; 9078447Sdd enum md_types mdtype; /* The type of our memory disk. */ 9178447Sdd bool have_mdtype; 92153961Sdd bool detach, softdep, autounit, newfs; 9378447Sdd char *mtpoint, *unitstr; 94124830Sgrehan char *p; 95124830Sgrehan int ch; 96118500Syar void *set; 97141082Sssouhlal unsigned long ul; 9878447Sdd 9978447Sdd /* Misc. initialization. */ 10078447Sdd (void)memset(&mi, '\0', sizeof(mi)); 10178447Sdd detach = true; 10278447Sdd softdep = true; 10378447Sdd autounit = false; 104153961Sdd newfs = true; 10578447Sdd have_mdtype = false; 106140815Sssouhlal mdtype = MD_SWAP; 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 || 121163952Sru strcmp(getprogname(), "mfs") == 0) { 122163952Sru /* Make compatibility assumptions. */ 123163952Sru mi.mi_mode = 01777; 124163952Sru mi.mi_have_mode = true; 125163952Sru } 12681742Sdd 12781628Sobrien while ((ch = getopt(argc, argv, 128155769Ssobomax "a:b:Cc:Dd:E:e:F:f:hi:LlMm:Nn:O:o:Pp:Ss:t:Uv:w:X")) != -1) 12978447Sdd switch (ch) { 13078447Sdd case 'a': 13178447Sdd argappend(&newfs_arg, "-a %s", optarg); 13278447Sdd break; 13378447Sdd case 'b': 13478447Sdd argappend(&newfs_arg, "-b %s", optarg); 13578447Sdd break; 13681742Sdd case 'C': 137163952Sru /* Ignored for compatibility. */ 13881742Sdd break; 13978447Sdd case 'c': 14078447Sdd argappend(&newfs_arg, "-c %s", optarg); 14178447Sdd break; 14278447Sdd case 'D': 14378447Sdd detach = false; 14478447Sdd break; 14578447Sdd case 'd': 14678447Sdd argappend(&newfs_arg, "-d %s", optarg); 14778447Sdd break; 148155769Ssobomax case 'E': 149155769Ssobomax path_mdconfig = optarg; 150155769Ssobomax break; 15178447Sdd case 'e': 15278447Sdd argappend(&newfs_arg, "-e %s", optarg); 15378447Sdd break; 15478447Sdd case 'F': 15578447Sdd if (have_mdtype) 15678447Sdd usage(); 15778447Sdd mdtype = MD_VNODE; 15878447Sdd have_mdtype = true; 15978447Sdd argappend(&mdconfig_arg, "-f %s", optarg); 16078447Sdd break; 16178447Sdd case 'f': 16278447Sdd argappend(&newfs_arg, "-f %s", optarg); 16378447Sdd break; 16478447Sdd case 'h': 16578447Sdd usage(); 16678447Sdd break; 16778447Sdd case 'i': 16878447Sdd argappend(&newfs_arg, "-i %s", optarg); 16978447Sdd break; 17078447Sdd case 'L': 17178447Sdd loudsubs = true; 17278447Sdd break; 173126255Srwatson case 'l': 174126255Srwatson argappend(&newfs_arg, "-l"); 175126255Srwatson break; 17678447Sdd case 'M': 17778447Sdd if (have_mdtype) 17878447Sdd usage(); 17978447Sdd mdtype = MD_MALLOC; 18078447Sdd have_mdtype = true; 18178447Sdd break; 18278447Sdd case 'm': 18378447Sdd argappend(&newfs_arg, "-m %s", optarg); 18478447Sdd break; 18578447Sdd case 'N': 18678447Sdd norun = true; 18778447Sdd break; 18878447Sdd case 'n': 18978447Sdd argappend(&newfs_arg, "-n %s", optarg); 19078447Sdd break; 19178447Sdd case 'O': 19278447Sdd argappend(&newfs_arg, "-o %s", optarg); 19378447Sdd break; 19478447Sdd case 'o': 19578447Sdd argappend(&mount_arg, "-o %s", optarg); 19678447Sdd break; 197153961Sdd case 'P': 198153961Sdd newfs = false; 199153961Sdd break; 20078447Sdd case 'p': 201118500Syar if ((set = setmode(optarg)) == NULL) 20278447Sdd usage(); 203118500Syar mi.mi_mode = getmode(set, S_IRWXU | S_IRWXG | S_IRWXO); 20478447Sdd mi.mi_have_mode = true; 205118500Syar free(set); 20678447Sdd break; 20778447Sdd case 'S': 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; 216107475Srwatson case 'v': 217107475Srwatson argappend(&newfs_arg, "-O %s", optarg); 218107475Srwatson break; 21978447Sdd case 'w': 22078447Sdd extract_ugid(optarg, &mi); 22178447Sdd break; 22278447Sdd case 'X': 22378447Sdd debug = true; 22478447Sdd break; 22578447Sdd default: 22678447Sdd usage(); 22778447Sdd } 22881628Sobrien argc -= optind; 22981628Sobrien argv += optind; 23081628Sobrien if (argc < 2) 23178447Sdd usage(); 23278447Sdd 23378447Sdd /* Derive 'unit' (global). */ 23481628Sobrien unitstr = argv[0]; 23578447Sdd if (strncmp(unitstr, "/dev/", 5) == 0) 23678447Sdd unitstr += 5; 23778447Sdd if (strncmp(unitstr, mdname, mdnamelen) == 0) 23878447Sdd unitstr += mdnamelen; 23978447Sdd if (*unitstr == '\0') { 24078447Sdd autounit = true; 24178447Sdd unit = -1; 24278447Sdd } else { 243141082Sssouhlal ul = strtoul(unitstr, &p, 10); 244141082Sssouhlal if (ul == ULONG_MAX || *p != '\0') 24578447Sdd errx(1, "bad device unit: %s", unitstr); 246141082Sssouhlal unit = ul; 24778447Sdd } 24878447Sdd 24981628Sobrien mtpoint = argv[1]; 25078447Sdd if (!have_mdtype) 25178447Sdd mdtype = MD_SWAP; 25278447Sdd if (softdep) 25378447Sdd argappend(&newfs_arg, "-U"); 254153961Sdd if (mdtype != MD_VNODE && !newfs) 255153961Sdd errx(1, "-P requires a vnode-backed disk"); 25678447Sdd 25778447Sdd /* Do the work. */ 25878447Sdd if (detach && !autounit) 25978447Sdd do_mdconfig_detach(); 26078447Sdd if (autounit) 26178447Sdd do_mdconfig_attach_au(mdconfig_arg, mdtype); 26278447Sdd else 26378447Sdd do_mdconfig_attach(mdconfig_arg, mdtype); 264153961Sdd if (newfs) 265153961Sdd do_newfs(newfs_arg); 26678447Sdd do_mount(mount_arg, mtpoint); 26778447Sdd do_mtptsetup(mtpoint, &mi); 26878447Sdd 26978447Sdd return (0); 27078447Sdd} 27178447Sdd 27278447Sdd/* 27378447Sdd * Append the expansion of 'fmt' to the buffer pointed to by '*dstp'; 27478447Sdd * reallocate as required. 27578447Sdd */ 27678447Sddstatic void 27778447Sddargappend(char **dstp, const char *fmt, ...) 27878447Sdd{ 27978447Sdd char *old, *new; 28078447Sdd va_list ap; 28178447Sdd 28278447Sdd old = *dstp; 28378447Sdd assert(old != NULL); 28478447Sdd 28578447Sdd va_start(ap, fmt); 28678447Sdd if (vasprintf(&new, fmt,ap) == -1) 28778447Sdd errx(1, "vasprintf"); 28878447Sdd va_end(ap); 28978447Sdd 29078447Sdd *dstp = new; 29178447Sdd if (asprintf(&new, "%s %s", old, new) == -1) 29278447Sdd errx(1, "asprintf"); 29378447Sdd free(*dstp); 29478447Sdd free(old); 29578447Sdd 29678447Sdd *dstp = new; 29778447Sdd} 29878447Sdd 29978447Sdd/* 30078447Sdd * If run-time debugging is enabled, print the expansion of 'fmt'. 30178447Sdd * Otherwise, do nothing. 30278447Sdd */ 30378447Sddstatic void 30478447Sdddebugprintf(const char *fmt, ...) 30578447Sdd{ 30678447Sdd va_list ap; 30778447Sdd 30878447Sdd if (!debug) 30978447Sdd return; 31078447Sdd fprintf(stderr, "DEBUG: "); 31178447Sdd va_start(ap, fmt); 31278447Sdd vfprintf(stderr, fmt, ap); 31378447Sdd va_end(ap); 31478447Sdd fprintf(stderr, "\n"); 31578447Sdd fflush(stderr); 31678447Sdd} 31778447Sdd 31878447Sdd/* 31978447Sdd * Attach a memory disk with a known unit. 32078447Sdd */ 32178447Sddstatic void 32278447Sdddo_mdconfig_attach(const char *args, const enum md_types mdtype) 32378447Sdd{ 32478447Sdd int rv; 32578447Sdd const char *ta; /* Type arg. */ 32678447Sdd 32778447Sdd switch (mdtype) { 32878447Sdd case MD_SWAP: 32978447Sdd ta = "-t swap"; 33078447Sdd break; 33178447Sdd case MD_VNODE: 33278447Sdd ta = "-t vnode"; 33378447Sdd break; 33478447Sdd case MD_MALLOC: 33578447Sdd ta = "-t malloc"; 33678447Sdd break; 33778447Sdd default: 33878447Sdd abort(); 33978447Sdd } 340155769Ssobomax rv = run(NULL, "%s -a %s%s -u %s%d", path_mdconfig, ta, args, 34178447Sdd mdname, unit); 34278447Sdd if (rv) 34378447Sdd errx(1, "mdconfig (attach) exited with error code %d", rv); 34478447Sdd} 34578447Sdd 34678447Sdd/* 34778447Sdd * Attach a memory disk with an unknown unit; use autounit. 34878447Sdd */ 34978447Sddstatic void 35078447Sdddo_mdconfig_attach_au(const char *args, const enum md_types mdtype) 35178447Sdd{ 35278447Sdd const char *ta; /* Type arg. */ 35378447Sdd char *linep, *linebuf; /* Line pointer, line buffer. */ 35478447Sdd int fd; /* Standard output of mdconfig invocation. */ 35578447Sdd FILE *sfd; 35678447Sdd int rv; 35778447Sdd char *p; 35878447Sdd size_t linelen; 359141082Sssouhlal unsigned long ul; 36078447Sdd 36178447Sdd switch (mdtype) { 36278447Sdd case MD_SWAP: 36378447Sdd ta = "-t swap"; 36478447Sdd break; 36578447Sdd case MD_VNODE: 36678447Sdd ta = "-t vnode"; 36778447Sdd break; 36878447Sdd case MD_MALLOC: 36978447Sdd ta = "-t malloc"; 37078447Sdd break; 37178447Sdd default: 37278447Sdd abort(); 37378447Sdd } 374155769Ssobomax rv = run(&fd, "%s -a %s%s", path_mdconfig, ta, args); 37578447Sdd if (rv) 37678447Sdd errx(1, "mdconfig (attach) exited with error code %d", rv); 37778447Sdd 37878447Sdd /* Receive the unit number. */ 37978447Sdd if (norun) { /* Since we didn't run, we can't read. Fake it. */ 380153637Sdd unit = 0; 38178447Sdd return; 38278447Sdd } 38378447Sdd sfd = fdopen(fd, "r"); 38478447Sdd if (sfd == NULL) 38578447Sdd err(1, "fdopen"); 38678447Sdd linep = fgetln(sfd, &linelen); 38778447Sdd if (linep == NULL && linelen < mdnamelen + 1) 38878447Sdd errx(1, "unexpected output from mdconfig (attach)"); 38978447Sdd /* If the output format changes, we want to know about it. */ 39078447Sdd assert(strncmp(linep, mdname, mdnamelen) == 0); 39178447Sdd linebuf = malloc(linelen - mdnamelen + 1); 39278447Sdd assert(linebuf != NULL); 39378447Sdd /* Can't use strlcpy because linep is not NULL-terminated. */ 39478447Sdd strncpy(linebuf, linep + mdnamelen, linelen); 39578447Sdd linebuf[linelen] = '\0'; 396141082Sssouhlal ul = strtoul(linebuf, &p, 10); 397141082Sssouhlal if (ul == ULONG_MAX || *p != '\n') 39878447Sdd errx(1, "unexpected output from mdconfig (attach)"); 399141082Sssouhlal unit = ul; 40078447Sdd 40178447Sdd fclose(sfd); 40278447Sdd close(fd); 40378447Sdd} 40478447Sdd 40578447Sdd/* 40678447Sdd * Detach a memory disk. 40778447Sdd */ 40878447Sddstatic void 40978447Sdddo_mdconfig_detach(void) 41078447Sdd{ 41178447Sdd int rv; 41278447Sdd 413155769Ssobomax rv = run(NULL, "%s -d -u %s%d", path_mdconfig, mdname, unit); 41478447Sdd if (rv && debug) /* This is allowed to fail. */ 41578447Sdd warnx("mdconfig (detach) exited with error code %d (ignored)", 41678447Sdd rv); 41778447Sdd} 41878447Sdd 41978447Sdd/* 42078447Sdd * Mount the configured memory disk. 42178447Sdd */ 42278447Sddstatic void 42378447Sdddo_mount(const char *args, const char *mtpoint) 42478447Sdd{ 42578447Sdd int rv; 42678447Sdd 427117033Sgordon rv = run(NULL, "%s%s /dev/%s%d %s", _PATH_MOUNT, args, 42878447Sdd mdname, unit, mtpoint); 42978447Sdd if (rv) 43078447Sdd errx(1, "mount exited with error code %d", rv); 43178447Sdd} 43278447Sdd 43378447Sdd/* 43478447Sdd * Various configuration of the mountpoint. Mostly, enact 'mip'. 43578447Sdd */ 43678447Sddstatic void 43778447Sdddo_mtptsetup(const char *mtpoint, struct mtpt_info *mip) 43878447Sdd{ 43978447Sdd 44078447Sdd if (mip->mi_have_mode) { 44178447Sdd debugprintf("changing mode of %s to %o.", mtpoint, 44278447Sdd mip->mi_mode); 44378447Sdd if (!norun) 44478447Sdd if (chmod(mtpoint, mip->mi_mode) == -1) 44578447Sdd err(1, "chmod: %s", mtpoint); 44678447Sdd } 44778447Sdd /* 44878447Sdd * We have to do these separately because the user may have 44978447Sdd * only specified one of them. 45078447Sdd */ 45178447Sdd if (mip->mi_have_uid) { 45278447Sdd debugprintf("changing owner (user) or %s to %u.", mtpoint, 45378447Sdd mip->mi_uid); 45478447Sdd if (!norun) 45578447Sdd if (chown(mtpoint, mip->mi_uid, -1) == -1) 45678447Sdd err(1, "chown %s to %u (user)", mtpoint, 45778447Sdd mip->mi_uid); 45878447Sdd } 45978447Sdd if (mip->mi_have_gid) { 46078447Sdd debugprintf("changing owner (group) or %s to %u.", mtpoint, 46178447Sdd mip->mi_gid); 46278447Sdd if (!norun) 46378447Sdd if (chown(mtpoint, -1, mip->mi_gid) == -1) 46478447Sdd err(1, "chown %s to %u (group)", mtpoint, 46578447Sdd mip->mi_gid); 46678447Sdd } 46778447Sdd} 46878447Sdd 46978447Sdd/* 470102231Strhodes * Put a file system on the memory disk. 47178447Sdd */ 47278447Sddstatic void 47378447Sdddo_newfs(const char *args) 47478447Sdd{ 47578447Sdd int rv; 47678447Sdd 477117033Sgordon rv = run(NULL, "%s%s /dev/%s%d", _PATH_NEWFS, args, mdname, unit); 47878447Sdd if (rv) 47978447Sdd errx(1, "newfs exited with error code %d", rv); 48078447Sdd} 48178447Sdd 48278447Sdd/* 48378447Sdd * 'str' should be a user and group name similar to the last argument 48478447Sdd * to chown(1); i.e., a user, followed by a colon, followed by a 48578447Sdd * group. The user and group in 'str' may be either a [ug]id or a 48678447Sdd * name. Upon return, the uid and gid fields in 'mip' will contain 48778447Sdd * the uid and gid of the user and group name in 'str', respectively. 48878447Sdd * 48978447Sdd * In other words, this derives a user and group id from a string 49078447Sdd * formatted like the last argument to chown(1). 491151315Srse * 492151315Srse * Notice: At this point we don't support only a username or only a 493151315Srse * group name. do_mtptsetup already does, so when this feature is 494151315Srse * desired, this is the only routine that needs to be changed. 49578447Sdd */ 49678447Sddstatic void 49778447Sddextract_ugid(const char *str, struct mtpt_info *mip) 49878447Sdd{ 49978447Sdd char *ug; /* Writable 'str'. */ 50078447Sdd char *user, *group; /* Result of extracton. */ 50178447Sdd struct passwd *pw; 50278447Sdd struct group *gr; 50378447Sdd char *p; 50478447Sdd uid_t *uid; 50578447Sdd gid_t *gid; 50678447Sdd 50778447Sdd uid = &mip->mi_uid; 50878447Sdd gid = &mip->mi_gid; 50978447Sdd mip->mi_have_uid = mip->mi_have_gid = false; 51078447Sdd 51178447Sdd /* Extract the user and group from 'str'. Format above. */ 51278711Sdd ug = strdup(str); 51378447Sdd assert(ug != NULL); 51478447Sdd group = ug; 51578447Sdd user = strsep(&group, ":"); 51678447Sdd if (user == NULL || group == NULL || *user == '\0' || *group == '\0') 51778447Sdd usage(); 51878447Sdd 51978447Sdd /* Derive uid. */ 52078447Sdd *uid = strtoul(user, &p, 10); 521117430Skan if (*uid == (uid_t)ULONG_MAX) 52278447Sdd usage(); 52378447Sdd if (*p != '\0') { 52478447Sdd pw = getpwnam(user); 52578447Sdd if (pw == NULL) 52678447Sdd errx(1, "invalid user: %s", user); 52778447Sdd *uid = pw->pw_uid; 52878447Sdd } 529151315Srse mip->mi_have_uid = true; 53078447Sdd 53178447Sdd /* Derive gid. */ 53278447Sdd *gid = strtoul(group, &p, 10); 533117430Skan if (*gid == (gid_t)ULONG_MAX) 53478447Sdd usage(); 53578447Sdd if (*p != '\0') { 53678447Sdd gr = getgrnam(group); 53778447Sdd if (gr == NULL) 53878447Sdd errx(1, "invalid group: %s", group); 53978447Sdd *gid = gr->gr_gid; 54078447Sdd } 541151315Srse mip->mi_have_gid = true; 54278447Sdd 54378447Sdd free(ug); 54478447Sdd} 54578447Sdd 54678447Sdd/* 54778447Sdd * Run a process with command name and arguments pointed to by the 54878447Sdd * formatted string 'cmdline'. Since system(3) is not used, the first 54978447Sdd * space-delimited token of 'cmdline' must be the full pathname of the 55078447Sdd * program to run. The return value is the return code of the process 55178447Sdd * spawned. If 'ofd' is non-NULL, it is set to the standard output of 55278447Sdd * the program spawned (i.e., you can read from ofd and get the output 55378447Sdd * of the program). 55478447Sdd */ 55578447Sddstatic int 55678447Sddrun(int *ofd, const char *cmdline, ...) 55778447Sdd{ 55881628Sobrien char **argv, **argvp; /* Result of splitting 'cmd'. */ 55981628Sobrien int argc; 56078447Sdd char *cmd; /* Expansion of 'cmdline'. */ 56178447Sdd int pid, status; /* Child info. */ 56278447Sdd int pfd[2]; /* Pipe to the child. */ 56378447Sdd int nfd; /* Null (/dev/null) file descriptor. */ 56478447Sdd bool dup2dn; /* Dup /dev/null to stdout? */ 56578447Sdd va_list ap; 56678447Sdd char *p; 56778447Sdd int rv, i; 56878447Sdd 56978447Sdd dup2dn = true; 57078447Sdd va_start(ap, cmdline); 57178447Sdd rv = vasprintf(&cmd, cmdline, ap); 57278447Sdd if (rv == -1) 57378447Sdd err(1, "vasprintf"); 57478447Sdd va_end(ap); 57578447Sdd 57681628Sobrien /* Split up 'cmd' into 'argv' for use with execve. */ 57781628Sobrien for (argc = 1, p = cmd; (p = strchr(p, ' ')) != NULL; p++) 57881628Sobrien argc++; /* 'argc' generation loop. */ 57981628Sobrien argv = (char **)malloc(sizeof(*argv) * (argc + 1)); 58081628Sobrien assert(argv != NULL); 58181628Sobrien for (p = cmd, argvp = argv; (*argvp = strsep(&p, " ")) != NULL;) 58281628Sobrien if (**argv != '\0') 58381628Sobrien if (++argvp >= &argv[argc]) { 58481628Sobrien *argvp = NULL; 58578447Sdd break; 58678447Sdd } 58781628Sobrien assert(*argv); 58878447Sdd 58978447Sdd /* Make sure the above loop works as expected. */ 59078447Sdd if (debug) { 59178447Sdd /* 59278447Sdd * We can't, but should, use debugprintf here. First, 59378447Sdd * it appends a trailing newline to the output, and 59478447Sdd * second it prepends "DEBUG: " to the output. The 59578447Sdd * former is a problem for this would-be first call, 59678447Sdd * and the latter for the would-be call inside the 59778447Sdd * loop. 59878447Sdd */ 59978447Sdd (void)fprintf(stderr, "DEBUG: running:"); 60078447Sdd /* Should be equivilent to 'cmd' (before strsep, of course). */ 60181628Sobrien for (i = 0; argv[i] != NULL; i++) 60281628Sobrien (void)fprintf(stderr, " %s", argv[i]); 60378447Sdd (void)fprintf(stderr, "\n"); 60478447Sdd } 60578447Sdd 60678447Sdd /* Create a pipe if necessary and fork the helper program. */ 60778447Sdd if (ofd != NULL) { 60878447Sdd if (pipe(&pfd[0]) == -1) 60978447Sdd err(1, "pipe"); 61078447Sdd *ofd = pfd[0]; 61178447Sdd dup2dn = false; 61278447Sdd } 61378447Sdd pid = fork(); 61478447Sdd switch (pid) { 61578447Sdd case 0: 61678447Sdd /* XXX can we call err() in here? */ 61778447Sdd if (norun) 61878447Sdd _exit(0); 61978447Sdd if (ofd != NULL) 62078447Sdd if (dup2(pfd[1], STDOUT_FILENO) < 0) 62178447Sdd err(1, "dup2"); 62278447Sdd if (!loudsubs) { 62378447Sdd nfd = open(_PATH_DEVNULL, O_RDWR); 62478447Sdd if (nfd == -1) 62578447Sdd err(1, "open: %s", _PATH_DEVNULL); 62678447Sdd if (dup2(nfd, STDIN_FILENO) < 0) 62778447Sdd err(1, "dup2"); 62878447Sdd if (dup2dn) 62978447Sdd if (dup2(nfd, STDOUT_FILENO) < 0) 63078447Sdd err(1, "dup2"); 63178447Sdd if (dup2(nfd, STDERR_FILENO) < 0) 63278447Sdd err(1, "dup2"); 63378447Sdd } 63478447Sdd 63581628Sobrien (void)execv(argv[0], argv); 63681628Sobrien warn("exec: %s", argv[0]); 63778447Sdd _exit(-1); 63878447Sdd case -1: 63978447Sdd err(1, "fork"); 64078447Sdd } 64178447Sdd 64278447Sdd free(cmd); 64381628Sobrien free(argv); 64478447Sdd while (waitpid(pid, &status, 0) != pid) 64578447Sdd ; 64678447Sdd return (WEXITSTATUS(status)); 64778447Sdd} 64878447Sdd 64978447Sddstatic void 65078447Sddusage(void) 65178447Sdd{ 65278447Sdd 653163952Sru fprintf(stderr, 654153961Sdd"usage: %s [-DLlMNPSUX] [-a maxcontig] [-b block-size] [-c cylinders]\n" 655155769Ssobomax"\t[-d rotdelay] [-E path-mdconfig] [-e maxbpg] [-F file] [-f frag-size]\n" 656155769Ssobomax"\t[-i bytes] [-m percent-free] [-n rotational-positions] [-O optimization]\n" 657141611Sru"\t[-o mount-options] [-p permissions] [-s size] [-v version]\n" 658163952Sru"\t[-w user:group] md-device mount-point\n", getprogname()); 65978447Sdd exit(1); 66078447Sdd} 661