usr/src/usr.bin/xinstall/xinstall.c

/*
 * Copyright (c) 1987, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1987, 1993\n\
        The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)xinstall.c  8.1 (Berkeley) %G%";
#endif /* not lint */

#include <sys/param.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <sys/stat.h>

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "pathnames.h"

struct passwd *pp;
struct group *gp;
int docopy, dostrip;
int mode = S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
char *group, *owner, pathbuf[MAXPATHLEN];

#define DIRECTORY       0x01            /* Tell install it's a directory. */
#define SETFLAGS        0x02            /* Tell install to set flags. */

void    copy __P((int, char *, int, char *, off_t));
void    err __P((const char *, ...));
void    install __P((char *, char *, u_long, u_int));
u_long  string_to_flags __P((char **, u_long *, u_long *));
void    strip __P((char *));
void    usage __P((void));

int
main(argc, argv)
        int argc;
        char *argv[];
{
        struct stat from_sb, to_sb;
        mode_t *set;
        u_long fset;
        u_int iflags;
        int ch, no_target;
        char *flags, *to_name;

        iflags = 0;
        while ((ch = getopt(argc, argv, "cf:g:m:o:s")) != EOF)
                switch((char)ch) {
                case 'c':
                        docopy = 1;
                        break;
                case 'f':
                        flags = optarg;
                        if (string_to_flags(&flags, &fset, NULL))
                                err("%s: invalid flag", flags);
                        iflags |= SETFLAGS;
                        break;
                case 'g':
                        group = optarg;
                        break;
                case 'm':
                        if (!(set = setmode(optarg)))
                                err("%s: invalid file mode", optarg);
                        mode = getmode(set, 0);
                        break;
                case 'o':
                        owner = optarg;
                        break;
                case 's':
                        dostrip = 1;
                        break;
                case '?':
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;
        if (argc < 2)
                usage();

        /* get group and owner id's */
        if (group && !(gp = getgrnam(group)))
                err("unknown group %s", group);
        if (owner && !(pp = getpwnam(owner)))
                err("unknown user %s", owner);

        no_target = stat(to_name = argv[argc - 1], &to_sb);
        if (!no_target && (to_sb.st_mode & S_IFMT) == S_IFDIR) {
                for (; *argv != to_name; ++argv)
                        install(*argv, to_name, fset, iflags | DIRECTORY);
                exit(0);
        }

        /* can't do file1 file2 directory/file */
        if (argc != 2)
                usage();

        if (!no_target) {
                if (stat(*argv, &from_sb))
                        err("%s: %s", *argv, strerror(errno));
                if (!S_ISREG(to_sb.st_mode))
                        err("%s: %s", to_name, strerror(EFTYPE));
                if (to_sb.st_dev == from_sb.st_dev &&
                    to_sb.st_ino == from_sb.st_ino)
                        err("%s and %s are the same file", *argv, to_name);
                /*
                 * Unlink now... avoid ETXTBSY errors later.  Try and turn
                 * off the append/immutable bits -- if we fail, go ahead,
                 * it might work.
                 */
#define NOCHANGEBITS    (UF_IMMUTABLE | UF_APPEND | SF_IMMUTABLE | SF_APPEND)
                if (to_sb.st_flags & NOCHANGEBITS)
                        (void)chflags(to_name,
                            to_sb.st_flags & ~(NOCHANGEBITS));
                (void)unlink(to_name);
        }
        install(*argv, to_name, fset, iflags);
        exit(0);
}

/*
 * install --
 *      build a path name and install the file
 */
void
install(from_name, to_name, fset, flags)
        char *from_name, *to_name;
        u_long fset;
        u_int flags;
{
        struct stat from_sb, to_sb;
        int devnull, from_fd, to_fd, serrno;
        char *p;

        /* If try to install NULL file to a directory, fails. */
        if (flags & DIRECTORY || strcmp(from_name, _PATH_DEVNULL)) {
                if (stat(from_name, &from_sb))
                        err("%s: %s", from_name, strerror(errno));
                if (!S_ISREG(from_sb.st_mode))
                        err("%s: %s", from_name, strerror(EFTYPE));
                /* Build the target path. */
                if (flags & DIRECTORY) {
                        (void)snprintf(pathbuf, sizeof(pathbuf), "%s/%s",
                            to_name,
                            (p = rindex(from_name, '/')) ? ++p : from_name);
                        to_name = pathbuf;
                }
                devnull = 0;
        } else {
                from_sb.st_flags = 0;   /* XXX */
                devnull = 1;
        }

        /*
         * Unlink now... avoid ETXTBSY errors later.  Try and turn
         * off the append/immutable bits -- if we fail, go ahead,
         * it might work.
         */
        if (stat(to_name, &to_sb) == 0 &&
            to_sb.st_flags & (NOCHANGEBITS))
                (void)chflags(to_name, to_sb.st_flags & ~(NOCHANGEBITS));
        (void)unlink(to_name);

        /* Create target. */
        if ((to_fd = open(to_name,
            O_CREAT | O_WRONLY | O_TRUNC, S_IRUSR | S_IWUSR)) < 0)
                err("%s: %s", to_name, strerror(errno));
        if (!devnull) {
                if ((from_fd = open(from_name, O_RDONLY, 0)) < 0) {
                        (void)unlink(to_name);
                        err("%s: %s", from_name, strerror(errno));
                }
                copy(from_fd, from_name, to_fd, to_name, from_sb.st_size);
                (void)close(from_fd);
        }
        if (dostrip)
                strip(to_name);
        /*
         * Set owner, group, mode for target; do the chown first,
         * chown may lose the setuid bits.
         */
        if ((group || owner) &&
            fchown(to_fd, owner ? pp->pw_uid : -1, group ? gp->gr_gid : -1)) {
                serrno = errno;
                (void)unlink(to_name);
                err("%s: chown/chgrp: %s", to_name, strerror(serrno));
        }
        if (fchmod(to_fd, mode)) {
                serrno = errno;
                (void)unlink(to_name);
                err("%s: chmod: %s", to_name, strerror(serrno));
        }

        /*
         * If provided a set of flags, set them, otherwise, preserve the
         * flags, except for the dump flag.
         */
        if (fchflags(to_fd,
            flags & SETFLAGS ? fset : from_sb.st_flags & ~UF_NODUMP)) {
                serrno = errno;
                (void)unlink(to_name);
                err("%s: chflags: %s", to_name, strerror(serrno));
        }

        (void)close(to_fd);
        if (!docopy && !devnull && unlink(from_name))
                err("%s: %s", from_name, strerror(errno));
}

/*
 * copy --
 *      copy from one file to another
 */
void
copy(from_fd, from_name, to_fd, to_name, size)
        register int from_fd, to_fd;
        char *from_name, *to_name;
        off_t size;
{
        register int nr, nw;
        int serrno;
        char *p, buf[MAXBSIZE];

        /*
         * Mmap and write if less than 8M (the limit is so we don't totally
         * trash memory on big files.  This is really a minor hack, but it
         * wins some CPU back.
         */
        if (size <= 8 * 1048576) {
                if ((p = mmap(NULL, (size_t)size, PROT_READ,
                    0, from_fd, (off_t)0)) == (char *)-1)
                        err("%s: %s", from_name, strerror(errno));
                if (write(to_fd, p, size) != size)
                        err("%s: %s", to_name, strerror(errno));
        } else {
                while ((nr = read(from_fd, buf, sizeof(buf))) > 0)
                        if ((nw = write(to_fd, buf, nr)) != nr) {
                                serrno = errno;
                                (void)unlink(to_name);
                                err("%s: %s",
                                    to_name, strerror(nw > 0 ? EIO : serrno));
                        }
                if (nr != 0) {
                        serrno = errno;
                        (void)unlink(to_name);
                        err("%s: %s", from_name, strerror(serrno));
                }
        }
}

/*
 * strip --
 *      use strip(1) to strip the target file
 */
void
strip(to_name)
        char *to_name;
{
        int serrno, status;

        switch (vfork()) {
        case -1:
                serrno = errno;
                (void)unlink(to_name);
                err("forks: %s", strerror(errno));
        case 0:
                execl(_PATH_STRIP, "strip", to_name, NULL);
                err("%s: %s", _PATH_STRIP, strerror(errno));
        default:
                if (wait(&status) == -1 || status)
                        (void)unlink(to_name);
        }
}

/*
 * usage --
 *      print a usage message and die
 */
void
usage()
{
        (void)fprintf(stderr,
"usage: install [-cs] [-f flags] [-g group] [-m mode] [-o owner] file1 file2;\n\tor file1 ... fileN directory\n");
        exit(1);
}

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#if __STDC__
err(const char *fmt, ...)
#else
err(fmt, va_alist)
        char *fmt;
        va_dcl
#endif
{
        va_list ap;
#if __STDC__
        va_start(ap, fmt);
#else
        va_start(ap);
#endif
        (void)fprintf(stderr, "install: ");
        (void)vfprintf(stderr, fmt, ap);
        va_end(ap);
        (void)fprintf(stderr, "\n");
        exit(1);
        /* NOTREACHED */
}