From: Steve Dickson <steved@redhat.com>
Date: Mon, 27 Sep 2010 13:35:26 +0000 (-0400)
Subject: libnfs.a: Remove support/nfs/fstab.c
X-Git-Tag: nfs-utils-1-2-3~13
X-Git-Url: https://git.decadent.org.uk/gitweb/?a=commitdiff_plain;h=5341111d4b34bcd1b1263d5ed215cbe375aa9314;p=nfs-utils.git

libnfs.a: Remove support/nfs/fstab.c

Signed-off-by: Steve Dickson <steved@redhat.com>
---

diff --git a/support/nfs/fstab.c b/support/nfs/fstab.c
deleted file mode 100644
index b4f8710..0000000
--- a/support/nfs/fstab.c
+++ /dev/null
@@ -1,554 +0,0 @@
-/* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
- * - added Native Language Support
- * Sun Mar 21 1999 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
- * - fixed strerr(errno) in gettext calls
- *
- * 2006-06-08 Amit Gud <agud@redhat.com>
- * - Moved code to nfs-utils/support/nfs from util-linux/mount.
- */
-
-#include <errno.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <mntent.h>
-
-#include "fstab.h"
-#include "xcommon.h"
-#include "nfs_mntent.h"
-#include "nfs_paths.h"
-#include "nls.h"
-
-#define LOCK_TIMEOUT	10
-#define streq(s, t)	(strcmp ((s), (t)) == 0)
-#define PROC_MOUNTS		"/proc/mounts"
-
-extern int verbose;
-
-/* Information about mtab. ------------------------------------*/
-static int have_mtab_info = 0;
-static int var_mtab_does_not_exist = 0;
-static int var_mtab_is_a_symlink = 0;
-
-static void
-get_mtab_info(void) {
-	struct stat mtab_stat;
-
-	if (!have_mtab_info) {
-		if (lstat(MOUNTED, &mtab_stat))
-			var_mtab_does_not_exist = 1;
-		else if (S_ISLNK(mtab_stat.st_mode))
-			var_mtab_is_a_symlink = 1;
-		have_mtab_info = 1;
-	}
-}
-
-int
-mtab_does_not_exist(void) {
-	get_mtab_info();
-	return var_mtab_does_not_exist;
-}
-
-static int
-mtab_is_a_symlink(void) {
-        get_mtab_info();
-        return var_mtab_is_a_symlink;
-}
-
-int
-mtab_is_writable() {
-	int fd;
-
-	/* Should we write to /etc/mtab upon an update?
-	   Probably not if it is a symlink to /proc/mounts, since that
-	   would create a file /proc/mounts in case the proc filesystem
-	   is not mounted. */
-	if (mtab_is_a_symlink())
-		return 0;
-
-	fd = open(MOUNTED, O_RDWR | O_CREAT, 0644);
-	if (fd >= 0) {
-		close(fd);
-		return 1;
-	} else
-		return 0;
-}
-
-/* Contents of mtab and fstab ---------------------------------*/
-
-struct mntentchn mounttable;
-static int got_mtab = 0;
-struct mntentchn fstab;
-static int got_fstab = 0;
-
-static void read_mounttable(void);
-static void read_fstab(void);
-
-static struct mntentchn *
-mtab_head(void) {
-	if (!got_mtab)
-		read_mounttable();
-	return &mounttable;
-}
-
-static struct mntentchn *
-fstab_head(void)
-{
-	if (!got_fstab)
-		read_fstab();
-	return &fstab;
-}
-
-#if 0
-static void
-my_free(const void *s) {
-	if (s)
-		free((void *) s);
-}
-
-static void
-discard_mntentchn(struct mntentchn *mc0) {
-	struct mntentchn *mc, *mc1;
-
-	for (mc = mc0->nxt; mc && mc != mc0; mc = mc1) {
-		mc1 = mc->nxt;
-		my_free(mc->m.mnt_fsname);
-		my_free(mc->m.mnt_dir);
-		my_free(mc->m.mnt_type);
-		my_free(mc->m.mnt_opts);
-		free(mc);
-	}
-}
-#endif
-
-static void
-read_mntentchn(mntFILE *mfp, const char *fnam, struct mntentchn *mc0) {
-	struct mntentchn *mc = mc0;
-	struct mntent *mnt;
-
-	while ((mnt = nfs_getmntent(mfp)) != NULL) {
-		if (!streq(mnt->mnt_type, MNTTYPE_IGNORE)) {
-			mc->nxt = (struct mntentchn *) xmalloc(sizeof(*mc));
-			mc->nxt->prev = mc;
-			mc = mc->nxt;
-			mc->m = *mnt;
-			mc->nxt = mc0;
-		}
-	}
-	mc0->prev = mc;
-	if (ferror(mfp->mntent_fp)) {
-		int errsv = errno;
-		nfs_error(_("warning: error reading %s: %s"),
-		      fnam, strerror (errsv));
-		mc0->nxt = mc0->prev = NULL;
-	}
-	nfs_endmntent(mfp);
-}
-
-/*
- * Read /etc/mtab.  If that fails, try /proc/mounts.
- * This produces a linked list. The list head mounttable is a dummy.
- * Return 0 on success.
- */
-static void
-read_mounttable() {
-        mntFILE *mfp;
-        const char *fnam;
-        struct mntentchn *mc = &mounttable;
-
-        got_mtab = 1;
-        mc->nxt = mc->prev = NULL;
-
-        fnam = MOUNTED;
-        mfp = nfs_setmntent (fnam, "r");
-        if (mfp == NULL || mfp->mntent_fp == NULL) {
-                int errsv = errno;
-                fnam = PROC_MOUNTS;
-                mfp = nfs_setmntent (fnam, "r");
-                if (mfp == NULL || mfp->mntent_fp == NULL) {
-                        nfs_error(_("warning: can't open %s: %s"),
-                              MOUNTED, strerror (errsv));
-                        return;
-                }
-                if (verbose)
-                        printf (_("mount: could not open %s - "
-                                  "using %s instead\n"),
-                                MOUNTED, PROC_MOUNTS);
-        }
-        read_mntentchn(mfp, fnam, mc);
-}
-
-static void
-read_fstab()
-{
-	mntFILE *mfp = NULL;
-	const char *fnam;
-	struct mntentchn *mc = &fstab;
-
-	got_fstab = 1;
-	mc->nxt = mc->prev = NULL;
-
-	fnam = _PATH_FSTAB;
-	mfp = nfs_setmntent (fnam, "r");
-	if (mfp == NULL || mfp->mntent_fp == NULL) {
-		int errsv = errno;
-		nfs_error(_("warning: can't open %s: %s"),
-			  _PATH_FSTAB, strerror (errsv));
-		return;
-	}
-	read_mntentchn(mfp, fnam, mc);
-}
-
-/*
- * Given the directory name NAME, and the place MCPREV we found it last time,
- * try to find more occurrences.
- */ 
-struct mntentchn *
-getmntdirbackward (const char *name, struct mntentchn *mcprev) {
-	struct mntentchn *mc, *mc0;
-
-	mc0 = mtab_head();
-	if (!mcprev)
-		mcprev = mc0;
-	for (mc = mcprev->prev; mc && mc != mc0; mc = mc->prev)
-		if (streq(mc->m.mnt_dir, name))
-			return mc;
-	return NULL;
-}
-
-/*
- * Given the device name NAME, and the place MCPREV we found it last time,
- * try to find more occurrences.
- */ 
-struct mntentchn *
-getmntdevbackward (const char *name, struct mntentchn *mcprev) {
-	struct mntentchn *mc, *mc0;
-
-	mc0 = mtab_head();
-	if (!mcprev)
-		mcprev = mc0;
-	for (mc = mcprev->prev; mc && mc != mc0; mc = mc->prev)
-		if (streq(mc->m.mnt_fsname, name))
-			return mc;
-	return NULL;
-}
-
-/* Find the dir FILE in fstab.  */
-struct mntentchn *
-getfsfile (const char *file)
-{
-	struct mntentchn *mc, *mc0;
-
-	mc0 = fstab_head();
-	for (mc = mc0->nxt; mc && mc != mc0; mc = mc->nxt)
-		if (streq(mc->m.mnt_dir, file))
-			return mc;
-	return NULL;
-}
-
-/* Find the device SPEC in fstab.  */
-struct mntentchn *
-getfsspec (const char *spec)
-{
-	struct mntentchn *mc, *mc0;
-
-	mc0 = fstab_head();
-	for (mc = mc0->nxt; mc && mc != mc0; mc = mc->nxt)
-		if (streq(mc->m.mnt_fsname, spec))
-			return mc;
-	return NULL;
-}
-
-/* Updating mtab ----------------------------------------------*/
-
-/* Flag for already existing lock file. */
-static int we_created_lockfile = 0;
-static int lockfile_fd = -1;
-
-/* Flag to indicate that signals have been set up. */
-static int signals_have_been_setup = 0;
-
-/* Ensure that the lock is released if we are interrupted.  */
-extern char *strsignal(int sig);	/* not always in <string.h> */
-
-static void
-handler (int sig) {
-     die(EX_USER, "%s", strsignal(sig));
-}
-
-static void
-setlkw_timeout (int sig) {
-     /* nothing, fcntl will fail anyway */
-}
-
-/* Remove lock file.  */
-void
-unlock_mtab (void) {
-	if (we_created_lockfile) {
-		close(lockfile_fd);
-		lockfile_fd = -1;
-		unlink (MOUNTED_LOCK);
-		we_created_lockfile = 0;
-	}
-}
-
-/* Create the lock file.
-   The lock file will be removed if we catch a signal or when we exit. */
-/* The old code here used flock on a lock file /etc/mtab~ and deleted
-   this lock file afterwards. However, as rgooch remarks, that has a
-   race: a second mount may be waiting on the lock and proceed as
-   soon as the lock file is deleted by the first mount, and immediately
-   afterwards a third mount comes, creates a new /etc/mtab~, applies
-   flock to that, and also proceeds, so that the second and third mount
-   now both are scribbling in /etc/mtab.
-   The new code uses a link() instead of a creat(), where we proceed
-   only if it was us that created the lock, and hence we always have
-   to delete the lock afterwards. Now the use of flock() is in principle
-   superfluous, but avoids an arbitrary sleep(). */
-
-/* Where does the link point to? Obvious choices are mtab and mtab~~.
-   HJLu points out that the latter leads to races. Right now we use
-   mtab~.<pid> instead. Use 20 as upper bound for the length of %d. */
-#define MOUNTLOCK_LINKTARGET		MOUNTED_LOCK "%d"
-#define MOUNTLOCK_LINKTARGET_LTH	(sizeof(MOUNTED_LOCK)+20)
-
-void
-lock_mtab (void) {
-	int tries = 100000, i;
-	char linktargetfile[MOUNTLOCK_LINKTARGET_LTH];
-
-	at_die = unlock_mtab;
-
-	if (!signals_have_been_setup) {
-		int sig = 0;
-		struct sigaction sa;
-
-		sa.sa_handler = handler;
-		sa.sa_flags = 0;
-		sigfillset (&sa.sa_mask);
-  
-		while (sigismember (&sa.sa_mask, ++sig) != -1
-		       && sig != SIGCHLD) {
-			if (sig == SIGALRM)
-				sa.sa_handler = setlkw_timeout;
-			else
-				sa.sa_handler = handler;
-			sigaction (sig, &sa, (struct sigaction *) 0);
-		}
-		signals_have_been_setup = 1;
-	}
-
-	sprintf(linktargetfile, MOUNTLOCK_LINKTARGET, getpid ());
-
-	i = open (linktargetfile, O_WRONLY|O_CREAT, 0);
-	if (i < 0) {
-		int errsv = errno;
-		/* linktargetfile does not exist (as a file)
-		   and we cannot create it. Read-only filesystem?
-		   Too many files open in the system?
-		   Filesystem full? */
-		die (EX_FILEIO, _("can't create lock file %s: %s "
-						  "(use -n flag to override)"),
-			 linktargetfile, strerror (errsv));
-	}
-	close(i);
-	
-	/* Repeat until it was us who made the link */
-	while (!we_created_lockfile) {
-		struct flock flock;
-		int errsv, j;
-
-		j = link(linktargetfile, MOUNTED_LOCK);
-		errsv = errno;
-
-		if (j == 0)
-			we_created_lockfile = 1;
-
-		if (j < 0 && errsv != EEXIST) {
-			(void) unlink(linktargetfile);
-			die (EX_FILEIO, _("can't link lock file %s: %s "
-			     "(use -n flag to override)"),
-			     MOUNTED_LOCK, strerror (errsv));
-		}
-
-		lockfile_fd = open (MOUNTED_LOCK, O_WRONLY);
-
-		if (lockfile_fd < 0) {
-			int errsv = errno;
-			/* Strange... Maybe the file was just deleted? */
-			if (errno == ENOENT && tries-- > 0) {
-				if (tries % 200 == 0)
-					usleep(30);
-				continue;
-			}
-			(void) unlink(linktargetfile);
-			die (EX_FILEIO, _("can't open lock file %s: %s "
-			     "(use -n flag to override)"),
-			     MOUNTED_LOCK, strerror (errsv));
-		}
-
-		flock.l_type = F_WRLCK;
-		flock.l_whence = SEEK_SET;
-		flock.l_start = 0;
-		flock.l_len = 0;
-
-		if (j == 0) {
-			/* We made the link. Now claim the lock. */
-			if (fcntl (lockfile_fd, F_SETLK, &flock) == -1) {
-				if (verbose) {
-				    int errsv = errno;
-				    printf(_("Can't lock lock file %s: %s\n"),
-					   MOUNTED_LOCK, strerror (errsv));
-				}
-				/* proceed anyway */
-			}
-			(void) unlink(linktargetfile);
-		} else {
-			static int tries = 0;
-
-			/* Someone else made the link. Wait. */
-			alarm(LOCK_TIMEOUT);
-			if (fcntl (lockfile_fd, F_SETLKW, &flock) == -1) {
-				int errsv = errno;
-				(void) unlink(linktargetfile);
-				die (EX_FILEIO, _("can't lock lock file %s: %s"),
-				     MOUNTED_LOCK, (errno == EINTR) ?
-				     _("timed out") : strerror (errsv));
-			}
-			alarm(0);
-			/* Limit the number of iterations - maybe there
-			   still is some old /etc/mtab~ */
-			++tries;
-			if (tries % 200 == 0)
-			   usleep(30);
-			if (tries > 100000) {
-				(void) unlink(linktargetfile);
-				close(lockfile_fd);
-				die (EX_FILEIO, _("Cannot create link %s\n"
-						  "Perhaps there is a stale lock file?\n"),
-					 MOUNTED_LOCK);
- 			}
-			close(lockfile_fd);
-		}
-	}
-}
-
-/*
- * Update the mtab.
- *  Used by umount with null INSTEAD: remove the last DIR entry.
- *  Used by mount upon a remount: update option part,
- *   and complain if a wrong device or type was given.
- *   [Note that often a remount will be a rw remount of /
- *    where there was no entry before, and we'll have to believe
- *    the values given in INSTEAD.]
- */
-
-void
-update_mtab (const char *dir, struct mntent *instead)
-{
-	mntFILE *mfp, *mftmp;
-	const char *fnam = MOUNTED;
-	struct mntentchn mtabhead;	/* dummy */
-	struct mntentchn *mc, *mc0, *absent = NULL;
-
-	if (mtab_does_not_exist() || !mtab_is_writable())
-		return;
-
-	lock_mtab();
-
-	/* having locked mtab, read it again */
-	mc0 = mc = &mtabhead;
-	mc->nxt = mc->prev = NULL;
-
-	mfp = nfs_setmntent(fnam, "r");
-	if (mfp == NULL || mfp->mntent_fp == NULL) {
-		int errsv = errno;
-		nfs_error (_("cannot open %s (%s) - mtab not updated"),
-		       fnam, strerror (errsv));
-		goto leave;
-	}
-
-	read_mntentchn(mfp, fnam, mc);
-
-	/* find last occurrence of dir */
-	for (mc = mc0->prev; mc && mc != mc0; mc = mc->prev)
-		if (streq(mc->m.mnt_dir, dir))
-			break;
-	if (mc && mc != mc0) {
-		if (instead == NULL) {
-			/* An umount - remove entry */
-			if (mc && mc != mc0) {
-				mc->prev->nxt = mc->nxt;
-				mc->nxt->prev = mc->prev;
-				free(mc);
-			}
-		} else {
-			/* A remount */
-			mc->m.mnt_opts = instead->mnt_opts;
-		}
-	} else if (instead) {
-		/* not found, add a new entry */
-		absent = xmalloc(sizeof(*absent));
-		absent->m = *instead;
-		absent->nxt = mc0;
-		absent->prev = mc0->prev;
-		mc0->prev = absent;
-		if (mc0->nxt == NULL)
-			mc0->nxt = absent;
-	}
-
-	/* write chain to mtemp */
-	mftmp = nfs_setmntent (MOUNTED_TEMP, "w");
-	if (mftmp == NULL || mftmp->mntent_fp == NULL) {
-		int errsv = errno;
-		nfs_error (_("cannot open %s (%s) - mtab not updated"),
-		       MOUNTED_TEMP, strerror (errsv));
-		goto leave;
-	}
-
-	for (mc = mc0->nxt; mc && mc != mc0; mc = mc->nxt) {
-		if (nfs_addmntent(mftmp, &(mc->m)) == 1) {
-			int errsv = errno;
-			die (EX_FILEIO, _("error writing %s: %s"),
-			     MOUNTED_TEMP, strerror (errsv));
-		}
-	}
-
-#if 0
-	/* the chain might have strings copied from 'instead',
-	 * so we cannot safely free it.
-	 * And there is no need anyway because we are going to exit
-	 * shortly.  So just don't call discard_mntentchn....
-	 */
-	discard_mntentchn(mc0);
-#endif
-	if (fchmod (fileno (mftmp->mntent_fp),
-		    S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) < 0) {
-		int errsv = errno;
-		fprintf(stderr, _("error changing mode of %s: %s\n"),
-			MOUNTED_TEMP, strerror (errsv));
-	}
-	nfs_endmntent (mftmp);
-
-	{ /*
-	   * If mount is setuid and some non-root user mounts sth,
-	   * then mtab.tmp might get the group of this user. Copy uid/gid
-	   * from the present mtab before renaming.
-	   */
-	    struct stat sbuf;
-	    if (stat (MOUNTED, &sbuf) == 0)
-		chown (MOUNTED_TEMP, sbuf.st_uid, sbuf.st_gid);
-	}
-
-	/* rename mtemp to mtab */
-	if (rename (MOUNTED_TEMP, MOUNTED) < 0) {
-		int errsv = errno;
-		fprintf(stderr, _("can't rename %s to %s: %s\n"),
-			MOUNTED_TEMP, MOUNTED, strerror(errsv));
-	}
-
- leave:
-	unlock_mtab();
-}