static void cleanup()
{
if (!initialized)
return;
if (prev_win)
unuse_pack(&prev_win);
if (pack_data) {
struct pack_window *win, *prev;
for (prev = NULL, win = pack_data->windows;
win; prev = win, win = win->next) {
if (win != pack_win)
continue;
if (prev)
prev->next = win->next;
else
pack_data->windows = win->next;
break;
}
}
if (pack_win) {
free(pack_win->base);
free(pack_win);
}
end_packfile();
if (!require_explicit_termination)
dump_branches();
unkeep_all_packs();
initialized = 0;
pack_report();
}
int main(int argc, char *argv[])
{
struct unionfs_addbranch_args addargs;
struct unionfs_rdwrbranch_args rdwrargs;
unsigned long remountdata[3];
fd_set branchlist;
struct stat st;
int fd = -1;
int ret, i;
char *path, resolv_path[PATH_MAX], resolv_bp[PATH_MAX];
char *options = NULL, *actual_path = NULL;
int action;
char *branchpath;
int branchnum;
int unionpos = 1;
int modepos = 2;
progname = argv[0];
/* check that minimum number of args were specified */
if (argc < 3)
usage();
if (argv[1][0] == '-' && argv[1][1] == '-') {
modepos = 1;
unionpos = 2;
} else {
modepos = 2;
unionpos = 1;
}
if (realpath(argv[unionpos], resolv_path) == NULL) {
perror("realpath()");
exit(EXIT_FAILURE);
}
path = resolv_path;
if (strcmp(path, "/") && (path[strlen(path) - 1] == '/')) {
path[strlen(path) - 1] = '\0';
}
if (!strcmp(argv[modepos], "--add")) {
action = ADD;
} else if (!strcmp(argv[modepos], "--remove")) {
action = REMOVE;
} else if (!strcmp(argv[modepos], "--mode")) {
action = MODE;
} else if (!strcmp(argv[modepos], "--list")) {
action = LIST;
} else if (!strcmp(argv[modepos], "--query")) {
action = QUERY;
} else {
usage();
}
if (stat(path, &st) == -1) {
fprintf(stderr, "stat(%s): %s\n", path, strerror(errno));
exit(EXIT_FAILURE);
}
if (find_union(path, &options, &actual_path, 1) < 0) {
fprintf(stderr, "%s is not a valid union.\n", path);
exit(EXIT_FAILURE);
}
branches = parse_options(options);
if (!branches) {
fprintf(stderr, "Could not parse options from /proc/mounts!\n");
exit(EXIT_FAILURE);
}
/* open file on which ioctl will operate (that is actually any file in the union) */
if (action != REMOVE) {
fd = open(path, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "open(%s): %s\n", path,
strerror(errno));
exit(EXIT_FAILURE);
}
}
/* Parse the action's options into something usable, and do it. */
switch (action) {
case ADD:
if (argc < 4)
usage();
/* Default values if the user leaves them unspecified. */
branchnum = 0;
addargs.ab_perms = MAY_READ | MAY_WRITE;
branchpath = NULL;
for (i = 3; i < argc; i++) {
if (argv[i][0] == '-' && argv[i][1] == '-') {
if (!strcmp(argv[i], "--before")) {
i++;
if (i == argc) {
fprintf(stderr,
"%s requires an argument!\n",
argv[i - 1]);
usage();
}
branchnum = get_branch(argv[i]);
if (branchnum == -1) {
fprintf(stderr,
"%s is not a valid branch.\nThe current branch configuration is:\n",
argv[i]);
dump_branches("\t");
}
} else if (!strcmp(argv[i], "--after")) {
i++;
if (i == argc) {
fprintf(stderr,
"%s requires an argument!\n",
argv[i - 1]);
usage();
}
branchnum = get_branch(argv[i]);
if (branchnum == -1) {
fprintf(stderr,
"%s is not a valid branch.\nThe current branch configuration is:\n",
argv[i]);
dump_branches("\t");
}
branchnum++;
} else if (!strcmp(argv[i], "--mode")) {
i++;
if (i == argc) {
fprintf(stderr,
"%s requires an argument!\n",
argv[i - 1]);
usage();
}
if (!strcmp(argv[i], "ro")) {
addargs.ab_perms = MAY_READ;
} else if (!strcmp(argv[i], "rw")) {
addargs.ab_perms =
MAY_READ | MAY_WRITE;
} else {
fprintf(stderr,
"Valid modes are ro and rw you specified: \"%s\"\n",
argv[i]);
usage();
}
} else {
fprintf(stderr, "Unknown option: %s\n",
argv[i]);
usage();
}
} else {
/* The options must go before the path */
if ((i + 1) != argc) {
fprintf(stderr,
"The path of the branch to add must go after all options.\n");
usage();
}
if (branchnum != -1) {
fprintf(stderr,
"%s already exists in the Union\n",
argv[i]);
usage();
}
branchpath = argv[i];
}
}
if (!branchpath) {
fprintf(stderr,
"You must specify the path to add into the union!\n");
usage();
}
if (realpath(branchpath, resolv_bp) == NULL) {
perror("realpath()");
exit(EXIT_FAILURE);
}
addargs.ab_branch = branchnum;
addargs.ab_path = resolv_bp;
errno = 0;
ret = ioctl(fd, UNIONFS_IOCTL_ADDBRANCH, &addargs);
if (ret < 0) {
switch (errno) {
case E2BIG:
fprintf(stderr,
"Unionfs supports only %d branches.\n",
FD_SETSIZE);
break;
}
fprintf(stderr, "Failed to add %s into %s: %s",
branchpath, path, strerror(errno));
exit(EXIT_FAILURE);
}
break;
case MODE:
if (argc != 5) {
usage();
}
if (!strcmp(argv[4], "ro")) {
rdwrargs.rwb_perms = MAY_READ;
branchnum = 3;
} else if (!strcmp(argv[4], "rw")) {
rdwrargs.rwb_perms = MAY_READ | MAY_WRITE;
branchnum = 3;
} else if (!strcmp(argv[3], "ro")) {
rdwrargs.rwb_perms = MAY_READ;
branchnum = 4;
} else if (!strcmp(argv[3], "rw")) {
rdwrargs.rwb_perms = MAY_READ | MAY_WRITE;
branchnum = 4;
} else {
usage();
}
if (realpath(argv[branchnum], resolv_bp) == NULL) {
perror("realpath()");
exit(EXIT_FAILURE);
}
branchpath = resolv_bp;
/* Set a branches writeable status. */
rdwrargs.rwb_branch = get_branch(branchpath);
if (rdwrargs.rwb_branch == -1) {
fprintf(stderr,
"%s is not a valid branch.\nThe current branch configuration is:\n",
branchpath);
dump_branches("\t");
exit(EXIT_FAILURE);
}
ret = ioctl(fd, UNIONFS_IOCTL_RDWRBRANCH, &rdwrargs);
if (ret < 0) {
fprintf(stderr,
"Failed to set permissions for %s in %s: %s",
branchpath, path, strerror(errno));
exit(EXIT_FAILURE);
}
goto out;
break;
case REMOVE:
if (argc != 4)
usage();
if (realpath(argv[3], resolv_bp) == NULL) {
perror("realpath()");
exit(EXIT_FAILURE);
}
branchpath = resolv_bp;
branchnum = get_branch(branchpath);
if (branchnum == -1) {
fprintf(stderr,
"%s is not a valid branch.\nThe current branch configuration is:\n",
branchpath);
dump_branches("\t");
exit(EXIT_FAILURE);
}
errno = 0;
remountdata[0] = UNIONFS_REMOUNT_MAGIC;
remountdata[1] = UNIONFS_IOCTL_DELBRANCH;
remountdata[2] = branchnum;
ret =
mount("unionfs", actual_path, "unionfs",
MS_REMOUNT | MS_MGC_VAL, remountdata);
if (ret < 0) {
fprintf(stderr, "Failed to remove %s from %s: %s",
branchpath, path, strerror(errno));
exit(EXIT_FAILURE);
}
break;
case LIST:
dump_branches("\t");
break;
case QUERY:
if (argc != 3) {
usage();
}
if ((fd = open(argv[unionpos], O_RDONLY)) < 0) {
fprintf(stderr,
"Unable to open file %s : %s",
argv[unionpos], strerror(errno));
exit(EXIT_FAILURE);
}
ret = ioctl(fd, UNIONFS_IOCTL_QUERYFILE, &branchlist);
if (ret < 0) {
fprintf(stderr,
"Unable to retrieve list of branches for file %s : %s\n",
argv[unionpos], strerror(errno));
exit(EXIT_FAILURE);
}
for (i = 0; i <= ret; i++) {
char r, w;
r = (branchperms[i] & MAY_READ) ? 'r' : '-';
w = (branchperms[i] & MAY_WRITE) ? 'w' : '-';
if (FD_ISSET(i, &branchlist))
printf("%s\t%s (%c%c)\n", argv[unionpos],
branches[i], r, w);
}
break;
}
out:
if (fd != -1)
close(fd);
exit(EXIT_SUCCESS);
}