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Merge pull request #174 from dsheets/transfused-prepare-mounts

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transfused: introduce automatic mount point preparation
This commit is contained in:
Justin Cormack 2016-06-03 17:33:21 +01:00
commit b6765bb5cd
1 changed files with 80 additions and 0 deletions
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80
alpine/packages/transfused/transfused.c
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@ -4,10 +4,12 @@
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <libgen.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <pthread.h>
@ -438,6 +440,82 @@ void start_writer(connection_t * connection, int fuse) {
connection->mount_point);
}
char * alloc_dirname(connection_t * conn, char * path) {
size_t len = strlen(path) + 1;
char * input = must_malloc("alloc_dirname input", len);
char * output = must_malloc("alloc_dirname output", len);
char * dir;
strlcpy(input, path, len);
dir = dirname(input);
if (dir == NULL)
die(1, conn->params, "", "Couldn't get dirname of %s: ", path);
strcpy(output, dir);
free(input);
return output;
}
void mkdir_p(connection_t * conn, char * path) {
char * parent;
if (mkdir(path, 0700)) switch (errno) {
case ENOENT:
parent = alloc_dirname(conn, path);
mkdir_p(conn, parent);
free(parent);
if (mkdir(path, 0700))
die(1, conn->params, "", "Couldn't create directory %s: ", path);
break;
default:
die(1, conn->params, "", "Couldn't create directory %s: ", path);
}
}
int is_next_child_ok(connection_t * conn, DIR * dir) {
struct dirent * child;
errno = 0;
child = readdir(dir);
if (child == NULL) {
if (errno != 0)
die(1, conn->params, "", "Couldn't read mount point %s: ",
conn->mount_point);
else return 0;
} else
if (strcmp(".", child->d_name) != 0 && strcmp("..", child->d_name) != 0)
die(1, conn->params, NULL, "Couldn't mount on %s: %s exists",
conn->mount_point, child->d_name);
return 1;
}
// The leaf may exist but must be empty. Any proper path prefix may exist.
void prepare_mount_point(connection_t * conn) {
DIR * dir;
char * mount_point = conn->mount_point;
dir = opendir(mount_point);
if (dir != NULL) {
if (is_next_child_ok(conn, dir))
if (is_next_child_ok(conn, dir)) {
if (is_next_child_ok(conn, dir))
die(1, conn->params, "", "Couldn't mount on %s: not empty",
mount_point);
else return;
}
if (closedir(dir))
die(1, conn->params, "", "Couldn't close mount point %s: ", mount_point);
} else {
switch (errno) {
case ENOENT: break;
default:
die(1, conn->params, "", "Couldn't open mount point %s: ", mount_point);
}
}
mkdir_p(conn, mount_point);
}
void * mount_connection(connection_t * conn) {
int optc;
char ** optv;
@ -451,6 +529,8 @@ void * mount_connection(connection_t * conn) {
optv = read_opts(conn, buf);
prepare_mount_point(conn);
for (optc = 0; optv[optc] != NULL; optc++) {}
fuse = get_fuse_sock(conn, optc, optv);