block/ssh: Implement .bdrv_refresh_filename()

This requires some changes to keep iotests 104 and 207 working.

qemu-img info in 104 will now return a filename including the user name
and the port, which need to be filtered by adjusting REMOTE_TEST_DIR in
common.rc.  This additional information has to be marked optional,
however (which is simple as REMOTE_TEST_DIR is a regex), because
otherwise 197 and 215 would fail: They use it (indirectly) to filter
qemu-img create output which contains a backing filename they have
passed to it -- which probably does not contain a user name or port
number.

The problem in 207 is a nice one to have: qemu-img info used to return
json:{} filenames, but with this patch it returns nice plain ones.  We
now need to adjust the filtering to hide the user name (and port number
while we are at it).  The simplest way to do this is to include both in
iotests.remote_filename() so that bdrv_refresh_filename() will not
change it, and then iotests.img_info_log() will filter it correctly
automatically.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Tested-by: Richard W.M. Jones <rjones@redhat.com>
Message-id: 20190225190828.17726-2-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>

1 files changed, 47 insertions, 5 deletions

diff --git a/block/ssh.c b/block/ssh.c
index 8592491..2eaeab8 100644
--- a/block/ssh.c
+++ b/block/ssh.c
@@ -75,6 +75,14 @@ typedef struct BDRVSSHState {
 
     /* Used to warn if 'flush' is not supported. */
     bool unsafe_flush_warning;
+
+    /*
+     * Store the user name for ssh_refresh_filename() because the
+     * default depends on the system you are on -- therefore, when we
+     * generate a filename, it should always contain the user name we
+     * are actually using.
+     */
+    char *user;
 } BDRVSSHState;
 
 static void ssh_state_init(BDRVSSHState *s)
@@ -87,6 +95,8 @@ static void ssh_state_init(BDRVSSHState *s)
 
 static void ssh_state_free(BDRVSSHState *s)
 {
+    g_free(s->user);
+
     if (s->sftp_handle) {
         libssh2_sftp_close(s->sftp_handle);
     }
@@ -628,14 +638,13 @@ static int connect_to_ssh(BDRVSSHState *s, BlockdevOptionsSsh *opts,
                           int ssh_flags, int creat_mode, Error **errp)
 {
     int r, ret;
-    const char *user;
     long port = 0;
 
     if (opts->has_user) {
-        user = opts->user;
+        s->user = g_strdup(opts->user);
     } else {
-        user = g_get_user_name();
-        if (!user) {
+        s->user = g_strdup(g_get_user_name());
+        if (!s->user) {
             error_setg_errno(errp, errno, "Can't get user name");
             ret = -errno;
             goto err;
@@ -685,7 +694,7 @@ static int connect_to_ssh(BDRVSSHState *s, BlockdevOptionsSsh *opts,
     }
 
     /* Authenticate. */
-    ret = authenticate(s, user, errp);
+    ret = authenticate(s, s->user, errp);
     if (ret < 0) {
         goto err;
     }
@@ -1242,6 +1251,38 @@ static int coroutine_fn ssh_co_truncate(BlockDriverState *bs, int64_t offset,
     return ssh_grow_file(s, offset, errp);
 }
 
+static void ssh_refresh_filename(BlockDriverState *bs)
+{
+    BDRVSSHState *s = bs->opaque;
+    const char *path, *host_key_check;
+    int ret;
+
+    /*
+     * None of these options can be represented in a plain "host:port"
+     * format, so if any was given, we have to abort.
+     */
+    if (s->inet->has_ipv4 || s->inet->has_ipv6 || s->inet->has_to ||
+        s->inet->has_numeric)
+    {
+        return;
+    }
+
+    path = qdict_get_try_str(bs->full_open_options, "path");
+    assert(path); /* mandatory option */
+
+    host_key_check = qdict_get_try_str(bs->full_open_options, "host_key_check");
+
+    ret = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
+                   "ssh://%s@%s:%s%s%s%s",
+                   s->user, s->inet->host, s->inet->port, path,
+                   host_key_check ? "?host_key_check=" : "",
+                   host_key_check ?: "");
+    if (ret >= sizeof(bs->exact_filename)) {
+        /* An overflow makes the filename unusable, so do not report any */
+        bs->exact_filename[0] = '\0';
+    }
+}
+
 static const char *const ssh_strong_runtime_opts[] = {
     "host",
     "port",
@@ -1268,6 +1309,7 @@ static BlockDriver bdrv_ssh = {
     .bdrv_getlength               = ssh_getlength,
     .bdrv_co_truncate             = ssh_co_truncate,
     .bdrv_co_flush_to_disk        = ssh_co_flush,
+    .bdrv_refresh_filename        = ssh_refresh_filename,
     .create_opts                  = &ssh_create_opts,
     .strong_runtime_opts          = ssh_strong_runtime_opts,
 };