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Plugin for importing VFS content

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This new vfs_import plugin allows a VFS instance to be populated during
construction using a sub-VFS configured in an '<import>' configuration
node. This allows the ram_fs File_system server to be replaced by the
VFS server by reimplementing the ram_fs 'content' feature.  At the
moment the copying of symlinks is not enabled, and the resources
obtained by the import file-system may not be freed after the import is
finished.

Fix #2906
This commit is contained in:
Emery Hemingway
2018-07-05 16:50:14 +02:00
committed by Christian Helmuth
parent f6c47a46c6
commit 59ac5b10c7
10 changed files with 488 additions and 35 deletions
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49
repos/gems/include/gems/vfs.h
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@@ -71,7 +71,9 @@ struct Genode::Directory : Noncopyable, Interface
Vfs::Directory_service::Dirent_type type() const { return _dirent.type; }
};
typedef String<256> Path;
enum { MAX_PATH_LEN = 256 };
typedef String<MAX_PATH_LEN> Path;
static Path join(Path const &x, Path const &y)
{
@@ -232,6 +234,51 @@ struct Genode::Directory : Noncopyable, Interface
throw Nonexistent_file();
return stat.size;
}
/**
* Return symlink content at specified directory-relative path
*
* \throw Nonexistent_file symlink at path does not exist or
* access is denied
*
*/
Path read_symlink(Path const &rel_path) const
{
using namespace Vfs;
Vfs_handle *link_handle;
auto open_res = _nonconst_fs().openlink(
join(_path, rel_path).string(),
false, &link_handle, _alloc);
if (open_res != Directory_service::OPENLINK_OK)
throw Nonexistent_file();
Vfs_handle::Guard guard(link_handle);
char buf[MAX_PATH_LEN];
Vfs::file_size count = sizeof(buf)-1;
Vfs::file_size out_count = 0;
while (!link_handle->fs().queue_read(link_handle, count)) {
_ep.wait_and_dispatch_one_io_signal();
}
File_io_service::Read_result result;
for (;;) {
result = link_handle->fs().complete_read(
link_handle, buf, count, out_count);
if (result != File_io_service::READ_QUEUED)
break;
_ep.wait_and_dispatch_one_io_signal();
};
if (result != File_io_service::READ_OK)
throw Nonexistent_file();
return Path(Genode::Cstring(buf, out_count));
}
};