AppFS
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Comment:More work towards a writable solution
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SHA1: 1adf504f9a4e6eb2cc3b4657d6bb9fe8b8ec9667
User & Date: rkeene on 2014-11-09 09:04:33
Other Links: branch diff | manifest | tags
Context
2014-11-09
09:10
Removed spurious deletes and fixed permissions on version directory check-in: 7d728e1078 user: rkeene tags: tcl-ops
09:04
More work towards a writable solution check-in: 1adf504f9a user: rkeene tags: tcl-ops
08:01
Added a truncate action check-in: 8ea4ed266f user: rkeene tags: tcl-ops
Changes
Hide Diffs Side-by-Side Diffs Ignore Whitespace Patch

Modified appfsd.c from [6a9a58fb18] to [070b2bd8e3].

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	return(write_ret);
}

static int appfs_fuse_mknod(const char *path, mode_t mode, dev_t device) {
	char *real_path;
	int mknod_ret;

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	if ((mode & S_IFCHR) == S_IFCHR) {
		return(-EPERM);
	}

	if ((mode & S_IFBLK) == S_IFBLK) {
		return(-EPERM);
	}
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	return(0);
}

static int appfs_fuse_create(const char *path, mode_t mode, struct fuse_file_info *fi) {
	int fd;
	int chmod_ret;

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	fd = appfs_fuse_open(path, fi);
	if (fd < 0) {
		return(fd);
	}

	chmod_ret = fchmod(fd, mode);
	if (chmod_ret != 0) {
		close(fd);

		return(-EIO);
	}

	return(fd);
}

static int appfs_fuse_truncate(const char *path, off_t size) {
	char *real_path;
	int truncate_ret;

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	real_path = appfs_localpath(path);
	if (real_path == NULL) {
		return(-EIO);
	}

	truncate_ret = truncate(real_path, size);

	free(real_path);

	if (truncate_ret != 0) {
		return(errno * -1);
	}

	return(truncate_ret);
	return(0);
}

static int appfs_fuse_unlink_rmdir(const char *path) {
	Tcl_Interp *interp;
	int tcl_ret;

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}

	tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::unlinkpath", path);
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::unlinkpath(%s) failed.", path);
		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));

		return(-EIO);
	}

	return(0);
}

static int appfs_fuse_mkdir(const char *path, mode_t mode) {
	char *real_path;
	int mkdir_ret;

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	real_path = appfs_prepare_to_create(path);
	if (real_path == NULL) {
		return(-EIO);
	}

	mkdir_ret = mkdir(real_path, mode);

	free(real_path);

	if (mkdir_ret != 0) {
		if (errno != EEXIST) {
			return(errno * -1);
		}
	}

	return(0);
}

/*
 * SQLite3 mode: Execute raw SQL and return success or failure
 */
static int appfs_sqlite3(const char *sql) {
	Tcl_Interp *interp;
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	.open      = appfs_fuse_open,
	.release   = appfs_fuse_close,
	.read      = appfs_fuse_read,
	.write     = appfs_fuse_write,
	.mknod     = appfs_fuse_mknod,
	.create    = appfs_fuse_create,
	.truncate  = appfs_fuse_truncate,
	.unlink    = appfs_fuse_unlink_rmdir,
	.rmdir     = appfs_fuse_unlink_rmdir,
	.mkdir     = appfs_fuse_mkdir,
};

/*
 * FUSE option parsing callback
 */
static int appfs_fuse_opt_cb(void *data, const char *arg, int key, struct fuse_args *outargs) {
	static int seen_cachedir = 0;
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Modified appfsd.tcl from [3cd77a5342] to [d0837729e0].

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				if {[info exists pathinfo(package)] && [info exists pathinfo(hostname)] && [info exists pathinfo(file)]} {
					set dir [_localpath $pathinfo(package) $pathinfo(hostname) $pathinfo(file)]
					foreach file [glob -nocomplain -tails -directory $dir -types {d f l} {{.,}*}] {
						if {$file == "." || $file == ".."} {
							continue
						}

						if {[string match "*.APPFS.WHITEOUT" $file]} {
							set remove [string range $file 0 end-15]
							set idx [lsearch -exact $retval $remove]
							if {$idx != -1} {
								set retval [lreplace $retval $idx $idx]
							}
							continue
						}

						if {[lsearch -exact $retval $file] != -1} {
							continue
						}

						lappend retval $file
					}
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					if {[info exists pathinfo(package_sha1)] && $pathinfo(package_sha1) != ""} {
						set retval(type) directory
						set retval(childcount) 2;
					}
				}
			}
			"files" {

				set retval(packaged) 1

				set localpath [_localpath $pathinfo(package) $pathinfo(hostname) $pathinfo(file)]

				set retval(localpath) $localpath

				if {![file exists "${localpath}.APPFS.WHITEOUT"]} {
				if {[file exists $localpath]} {
					catch {
						file lstat $localpath localpathinfo
						set retval(time) $localpathinfo(mtime)
					if {[file exists $localpath]} {
						set retval(is_localfile) 1
						catch {
							file lstat $localpath localpathinfo
							set retval(time) $localpathinfo(mtime)

						switch -- $localpathinfo(type) {
							"directory" {
								set retval(type) "directory"
								set retval(childcount) 2
							}
							"file" {
								set retval(type) "file"
								set retval(size) $localpathinfo(size)
								if {[file executable $localpath]} {
									set retval(perms) "x"
								} else {
									set retval(perms) ""
								}
							}
							"link" {
								set retval(type) "symlink"
								set retval(source) [file readlink $localpath]
							}
						}
					} err
				} else {
					set work [split $pathinfo(file) "/"]
					set directory [join [lrange $work 0 end-1] "/"]
					set file [lindex $work end]
					::appfs::db eval {SELECT type, time, source, size, perms FROM files WHERE package_sha1 = $pathinfo(package_sha1) AND file_directory = $directory AND file_name = $file;} retval {}
					unset -nocomplain retval(*)
							switch -- $localpathinfo(type) {
								"directory" {
									set retval(type) "directory"
									set retval(childcount) 2
								}
								"file" {
									set retval(type) "file"
									set retval(size) $localpathinfo(size)
									if {[file executable $localpath]} {
										set retval(perms) "x"
									} else {
										set retval(perms) ""
									}
								}
								"link" {
									set retval(type) "symlink"
									set retval(source) [file readlink $localpath]
								}
							}
						} err
					} else {
						set retval(is_remotefile) 1

						set work [split $pathinfo(file) "/"]
						set directory [join [lrange $work 0 end-1] "/"]
						set file [lindex $work end]
						::appfs::db eval {SELECT type, time, source, size, perms FROM files WHERE package_sha1 = $pathinfo(package_sha1) AND file_directory = $directory AND file_name = $file;} retval {}
						unset -nocomplain retval(*)
					}
				}

			}
		}

		if {![info exists retval(type)]} {
			return -code error "No such file or directory"
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		if {$pathinfo(_type) != "files"} {
			return -code error "invalid type"
		}

		set localpath [_localpath $pathinfo(package) $pathinfo(hostname) $pathinfo(file)]

		if {$mode == "create"} {
			file delete -- "${localpath}.APPFS.WHITEOUT"
		if {[file exists $localpath]} {

			return $localpath
		}

		if {$mode == "create"} {
		if {[file exists $localpath]} {
			return $localpath
		}

		set work [split $pathinfo(file) "/"]
		set directory [join [lrange $work 0 end-1] "/"]
		set file [lindex $work end]
		::appfs::db eval {SELECT file_sha1, perms FROM files WHERE package_sha1 = $pathinfo(package_sha1) AND file_name = $file AND file_directory = $directory;} pkgpathinfo {}
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		set dirname [file dirname $filename]

		file mkdir $dirname

		return $filename
	}

	proc prepare_to_create {path} {
		if {[exists $path] != ""} {
			return -code error "File already exists"
		}

		set filename [openpath $path "create"]

		set dirname [file dirname $filename]

		file mkdir $dirname

		return $filename
	}

	proc localpath {path} {
		array set pathinfo [_parsepath $path]

		if {$pathinfo(_type) != "files"} {
			return -code error "invalid type"
		}

		set localpath [_localpath $pathinfo(package) $pathinfo(hostname) $pathinfo(file)]

		return $localpath
	}
}

	proc _delete_files_except_whiteout {path} {
		foreach file [glob -nocomplain -directory $path {{.,}*}] {
			if {[string match "*/.." $file] || [string match "*/." $file]} {
				continue
			}

			if {[file isdirectory $file]} {
				_delete_files_except_whiteout $file
			}

			if {[string match "*.APPFS.WHITEOUT" $file]} {
				continue
			}

			catch {
				file delete -- $file
			}
		}
	}

	proc unlinkpath {path} {
		array set pathattrs [exists $path]

		if {![info exists pathattrs(packaged)]} {
			return -code error "invalid type"
		}

		set localpath $pathattrs(localpath)

		set whiteout 0
		set isdirectory 0
		if {[info exists pathattrs(is_localfile)]} {
			if {[file isdirectory $localpath]} {
				set isdirectory 1
				set whiteout 1
				_delete_files_except_whiteout $localpath
			} else {
				file delete -force -- $localpath
			}
		} elseif {[info exists pathattrs(is_remotefile)]} {
			if {$pathattrs(type) == "directory"} {
				set isdirectory 1
			}

			set whiteout 1
		} else {
			return -code error "Unknown if file is remote or local !?"
		}

		if {$isdirectory} {
			set children [getchildren $path]
			if {$children != [list]} {
				return -code error "Asked to delete non-empty directory"
			}
		}

		if {$whiteout} {
			set whiteoutfile "${localpath}.APPFS.WHITEOUT"
			set whiteoutdir [file dirname $whiteoutfile]
			file mkdir $whiteoutdir
			close [open $whiteoutfile w]
		}
	}
}