initial support for large objects

This has gone through a lot of iterations on my branch, and I'm quite
happy with the parts of the API that exist now. Test coverage can still
be better, and will get better in the following commits.

The API is not yet finished: I want to add Options arguments to
Object.Upload(), Object.Copy(), Object.Move() and Object.Delete() that
specify how each of these operations affect existing segments (and,
later, also existing symlinks). For Upload(), uploading in segments
shall become as easy as flipping a single switch.

1 files changed, 87 insertions, 0 deletions

diff --git a/util/gocovcat.go b/util/gocovcat.go
new file mode 100755
index 0000000..bb03f87
--- /dev/null
+++ b/util/gocovcat.go
@@ -0,0 +1,87 @@
+///usr/bin/env go run "$0" "$@"; exit $?
+
+// Copyright 2017 Luke Shumaker <lukeshu@parabola.nu>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+// Command gocovcat combines multiple go cover runs, and prints the
+// result on stdout.
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+func handleErr(err error) {
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		os.Exit(1)
+	}
+}
+
+func main() {
+	modeBool := false
+	blocks := map[string]int{}
+	for _, filename := range os.Args[1:] {
+		file, err := os.Open(filename)
+		handleErr(err)
+		buf := bufio.NewScanner(file)
+		for buf.Scan() {
+			line := buf.Text()
+
+			if strings.HasPrefix(line, "mode: ") {
+				m := strings.TrimPrefix(line, "mode: ")
+				switch m {
+				case "set":
+					modeBool = true
+				case "count", "atomic":
+					// do nothing
+				default:
+					fmt.Fprintf(os.Stderr, "Unrecognized mode: %s\n", m)
+					os.Exit(1)
+				}
+			} else {
+				sp := strings.LastIndexByte(line, ' ')
+				block := line[:sp]
+				cntStr := line[sp+1:]
+				cnt, err := strconv.Atoi(cntStr)
+				handleErr(err)
+				blocks[block] += cnt
+			}
+		}
+		handleErr(buf.Err())
+	}
+	keys := make([]string, 0, len(blocks))
+	for key := range blocks {
+		keys = append(keys, key)
+	}
+	sort.Strings(keys)
+	modeStr := "count"
+	if modeBool {
+		modeStr = "set"
+	}
+	fmt.Printf("mode: %s\n", modeStr)
+	for _, block := range keys {
+		cnt := blocks[block]
+		if modeBool && cnt > 1 {
+			cnt = 1
+		}
+		fmt.Printf("%s %d\n", block, cnt)
+	}
+}