From a7103623af8ffe746633bb4b7538ee499e08d331 Mon Sep 17 00:00:00 2001
From: Andrey Smirnov <Smirnov.Andrey@gmail.com>
Date: Fri, 13 Mar 2015 21:46:32 +0300
Subject: [PATCH] .changes files parsing. #71

---
 deb/changes.go      | 72 +++++++++++++++++++++++++++++++++++++++++++++
 deb/changes_test.go | 67 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 139 insertions(+)
 create mode 100644 deb/changes.go
 create mode 100644 deb/changes_test.go

diff --git a/deb/changes.go b/deb/changes.go
new file mode 100644
index 00000000..913dee9c
--- /dev/null
+++ b/deb/changes.go
@@ -0,0 +1,72 @@
+package deb
+
+import (
+	"fmt"
+	"github.com/smira/aptly/utils"
+	"os"
+)
+
+// Changes is a result of .changes file parsing
+type Changes struct {
+	Changes      string
+	Distribution string
+	Files        PackageFiles
+}
+
+// ParseChangesFile does optional signature verification and parses changes files
+func ParseChangesFile(path string, acceptUnsigned, ignoreSignature bool, verifier utils.Verifier) (*Changes, error) {
+	input, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer input.Close()
+
+	isClearSigned, err := verifier.IsClearSigned(input)
+	if err != nil {
+		return nil, err
+	}
+
+	input.Seek(0, 0)
+
+	if !isClearSigned && !acceptUnsigned {
+		return nil, fmt.Errorf(".changes file is not signed and unsigned processing hasn't been enabled")
+	}
+
+	if isClearSigned && !ignoreSignature {
+		err = verifier.VerifyClearsigned(input)
+		if err != nil {
+			return nil, err
+		}
+		input.Seek(0, 0)
+	}
+
+	var text *os.File
+
+	if isClearSigned {
+		text, err = verifier.ExtractClearsigned(input)
+		if err != nil {
+			return nil, err
+		}
+		defer text.Close()
+	} else {
+		text = input
+	}
+
+	reader := NewControlFileReader(text)
+	stanza, err := reader.ReadStanza()
+	if err != nil {
+		return nil, err
+	}
+
+	result := &Changes{
+		Distribution: stanza["Distribution"],
+		Changes:      stanza["Changes"],
+	}
+
+	result.Files, err = result.Files.ParseSumFields(stanza)
+	if err != nil {
+		return nil, err
+	}
+
+	return result, nil
+}
diff --git a/deb/changes_test.go b/deb/changes_test.go
new file mode 100644
index 00000000..eae5ee18
--- /dev/null
+++ b/deb/changes_test.go
@@ -0,0 +1,67 @@
+package deb
+
+import (
+	. "gopkg.in/check.v1"
+	"os"
+	"path/filepath"
+)
+
+type ChangesSuite struct {
+}
+
+var _ = Suite(&ChangesSuite{})
+
+func (s *ChangesSuite) TestParseChanges(c *C) {
+	dir := c.MkDir()
+	path := filepath.Join(dir, "calamares.changes")
+
+	f, err := os.Create(path)
+	c.Assert(err, IsNil)
+
+	f.WriteString(changesFile)
+	f.Close()
+
+	changes, err := ParseChangesFile(path, true, true, &NullVerifier{})
+	c.Check(err, IsNil)
+
+	c.Check(changes.Distribution, Equals, "sid")
+	c.Check(changes.Files, HasLen, 4)
+	c.Check(changes.Files[0].Filename, Equals, "calamares_0+git20141127.99.dsc")
+	c.Check(changes.Files[0].Checksums.Size, Equals, int64(1106))
+	c.Check(changes.Files[0].Checksums.MD5, Equals, "05fd8f3ffe8f362c5ef9bad2f936a56e")
+	c.Check(changes.Files[0].Checksums.SHA1, Equals, "79f10e955dab6eb25b7f7bae18213f367a3a0396")
+	c.Check(changes.Files[0].Checksums.SHA256, Equals, "35b3280a7b1ffe159a276128cb5c408d687318f60ecbb8ab6dedb2e49c4e82dc")
+}
+
+var changesFile = `Format: 1.8
+Date: Thu, 27 Nov 2014 13:24:53 +0000
+Source: calamares
+Binary: calamares calamares-dbg
+Architecture: source amd64
+Version: 0+git20141127.99
+Distribution: sid
+Urgency: medium
+Maintainer: Rohan Garg <rohan@kde.org>
+Changed-By: Rohan <rohan@kde.org>
+Description:
+ calamares  - distribution-independent installer framework
+ calamares-dbg - distribution-independent installer framework -- debug symbols
+Changes:
+ calamares (0+git20141127.99) sid; urgency=medium
+ .
+   * Update from git
+Checksums-Sha1:
+ 79f10e955dab6eb25b7f7bae18213f367a3a0396 1106 calamares_0+git20141127.99.dsc
+ 294c28e2c8e34e72ca9ee0d9da5c14f3bf4188db 2694800 calamares_0+git20141127.99.tar.xz
+ d6c26c04b5407c7511f61cb3e3de60c4a1d6c4ff 1698924 calamares_0+git20141127.99_amd64.deb
+ a3da632d193007b0d4a1aff73159fde1b532d7a8 12835902 calamares-dbg_0+git20141127.99_amd64.deb
+Checksums-Sha256:
+ 35b3280a7b1ffe159a276128cb5c408d687318f60ecbb8ab6dedb2e49c4e82dc 1106 calamares_0+git20141127.99.dsc
+ 5576b9caaf814564830f95561227e4f04ee87b31da22c1371aab155cbf7ce395 2694800 calamares_0+git20141127.99.tar.xz
+ 2e6e2f232ed7ffe52369928ebdf5436d90feb37840286ffba79e87d57a43a2e9 1698924 calamares_0+git20141127.99_amd64.deb
+ 8dd926080ed7bad2e2439e37e49ce12d5f1357c5041b7da4d860a1041f878a8a 12835902 calamares-dbg_0+git20141127.99_amd64.deb
+Files:
+ 05fd8f3ffe8f362c5ef9bad2f936a56e 1106 devel optional calamares_0+git20141127.99.dsc
+ 097e55c81abd8e5f30bb2eed90c2c1e9 2694800 devel optional calamares_0+git20141127.99.tar.xz
+ 827fb3b12534241e119815d331e8197b 1698924 devel optional calamares_0+git20141127.99_amd64.deb
+ e6f8ce70f564d1f68cb57758b15b13e3 12835902 debug optional calamares-dbg_0+git20141127.99_amd64.deb`