add apk/alpine support (#98)

test/integration/fixture_pkg_coverage_test.go

@@ -141,6 +141,15 @@ var cases = []struct {
 			"unicorn":              "4.8.3",
 		},
 	},
+	{
+
+		name:    "find apkdb packages",
+		pkgType: pkg.ApkPkg,
+		pkgInfo: map[string]string{
+			"musl-utils": "1.1.24-r2",
+			"libc-utils": "0.7.2-r0",
+		},
+	},
 	{
 		name:        "find golang modules",
 		pkgType:     pkg.GoModulePkg,

test/integration/test-fixtures/image-pkg-coverage/lib/apk/db/installed

@@ -0,0 +1,49 @@
+C:Q1p78yvTLG094tHE1+dToJGbmYzQE=
+P:libc-utils
+V:0.7.2-r0
+A:x86_64
+S:1175
+I:4096
+T:Meta package to pull in correct libc
+U:http://alpinelinux.org
+L:BSD
+o:libc-dev
+m:Natanael Copa <ncopa@alpinelinux.org>
+t:1575749004
+c:97b1c2842faa3bfa30f5811ffbf16d5ff9f1a479
+D:musl-utils
+
+C:Q1bTtF5526tETKfL+lnigzIDvm+2o=
+P:musl-utils
+V:1.1.24-r2
+A:x86_64
+S:37944
+I:151552
+T:the musl c library (libc) implementation
+U:https://musl.libc.org/
+L:MIT BSD GPL2+
+o:musl
+m:Timo Teräs <timo.teras@iki.fi>
+t:1584790550
+c:4024cc3b29ad4c65544ad068b8f59172b5494306
+D:scanelf so:libc.musl-x86_64.so.1
+p:cmd:getconf cmd:getent cmd:iconv cmd:ldconfig cmd:ldd
+r:libiconv
+F:sbin
+R:ldconfig
+a:0:0:755
+Z:Q1Kja2+POZKxEkUOZqwSjC6kmaED4=
+F:usr
+F:usr/bin
+R:iconv
+a:0:0:755
+Z:Q1CVmFbdY+Hv6/jAHl1gec2Kbx1EY=
+R:ldd
+a:0:0:755
+Z:Q1yFAhGggmL7ERgbIA7KQxyTzf3ks=
+R:getconf
+a:0:0:755
+Z:Q1dAdYK8M/INibRQF5B3Rw7cmNDDA=
+R:getent
+a:0:0:755
+Z:Q1eR2Dz/WylabgbWMTkd2+hGmEya4=