init

os_release.v

@@ -0,0 +1,69 @@
+module os_release
+
+import os
+import strings
+
+// options contains list of default os-release, initrd-release, extension-release options.
+pub const options = ['NAME', 'ID', 'ID_LIKE', 'PRETTY_NAME', 'CPE_NAME', 'VARIANT', 'VARIANT_ID',
+	'VERSION', 'VERSION_ID', 'VERSION_CODENAME', 'BUILD_ID', 'IMAGE_ID', 'IMAGE_VERSION',
+	'RELEASE_TYPE', 'HOME_URL', 'DOCUMENTATION_URL', 'SUPPORT_URL', 'BUG_REPORT_URL',
+	'PRIVACY_POLICY_URL', 'SUPPORT_END', 'LOGO', 'ANSI_COLOR', 'VENDOR_NAME', 'VENDOR_URL',
+	'EXPERIMENT', 'EXPERIMENT_URL', 'DEFAULT_HOSTNAME', 'ARCHITECTURE', 'SYSEXT_LEVEL',
+	'CONFEXT_LEVEL', 'SYSEXT_SCOPE', 'CONFEXT_SCOPE', 'PORTABLE_PREFIXES']!
+
+// os_release reads `/etc/os-release` and `/usr/lib/os-release` files and returns parsed
+// os-release data. Empty map will be returned if files does not exits or reading issues
+// caused. The resulting map will contain only options that is present in actual os-release
+// file.
+pub fn os_release() map[string]string {
+	mut ret := map[string]string{}
+	for file in ['/etc/os-release', '/usr/lib/os-release'] {
+		ret = parse_file(file) or { continue }
+	}
+	return ret
+}
+
+// parse_file reads the `file` and returns map of os-release key-value pairs.
+pub fn parse_file(file string) !map[string]string {
+	return parse(os.read_file(file)!)
+}
+
+// parse parses the `content` string and returns map of os-release key-value pairs.
+// Example:
+// ```
+// assert os_release.parse('PRETTY_NAME="Debian GNU/Linux 13 (trixie)"') == {'PRETTY_NAME': 'Debian GNU/Linux 13 (trixie)'}
+// ```
+pub fn parse(content string) map[string]string {
+	mut ret := map[string]string{}
+	for raw_line in content.split_into_lines() {
+		line := raw_line.trim_space()
+		if line.is_blank() || line.starts_with('#') {
+			continue
+		}
+		key, value := line.split_once('=') or { continue }
+		if key == '' {
+			continue
+		}
+		ret = {
+			...ret
+			key: unescape(value)
+		}
+	}
+	return ret
+}
+
+fn unescape(s string) string {
+	mut ret := strings.new_builder(128)
+	for i := 0; i < s.len; i++ {
+		if (i == 0 || i == s.len - 1) && s[i] in [`"`, `'`] {
+			continue // trim leading and trailing quotes
+		}
+		if s[i] == `\\` && i + 1 < s.len {
+			ret.write_byte(s[i + 1])
+			i++
+		} else {
+			ret.write_byte(s[i])
+		}
+	}
+	return ret.str()
+}