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use anyhow::Result; #[derive(Debug, PartialEq)] pub struct Linux { pub distro: String, pub version: Option<String>, pub version_name: Option<String>, } impl Linux { #[cfg(target_os = "linux")] pub fn detect() -> Result<Linux> { let file = std::fs::read_to_string("/etc/os-release")?; parse(&file) } #[cfg(not(target_os = "linux"))] pub fn detect() -> Result<Linux> { unreachable!() } } impl ToString for Linux { fn to_string(&self) -> String { if let Some(version) = &self.version { format!("{} {}", self.distro, version) } else { self.distro.to_string() } } } #[cfg(target_os = "linux")] fn parse(file: &str) -> Result<Linux> { use anyhow::Error; let mut distro = None; let mut version = None; let mut version_name = None; for line in file.lines() { if let Some(remaining) = line.strip_prefix("ID=") { distro = Some(parse_value(remaining)?); } else if let Some(remaining) = line.strip_prefix("VERSION_") { if let Some(remaining) = remaining.strip_prefix("ID=") { version = Some(parse_value(remaining)?); } else if let Some(remaining) = remaining.strip_prefix("CODENAME=") { version_name = Some(parse_value(remaining)?); } } } let distro = distro.ok_or_else(|| Error::msg("Mandatory ID= field is missing"))?; Ok(Linux { distro, version, version_name, }) } #[cfg(target_os = "linux")] fn parse_value(mut value: &str) -> Result<String> { if value.starts_with('"') && value.ends_with('"') && value.len() >= 2 { value = &value[1..value.len() - 1]; } Ok(value.to_string()) } #[cfg(test)] mod tests { #[cfg(target_os = "linux")] use super::*; #[test] #[cfg(target_os = "linux")] fn detect_debian() { let os_release = parse( r#" NAME="Debian GNU/Linux" VERSION_ID="10" VERSION="10 (buster)" VERSION_CODENAME=buster ID=debian HOME_URL="https://www.debian.org/" SUPPORT_URL="https://www.debian.org/support" BUG_REPORT_URL="https://bugs.debian.org/" "#, ) .unwrap(); assert_eq!( Linux { distro: "debian".to_string(), version: Some("10".to_string()), version_name: Some("buster".to_string()), }, os_release ); } #[test] #[cfg(target_os = "linux")] fn detect_archlinux() { let os_release = parse( r#" NAME="Arch Linux" PRETTY_NAME="Arch Linux" ID=arch BUILD_ID=rolling ANSI_COLOR="0;36" HOME_URL="https://www.archlinux.org/" DOCUMENTATION_URL="https://wiki.archlinux.org/" SUPPORT_URL="https://bbs.archlinux.org/" BUG_REPORT_URL="https://bugs.archlinux.org/" LOGO=archlinux "#, ) .unwrap(); assert_eq!( Linux { distro: "arch".to_string(), version: None, version_name: None, }, os_release ); } #[test] #[cfg(target_os = "linux")] fn detect_alpine() { let os_release = parse( r#" NAME="Alpine Linux" ID=alpine VERSION_ID=3.11.5 PRETTY_NAME="Alpine Linux v3.11" HOME_URL="https://alpinelinux.org/" BUG_REPORT_URL="https://bugs.alpinelinux.org/" "#, ) .unwrap(); assert_eq!( Linux { distro: "alpine".to_string(), version: Some("3.11.5".to_string()), version_name: None, }, os_release ); } #[test] #[cfg(target_os = "linux")] fn detect_ubuntu() { let os_release = parse( r#" NAME="Ubuntu" VERSION="18.04.4 LTS (Bionic Beaver)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 18.04.4 LTS" VERSION_ID="18.04" HOME_URL="https://www.ubuntu.com/" SUPPORT_URL="https://help.ubuntu.com/" BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/" PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy" VERSION_CODENAME=bionic UBUNTU_CODENAME=bionic "#, ) .unwrap(); assert_eq!( Linux { distro: "ubuntu".to_string(), version: Some("18.04".to_string()), version_name: Some("bionic".to_string()), }, os_release ); } #[test] #[cfg(target_os = "linux")] fn detect_centos() { let os_release = parse( r#" NAME="CentOS Linux" VERSION="8 (Core)" ID="centos" ID_LIKE="rhel fedora" VERSION_ID="8" PLATFORM_ID="platform:el8" PRETTY_NAME="CentOS Linux 8 (Core)" ANSI_COLOR="0;31" CPE_NAME="cpe:/o:centos:centos:8" HOME_URL="https://www.centos.org/" BUG_REPORT_URL="https://bugs.centos.org/" CENTOS_MANTISBT_PROJECT="CentOS-8" CENTOS_MANTISBT_PROJECT_VERSION="8" REDHAT_SUPPORT_PRODUCT="centos" REDHAT_SUPPORT_PRODUCT_VERSION="8" "#, ) .unwrap(); assert_eq!( Linux { distro: "centos".to_string(), version: Some("8".to_string()), version_name: None, }, os_release ); } }