rewrite extract_curl_version again

Author: lolbinarycat

src/bootstrap/src/core/download.rs

@@ -21,23 +21,20 @@ fn try_run(config: &Config, cmd: &mut Command) -> Result<(), ()> {
     config.try_run(cmd)
 }
 
-fn extract_curl_version(out: &[u8]) -> (u16, u16) {
-    let out = &out[5..];
-    let Some(i) = out.iter().position(|&x| x == b' ') else { return (0, 0) };
-    let out = &out[..i];
-    let Some(k) = out.iter().rev().position(|&x| x == b'.') else { return (0, 0) };
-    let out = &out[..out.len() - k - 1];
-    let Ok(s) = std::str::from_utf8(out) else { return (0, 0) };
-    let parts = s.split('.').collect::<Vec<_>>();
-    let [s_major, s_minor] = &parts[..] else { return (0, 0) };
-    let (Ok(major), Ok(minor)) = (s_major.parse(), s_minor.parse()) else { return (0, 0) };
-    (major, minor)
+fn extract_curl_version(out: &[u8]) -> semver::Version {
+    let out = String::from_utf8_lossy(out);
+    // The output should look like this: "curl <major>.<minor>.<patch> ..."
+    out.lines()
+        .next()
+        .and_then(|line| line.split(" ").nth(1))
+        .and_then(|version| semver::Version::parse(version).ok())
+        .unwrap_or(semver::Version::new(1, 0, 0))
 }
 
-fn curl_version() -> (u16, u16) {
+fn curl_version() -> semver::Version {
     let mut curl = Command::new("curl");
     curl.arg("-V");
-    let Ok(out) = curl.output() else { return (0, 0) };
+    let Ok(out) = curl.output() else { return semver::Version::new(1, 0, 0) };
     let out = out.stdout;
     extract_curl_version(&out)
 }
@@ -253,7 +250,7 @@ impl Config {
             curl.arg("--progress-bar");
         }
         // --retry-all-errors was added in 7.71.0, don't use it if curl is old.
-        if curl_version() > (7, 70) {
+        if curl_version() >= semver::Version::new(7, 71, 0) {
             curl.arg("--retry-all-errors");
         }
         curl.arg(url);