git-commit: introduce git-commit crate

Porting the commit code that is found in heartwood[0]. It represents a
parsed git commit object -- sans the id for the commit itself.

[0]: https://github.com/radicle-dev/heartwood/blob/16b22d9178fa6a1aaf2ecb01ec97e067399c5286/radicle/src/git.rs#L392-L575

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett

git-commit/t/src/commit.rs

@@ -0,0 +1,107 @@
+use std::str::FromStr as _;
+
+use git_commit::Commit;
+
+const UNSIGNED: &str = "\
+tree c66cc435f83ed0fba90ed4500e9b4b96e9bd001b
+parent af06ad645133f580a87895353508053c5de60716
+author Alexis Sellier <alexis@radicle.xyz> 1664467633 +0200
+committer Alexis Sellier <alexis@radicle.xyz> 1664786099 -0200
+
+Add SSH functionality with new `radicle-ssh`
+
+We borrow code from `thrussh`, refactored to be runtime-less.
+";
+
+const SSH_SIGNATURE: &str = "\
+-----BEGIN SSH SIGNATURE-----
+U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAgvjrQogRxxLjzzWns8+mKJAGzEX
+4fm2ALoN7pyvD2ttQAAAADZ2l0AAAAAAAAAAZzaGE1MTIAAABTAAAAC3NzaC1lZDI1NTE5
+AAAAQIQvhIewOgGfnXLgR5Qe1ZEr2vjekYXTdOfNWICi6ZiosgfZnIqV0enCPC4arVqQg+
+GPp0HqxaB911OnSAr6bwU=
+-----END SSH SIGNATURE-----";
+
+const PGP_SIGNATURE: &str = "\
+-----BEGIN PGP SIGNATURE-----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+=6dw2
+-----END PGP SIGNATURE-----";
+
+const SIGNED: &str = "\
+tree c66cc435f83ed0fba90ed4500e9b4b96e9bd001b
+parent af06ad645133f580a87895353508053c5de60716
+author Alexis Sellier <alexis@radicle.xyz> 1664467633 +0200
+committer Alexis Sellier <alexis@radicle.xyz> 1664786099 -0200
+other e6fe3c97619deb8ab4198620f9a7eb79d98363dd
+gpgsig -----BEGIN SSH SIGNATURE-----
+ U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAgvjrQogRxxLjzzWns8+mKJAGzEX
+ 4fm2ALoN7pyvD2ttQAAAADZ2l0AAAAAAAAAAZzaGE1MTIAAABTAAAAC3NzaC1lZDI1NTE5
+ AAAAQIQvhIewOgGfnXLgR5Qe1ZEr2vjekYXTdOfNWICi6ZiosgfZnIqV0enCPC4arVqQg+
+ GPp0HqxaB911OnSAr6bwU=
+ -----END SSH SIGNATURE-----
+gpgsig -----BEGIN PGP SIGNATURE-----
+ iQIzBAABCAAdFiEEHe7BWIo9taTY6TIiJVL7b2QGbLcFAmNcDhsACgkQJVL7b2QG
+ bLcc9Q//RgKf5N4enta9AuszGJZvdFhMPfIDUdw+WAZA6Z8zDPb/aAXZrPP/KIOM
+ zmX08FTqjP9B9YeWrEcFuAtxsRNqbDKrfpko9Y6bTsdrAJg3WIypBb9F8YDKJ6BO
+ CORJJqWOsLW129jW+mJDhcE0YTvPlcMiMI2qjVXKhU6Ag11W8IRZyTb9tvEaDjBR
+ YUnkPvgubv61K9BeUKexE2MakPBldaQtl0MF1Dk7/zo5btLd+KP0SOUKEhuMEu5b
+ LATHHdiYjt/2Xz7q8EcrFxXUaipxZe89dfTdi2ooJQw3ZDqjDHsGTHpDeBuzuSaJ
+ 9fKVRwFz/78onfHPhmU4wfUhh+Fcl90p5/T+4dt2K6cr+7rq078e+aJYxkX2d0MG
+ PG0xGP0RN4g+X92K1kGuzoe4870xAnRTNh5nUB+X9snO8tVqQZTb0M2yI+sTsKrv
+ w/f+uiqL6e9DgIxlO5dgiNHCVoCs1QJ900jUGisrlzS4+n6GzMsG6s3c01X4yY9G
+ Ou/kGkMsn7tqejqC9RufygcchCFZqYwaHQwPkiYhfYGMarMpoCFvll0h8tSparpS
+ nnpAQXVdu8m3v1YdPUuTg5ksxSOe9HCIlVXGFhxy3iqCVRn+51FRnUI63rMTOm9/
+ LBqzvji02lDUPGqPgXfcCS0ty8FM2flBIXnwb8TDzCaPYhf53+U=
+ =6dw2
+ -----END PGP SIGNATURE-----
+
+Add SSH functionality with new `radicle-ssh`
+
+We borrow code from `thrussh`, refactored to be runtime-less.
+";
+
+#[test]
+fn test_push_header() {
+    let mut commit = Commit::from_str(UNSIGNED).unwrap();
+
+    commit.push_header("other", "e6fe3c97619deb8ab4198620f9a7eb79d98363dd");
+    commit.push_header("gpgsig", SSH_SIGNATURE);
+    commit.push_header("gpgsig", PGP_SIGNATURE);
+
+    assert_eq!(commit.to_string(), SIGNED);
+}
+
+#[test]
+fn test_get_header() {
+    let commit = Commit::from_str(SIGNED).unwrap();
+
+    assert_eq!(
+        commit
+            .signatures()
+            .map(|sig| sig.to_string())
+            .collect::<Vec<_>>(),
+        vec![SSH_SIGNATURE.to_owned(), PGP_SIGNATURE.to_owned()]
+    );
+    assert_eq!(
+        commit.values("other").collect::<Vec<_>>(),
+        vec![String::from("e6fe3c97619deb8ab4198620f9a7eb79d98363dd")],
+    );
+    assert!(commit.values("unknown").next().is_none());
+}
+
+#[test]
+fn test_conversion() {
+    assert_eq!(Commit::from_str(SIGNED).unwrap().to_string(), SIGNED);
+    assert_eq!(Commit::from_str(UNSIGNED).unwrap().to_string(), UNSIGNED);
+}

git-commit/t/src/integration.rs

@@ -0,0 +1,28 @@
+use std::io;
+
+use git_commit::Commit;
+use test_helpers::tempdir::WithTmpDir;
+
+#[test]
+fn valid_commits() {
+    let radicle_git = format!(
+        "file://{}",
+        git2::Repository::discover(".").unwrap().path().display()
+    );
+    let repo = WithTmpDir::new(|path| {
+        let repo = git2::Repository::clone(&radicle_git, path)
+            .map_err(|err| io::Error::new(io::ErrorKind::Other, err))?;
+        Ok::<_, io::Error>(repo)
+    })
+    .unwrap();
+
+    let mut walk = repo.revwalk().unwrap();
+    walk.push_head().unwrap();
+
+    // take the first 20 commits and make sure we can parse them
+    for oid in walk.take(20) {
+        let oid = oid.unwrap();
+        let commit = Commit::read(&repo, oid);
+        assert!(commit.is_ok(), "Oid: {}, Error: {:?}", oid, commit)
+    }
+}

git-commit/t/src/lib.rs

@@ -0,0 +1,5 @@
+#[cfg(test)]
+mod commit;
+
+#[cfg(test)]
+mod integration;