Respect author-date for setting up completely static commmit graphs

This updates to a yet-to-be-released version of `gix` to be able to
leverage full local-time support thanks to the usage of `jiff`.

This means we can now rely on the local `now()` that `gix` signatures
come with, which naturally respect environment variables that help
to make commits statically known.

For the running Tauri application this won't have an effect as it won't
inherit environment variables, but the CLI will be different in that regard.

Cargo.toml

@@ -34,7 +34,7 @@ resolver = "2"
 
 [workspace.dependencies]
 # Add the `tracing` or `tracing-detail` features to see more of gitoxide in the logs. Useful to see which programs it invokes.
-gix = { version = "0.64", default-features = false, features = [] }
+gix = { git = "https://github.com/Byron/gitoxide", rev = "1d37bf6a773d56eea9003aa626ced413e8e0eaa3", default-features = false, features = [] }
 git2 = { version = "0.18.3", features = [
     "vendored-openssl",
     "vendored-libgit2",

crates/gitbutler-branch-actions/tests/fixtures/for-listing.sh

@@ -2,13 +2,39 @@
 set -eu -o pipefail
 CLI=${1:?The first argument is the GitButler CLI}
 
+function tick () {
+  if test -z "${tick+set}"; then
+    tick=1675176957
+  else
+    tick=$(($tick + 60))
+  fi
+  GIT_COMMITTER_DATE="$tick +0100"
+  GIT_AUTHOR_DATE="$tick +0100"
+  export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
+}
+tick
+
+
 git init remote
 (cd remote
   echo first > file
   git add . && git commit -m "init"
 )
 
-export GITBUTLER_CLI_DATA_DIR=./git/gitbutler/app-data
+git clone remote single-branch-no-vbranch
+
+git clone remote single-branch-no-vbranch-one-commit
+(cd single-branch-no-vbranch-one-commit
+  echo change >> file && git add . && git commit -m "local change"
+)
+
+git clone remote single-branch-no-vbranch-multi-remote
+(cd single-branch-no-vbranch-multi-remote
+  git remote add other-origin ../remote
+  git fetch other-origin
+)
+
+export GITBUTLER_CLI_DATA_DIR=./user/gitbutler/app-data
 git clone remote one-vbranch-on-integration
 (cd one-vbranch-on-integration
   $CLI project add --switch-to-integration "$(git rev-parse --symbolic-full-name @{u})"

crates/gitbutler-repo/src/repository.rs

@@ -447,17 +447,18 @@ impl RepoActionsExt for CommandContext {
     fn signatures(&self) -> Result<(git2::Signature, git2::Signature)> {
         let repo = gix::open(self.repository().path())?;
 
-        let default_actor = gix::actor::SignatureRef {
-            name: GITBUTLER_INTEGRATION_COMMIT_AUTHOR_NAME.into(),
-            email: GITBUTLER_INTEGRATION_COMMIT_AUTHOR_EMAIL.into(),
-            time: Default::default(),
-        };
-        let author = repo.author().transpose()?.unwrap_or(default_actor);
+        let author = repo
+            .author()
+            .transpose()?
+            .unwrap_or_else(|| default_actor_with_commit_time("GIT_AUTHOR_DATE"));
+
         let config: Config = self.repository().into();
         let committer = if config.user_real_comitter()? {
-            repo.committer().transpose()?.unwrap_or(default_actor)
+            repo.committer()
+                .transpose()?
+                .unwrap_or_else(|| default_actor_with_commit_time("GIT_COMMITTER_DATE"))
         } else {
-            default_actor
+            default_actor_with_commit_time("GIT_COMMITTER_DATE")
         };
 
         Ok((
@@ -467,10 +468,28 @@ impl RepoActionsExt for CommandContext {
     }
 }
 
+fn default_actor_with_commit_time(
+    overriding_variable_name: &str,
+) -> gix::actor::SignatureRef<'static> {
+    gix::actor::SignatureRef {
+        name: GITBUTLER_INTEGRATION_COMMIT_AUTHOR_NAME.into(),
+        email: GITBUTLER_INTEGRATION_COMMIT_AUTHOR_EMAIL.into(),
+        time: std::env::var(overriding_variable_name)
+            .ok()
+            .and_then(|time| gix::date::parse(&time, Some(std::time::SystemTime::now())).ok())
+            .unwrap_or_else(|| gix::date::Time::now_local_or_utc()),
+    }
+}
+
+/// Convert `actor` to a `git2` representation or fail if that's not possible.
+/// Note that the current time as provided by `gix` is also use as it
+/// respects the `GIT_AUTHOR|COMMITTER_DATE` environment variables.
 fn actor_to_git2_signature(
     actor: gix::actor::SignatureRef<'_>,
 ) -> Result<git2::Signature<'static>> {
-    Ok(git2::Signature::now(
+    let offset_in_minutes = actor.time.offset / 60;
+    let time = git2::Time::new(actor.time.seconds, offset_in_minutes);
+    Ok(git2::Signature::new(
         actor
             .name
             .to_str()
@@ -479,6 +498,7 @@ fn actor_to_git2_signature(
             .email
             .to_str()
             .with_context(|| format!("Could not process actor email: {}", actor.email))?,
+        &time,
     )?)
 }