diff --git a/src/server/actors/repo/branch.rs b/src/server/actors/repo/branch.rs
index 14e06fb..669a0f7 100644
--- a/src/server/actors/repo/branch.rs
+++ b/src/server/actors/repo/branch.rs
@@ -1,9 +1,16 @@
-pub(crate) async fn validate_positions(
-    _config: crate::server::config::RepoConfig,
+use crate::server::forge;
+
+#[tracing::instrument(fields(forge_name = %repo_details.forge.name, repo_name = %repo_details.name))]
+pub async fn validate_positions(
+    repo_details: crate::server::config::RepoDetails,
+    config: crate::server::config::RepoConfig,
     _addr: actix::prelude::Addr<super::RepoActor>,
-    _net: kxio::network::Network,
+    net: kxio::network::Network,
 ) {
-    // TODO: validate repo - next is no more than one commit ahead of main
-    // TODO: validate repo - dev is same as or is ahead of next
+    let _commit_histories = match repo_details.forge.forge_type {
+        crate::server::config::ForgeType::ForgeJo => {
+            forge::forgejo::get_commit_histories(&repo_details, &config, &net)
+        }
+    };
     todo!()
 }
diff --git a/src/server/actors/repo/mod.rs b/src/server/actors/repo/mod.rs
index 0734081..eb8693f 100644
--- a/src/server/actors/repo/mod.rs
+++ b/src/server/actors/repo/mod.rs
@@ -48,9 +48,10 @@ impl Handler<LoadedConfig> for RepoActor {
         let config = msg.0;
         info!(%self.details, %config, "Config loaded");
         self.config.replace(config.clone());
+        let repo_details = self.details.clone();
         let addr = ctx.address();
         let net = self.net.clone();
-        branch::validate_positions(config, addr, net)
+        branch::validate_positions(repo_details, config, addr, net)
             .into_actor(self)
             .wait(ctx);
     }
diff --git a/src/server/forge/forgejo/mod.rs b/src/server/forge/forgejo/mod.rs
index ef68c36..1a57b9e 100644
--- a/src/server/forge/forgejo/mod.rs
+++ b/src/server/forge/forgejo/mod.rs
@@ -1 +1,66 @@
+use kxio::network;
+use terrors::OneOf;
+use tracing::{error, info};
+
+use crate::server::{config::BranchName, forge};
+
+use super::CommitHistories;
+
 pub mod config;
+
+pub async fn get_commit_histories(
+    repo_details: &crate::server::config::RepoDetails,
+    config: &crate::server::config::RepoConfig,
+    net: &kxio::network::Network,
+) -> Result<CommitHistories, OneOf<(network::NetworkError,)>> {
+    let main = (get_commit_history(repo_details, &config.branches().main(), net).await)?;
+    let next = (get_commit_history(repo_details, &config.branches().next(), net).await)?;
+    let dev = (get_commit_history(repo_details, &config.branches().dev(), net).await)?;
+    let histories = CommitHistories { main, next, dev };
+    Ok(histories)
+}
+
+#[tracing::instrument(fields(%branch_name))]
+async fn get_commit_history(
+    repo_details: &crate::server::config::RepoDetails,
+    branch_name: &BranchName,
+    net: &kxio::network::Network,
+) -> Result<Vec<forge::Commit>, OneOf<(network::NetworkError,)>> {
+    let hostname = &repo_details.forge.hostname;
+    let path = &repo_details.repo;
+    let token = &repo_details.forge.token;
+    let url = network::NetUrl::new(format!(
+        "https://{hostname}/api/v1/repos/{path}/commits?sha={branch_name}&stat=false&files=false&token={token}"
+    ));
+
+    info!(%url, "Fetching commits");
+    let request = network::NetRequest::new(
+        network::RequestMethod::Get,
+        url,
+        network::NetRequestHeaders::new(),
+        network::RequestBody::None,
+        network::ResponseType::Json,
+        None,
+        network::NetRequestLogging::Both,
+    );
+    let result = net.get::<Vec<Commit>>(request).await;
+    let response = result.map_err(|e| {
+        error!(?e, "Failed to get commit history");
+        OneOf::new(e)
+    })?;
+    let commits = response
+        .response_body()
+        .unwrap_or_default()
+        .into_iter()
+        .map(|commit| commit.sha)
+        .map(|sha| forge::Commit { sha })
+        .collect();
+
+    Ok(commits)
+}
+
+#[allow(dead_code)]
+#[derive(Debug, Default, serde::Deserialize)]
+struct Commit {
+    sha: String,
+}
diff --git a/src/server/forge/mod.rs b/src/server/forge/mod.rs
index 607ec12..8d35f4c 100644
--- a/src/server/forge/mod.rs
+++ b/src/server/forge/mod.rs
@@ -1 +1,13 @@
 pub mod forgejo;
+
+#[derive(Clone, Debug)]
+pub struct CommitHistories {
+    pub main: Vec<Commit>,
+    pub next: Vec<Commit>,
+    pub dev: Vec<Commit>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Commit {
+    pub sha: String,
+}