feat: add command to resolve a generation ref into a chunk id

Sponsored-by: author

4 files changed, 39 insertions, 0 deletions

diff --git a/obnam.md b/obnam.md
index decb28c..5386dea 100644
--- a/obnam.md
+++ b/obnam.md
@@ -1278,6 +1278,8 @@ when I run obnam backup
 then backup generation is GEN
 when I run obnam list
 then generation list contains <GEN>
+when I run obnam resolve latest
+then generation list contains <GEN>
 when I invoke obnam restore <GEN> rest
 given a manifest of the directory live restored in rest in rest.yaml
 then manifests live.yaml and rest.yaml match
diff --git a/src/bin/obnam.rs b/src/bin/obnam.rs
index 29de2eb..b2d5683 100644
--- a/src/bin/obnam.rs
+++ b/src/bin/obnam.rs
@@ -9,6 +9,7 @@ use obnam::cmd::get_chunk::GetChunk;
 use obnam::cmd::init::Init;
 use obnam::cmd::list::List;
 use obnam::cmd::list_files::ListFiles;
+use obnam::cmd::resolve::Resolve;
 use obnam::cmd::restore::Restore;
 use obnam::cmd::show_config::ShowConfig;
 use obnam::cmd::show_gen::ShowGeneration;
@@ -44,6 +45,7 @@ fn main_program() -> anyhow::Result<()> {
         Command::List(x) => x.run(&config),
         Command::ShowGeneration(x) => x.run(&config),
         Command::ListFiles(x) => x.run(&config),
+        Command::Resolve(x) => x.run(&config),
         Command::Restore(x) => x.run(&config),
         Command::GetChunk(x) => x.run(&config),
         Command::Config(x) => x.run(&config),
@@ -102,6 +104,7 @@ enum Command {
     ListFiles(ListFiles),
     Restore(Restore),
     ShowGeneration(ShowGeneration),
+    Resolve(Resolve),
     GetChunk(GetChunk),
     Config(ShowConfig),
     EncryptChunk(EncryptChunk),
diff --git a/src/cmd/mod.rs b/src/cmd/mod.rs
index 7313a05..502ec5d 100644
--- a/src/cmd/mod.rs
+++ b/src/cmd/mod.rs
@@ -5,6 +5,7 @@ pub mod get_chunk;
 pub mod init;
 pub mod list;
 pub mod list_files;
+pub mod resolve;
 pub mod restore;
 pub mod show_config;
 pub mod show_gen;
diff --git a/src/cmd/resolve.rs b/src/cmd/resolve.rs
new file mode 100644
index 0000000..a175655
--- /dev/null
+++ b/src/cmd/resolve.rs
@@ -0,0 +1,33 @@
+use crate::client::AsyncBackupClient;
+use crate::config::ClientConfig;
+use crate::error::ObnamError;
+use structopt::StructOpt;
+use tokio::runtime::Runtime;
+
+#[derive(Debug, StructOpt)]
+pub struct Resolve {
+    generation: String,
+}
+
+impl Resolve {
+    pub fn run(&self, config: &ClientConfig) -> Result<(), ObnamError> {
+        let rt = Runtime::new()?;
+        rt.block_on(self.run_async(config))
+    }
+
+    async fn run_async(&self, config: &ClientConfig) -> Result<(), ObnamError> {
+        let client = AsyncBackupClient::new(config)?;
+        let generations = client.list_generations().await?;
+
+        match generations.resolve(&self.generation) {
+            Err(err) => {
+                return Err(err.into());
+            }
+            Ok(old_id) => {
+                println!("{}", old_id);
+            }
+        };
+
+        Ok(())
+    }
+}