First basic index file verification

README.md

@@ -8,6 +8,14 @@ The CLI uses various crates, please see _'Development Status'_ for details.
 
 ## Development Status
 
+* **gitoxide**
+  * please note that all functionality comes from the `gitoxide-core` library, which mirrors these capabilities
+    and itself relies on all `git-*` crates.
+  * repository
+    * [x] init
+  * plumbing
+    * [x] pack verify
+    * [x] pack index verify including each object sha1
 * **git-repository**
   * [x] initialize
   * [ ] read and write all data types

gitoxide-core/src/lib.rs

@@ -1,13 +1,32 @@
-use anyhow::{Context, Result};
+use anyhow::{anyhow, Context, Result};
 use std::{io, path::Path};
 
 pub fn init() -> Result<()> {
     git_repository::init::repository().with_context(|| "Repository initialization failed")
 }
 
 pub fn verify_pack_or_pack_index(path: impl AsRef<Path>, mut out: impl io::Write) -> Result<()> {
-    let pack = git_odb::pack::File::at(path).with_context(|| "Could not open pack file")?;
-    pack.verify_checksum().with_context(|| "Failed")?;
+    let path = path.as_ref();
+    let ext = path.extension()
+        .and_then(|ext| ext.to_str())
+        .ok_or_else(|| anyhow!("Cannot determine file type on path without extension '{}', expecting default extensions 'idx' and 'pack'", path.display()))?;
+    match ext {
+        "pack" => {
+            let pack = git_odb::pack::File::at(path).with_context(|| "Could not open pack file")?;
+            pack.verify_checksum()?;
+        }
+        "idx" => {
+            let idx = git_odb::pack::index::File::at(path)
+                .with_context(|| "Could not open pack index file")?;
+            idx.verify_checksum_of_index()?;
+        }
+        ext => {
+            return Err(anyhow!(
+                "Unknown extension {:?}, expecting 'idx' or 'pack'",
+                ext
+            ))
+        }
+    }
     writeln!(out, "OK")?;
     Ok(())
 }

tests/snapshots/plumbing-verify-pack-index-success

@@ -0,0 +1 @@
+OK

tests/stateless-journey.sh

@@ -52,6 +52,13 @@ title "CLI"
         expect_run $SUCCESSFULLY "$exe" plumbing verify-pack "$PACK_FILE"
       }
     )
+    (with "a valid pack file"
+      PACK_INDEX_FILE="$fixtures/packs/pack-c0438c19fb16422b6bbcce24387b3264416d485b.idx"
+      it "verifies the pack index successfully and with desired output" && {
+        WITH_SNAPSHOT="$snapshot/plumbing-verify-pack-index-success" \
+        expect_run $SUCCESSFULLY "$exe" plumbing verify-pack "$PACK_INDEX_FILE"
+      }
+    )
   )
 )