fix: follow a link anywhere under the store base

src/commands/link.rs

@@ -9,7 +9,7 @@ use std::path::{Path, PathBuf};
 
 use anyhow::{Context, Result, anyhow, bail};
 
-use self::store::{Leads, Repo, ignored, leads, resolve, symlink_metadata_opt, tracked};
+use self::store::{Leads, Repo, held, ignored, leads, resolve, symlink_metadata_opt, tracked};
 use crate::cli::link as cli;
 use crate::ctx::Ctx;
 use crate::fsops::suffixed;
@@ -104,7 +104,6 @@ pub fn restore(ctx: &Ctx, args: &cli::Restore) -> Result<()> {
 fn restore_one(ctx: &Ctx, repo: &Repo, path: &Path, report: &Report) -> Result<()> {
     let src = resolve(path)?;
     let rel = repo.relative(&src)?;
-    let stored = repo.store.join(&rel);
 
     let Some(meta) = symlink_metadata_opt(&src)? else {
         bail!("{} does not exist", rel.display());
@@ -116,14 +115,16 @@ fn restore_one(ctx: &Ctx, repo: &Repo, path: &Path, report: &Report) -> Result<(
         );
     }
 
+    // followed to wherever under the base it points, so a checkout that moved
+    // or a store laid out by an older ahab can still take its files back
     let dest = read_link(&src)?;
-    if dest != stored {
+    let Some(stored) = held(repo, &src, &dest) else {
         bail!(
-            "{} points at {}, which is not where the store keeps it",
+            "{} points at {}, which is not in the store",
             rel.display(),
             dest.display()
         );
-    }
+    };
     if symlink_metadata_opt(&stored)?.is_none() {
         bail!("{} is missing from the store", rel.display());
     }