hooks: factor out an update-working-tree.sh script

In some cases the working tree needs to be updated outside of
populate-sparsely.sh (which is meant for a post-enter hook), so split
out this task from the main script.

diff --git a/.config/vcsh/hooks-available/populate-sparsely.sh b/.config/vcsh/hooks-available/populate-sparsely.sh
index 937122a..cca8218 100755 (executable)
--- a/.config/vcsh/hooks-available/populate-sparsely.sh
+++ b/.config/vcsh/hooks-available/populate-sparsely.sh
@@ -19,13 +19,8 @@ LOCKPID=$(cat "$LOCKDIR/pid")
 # shellcheck source=/dev/null
 . "$XDG_CONFIG_HOME/vcsh/hooks-available/enable-sparse-checkout.sh"
 
-# Verify if the current branch is valid before updating the working tree.
-# This avoids errors with empty repositories which would only confuse the
-# user.
-if git rev-parse --verify HEAD >/dev/null 2>&1;
-then
-  git read-tree -mu HEAD
-fi
+# shellcheck source=/dev/null
+. "$XDG_CONFIG_HOME/vcsh/hooks-available/update-working-tree.sh"
 
 # Unlock the working tree.
 rm -rf "$LOCKDIR"

diff --git a/.config/vcsh/hooks-available/update-working-tree.sh b/.config/vcsh/hooks-available/update-working-tree.sh
new file mode 100755 (executable)
index 0000000..8d88e8c
--- /dev/null
+++ b/.config/vcsh/hooks-available/update-working-tree.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+# Verify if the current branch is valid before updating the working tree.
+# This avoids errors with empty repositories which would only confuse the
+# user.
+if git rev-parse --verify HEAD >/dev/null 2>&1;
+then
+  git read-tree -mu HEAD
+fi
+