acid: Update check_source

Script is renamed to 'cyche-source' and updated to account for a couple
of potential edge-cases during a git update.

Signed-off-by: Malfurious <m@lfurio.us>

1 files changed, 21 insertions, 8 deletions

diff --git a/acid/check_source b/acid/cyche-source
index b86e32d..dd290ac 100755
--- a/acid/check_source
+++ b/acid/cyche-source
@@ -1,23 +1,27 @@
 #!/bin/bash
 
-# check_source <name> <url> <refspec>
+# cyche-source <name> <url> <ref-pattern>
 #
 # Check a git source for new updates.  A local cache repository is cloned if
-# <name> doesn't exist.  If updates are found, we attempt to checkout the
-# newest version according to <refspec> (see git-for-each-ref(1)).
+# <name> doesn't exist.  If updates are found, we attempt to checkout the newest
+# version according to <ref-pattern> (see <pattern> from git-for-each-ref(1)).
 #
-# The new (or current) git commit hash is printed to stdout.  If the file tree
-# is updated, this file exits non-zero.
+# The new (or current, if no update occurred) object hash is printed to stdout.
+# This may be a commit hash.  However, if <ref-pattern> matches an annotated tag,
+# then the hash names the tag object.  The caller should cache this hash value
+# upon successful deployment.
+#
+# If the file tree is updated, this file exits non-zero.
 
 gethash() {
     git for-each-ref \
         --count=1 \
         --format='%(objectname)' \
         --sort='-creatordate' \
-        "$1" #ref
+        "$1" # pattern
 }
 
-cd '/git'
+cd '/services'
 
 if ! [ -d "$1" ]; then
     git clone "$2" "$1" >&2
@@ -27,13 +31,22 @@ fi
 
 cd "$1"
 
+git remote set-url origin "$2" >&2 # pick up url changes
 git fetch --all --prune >&2
+
 prev=$(cat '.git/previous_hash')
 next=$(gethash "$3")
+
+if [ -z "$next" ]; then
+    # no matching refs
+    next="$prev"
+fi
+
 echo "$next"
 
 if [ "$prev" != "$next" ]; then
-    git submodule deinit --all -f >/dev/null 2>&1
+    # update file tree
+    git submodule deinit --all --force >/dev/null 2>&1
     git reset . >/dev/null 2>&1
     git checkout . >/dev/null 2>&1
     git clean -xffd >/dev/null 2>&1