From: Richard Hartmann <RichiH@users.noreply.github.com>
Date: Sat, 8 Feb 2014 15:30:38 +0000 (+0100)
Subject: Merge pull request #89 from alerque/master
X-Git-Url: https://git.madduck.net/code/vcsh.git/commitdiff_plain/30e3b0e741f20d73e24978b4722dd58e7b3ef741?hp=890dbdede9545f927385bfd798f34831df3fc537

Merge pull request #89 from alerque/master

Add hooks to allow fancy merge handling
---

diff --git a/doc/hooks b/doc/hooks
index 54ff795..282ee86 100644
--- a/doc/hooks
+++ b/doc/hooks
@@ -14,6 +14,12 @@ Available hooks are:
 * post-enter
 * pre-init
 * post-init
+* pre-merge
+	Use this hook to detect and handle merge conflicts before vcsh's native code
+	finds and errors on them. This is useful for allowing clones on top of existing
+	files.
+* post-merge
+	Use this hook to finish handling any merge conflicts found in the pre-merge hook.
 * pre-pull
 * post-pull
 * pre-push
diff --git a/doc/sample_hooks/post-merge-unclobber b/doc/sample_hooks/post-merge-unclobber
new file mode 100755
index 0000000..017a13f
--- /dev/null
+++ b/doc/sample_hooks/post-merge-unclobber
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+# This finds objects that the pre-merge script moved out of the way to
+# avoid conflicts when running git clone and moves them back to their
+# original places. The result is that the git repository gets checked out
+# and the extant objects end up back in the working directory. Git now
+# sees these as un-staged changes to the working branch and you can deal
+# with them by adding them or reverting.
+
+find -name '*.vcsh-unclobber' -execdir rename .vcsh-unclobber '' {} \;
diff --git a/doc/sample_hooks/pre-merge-unclobber b/doc/sample_hooks/pre-merge-unclobber
new file mode 100755
index 0000000..93a7319
--- /dev/null
+++ b/doc/sample_hooks/pre-merge-unclobber
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# This code does amost exactly what the native VCSH sanity checking code
+# does except that on finding a potential merge conflict, it moves the 
+# extant object out of the way temporarily. The merge then happens cleanly
+# as far as git knows, and a post-merge hook can figure out what to do with
+# the extant versions of the objects.
+
+for object in $(git ls-tree -r origin/master | awk '{print $4}'); do
+	[ -e "$object" ] && mv "$object" "$object.vcsh-unclobber" 
+done
diff --git a/vcsh b/vcsh
index 6ce5320..a6d8213 100755
--- a/vcsh
+++ b/vcsh
@@ -152,6 +152,7 @@ clone() {
 		exit
 	fi
 	git fetch
+	hook pre-merge
 	git ls-tree -r --name-only origin/master | (while read object; do
 		[ -e "$object" ] &&
 			error "'$object' exists." &&
@@ -161,6 +162,7 @@ clone() {
 		fatal "will stop after fetching and not try to merge!
   Once this situation has been resolved, run 'vcsh run $VCSH_REPO_NAME git pull' to finish cloning." 17
 	git merge origin/master
+	hook post-merge
 	hook post-clone
 	retire
 	hook post-clone-retired