Create a sample of a script for a pre-push hook.  The main purpose is to
illustrate how a script may parse the parameters which are supplied to
such a hook.  The script may also be useful to some people as-is for
avoiding to push commits which are marked as a work in progress.

Signed-off-by: Aaron Schrab <aa...@schrab.com>
---
 templates/hooks--pre-push.sample |   63 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 templates/hooks--pre-push.sample

diff --git a/templates/hooks--pre-push.sample b/templates/hooks--pre-push.sample
new file mode 100644
index 0000000..1d3b4a3
--- /dev/null
+++ b/templates/hooks--pre-push.sample
@@ -0,0 +1,63 @@
+#!/bin/sh
+
+# An example hook script to verify what is about to be pushed.
+# Called by "git push" after it has checked the remote status, but before
+# anything has been pushed.  If this script exits with a non-zero status
+# nothing will be pushed.
+#
+# This hook is called with the following parameters:
+#
+# $1 -- Name of the remote to which the push is being done
+# $2 -- URL to which the push is being done
+#
+#   If pushing without using a named remote those arguments will be equal.
+#
+# Further arguments provide information about the commits which are being
+# pushed in the form:
+#
+#   <local ref>:<local sha1>:<remote ref>:<remote sha1>
+#
+# This sample shows how to prevent push of commits where the log
+# message starts with "WIP" (work in progress).
+
+remote="$1"
+url="$2"
+shift 2
+
+z40=0000000000000000000000000000000000000000
+
+old_ifs="$IFS"
+for to_push in "$@"
+do
+       # Split the value into its parts
+       IFS=:
+       set -- $to_push
+       IFS="$old_ifs"
+
+       local_ref="$1"
+       local_sha="$2"
+       remote_ref="$3"
+       remote_sha="$4"
+
+       if [ "$local_sha" = $z40 ]
+       then
+               range=''
+               # Handle deletes
+       else
+               if [ "$remote_sha" = $z40 ]
+               then
+                       range="$local_sha"
+               else
+                       range="$remote_sha..$local_sha"
+               fi
+
+               commit=`git rev-list -n 1 --grep '^WIP' "$range"`
+               if [ -n "$commit" ]
+               then
+                       echo "Found WIP commit in $local_ref, not pushing"
+                       exit 1
+               fi
+       fi
+done
+
+exit 0
-- 
1.7.10.4

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