[PATCH 1/1] add hook pre-p4-submit

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Hook pre-p4-submit is executed before git-p4 actually submits code.
If the hook exits with non-zero value, submit process will abort.

Signed-off-by: Chen Bin <chenbin.sh@xxxxxxxxx>
---
 git-p4.py               |  6 ++++++
 t/t9800-git-p4-basic.sh | 22 ++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/git-p4.py b/git-p4.py
index b449db1cc..69ee9ce41 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -2303,6 +2303,12 @@ def run(self, args):
             sys.exit("number of commits (%d) must match number of shelved changelist (%d)" %
                      (len(commits), num_shelves))
 
+        # locate hook at `.git/hooks/pre-p4-submit`
+        hook_file = os.path.join(read_pipe("git rev-parse --git-dir").strip(), "hooks", "pre-p4-submit")
+        # Execute hook. If it exit with non-zero value, do NOT continue.
+        if os.path.isfile(hook_file) and os.access(hook_file, os.X_OK) and subprocess.call([hook_file]) != 0:
+            sys.exit(1)
+
         #
         # Apply the commits, one at a time.  On failure, ask if should
         # continue to try the rest of the patches, or quit.
diff --git a/t/t9800-git-p4-basic.sh b/t/t9800-git-p4-basic.sh
index 4849edc4e..48b768fa7 100755
--- a/t/t9800-git-p4-basic.sh
+++ b/t/t9800-git-p4-basic.sh
@@ -261,6 +261,28 @@ test_expect_success 'unresolvable host in P4PORT should display error' '
 	)
 '
 
+# Test following scenarios:
+#   - Without hook ".git/hooks/pre-p4-submit", submit should continue
+#   - With hook returning 0, submit should continue
+#   - With hook returning 1, submit should abort
+test_expect_success 'run hook pre-p4-submit before submit' '
+	test_when_finished cleanup_git &&
+	git p4 clone --dest="$git" //depot &&
+	(
+		cd "$git" &&
+		echo "hello world" >hello.txt &&
+		git add hello.txt &&
+		git commit -m "add hello.txt" &&
+		git config git-p4.skipSubmitEdit true &&
+		git p4 submit --dry-run | grep "Would apply" &&
+		mkdir -p .git/hooks &&
+		: >.git/hooks/pre-p4-submit && chmod +x .git/hooks/pre-p4-submit &&
+		git p4 submit --dry-run | grep "Would apply" &&
+		echo #!/bin/sh && echo exit 1 >.git/hooks/pre-p4-submit &&
+		git p4 submit --dry-run | grep "Would apply" || echo "Abort submit"
+	)
+'
+
 test_expect_success 'submit from detached head' '
 	test_when_finished cleanup_git &&
 	git p4 clone --dest="$git" //depot &&
-- 
2.18.0




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