ENGINE-883: test if files are there to diminish annoying pings from git

scripts/git/post-checkout

@@ -2,5 +2,7 @@
 
 # Commit hash header file - if we don't run this, it won't build.
 commit_hash="$(git rev-parse HEAD)"
-sed "s/\(PEP_CURRENT_COMMIT_HASH\ =\).*/\1\"$commit_hash\"/" templates/commit_hash.h > src/commit_hash.h
+if test -f "templates/commit_hash.h"; then
+    sed "s/\(PEP_CURRENT_COMMIT_HASH\ =\).*/\1\"$commit_hash\"/" templates/commit_hash.h > src/commit_hash.h
+fi
 

scripts/git/post-commit

@@ -2,5 +2,7 @@
 
 # Commit hash header file - if we don't run this, it won't build.
 commit_hash="$(git rev-parse HEAD)"
-sed "s/\(PEP_CURRENT_COMMIT_HASH\ =\).*/\1\"$commit_hash\"/" templates/commit_hash.h > src/commit_hash.h
+if test -f "templates/commit_hash.h"; then
+    sed "s/\(PEP_CURRENT_COMMIT_HASH\ =\).*/\1\"$commit_hash\"/" templates/commit_hash.h > src/commit_hash.h
+fi
 

scripts/git/post-merge-commit

@@ -2,5 +2,7 @@
 
 # Commit hash header file - if we don't run this, it won't build.
 commit_hash="$(git rev-parse HEAD)"
-sed "s/\(PEP_CURRENT_COMMIT_HASH\ =\).*/\1\"$commit_hash\"/" templates/commit_hash.h > src/commit_hash.h
+if test -f "templates/commit_hash.h"; then
+    sed "s/\(PEP_CURRENT_COMMIT_HASH\ =\).*/\1\"$commit_hash\"/" templates/commit_hash.h > src/commit_hash.h
+fi
 

scripts/git/pre-commit

@@ -1,3 +1,6 @@
 #! /bin/sh
 
-rm src/commit_hash.h
+if test -f "src/commit_hash.h"; then
+    rm src/commit_hash.h
+fi
+