Explicitly exec hooks inside a shell.

We don't want to permit the execution of an arbitrary binary.

TBR=ilevy@chromium.org
BUG=

Review URL: https://codereview.chromium.org/21012004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@214193 0039d316-1c4b-4281-b951-d872f2087c98

git-templates/hooks/applypatch-msg

 #!/bin/sh
 
-[ -e "build/git-hooks/applypatch-msg" ] && exec "build/git-hooks/applypatch-msg" "$@"
+[ -e "build/git-hooks/applypatch-msg" ] && exec sh "build/git-hooks/applypatch-msg" "$@"
 exit 0

git-templates/hooks/post-applypatch

 #!/bin/sh
 
-[ -e "build/git-hooks/post-applypatch" ] && exec "build/git-hooks/post-applypatch" "$@"
+[ -e "build/git-hooks/post-applypatch" ] && exec sh "build/git-hooks/post-applypatch" "$@"
 exit 0

git-templates/hooks/post-checkout

 #!/bin/sh
 
-[ -e "build/git-hooks/post-checkout" ] && exec "build/git-hooks/post-checkout" "$@"
+[ -e "build/git-hooks/post-checkout" ] && exec sh "build/git-hooks/post-checkout" "$@"
 exit 0

git-templates/hooks/post-commit

 #!/bin/sh
 
-[ -e "build/git-hooks/post-commit" ] && exec "build/git-hooks/post-commit" "$@"
+[ -e "build/git-hooks/post-commit" ] && exec sh "build/git-hooks/post-commit" "$@"
 exit 0

git-templates/hooks/post-merge

 #!/bin/sh
 
-[ -e "build/git-hooks/post-merge" ] && exec "build/git-hooks/post-merge" "$@"
+[ -e "build/git-hooks/post-merge" ] && exec sh "build/git-hooks/post-merge" "$@"
 exit 0

git-templates/hooks/post-update

 #!/bin/sh
 
-[ -e "build/git-hooks/post-update" ] && exec "build/git-hooks/post-update" "$@"
+[ -e "build/git-hooks/post-update" ] && exec sh "build/git-hooks/post-update" "$@"
 exit 0

git-templates/hooks/pre-applypatch

 #!/bin/sh
 
-[ -e "build/git-hooks/pre-applypatch" ] && exec "build/git-hooks/pre-applypatch" "$@"
+[ -e "build/git-hooks/pre-applypatch" ] && exec sh "build/git-hooks/pre-applypatch" "$@"
 exit 0

git-templates/hooks/pre-auto-gc

 #!/bin/sh
 
-[ -e "build/git-hooks/pre-auto-gc" ] && exec "build/git-hooks/pre-auto-gc" "$@"
+[ -e "build/git-hooks/pre-auto-gc" ] && exec sh "build/git-hooks/pre-auto-gc" "$@"
 exit 0

git-templates/hooks/pre-commit

 #!/bin/sh
 
-[ -e "build/git-hooks/pre-commit" ] && exec "build/git-hooks/pre-commit" "$@"
+[ -e "build/git-hooks/pre-commit" ] && exec sh "build/git-hooks/pre-commit" "$@"
 exit 0

git-templates/hooks/pre-rebase

 #!/bin/sh
 
-[ -e "build/git-hooks/pre-rebase" ] && exec "build/git-hooks/pre-rebase" "$@"
+[ -e "build/git-hooks/pre-rebase" ] && exec sh "build/git-hooks/pre-rebase" "$@"
 exit 0

git-templates/hooks/prepare-commit-msg

 #!/bin/sh
 
-[ -e "build/git-hooks/prepare-commit-msg" ] && exec "build/git-hooks/prepare-commit-msg" "$@"
+[ -e "build/git-hooks/prepare-commit-msg" ] && exec sh "build/git-hooks/prepare-commit-msg" "$@"
 exit 0