| #!/bin/sh |
| # A sample hook to check commit messages created by `git commit` |
| ################################################################ |
| # |
| # This example script checks commit messages for duplicate `Signed-off-by` |
| # lines and rejects the commit if these are present. |
| # |
| # It is called by "git commit" with a single argument: the name of the file |
| # that contains the final commit message, which would be used in the commit. |
| # A a non-zero exit status after issuing an appropriate message stops the operation. |
| # The hook is allowed to edit the commit message file by rewriting the file |
| # containing it. |
| # |
| # To enable this hook remove the `.sample` suffix from this file entirely. |
| |
| # Check for duplicate Signed-off-by lines in the commit message. |
| # The following command uses grep to find lines starting with "Signed-off-by: " |
| # in the commit message file specified by the first argument `$1`. |
| # It then sorts the lines, counts the number of occurrences of each line, |
| # and removes any lines that occur only once. |
| # If there are any remaining lines, it means there are duplicate Signed-off-by lines. |
| test "$(grep '^Signed-off-by: ' "$1" | sort | uniq -c | sed -e '/^[ ]*1[ ]/d')" = "" || { |
| echo "Remove duplicate Signed-off-by lines and repeat the commit." 1>&2 |
| exit 1 |
| } |
