prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Incorrect shebang in .git/hooks/pre-commit for python3 only installations
  The shebang for `.git/hooks/pre-commit` is `#!/usr/bin/env python`. I work with setups where `python3` is the only python in env.
  
  Could the shebang be the install python instead? I.e. the installation under `INSTALL_PYTHON = '/usr/bin/python3'`
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `pre_commit/commands/install_uninstall.py`
  Content:
  ```
  1 from __future__ import print_function
  2 from __future__ import unicode_literals
  3 
  4 import io
  5 import logging
  6 import os.path
  7 import sys
  8 
  9 from pre_commit import git
  10 from pre_commit import output
  11 from pre_commit.repository import repositories
  12 from pre_commit.util import cmd_output
  13 from pre_commit.util import make_executable
  14 from pre_commit.util import mkdirp
  15 from pre_commit.util import resource_text
  16 
  17 
  18 logger = logging.getLogger(__name__)
  19 
  20 # This is used to identify the hook file we install
  21 PRIOR_HASHES = (
  22     '4d9958c90bc262f47553e2c073f14cfe',
  23     'd8ee923c46731b42cd95cc869add4062',
  24     '49fd668cb42069aa1b6048464be5d395',
  25     '79f09a650522a87b0da915d0d983b2de',
  26     'e358c9dae00eac5d06b38dfdb1e33a8c',
  27 )
  28 CURRENT_HASH = '138fd403232d2ddd5efb44317e38bf03'
  29 TEMPLATE_START = '# start templated\n'
  30 TEMPLATE_END = '# end templated\n'
  31 
  32 
  33 def _hook_paths(git_root, hook_type):
  34     pth = os.path.join(git.get_git_dir(git_root), 'hooks', hook_type)
  35     return pth, '{}.legacy'.format(pth)
  36 
  37 
  38 def is_our_script(filename):
  39     if not os.path.exists(filename):
  40         return False
  41     with io.open(filename) as f:
  42         contents = f.read()
  43     return any(h in contents for h in (CURRENT_HASH,) + PRIOR_HASHES)
  44 
  45 
  46 def install(
  47         runner, store, overwrite=False, hooks=False, hook_type='pre-commit',
  48         skip_on_missing_conf=False,
  49 ):
  50     """Install the pre-commit hooks."""
  51     if cmd_output('git', 'config', 'core.hooksPath', retcode=None)[1].strip():
  52         logger.error(
  53             'Cowardly refusing to install hooks with `core.hooksPath` set.\n'
  54             'hint: `git config --unset-all core.hooksPath`',
  55         )
  56         return 1
  57 
  58     hook_path, legacy_path = _hook_paths(runner.git_root, hook_type)
  59 
  60     mkdirp(os.path.dirname(hook_path))
  61 
  62     # If we have an existing hook, move it to pre-commit.legacy
  63     if os.path.lexists(hook_path) and not is_our_script(hook_path):
  64         os.rename(hook_path, legacy_path)
  65 
  66     # If we specify overwrite, we simply delete the legacy file
  67     if overwrite and os.path.exists(legacy_path):
  68         os.remove(legacy_path)
  69     elif os.path.exists(legacy_path):
  70         output.write_line(
  71             'Running in migration mode with existing hooks at {}\n'
  72             'Use -f to use only pre-commit.'.format(legacy_path),
  73         )
  74 
  75     params = {
  76         'CONFIG': runner.config_file,
  77         'HOOK_TYPE': hook_type,
  78         'INSTALL_PYTHON': sys.executable,
  79         'SKIP_ON_MISSING_CONFIG': skip_on_missing_conf,
  80     }
  81 
  82     with io.open(hook_path, 'w') as hook_file:
  83         contents = resource_text('hook-tmpl')
  84         before, rest = contents.split(TEMPLATE_START)
  85         to_template, after = rest.split(TEMPLATE_END)
  86 
  87         hook_file.write(before + TEMPLATE_START)
  88         for line in to_template.splitlines():
  89             var = line.split()[0]
  90             hook_file.write('{} = {!r}\n'.format(var, params[var]))
  91         hook_file.write(TEMPLATE_END + after)
  92     make_executable(hook_path)
  93 
  94     output.write_line('pre-commit installed at {}'.format(hook_path))
  95 
  96     # If they requested we install all of the hooks, do so.
  97     if hooks:
  98         install_hooks(runner, store)
  99 
  100     return 0
  101 
  102 
  103 def install_hooks(runner, store):
  104     for repository in repositories(runner.config, store):
  105         repository.require_installed()
  106 
  107 
  108 def uninstall(runner, hook_type='pre-commit'):
  109     """Uninstall the pre-commit hooks."""
  110     hook_path, legacy_path = _hook_paths(runner.git_root, hook_type)
  111 
  112     # If our file doesn't exist or it isn't ours, gtfo.
  113     if not os.path.exists(hook_path) or not is_our_script(hook_path):
  114         return 0
  115 
  116     os.remove(hook_path)
  117     output.write_line('{} uninstalled'.format(hook_type))
  118 
  119     if os.path.exists(legacy_path):
  120         os.rename(legacy_path, hook_path)
  121         output.write_line('Restored previous hooks to {}'.format(hook_path))
  122 
  123     return 0
  124
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/pre_commit/commands/install_uninstall.py b/pre_commit/commands/install_uninstall.py
  --- a/pre_commit/commands/install_uninstall.py
  +++ b/pre_commit/commands/install_uninstall.py
  @@ -8,6 +8,7 @@
   
   from pre_commit import git
   from pre_commit import output
  +from pre_commit.languages import python
   from pre_commit.repository import repositories
   from pre_commit.util import cmd_output
   from pre_commit.util import make_executable
  @@ -43,6 +44,16 @@
       return any(h in contents for h in (CURRENT_HASH,) + PRIOR_HASHES)
   
   
  +def shebang():
  +    if sys.platform == 'win32':
  +        py = 'python'
  +    else:
  +        py = python.get_default_version()
  +        if py == 'default':
  +            py = 'python'
  +    return '#!/usr/bin/env {}'.format(py)
  +
  +
   def install(
           runner, store, overwrite=False, hooks=False, hook_type='pre-commit',
           skip_on_missing_conf=False,
  @@ -84,6 +95,8 @@
           before, rest = contents.split(TEMPLATE_START)
           to_template, after = rest.split(TEMPLATE_END)
   
  +        before = before.replace('#!/usr/bin/env python', shebang())
  +
           hook_file.write(before + TEMPLATE_START)
           for line in to_template.splitlines():
               var = line.split()[0]
  
verification_info: {"golden_diff": "diff --git a/pre_commit/commands/install_uninstall.py b/pre_commit/commands/install_uninstall.py\n--- a/pre_commit/commands/install_uninstall.py\n+++ b/pre_commit/commands/install_uninstall.py\n@@ -8,6 +8,7 @@\n \n from pre_commit import git\n from pre_commit import output\n+from pre_commit.languages import python\n from pre_commit.repository import repositories\n from pre_commit.util import cmd_output\n from pre_commit.util import make_executable\n@@ -43,6 +44,16 @@\n     return any(h in contents for h in (CURRENT_HASH,) + PRIOR_HASHES)\n \n \n+def shebang():\n+    if sys.platform == 'win32':\n+        py = 'python'\n+    else:\n+        py = python.get_default_version()\n+        if py == 'default':\n+            py = 'python'\n+    return '#!/usr/bin/env {}'.format(py)\n+\n+\n def install(\n         runner, store, overwrite=False, hooks=False, hook_type='pre-commit',\n         skip_on_missing_conf=False,\n@@ -84,6 +95,8 @@\n         before, rest = contents.split(TEMPLATE_START)\n         to_template, after = rest.split(TEMPLATE_END)\n \n+        before = before.replace('#!/usr/bin/env python', shebang())\n+\n         hook_file.write(before + TEMPLATE_START)\n         for line in to_template.splitlines():\n             var = line.split()[0]\n", "issue": "Incorrect shebang in .git/hooks/pre-commit for python3 only installations\nThe shebang for `.git/hooks/pre-commit` is `#!/usr/bin/env python`. I work with setups where `python3` is the only python in env.\r\n\r\nCould the shebang be the install python instead? I.e. the installation under `INSTALL_PYTHON = '/usr/bin/python3'`\n", "before_files": [{"content": "from __future__ import print_function\nfrom __future__ import unicode_literals\n\nimport io\nimport logging\nimport os.path\nimport sys\n\nfrom pre_commit import git\nfrom pre_commit import output\nfrom pre_commit.repository import repositories\nfrom pre_commit.util import cmd_output\nfrom pre_commit.util import make_executable\nfrom pre_commit.util import mkdirp\nfrom pre_commit.util import resource_text\n\n\nlogger = logging.getLogger(__name__)\n\n# This is used to identify the hook file we install\nPRIOR_HASHES = (\n    '4d9958c90bc262f47553e2c073f14cfe',\n    'd8ee923c46731b42cd95cc869add4062',\n    '49fd668cb42069aa1b6048464be5d395',\n    '79f09a650522a87b0da915d0d983b2de',\n    'e358c9dae00eac5d06b38dfdb1e33a8c',\n)\nCURRENT_HASH = '138fd403232d2ddd5efb44317e38bf03'\nTEMPLATE_START = '# start templated\\n'\nTEMPLATE_END = '# end templated\\n'\n\n\ndef _hook_paths(git_root, hook_type):\n    pth = os.path.join(git.get_git_dir(git_root), 'hooks', hook_type)\n    return pth, '{}.legacy'.format(pth)\n\n\ndef is_our_script(filename):\n    if not os.path.exists(filename):\n        return False\n    with io.open(filename) as f:\n        contents = f.read()\n    return any(h in contents for h in (CURRENT_HASH,) + PRIOR_HASHES)\n\n\ndef install(\n        runner, store, overwrite=False, hooks=False, hook_type='pre-commit',\n        skip_on_missing_conf=False,\n):\n    \"\"\"Install the pre-commit hooks.\"\"\"\n    if cmd_output('git', 'config', 'core.hooksPath', retcode=None)[1].strip():\n        logger.error(\n            'Cowardly refusing to install hooks with `core.hooksPath` set.\\n'\n            'hint: `git config --unset-all core.hooksPath`',\n        )\n        return 1\n\n    hook_path, legacy_path = _hook_paths(runner.git_root, hook_type)\n\n    mkdirp(os.path.dirname(hook_path))\n\n    # If we have an existing hook, move it to pre-commit.legacy\n    if os.path.lexists(hook_path) and not is_our_script(hook_path):\n        os.rename(hook_path, legacy_path)\n\n    # If we specify overwrite, we simply delete the legacy file\n    if overwrite and os.path.exists(legacy_path):\n        os.remove(legacy_path)\n    elif os.path.exists(legacy_path):\n        output.write_line(\n            'Running in migration mode with existing hooks at {}\\n'\n            'Use -f to use only pre-commit.'.format(legacy_path),\n        )\n\n    params = {\n        'CONFIG': runner.config_file,\n        'HOOK_TYPE': hook_type,\n        'INSTALL_PYTHON': sys.executable,\n        'SKIP_ON_MISSING_CONFIG': skip_on_missing_conf,\n    }\n\n    with io.open(hook_path, 'w') as hook_file:\n        contents = resource_text('hook-tmpl')\n        before, rest = contents.split(TEMPLATE_START)\n        to_template, after = rest.split(TEMPLATE_END)\n\n        hook_file.write(before + TEMPLATE_START)\n        for line in to_template.splitlines():\n            var = line.split()[0]\n            hook_file.write('{} = {!r}\\n'.format(var, params[var]))\n        hook_file.write(TEMPLATE_END + after)\n    make_executable(hook_path)\n\n    output.write_line('pre-commit installed at {}'.format(hook_path))\n\n    # If they requested we install all of the hooks, do so.\n    if hooks:\n        install_hooks(runner, store)\n\n    return 0\n\n\ndef install_hooks(runner, store):\n    for repository in repositories(runner.config, store):\n        repository.require_installed()\n\n\ndef uninstall(runner, hook_type='pre-commit'):\n    \"\"\"Uninstall the pre-commit hooks.\"\"\"\n    hook_path, legacy_path = _hook_paths(runner.git_root, hook_type)\n\n    # If our file doesn't exist or it isn't ours, gtfo.\n    if not os.path.exists(hook_path) or not is_our_script(hook_path):\n        return 0\n\n    os.remove(hook_path)\n    output.write_line('{} uninstalled'.format(hook_type))\n\n    if os.path.exists(legacy_path):\n        os.rename(legacy_path, hook_path)\n        output.write_line('Restored previous hooks to {}'.format(hook_path))\n\n    return 0\n", "path": "pre_commit/commands/install_uninstall.py"}], "after_files": [{"content": "from __future__ import print_function\nfrom __future__ import unicode_literals\n\nimport io\nimport logging\nimport os.path\nimport sys\n\nfrom pre_commit import git\nfrom pre_commit import output\nfrom pre_commit.languages import python\nfrom pre_commit.repository import repositories\nfrom pre_commit.util import cmd_output\nfrom pre_commit.util import make_executable\nfrom pre_commit.util import mkdirp\nfrom pre_commit.util import resource_text\n\n\nlogger = logging.getLogger(__name__)\n\n# This is used to identify the hook file we install\nPRIOR_HASHES = (\n    '4d9958c90bc262f47553e2c073f14cfe',\n    'd8ee923c46731b42cd95cc869add4062',\n    '49fd668cb42069aa1b6048464be5d395',\n    '79f09a650522a87b0da915d0d983b2de',\n    'e358c9dae00eac5d06b38dfdb1e33a8c',\n)\nCURRENT_HASH = '138fd403232d2ddd5efb44317e38bf03'\nTEMPLATE_START = '# start templated\\n'\nTEMPLATE_END = '# end templated\\n'\n\n\ndef _hook_paths(git_root, hook_type):\n    pth = os.path.join(git.get_git_dir(git_root), 'hooks', hook_type)\n    return pth, '{}.legacy'.format(pth)\n\n\ndef is_our_script(filename):\n    if not os.path.exists(filename):\n        return False\n    with io.open(filename) as f:\n        contents = f.read()\n    return any(h in contents for h in (CURRENT_HASH,) + PRIOR_HASHES)\n\n\ndef shebang():\n    if sys.platform == 'win32':\n        py = 'python'\n    else:\n        py = python.get_default_version()\n        if py == 'default':\n            py = 'python'\n    return '#!/usr/bin/env {}'.format(py)\n\n\ndef install(\n        runner, store, overwrite=False, hooks=False, hook_type='pre-commit',\n        skip_on_missing_conf=False,\n):\n    \"\"\"Install the pre-commit hooks.\"\"\"\n    if cmd_output('git', 'config', 'core.hooksPath', retcode=None)[1].strip():\n        logger.error(\n            'Cowardly refusing to install hooks with `core.hooksPath` set.\\n'\n            'hint: `git config --unset-all core.hooksPath`',\n        )\n        return 1\n\n    hook_path, legacy_path = _hook_paths(runner.git_root, hook_type)\n\n    mkdirp(os.path.dirname(hook_path))\n\n    # If we have an existing hook, move it to pre-commit.legacy\n    if os.path.lexists(hook_path) and not is_our_script(hook_path):\n        os.rename(hook_path, legacy_path)\n\n    # If we specify overwrite, we simply delete the legacy file\n    if overwrite and os.path.exists(legacy_path):\n        os.remove(legacy_path)\n    elif os.path.exists(legacy_path):\n        output.write_line(\n            'Running in migration mode with existing hooks at {}\\n'\n            'Use -f to use only pre-commit.'.format(legacy_path),\n        )\n\n    params = {\n        'CONFIG': runner.config_file,\n        'HOOK_TYPE': hook_type,\n        'INSTALL_PYTHON': sys.executable,\n        'SKIP_ON_MISSING_CONFIG': skip_on_missing_conf,\n    }\n\n    with io.open(hook_path, 'w') as hook_file:\n        contents = resource_text('hook-tmpl')\n        before, rest = contents.split(TEMPLATE_START)\n        to_template, after = rest.split(TEMPLATE_END)\n\n        before = before.replace('#!/usr/bin/env python', shebang())\n\n        hook_file.write(before + TEMPLATE_START)\n        for line in to_template.splitlines():\n            var = line.split()[0]\n            hook_file.write('{} = {!r}\\n'.format(var, params[var]))\n        hook_file.write(TEMPLATE_END + after)\n    make_executable(hook_path)\n\n    output.write_line('pre-commit installed at {}'.format(hook_path))\n\n    # If they requested we install all of the hooks, do so.\n    if hooks:\n        install_hooks(runner, store)\n\n    return 0\n\n\ndef install_hooks(runner, store):\n    for repository in repositories(runner.config, store):\n        repository.require_installed()\n\n\ndef uninstall(runner, hook_type='pre-commit'):\n    \"\"\"Uninstall the pre-commit hooks.\"\"\"\n    hook_path, legacy_path = _hook_paths(runner.git_root, hook_type)\n\n    # If our file doesn't exist or it isn't ours, gtfo.\n    if not os.path.exists(hook_path) or not is_our_script(hook_path):\n        return 0\n\n    os.remove(hook_path)\n    output.write_line('{} uninstalled'.format(hook_type))\n\n    if os.path.exists(legacy_path):\n        os.rename(legacy_path, hook_path)\n        output.write_line('Restored previous hooks to {}'.format(hook_path))\n\n    return 0\n", "path": "pre_commit/commands/install_uninstall.py"}]}