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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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"""Sphinx build wrapper that handles Kernel-specific business rules:
- it gets the Kernel build environment vars;- it determines what's the best parallelism;- it handles SPHINXDIRS
This tool ensures that MIN_PYTHON_VERSION is satisfied. If version isbelow that, it seeks for a new Python version. If found, it re-runs usingthe newer version."""
import argparseimport localeimport osimport reimport shleximport shutilimport subprocessimport sys
from concurrent import futuresfrom glob import glob
LIB_DIR = "../lib/python"SRC_DIR = os.path.dirname(os.path.realpath(__file__))
sys.path.insert(0, os.path.join(SRC_DIR, LIB_DIR))
from kdoc.python_version import PythonVersionfrom kdoc.latex_fonts import LatexFontCheckerfrom jobserver import JobserverExec # pylint: disable=C0413,C0411,E0401
## Some constants#VENV_DEFAULT = "sphinx_latest"MIN_PYTHON_VERSION = PythonVersion("3.7").versionPAPER = ["", "a4", "letter"]
TARGETS = { "cleandocs": { "builder": "clean" }, "linkcheckdocs": { "builder": "linkcheck" }, "htmldocs": { "builder": "html" }, "epubdocs": { "builder": "epub", "out_dir": "epub" }, "texinfodocs": { "builder": "texinfo", "out_dir": "texinfo" }, "infodocs": { "builder": "texinfo", "out_dir": "texinfo" }, "mandocs": { "builder": "man", "out_dir": "man" }, "latexdocs": { "builder": "latex", "out_dir": "latex" }, "pdfdocs": { "builder": "latex", "out_dir": "latex" }, "xmldocs": { "builder": "xml", "out_dir": "xml" },}
## SphinxBuilder class#
class SphinxBuilder: """ Handles a sphinx-build target, adding needed arguments to build with the Kernel. """
def get_path(self, path, use_cwd=False, abs_path=False): """ Ancillary routine to handle patches the right way, as shell does.
It first expands "~" and "~user". Then, if patch is not absolute, join self.srctree. Finally, if requested, convert to abspath. """
path = os.path.expanduser(path) if not path.startswith("/"): if use_cwd: base = os.getcwd() else: base = self.srctree
path = os.path.join(base, path)
if abs_path: return os.path.abspath(path)
return path
def check_rust(self, sphinxdirs): """ Checks if Rust is enabled """ config = os.path.join(self.srctree, ".config")
if not {'.', 'rust'}.intersection(sphinxdirs): return False
if not os.path.isfile(config): return False
re_rust = re.compile(r"CONFIG_RUST=(m|y)")
try: with open(config, "r", encoding="utf-8") as fp: for line in fp: if re_rust.match(line): return True
except OSError as e: print(f"Failed to open {config}", file=sys.stderr) return False
return False
def get_sphinx_extra_opts(self, n_jobs): """ Get the number of jobs to be used for docs build passed via command line and desired sphinx verbosity.
The number of jobs can be on different places:
1) It can be passed via "-j" argument; 2) The SPHINXOPTS="-j8" env var may have "-j"; 3) if called via GNU make, -j specifies the desired number of jobs. with GNU makefile, this number is available via POSIX jobserver; 4) if none of the above is available, it should default to "-jauto", and let sphinx decide the best value. """
# # SPHINXOPTS env var, if used, contains extra arguments to be used # by sphinx-build time. Among them, it may contain sphinx verbosity # and desired number of parallel jobs. # parser = argparse.ArgumentParser() parser.add_argument('-j', '--jobs', type=int) parser.add_argument('-q', '--quiet', action='store_true') parser.add_argument('-v', '--verbose', default=0, action='count')
# # Other sphinx-build arguments go as-is, so place them # at self.sphinxopts, using shell parser # sphinxopts = shlex.split(os.environ.get("SPHINXOPTS", ""))
# # Build a list of sphinx args, honoring verbosity here if specified #
sphinx_args, self.sphinxopts = parser.parse_known_args(sphinxopts)
verbose = sphinx_args.verbose if self.verbose: verbose += 1
if sphinx_args.quiet is True: verbose = 0
# # If the user explicitly sets "-j" at command line, use it. # Otherwise, pick it from SPHINXOPTS args # if n_jobs: self.n_jobs = n_jobs elif sphinx_args.jobs: self.n_jobs = sphinx_args.jobs else: self.n_jobs = None
if verbose < 1: self.sphinxopts += ["-q"] else: for i in range(1, sphinx_args.verbose): self.sphinxopts += ["-v"]
def __init__(self, builddir, venv=None, verbose=False, n_jobs=None, interactive=None): """Initialize internal variables""" self.venv = venv self.verbose = None
# # Normal variables passed from Kernel's makefile # self.kernelversion = os.environ.get("KERNELVERSION", "unknown") self.kernelrelease = os.environ.get("KERNELRELEASE", "unknown") self.pdflatex = os.environ.get("PDFLATEX", "xelatex")
# # Kernel main Makefile defines a PYTHON3 variable whose default is # "python3". When set to a different value, it allows running a # diferent version than the default official python3 package. # Several distros package python3xx-sphinx packages with newer # versions of Python and sphinx-build. # # Honor such variable different than default # self.python = os.environ.get("PYTHON3") if self.python == "python3": self.python = None
if not interactive: self.latexopts = os.environ.get("LATEXOPTS", "-interaction=batchmode -no-shell-escape") else: self.latexopts = os.environ.get("LATEXOPTS", "")
if not verbose: try: verbose = bool(int(os.environ.get("KBUILD_VERBOSE", 0))) except ValueError: # Handles an eventual case where verbosity is not a number # like KBUILD_VERBOSE="" verbose = False
if verbose is not None: self.verbose = verbose
# # Source tree directory. This needs to be at os.environ, as # Sphinx extensions use it # self.srctree = os.environ.get("srctree") if not self.srctree: self.srctree = "." os.environ["srctree"] = self.srctree
# # Now that we can expand srctree, get other directories as well # self.sphinxbuild = os.environ.get("SPHINXBUILD", "sphinx-build") self.kerneldoc = self.get_path(os.environ.get("KERNELDOC", "tools/docs/kernel-doc")) self.builddir = self.get_path(builddir, use_cwd=True, abs_path=True)
# # Get directory locations for LaTeX build toolchain # self.pdflatex_cmd = shutil.which(self.pdflatex) self.latexmk_cmd = shutil.which("latexmk")
self.env = os.environ.copy()
self.get_sphinx_extra_opts(n_jobs)
# # If venv command line argument is specified, run Sphinx from venv # if venv: bin_dir = os.path.join(venv, "bin") if not os.path.isfile(os.path.join(bin_dir, "activate")): sys.exit(f"Venv {venv} not found.")
# "activate" virtual env self.env["PATH"] = bin_dir + ":" + self.env["PATH"] self.env["VIRTUAL_ENV"] = venv if "PYTHONHOME" in self.env: del self.env["PYTHONHOME"] print(f"Setting venv to {venv}")
def run_sphinx(self, sphinx_build, build_args, *args, **pwargs): """ Executes sphinx-build using current python3 command.
When calling via GNU make, POSIX jobserver is used to tell how many jobs are still available from a job pool. claim all remaining jobs, as we don't want sphinx-build to run in parallel with other jobs.
Despite that, the user may actually force a different value than the number of available jobs via command line.
The "with" logic here is used to ensure that the claimed jobs will be freed once subprocess finishes """
with JobserverExec() as jobserver: if jobserver.claim: # # when GNU make is used, claim available jobs from jobserver # n_jobs = str(jobserver.claim) else: # # Otherwise, let sphinx decide by default # n_jobs = "auto"
# # If explicitly requested via command line, override default # if self.n_jobs: n_jobs = str(self.n_jobs)
# # We can't simply call python3 sphinx-build, as OpenSUSE # Tumbleweed uses an ELF binary file (/usr/bin/alts) to switch # between different versions of sphinx-build. So, only call it # prepending "python3.xx" when PYTHON3 variable is not default. # if self.python: cmd = [self.python] else: cmd = []
cmd += [sphinx_build] cmd += [f"-j{n_jobs}"] cmd += build_args cmd += self.sphinxopts
if self.verbose: print(" ".join(cmd))
return subprocess.call(cmd, *args, **pwargs)
def handle_html(self, css, output_dir): """ Extra steps for HTML and epub output.
For such targets, we need to ensure that CSS will be properly copied to the output _static directory """
if css: css = os.path.expanduser(css) if not css.startswith("/"): css = os.path.join(self.srctree, css)
static_dir = os.path.join(output_dir, "_static") os.makedirs(static_dir, exist_ok=True)
try: shutil.copy2(css, static_dir) except (OSError, IOError) as e: print(f"Warning: Failed to copy CSS: {e}", file=sys.stderr)
def build_pdf_file(self, latex_cmd, from_dir, path): """Builds a single pdf file using latex_cmd""" try: subprocess.run(latex_cmd + [path], cwd=from_dir, check=True, env=self.env)
return True except subprocess.CalledProcessError: return False
def pdf_parallel_build(self, tex_suffix, latex_cmd, tex_files, n_jobs): """Build PDF files in parallel if possible""" builds = {} build_failed = False max_len = 0 has_tex = False
# # LaTeX PDF error code is almost useless for us: # any warning makes it non-zero. For kernel doc builds it always return # non-zero even when build succeeds. So, let's do the best next thing: # Ignore build errors. At the end, check if all PDF files were built, # printing a summary with the built ones and returning 0 if all of # them were actually built. # with futures.ThreadPoolExecutor(max_workers=n_jobs) as executor: jobs = {}
for from_dir, pdf_dir, entry in tex_files: name = entry.name
if not name.endswith(tex_suffix): continue
name = name[:-len(tex_suffix)] has_tex = True
future = executor.submit(self.build_pdf_file, latex_cmd, from_dir, entry.path) jobs[future] = (from_dir, pdf_dir, name)
for future in futures.as_completed(jobs): from_dir, pdf_dir, name = jobs[future]
pdf_name = name + ".pdf" pdf_from = os.path.join(from_dir, pdf_name) pdf_to = os.path.join(pdf_dir, pdf_name) out_name = os.path.relpath(pdf_to, self.builddir) max_len = max(max_len, len(out_name))
try: success = future.result()
if success and os.path.exists(pdf_from): os.rename(pdf_from, pdf_to)
# # if verbose, get the name of built PDF file # if self.verbose: builds[out_name] = "SUCCESS" else: builds[out_name] = "FAILED" build_failed = True except futures.Error as e: builds[out_name] = f"FAILED ({repr(e)})" build_failed = True
# # Handle case where no .tex files were found # if not has_tex: out_name = "LaTeX files" max_len = max(max_len, len(out_name)) builds[out_name] = "FAILED: no .tex files were generated" build_failed = True
return builds, build_failed, max_len
def handle_pdf(self, output_dirs, deny_vf): """ Extra steps for PDF output.
As PDF is handled via a LaTeX output, after building the .tex file, a new build is needed to create the PDF output from the latex directory. """ builds = {} max_len = 0 tex_suffix = ".tex" tex_files = []
# # Since early 2024, Fedora and openSUSE tumbleweed have started # deploying variable-font format of "Noto CJK", causing LaTeX # to break with CJK. Work around it, by denying the variable font # usage during xelatex build by passing the location of a config # file with a deny list. # # See tools/docs/lib/latex_fonts.py for more details. # if deny_vf: deny_vf = os.path.expanduser(deny_vf) if os.path.isdir(deny_vf): self.env["XDG_CONFIG_HOME"] = deny_vf
for from_dir in output_dirs: pdf_dir = os.path.join(from_dir, "../pdf") os.makedirs(pdf_dir, exist_ok=True)
if self.latexmk_cmd: latex_cmd = [self.latexmk_cmd, f"-{self.pdflatex}"] else: latex_cmd = [self.pdflatex]
latex_cmd.extend(shlex.split(self.latexopts))
# Get a list of tex files to process with os.scandir(from_dir) as it: for entry in it: if entry.name.endswith(tex_suffix): tex_files.append((from_dir, pdf_dir, entry))
# # When using make, this won't be used, as the number of jobs comes # from POSIX jobserver. So, this covers the case where build comes # from command line. On such case, serialize by default, except if # the user explicitly sets the number of jobs. # n_jobs = 1
# n_jobs is either an integer or "auto". Only use it if it is a number if self.n_jobs: try: n_jobs = int(self.n_jobs) except ValueError: pass
# # When using make, jobserver.claim is the number of jobs that were # used with "-j" and that aren't used by other make targets # with JobserverExec() as jobserver: n_jobs = 1
# # Handle the case when a parameter is passed via command line, # using it as default, if jobserver doesn't claim anything # if self.n_jobs: try: n_jobs = int(self.n_jobs) except ValueError: pass
if jobserver.claim: n_jobs = jobserver.claim
builds, build_failed, max_len = self.pdf_parallel_build(tex_suffix, latex_cmd, tex_files, n_jobs)
# # In verbose mode, print a summary with the build results per file. # Otherwise, print a single line with all failures, if any. # On both cases, return code 1 indicates build failures, # if self.verbose: msg = "Summary" msg += "\n" + "=" * len(msg) print() print(msg)
for pdf_name, pdf_file in builds.items(): print(f"{pdf_name:<{max_len}}: {pdf_file}")
print() if build_failed: msg = LatexFontChecker().check() if msg: print(msg)
sys.exit("Error: not all PDF files were created.")
elif build_failed: n_failures = len(builds) failures = ", ".join(builds.keys())
msg = LatexFontChecker().check() if msg: print(msg)
sys.exit(f"Error: Can't build {n_failures} PDF file(s): {failures}")
def handle_info(self, output_dirs): """ Extra steps for Info output.
For texinfo generation, an additional make is needed from the texinfo directory. """
for output_dir in output_dirs: try: subprocess.run(["make", "info"], cwd=output_dir, check=True) except subprocess.CalledProcessError as e: sys.exit(f"Error generating info docs: {e}")
def handle_man(self, kerneldoc, docs_dir, src_dir, output_dir): """ Create man pages from kernel-doc output """
re_kernel_doc = re.compile(r"^\.\.\s+kernel-doc::\s*(\S+)")
if docs_dir == src_dir: # # Pick the entire set of kernel-doc markups from the entire tree # kdoc_files = set([self.srctree]) else: kdoc_files = set()
for fname in glob(os.path.join(src_dir, "**"), recursive=True): if os.path.isfile(fname) and fname.endswith(".rst"): with open(fname, "r", encoding="utf-8") as in_fp: data = in_fp.read()
for line in data.split("\n"): match = re_kernel_doc.match(line) if match: if os.path.isfile(match.group(1)): kdoc_files.add(match.group(1))
if not kdoc_files: sys.exit(f"Directory {src_dir} doesn't contain kernel-doc tags")
cmd = [ kerneldoc, "-m" ] + sorted(kdoc_files) try: if self.verbose: print(" ".join(cmd))
result = subprocess.run(cmd, stdout=subprocess.PIPE, text= True)
if result.returncode: print(f"Warning: kernel-doc returned {result.returncode} warnings")
except (OSError, ValueError, subprocess.SubprocessError) as e: sys.exit(f"Failed to create man pages for {src_dir}: {repr(e)}")
fp = None try: for line in result.stdout.split("\n"): if not line.startswith(".TH"): if fp: fp.write(line + '\n') continue
if fp: fp.close()
# Use shlex here, as it handles well parameters with commas args = shlex.split(line) fname = f"{args[1]}.{args[2]}" fname = fname.replace("/", " ") fname = f"{output_dir}/{fname}"
if self.verbose: print(f"Creating {fname}") fp = open(fname, "w", encoding="utf-8") fp.write(line + '\n') finally: if fp: fp.close()
def cleandocs(self, builder): # pylint: disable=W0613 """Remove documentation output directory""" shutil.rmtree(self.builddir, ignore_errors=True)
def build(self, target, sphinxdirs=None, theme=None, css=None, paper=None, deny_vf=None, skip_sphinx=False): """ Build documentation using Sphinx. This is the core function of this module. It prepares all arguments required by sphinx-build. """
builder = TARGETS[target]["builder"] out_dir = TARGETS[target].get("out_dir", "")
# # Cleandocs doesn't require sphinx-build # if target == "cleandocs": self.cleandocs(builder) return
if theme: os.environ["DOCS_THEME"] = theme
# # Other targets require sphinx-build, so check if it exists # if not skip_sphinx: sphinxbuild = shutil.which(self.sphinxbuild, path=self.env["PATH"]) if not sphinxbuild and target != "mandocs": sys.exit(f"Error: {self.sphinxbuild} not found in PATH.\n")
if target == "pdfdocs": if not self.pdflatex_cmd and not self.latexmk_cmd: sys.exit("Error: pdflatex or latexmk required for PDF generation")
docs_dir = os.path.abspath(os.path.join(self.srctree, "Documentation"))
# # Fill in base arguments for Sphinx build # kerneldoc = self.kerneldoc if kerneldoc.startswith(self.srctree): kerneldoc = os.path.relpath(kerneldoc, self.srctree)
if not sphinxdirs: sphinxdirs = os.environ.get("SPHINXDIRS", ".")
# # sphinxdirs can be a list or a whitespace-separated string # sphinxdirs_list = [] for sphinxdir in sphinxdirs: if isinstance(sphinxdir, list): sphinxdirs_list += sphinxdir else: sphinxdirs_list += sphinxdir.split()
args = [ "-b", builder, "-c", docs_dir ]
if builder == "latex": if not paper: paper = PAPER[1]
args.extend(["-D", f"latex_elements.papersize={paper}paper"])
rustdoc = self.check_rust(sphinxdirs_list) if rustdoc: args.extend(["-t", "rustdoc"])
# # The sphinx-build tool has a bug: internally, it tries to set # locale with locale.setlocale(locale.LC_ALL, ''). This causes a # crash if language is not set. Detect and fix it. # try: locale.setlocale(locale.LC_ALL, '') except locale.Error: self.env["LC_ALL"] = "C"
# # Step 1: Build each directory in separate. # # This is not the best way of handling it, as cross-references between # them will be broken, but this is what we've been doing since # the beginning. # output_dirs = [] for sphinxdir in sphinxdirs_list: src_dir = os.path.join(docs_dir, sphinxdir) doctree_dir = os.path.join(self.builddir, ".doctrees") output_dir = os.path.join(self.builddir, sphinxdir, out_dir)
# # Make directory names canonical # src_dir = os.path.normpath(src_dir) doctree_dir = os.path.normpath(doctree_dir) output_dir = os.path.normpath(output_dir)
os.makedirs(doctree_dir, exist_ok=True) os.makedirs(output_dir, exist_ok=True)
output_dirs.append(output_dir)
build_args = args + [ "-d", doctree_dir, "-D", f"version={self.kernelversion}", "-D", f"release={self.kernelrelease}", "-D", f"kerneldoc_srctree={self.srctree}", src_dir, output_dir, ]
if target == "mandocs": self.handle_man(kerneldoc, docs_dir, src_dir, output_dir) elif not skip_sphinx: try: result = self.run_sphinx(sphinxbuild, build_args, env=self.env)
if result: sys.exit(f"Build failed: return code: {result}")
except (OSError, ValueError, subprocess.SubprocessError) as e: sys.exit(f"Build failed: {repr(e)}")
# # Ensure that each html/epub output will have needed static files # if target in ["htmldocs", "epubdocs"]: self.handle_html(css, output_dir)
# # Step 2: Some targets (PDF and info) require an extra step once # sphinx-build finishes # if target == "pdfdocs": self.handle_pdf(output_dirs, deny_vf) elif target == "infodocs": self.handle_info(output_dirs)
if rustdoc and target in ["htmldocs", "epubdocs"]: print("Building rust docs") if "MAKE" in self.env: cmd = [self.env["MAKE"]] else: cmd = ["make", "LLVM=1"]
cmd += [ "rustdoc"] if self.verbose: print(" ".join(cmd))
try: subprocess.run(cmd, check=True) except subprocess.CalledProcessError as e: print(f"Ignored errors when building rustdoc: {e}. Is RUST enabled?", file=sys.stderr)
def jobs_type(value): """ Handle valid values for -j. Accepts Sphinx "-jauto", plus a number equal or bigger than one. """ if value is None: return None
if value.lower() == 'auto': return value.lower()
try: if int(value) >= 1: return value
raise argparse.ArgumentTypeError(f"Minimum jobs is 1, got {value}") except ValueError: raise argparse.ArgumentTypeError(f"Must be 'auto' or positive integer, got {value}") # pylint: disable=W0707
EPILOG="""Besides the command line arguments, several environment variables affect itsdefault behavior, meant to be used when called via Kernel Makefile:
- KERNELVERSION: Kernel major version- KERNELRELEASE: Kernel release- KBUILD_VERBOSE: Contains the value of "make V=[0|1] variable. When V=0 (KBUILD_VERBOSE=0), sets verbose level to "-q".- SPHINXBUILD: Documentation build tool (default: "sphinx-build").- SPHINXOPTS: Extra options pased to SPHINXBUILD (default: "-j auto" and "-q" if KBUILD_VERBOSE=0). The "-v" flag can be used to increase verbosity. If V=0, the first "-v" will drop "-q".- PYTHON3: Python command to run SPHINXBUILD- PDFLATEX: LaTeX PDF engine. (default: "xelatex")- LATEXOPTS: Optional set of command line arguments to the LaTeX engine- srctree: Location of the Kernel root directory (default: ".").
"""
def main(): """ Main function. The only mandatory argument is the target. If not specified, the other arguments will use default values if not specified at os.environ. """ parser = argparse.ArgumentParser(formatter_class=argparse.RawTextHelpFormatter, description=__doc__, epilog=EPILOG)
parser.add_argument("target", choices=list(TARGETS.keys()), help="Documentation target to build") parser.add_argument("--sphinxdirs", nargs="+", help="Specific directories to build") parser.add_argument("--builddir", default="output", help="Sphinx configuration file (default: %(default)s)")
parser.add_argument("--theme", help="Sphinx theme to use")
parser.add_argument("--css", help="Custom CSS file for HTML/EPUB")
parser.add_argument("--paper", choices=PAPER, default=PAPER[0], help="Paper size for LaTeX/PDF output")
parser.add_argument('--deny-vf', help="Configuration to deny variable fonts on pdf builds")
parser.add_argument("-v", "--verbose", action='store_true', help="place build in verbose mode")
parser.add_argument('-j', '--jobs', type=jobs_type, help="Sets number of jobs to use with sphinx-build(default: auto)")
parser.add_argument('-i', '--interactive', action='store_true', help="Change latex default to run in interactive mode")
parser.add_argument('-s', '--skip-sphinx-build', action='store_true', help="Skip sphinx-build step")
parser.add_argument("-V", "--venv", nargs='?', const=f'{VENV_DEFAULT}', default=None, help=f'If used, run Sphinx from a venv dir (default dir: {VENV_DEFAULT})')
args = parser.parse_args()
PythonVersion.check_python(MIN_PYTHON_VERSION, show_alternatives=True, bail_out=True)
builder = SphinxBuilder(builddir=args.builddir, venv=args.venv, verbose=args.verbose, n_jobs=args.jobs, interactive=args.interactive)
builder.build(args.target, sphinxdirs=args.sphinxdirs, theme=args.theme, css=args.css, paper=args.paper, deny_vf=args.deny_vf, skip_sphinx=args.skip_sphinx_build)
if __name__ == "__main__": main()