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"""
BitBake 'Fetch' implementation for Go modules
The gomod fetcher is used to download Go modules to the module cache from a
module proxy.
Example SRC_URI:
SRC_URI += "gomod://golang.org/x/net;version=v0.9.0;sha256sum=..."
Required SRC_URI parameters:
- version
The version of the module.
Optional SRC_URI parameters:
- mod
Fetch and unpack the go.mod file only instead of the complete module.
The go command may need to download go.mod files for many different modules
when computing the build list, and go.mod files are much smaller than
module zip files.
The default is "0", set mod=1 for the go.mod file only.
- sha256sum
The checksum of the module zip file, or the go.mod file in case of fetching
only the go.mod file. Alternatively, set the SRC_URI varible flag for
"module@version.sha256sum".
Related variables:
- GO_MOD_PROXY
The module proxy used by the fetcher.
- GO_MOD_CACHE_DIR
The directory where the module cache is located.
This must match the exported GOMODCACHE variable for the go command to find
the downloaded modules.
See the Go modules reference, https://go.dev/ref/mod, for more information
about the module cache, module proxies and version control systems.
"""
import os
import re
import shutil
import zipfile
import bb
from bb.fetch2 import FetchError
from bb.fetch2 import MissingParameterError
from bb.fetch2.wget import Wget
def escape(path):
"""Escape capital letters using exclamation points."""
return re.sub(r'([A-Z])', lambda m: '!' + m.group(1).lower(), path)
class GoMod(Wget):
"""Class to fetch Go modules from a Go module proxy via wget"""
def supports(self, ud, d):
"""Check to see if a given URL is for this fetcher."""
return ud.type == 'gomod'
def urldata_init(self, ud, d):
"""Set up to download the module from the module proxy.
Set up to download the module zip file to the module cache directory
and unpack the go.mod file (unless downloading only the go.mod file):
cache/download/<module>/@v/<version>.zip: The module zip file.
cache/download/<module>/@v/<version>.mod: The go.mod file.
"""
proxy = d.getVar('GO_MOD_PROXY') or 'proxy.golang.org'
moddir = d.getVar('GO_MOD_CACHE_DIR') or 'pkg/mod'
if 'version' not in ud.parm:
raise MissingParameterError('version', ud.url)
module = ud.host + ud.path
ud.parm['module'] = module
# Set URL and filename for wget download
path = escape(module + '/@v/' + ud.parm['version'])
if ud.parm.get('mod', '0') == '1':
path += '.mod'
else:
path += '.zip'
ud.parm['unpack'] = '0'
ud.url = bb.fetch2.encodeurl(
('https', proxy, '/' + path, None, None, None))
ud.parm['downloadfilename'] = path
# Set name parameter if sha256sum is set in recipe
name = f"{module}@{ud.parm['version']}"
if d.getVarFlag('SRC_URI', name + '.sha256sum'):
ud.parm['name'] = name
# Set subdir for unpack
ud.parm['subdir'] = os.path.join(moddir, 'cache/download',
os.path.dirname(path))
super().urldata_init(ud, d)
def unpack(self, ud, rootdir, d):
"""Unpack the module in the module cache."""
# Unpack the module zip file or go.mod file
super().unpack(ud, rootdir, d)
if ud.localpath.endswith('.zip'):
# Unpack the go.mod file from the zip file
module = ud.parm['module']
unpackdir = os.path.join(rootdir, ud.parm['subdir'])
name = os.path.basename(ud.localpath).rsplit('.', 1)[0] + '.mod'
bb.note(f"Unpacking {name} to {unpackdir}/")
with zipfile.ZipFile(ud.localpath) as zf:
with open(os.path.join(unpackdir, name), mode='wb') as mf:
try:
f = module + '@' + ud.parm['version'] + '/go.mod'
shutil.copyfileobj(zf.open(f), mf)
except KeyError:
# If the module does not have a go.mod file, synthesize
# one containing only a module statement.
mf.write(f'module {module}\n'.encode())
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