Rename Channel -> TarrableSearchPath

[pinch] / pinch.py

diff --git a/pinch.py b/pinch.py
index 34c63f1d4b418380142baf28334507485f3f372f..662b425286b87a8c1ac25ac7ee318e26ca2ee466 100644 (file)
--- a/pinch.py
+++ b/pinch.py
@@ -101,7 +101,7 @@ class AliasSearchPath(SearchPath):
         assert not hasattr(self, 'git_repo')
 
 
-class Channel(SearchPath):
+class TarrableSearchPath(SearchPath):
     channel_html: bytes
     channel_url: str
     forwarded_url: str
@@ -170,7 +170,7 @@ def compare(a: str, b: str) -> Tuple[List[str], List[str], List[str]]:
     return filecmp.cmpfiles(a, b, files, shallow=False)
 
 
-def fetch(v: Verification, channel: Channel) -> None:
+def fetch(v: Verification, channel: TarrableSearchPath) -> None:
     v.status('Fetching channel')
     request = urllib.request.urlopen(channel.channel_url, timeout=10)
     channel.channel_html = request.read()
@@ -179,7 +179,7 @@ def fetch(v: Verification, channel: Channel) -> None:
     v.check('Got forwarded', channel.channel_url != channel.forwarded_url)
 
 
-def parse_channel(v: Verification, channel: Channel) -> None:
+def parse_channel(v: Verification, channel: TarrableSearchPath) -> None:
     v.status('Parsing channel description as XML')
     d = xml.dom.minidom.parseString(channel.channel_html)
     v.ok()
@@ -259,7 +259,7 @@ def fetch_with_nix_prefetch_url(
     return path  # type: ignore  # (for old mypy)
 
 
-def fetch_resources(v: Verification, channel: Channel) -> None:
+def fetch_resources(v: Verification, channel: TarrableSearchPath) -> None:
     for resource in ['git-revision', 'nixexprs.tar.xz']:
         fields = channel.table[resource]
         fields.absolute_url = urllib.parse.urljoin(
@@ -279,7 +279,7 @@ def git_cachedir(git_repo: str) -> str:
         digest_string(git_repo.encode()))
 
 
-def tarball_cache_file(channel: Channel) -> str:
+def tarball_cache_file(channel: TarrableSearchPath) -> str:
     return os.path.join(
         xdg.XDG_CACHE_HOME,
         'pinch/git-tarball',
@@ -289,7 +289,7 @@ def tarball_cache_file(channel: Channel) -> str:
          channel.release_name))
 
 
-def verify_git_ancestry(v: Verification, channel: Channel) -> None:
+def verify_git_ancestry(v: Verification, channel: TarrableSearchPath) -> None:
     cachedir = git_cachedir(channel.git_repo)
     v.status('Verifying rev is an ancestor of ref')
     process = subprocess.run(['git',
@@ -315,7 +315,7 @@ def verify_git_ancestry(v: Verification, channel: Channel) -> None:
         v.result(process.returncode == 0)
 
 
-def git_fetch(v: Verification, channel: Channel) -> None:
+def git_fetch(v: Verification, channel: TarrableSearchPath) -> None:
     # It would be nice if we could share the nix git cache, but as of the time
     # of writing it is transitioning from gitv2 (deprecated) to gitv3 (not ready
     # yet), and trying to straddle them both is too far into nix implementation
@@ -357,7 +357,9 @@ def git_fetch(v: Verification, channel: Channel) -> None:
     verify_git_ancestry(v, channel)
 
 
-def ensure_git_rev_available(v: Verification, channel: Channel) -> None:
+def ensure_git_rev_available(
+        v: Verification,
+        channel: TarrableSearchPath) -> None:
     cachedir = git_cachedir(channel.git_repo)
     if os.path.exists(cachedir):
         v.status('Checking if we already have this rev:')
@@ -376,7 +378,7 @@ def ensure_git_rev_available(v: Verification, channel: Channel) -> None:
 
 def compare_tarball_and_git(
         v: Verification,
-        channel: Channel,
+        channel: TarrableSearchPath,
         channel_contents: str,
         git_contents: str) -> None:
     v.status('Comparing channel tarball with git checkout')
@@ -407,7 +409,10 @@ def compare_tarball_and_git(
         len(benign_errors) == len(expected_errors))
 
 
-def extract_tarball(v: Verification, channel: Channel, dest: str) -> None:
+def extract_tarball(
+        v: Verification,
+        channel: TarrableSearchPath,
+        dest: str) -> None:
     v.status('Extracting tarball %s' %
              channel.table['nixexprs.tar.xz'].file)
     shutil.unpack_archive(
@@ -416,7 +421,10 @@ def extract_tarball(v: Verification, channel: Channel, dest: str) -> None:
     v.ok()
 
 
-def git_checkout(v: Verification, channel: Channel, dest: str) -> None:
+def git_checkout(
+        v: Verification,
+        channel: TarrableSearchPath,
+        dest: str) -> None:
     v.status('Checking out corresponding git revision')
     git = subprocess.Popen(['git',
                             '-C',
@@ -433,7 +441,7 @@ def git_checkout(v: Verification, channel: Channel, dest: str) -> None:
     v.result(git.returncode == 0 and tar.returncode == 0)
 
 
-def git_get_tarball(v: Verification, channel: Channel) -> str:
+def git_get_tarball(v: Verification, channel: TarrableSearchPath) -> str:
     cache_file = tarball_cache_file(channel)
     if os.path.exists(cache_file):
         cached_tarball = open(cache_file).read(9999)
@@ -472,7 +480,7 @@ def git_get_tarball(v: Verification, channel: Channel) -> str:
 
 def check_channel_metadata(
         v: Verification,
-        channel: Channel,
+        channel: TarrableSearchPath,
         channel_contents: str) -> None:
     v.status('Verifying git commit in channel tarball')
     v.result(
@@ -494,7 +502,9 @@ def check_channel_metadata(
     v.result(channel.release_name.endswith(version_suffix))
 
 
-def check_channel_contents(v: Verification, channel: Channel) -> None:
+def check_channel_contents(
+        v: Verification,
+        channel: TarrableSearchPath) -> None:
     with tempfile.TemporaryDirectory() as channel_contents, \
             tempfile.TemporaryDirectory() as git_contents:
 
@@ -509,7 +519,7 @@ def check_channel_contents(v: Verification, channel: Channel) -> None:
     v.ok()
 
 
-def pin_channel(v: Verification, channel: Channel) -> None:
+def pin_channel(v: Verification, channel: TarrableSearchPath) -> None:
     fetch(v, channel)
     parse_channel(v, channel)
     fetch_resources(v, channel)
@@ -517,7 +527,7 @@ def pin_channel(v: Verification, channel: Channel) -> None:
     check_channel_contents(v, channel)
 
 
-def git_revision_name(v: Verification, channel: Channel) -> str:
+def git_revision_name(v: Verification, channel: TarrableSearchPath) -> str:
     v.status('Getting commit date')
     process = subprocess.run(['git',
                               '-C',
@@ -537,7 +547,7 @@ def git_revision_name(v: Verification, channel: Channel) -> str:
 def read_search_path(conf: configparser.SectionProxy) -> SearchPath:
     if 'alias_of' in conf:
         return AliasSearchPath(**dict(conf.items()))
-    return Channel(**dict(conf.items()))
+    return TarrableSearchPath(**dict(conf.items()))
 
 
 def read_config(filename: str) -> configparser.ConfigParser:
@@ -578,10 +588,10 @@ def update(args: argparse.Namespace) -> None:
     exprs: Dict[str, str] = {}
     config = read_config_files(args.channels_file)
     for section in config:
-        if 'alias_of' in config[section]:
+        sp = read_search_path(config[section])
+        if isinstance(sp, AliasSearchPath):
             assert 'git_repo' not in config[section]
             continue
-        sp = read_search_path(config[section])
         tarball = sp.fetch(v, section, config[section])
         exprs[section] = (
             'f: f { name = "%s"; channelName = "%%s"; src = builtins.storePath "%s"; }' %