X-Git-Url: http://git.scottworley.com/pinch/blobdiff_plain/17d42dd500b06196b70af99e05e9d0fffaf3f38e..988531533047eac7a381e103cb59301ec165de0e:/pinch.py?ds=sidebyside

diff --git a/pinch.py b/pinch.py
index b3f65c6..8bda816 100644
--- a/pinch.py
+++ b/pinch.py
@@ -1,13 +1,14 @@
+import argparse
 import configparser
 import filecmp
 import functools
+import getpass
 import hashlib
 import operator
 import os
 import os.path
 import shutil
 import subprocess
-import sys
 import tempfile
 import types
 import urllib.parse
@@ -38,7 +39,6 @@ class Channel(types.SimpleNamespace):
     channel_html: bytes
     channel_url: str
     forwarded_url: str
-    git_cachedir: str
     git_ref: str
     git_repo: str
     git_revision: str
@@ -212,68 +212,20 @@ def fetch_resources(v: Verification, channel: Channel) -> None:
             channel.table['git-revision'].file).read(999) == channel.git_revision)
 
 
-def git_fetch(v: Verification, channel: Channel) -> 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
-    # details for my comfort.  So we re-implement here half of nix.fetchGit.
-    # :(
-
+def git_cachedir(git_repo: str) -> str:
     # TODO: Consider using pyxdg to find this path.
-    channel.git_cachedir = os.path.expanduser(
-        '~/.cache/nix-pin-channel/git/%s' %
+    return os.path.expanduser(
+        '~/.cache/pinch/git/%s' %
         digest_string(
-            channel.git_repo.encode()))
-    if not os.path.exists(channel.git_cachedir):
-        v.status("Initializing git repo")
-        process = subprocess.run(
-            ['git', 'init', '--bare', channel.git_cachedir])
-        v.result(process.returncode == 0)
-
-    have_rev = False
-    if hasattr(channel, 'git_revision'):
-        v.status('Checking if we already have this rev:')
-        process = subprocess.run(
-            ['git', '-C', channel.git_cachedir, 'cat-file', '-e', channel.git_revision])
-        if process.returncode == 0:
-            v.status('yes')
-        if process.returncode == 1:
-            v.status('no')
-        v.result(process.returncode == 0 or process.returncode == 1)
-        have_rev = process.returncode == 0
-
-    if not have_rev:
-        v.status(
-            'Fetching ref "%s" from %s' %
-            (channel.git_ref, channel.git_repo))
-        # We don't use --force here because we want to abort and freak out if forced
-        # updates are happening.
-        process = subprocess.run(['git',
-                                  '-C',
-                                  channel.git_cachedir,
-                                  'fetch',
-                                  channel.git_repo,
-                                  '%s:%s' % (channel.git_ref,
-                                             channel.git_ref)])
-        v.result(process.returncode == 0)
-        if hasattr(channel, 'git_revision'):
-            v.status('Verifying that fetch retrieved this rev')
-            process = subprocess.run(
-                ['git', '-C', channel.git_cachedir, 'cat-file', '-e', channel.git_revision])
-            v.result(process.returncode == 0)
+            git_repo.encode()))
 
-    if not hasattr(channel, 'git_revision'):
-        channel.git_revision = open(
-            os.path.join(
-                channel.git_cachedir,
-                'refs',
-                'heads',
-                channel.git_ref)).read(999).strip()
 
+def verify_git_ancestry(v: Verification, channel: Channel) -> None:
+    cachedir = git_cachedir(channel.git_repo)
     v.status('Verifying rev is an ancestor of ref')
     process = subprocess.run(['git',
                               '-C',
-                              channel.git_cachedir,
+                              cachedir,
                               'merge-base',
                               '--is-ancestor',
                               channel.git_revision,
@@ -286,7 +238,7 @@ def git_fetch(v: Verification, channel: Channel) -> None:
             channel.old_git_revision)
         process = subprocess.run(['git',
                                   '-C',
-                                  channel.git_cachedir,
+                                  cachedir,
                                   'merge-base',
                                   '--is-ancestor',
                                   channel.old_git_revision,
@@ -294,6 +246,65 @@ def git_fetch(v: Verification, channel: Channel) -> None:
         v.result(process.returncode == 0)
 
 
+def git_fetch(v: Verification, channel: Channel) -> 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
+    # details for my comfort.  So we re-implement here half of nix.fetchGit.
+    # :(
+
+    cachedir = git_cachedir(channel.git_repo)
+    if not os.path.exists(cachedir):
+        v.status("Initializing git repo")
+        process = subprocess.run(
+            ['git', 'init', '--bare', cachedir])
+        v.result(process.returncode == 0)
+
+    v.status('Fetching ref "%s" from %s' % (channel.git_ref, channel.git_repo))
+    # We don't use --force here because we want to abort and freak out if forced
+    # updates are happening.
+    process = subprocess.run(['git',
+                              '-C',
+                              cachedir,
+                              'fetch',
+                              channel.git_repo,
+                              '%s:%s' % (channel.git_ref,
+                                         channel.git_ref)])
+    v.result(process.returncode == 0)
+
+    if hasattr(channel, 'git_revision'):
+        v.status('Verifying that fetch retrieved this rev')
+        process = subprocess.run(
+            ['git', '-C', cachedir, 'cat-file', '-e', channel.git_revision])
+        v.result(process.returncode == 0)
+    else:
+        channel.git_revision = open(
+            os.path.join(
+                cachedir,
+                'refs',
+                'heads',
+                channel.git_ref)).read(999).strip()
+
+    verify_git_ancestry(v, channel)
+
+
+def ensure_git_rev_available(v: Verification, channel: Channel) -> None:
+    cachedir = git_cachedir(channel.git_repo)
+    if os.path.exists(cachedir):
+        v.status('Checking if we already have this rev:')
+        process = subprocess.run(
+            ['git', '-C', cachedir, 'cat-file', '-e', channel.git_revision])
+        if process.returncode == 0:
+            v.status('yes')
+        if process.returncode == 1:
+            v.status('no')
+        v.result(process.returncode == 0 or process.returncode == 1)
+        if process.returncode == 0:
+            verify_git_ancestry(v, channel)
+            return
+    git_fetch(v, channel)
+
+
 def compare_tarball_and_git(
         v: Verification,
         channel: Channel,
@@ -340,7 +351,7 @@ def git_checkout(v: Verification, channel: Channel, dest: str) -> None:
     v.status('Checking out corresponding git revision')
     git = subprocess.Popen(['git',
                             '-C',
-                            channel.git_cachedir,
+                            git_cachedir(channel.git_repo),
                             'archive',
                             channel.git_revision],
                            stdout=subprocess.PIPE)
@@ -352,6 +363,33 @@ 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:
+    with tempfile.TemporaryDirectory() as output_dir:
+        output_filename = os.path.join(
+            output_dir, channel.release_name + '.tar.xz')
+        with open(output_filename, 'w') as output_file:
+            v.status(
+                'Generating tarball for git revision %s' %
+                channel.git_revision)
+            git = subprocess.Popen(['git',
+                                    '-C',
+                                    git_cachedir(channel.git_repo),
+                                    'archive',
+                                    '--prefix=%s/' % channel.release_name,
+                                    channel.git_revision],
+                                   stdout=subprocess.PIPE)
+            xz = subprocess.Popen(['xz'], stdin=git.stdout, stdout=output_file)
+            xz.wait()
+            git.wait()
+            v.result(git.returncode == 0 and xz.returncode == 0)
+
+        v.status('Putting tarball in Nix store')
+        process = subprocess.run(
+            ['nix-store', '--add', output_filename], capture_output=True)
+        v.result(process.returncode == 0)
+        return process.stdout.decode().strip()
+
+
 def check_channel_metadata(
         v: Verification,
         channel: Channel,
@@ -395,34 +433,98 @@ def pin_channel(v: Verification, channel: Channel) -> None:
     fetch(v, channel)
     parse_channel(v, channel)
     fetch_resources(v, channel)
-    git_fetch(v, channel)
+    ensure_git_rev_available(v, channel)
     check_channel_contents(v, channel)
 
 
-def make_channel(conf: configparser.SectionProxy) -> Channel:
-    channel = Channel(**dict(conf.items()))
-    if hasattr(channel, 'git_revision'):
-        channel.old_git_revision = channel.git_revision
-        del channel.git_revision
-    return channel
-
-
-def main(argv: List[str]) -> None:
+def git_revision_name(v: Verification, channel: Channel) -> str:
+    v.status('Getting commit date')
+    process = subprocess.run(['git',
+                              '-C',
+                              git_cachedir(channel.git_repo),
+                              'lo',
+                              '-n1',
+                              '--format=%ct-%h',
+                              '--abbrev=11',
+                              channel.git_revision],
+                             capture_output=True)
+    v.result(process.returncode == 0 and process.stdout != '')
+    return '%s-%s' % (os.path.basename(channel.git_repo),
+                      process.stdout.decode().strip())
+
+
+def pin(args: argparse.Namespace) -> None:
     v = Verification()
     config = configparser.ConfigParser()
-    config.read_file(open(argv[1]), argv[1])
+    config.read_file(open(args.channels_file), args.channels_file)
     for section in config.sections():
-        channel = make_channel(config[section])
+        if args.channels and section not in args.channels:
+            continue
+
+        channel = Channel(**dict(config[section].items()))
+        if hasattr(channel, 'git_revision'):
+            channel.old_git_revision = channel.git_revision
+            del channel.git_revision
+
         if 'channel_url' in config[section]:
             pin_channel(v, channel)
+            config[section]['release_name'] = channel.release_name
             config[section]['tarball_url'] = channel.table['nixexprs.tar.xz'].absolute_url
             config[section]['tarball_sha256'] = channel.table['nixexprs.tar.xz'].digest
         else:
             git_fetch(v, channel)
+            config[section]['release_name'] = git_revision_name(v, channel)
         config[section]['git_revision'] = channel.git_revision
 
-    with open(argv[1], 'w') as configfile:
+    with open(args.channels_file, 'w') as configfile:
         config.write(configfile)
 
 
-main(sys.argv)
+def update(args: argparse.Namespace) -> None:
+    v = Verification()
+    config = configparser.ConfigParser()
+    config.read_file(open(args.channels_file), args.channels_file)
+    exprs = []
+    for section in config.sections():
+        if 'channel_url' in config[section]:
+            tarball = fetch_with_nix_prefetch_url(
+                v, config[section]['tarball_url'], Digest16(
+                    config[section]['tarball_sha256']))
+        else:
+            channel = Channel(**dict(config[section].items()))
+            ensure_git_rev_available(v, channel)
+            tarball = git_get_tarball(v, channel)
+        exprs.append(
+            'f: f { name = "%s"; channelName = "%s"; src = builtins.storePath "%s"; }' %
+            (config[section]['release_name'], section, tarball))
+    v.status('Installing channels with nix-env')
+    process = subprocess.run(
+        [
+            'nix-env',
+            '--profile',
+            '/nix/var/nix/profiles/per-user/%s/channels' %
+            getpass.getuser(),
+            '--show-trace',
+            '--file',
+            '<nix/unpack-channel.nix>',
+            '--install',
+            '--from-expression'] +
+        exprs)
+    v.result(process.returncode == 0)
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(prog='pinch')
+    subparsers = parser.add_subparsers(dest='mode', required=True)
+    parser_pin = subparsers.add_parser('pin')
+    parser_pin.add_argument('channels_file', type=str)
+    parser_pin.add_argument('channels', type=str, nargs='*')
+    parser_pin.set_defaults(func=pin)
+    parser_update = subparsers.add_parser('update')
+    parser_update.add_argument('channels_file', type=str)
+    parser_update.set_defaults(func=update)
+    args = parser.parse_args()
+    args.func(args)
+
+
+main()