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a010615cf2
Author | SHA1 | Date |
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David Doblas Jiménez | a010615cf2 | |
David Doblas Jiménez | 9634544d68 |
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@ -0,0 +1,24 @@
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- cat-file: Print hashed objects
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This command is the "opposite" of `hash-object`: it can print an object by its
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OID. Its implementation just reads the file at ".ugit/objects/{OID}".
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The names `hash-object` and `cat-file` aren't the clearest of names, but they
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are the names that Git uses so we'll stick to them for consistency.
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We can now try the full cycle:
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```
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$ cd /tmp/new
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$ ugit init
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Initialized empty ugit repository in /tmp/new/.ugit
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$ echo some file > bla
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$ ugit hash-object bla
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0e08b5e8c10abc3e455b75286ba4a1fbd56e18a5
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$ ugit cat-file 0e08b5e8c10abc3e455b75286ba4a1fbd56e18a5
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some file
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```
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Note that the name of the file (bla) wasn't preserved as part of this process,
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because, again, the object database is just about storing bytes for later
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retrieval and it doesn't care which filename the bytes came from.
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13
ugit/cli.py
13
ugit/cli.py
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@ -1,6 +1,8 @@
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import argparse
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from pathlib import Path
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import argparse
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import sys
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from . import data
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@ -18,6 +20,10 @@ def parse_args():
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init_parser = commands.add_parser("init")
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init_parser.set_defaults(func=init)
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cat_file_parser = commands.add_parser("cat-file")
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cat_file_parser.set_defaults(func=cat_file)
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cat_file_parser.add_argument("object")
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hash_object_parser = commands.add_parser("hash-object")
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hash_object_parser.set_defaults(func=hash_object)
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hash_object_parser.add_argument("file")
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@ -33,3 +39,8 @@ def init(args):
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def hash_object(args):
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with open(args.file, "rb") as f:
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print(data.hash_object(f.read()))
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def cat_file(args):
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sys.stdout.flush()
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sys.stdout.buffer.write(data.get_object(args.object))
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@ -15,3 +15,8 @@ def hash_object(data):
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with open(f"{GIT_DIR}/objects/{oid}", "wb") as out:
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out.write(data)
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return oid
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def get_object(oid):
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with open(f"{GIT_DIR}/objects/{oid}", "rb") as f:
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return f.read()
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