- The repository path is always quoted with single quotes.
Fetching Data From a Server
-===========================
+---------------------------
When one Git repository wants to get data that a second repository
has, the first can 'fetch' from the second. This operation determines
$ echo -e -n "0039git-upload-pack /schacon/gitbook.git\0host=example.com\0" |
nc -v example.com 9418
- 00887217a7c7e582c46cec22a130adf4b9d7d950fba0 HEAD\0multi_ack thin-pack side-band side-band-64k ofs-delta shallow no-progress include-tag
+ 00887217a7c7e582c46cec22a130adf4b9d7d950fba0 HEAD\0multi_ack thin-pack
+ side-band side-band-64k ofs-delta shallow no-progress include-tag
00441d3fcd5ced445d1abc402225c0b8a1299641f497 refs/heads/integration
003f7217a7c7e582c46cec22a130adf4b9d7d950fba0 refs/heads/master
003cb88d2441cac0977faf98efc80305012112238d9d refs/tags/v0.9
----
advertised-refs = (no-refs / list-of-refs)
+ *shallow
flush-pkt
no-refs = PKT-LINE(zero-id SP "capabilities^{}"
other-tip = obj-id SP refname LF
other-peeled = obj-id SP refname "^{}" LF
+ shallow = PKT-LINE("shallow" SP obj-id)
+
capability-list = capability *(SP capability)
capability = 1*(LC_ALPHA / DIGIT / "-" / "_")
LC_ALPHA = %x61-7A
The client MUST write all obj-ids which it only has shallow copies
of (meaning that it does not have the parents of a commit) as
'shallow' lines so that the server is aware of the limitations of
-the client's history. Clients MUST NOT mention an obj-id which
-it does not know exists on the server.
+the client's history.
The client now sends the maximum commit history depth it wants for
this transaction, which is the number of commits it wants from the
tip of the history, if any, as a 'deepen' line. A depth of 0 is the
same as not making a depth request. The client does not want to receive
-any commits beyond this depth, nor objects needed only to complete
-those commits. Commits whose parents are not received as a result are
-defined as shallow and marked as such in the server. This information
-is sent back to the client in the next step.
+any commits beyond this depth, nor does it want objects needed only to
+complete those commits. Commits whose parents are not received as a
+result are defined as shallow and marked as such in the server. This
+information is sent back to the client in the next step.
Once all the 'want's and 'shallow's (and optional 'deepen') are
transferred, clients MUST send a flush-pkt, to tell the server side
----
If the client has requested a positive depth, the server will compute
-the set of commits which are no deeper than the desired depth, starting
-at the client's wants. The server writes 'shallow' lines for each
+the set of commits which are no deeper than the desired depth. The set
+of commits start at the client's wants.
+
+The server writes 'shallow' lines for each
commit whose parents will not be sent as a result. The server writes
an 'unshallow' line for each commit which the client has indicated is
shallow, but is no longer shallow at the currently requested depth
ancestor is found before we give up entirely.
Once the 'done' line is read from the client, the server will either
-send a final 'ACK obj-id' or it will send a 'NAK'. The server only sends
+send a final 'ACK obj-id' or it will send a 'NAK'. 'obj-id' is the object
+name of the last commit determined to be common. The server only sends
ACK after 'done' if there is at least one common base and multi_ack or
multi_ack_detailed is enabled. The server always sends NAK after 'done'
if there is no common base found.
A simple clone may look like this (with no 'have' lines):
----
- C: 0054want 74730d410fcb6603ace96f1dc55ea6196122532d\0multi_ack \
+ C: 0054want 74730d410fcb6603ace96f1dc55ea6196122532d multi_ack \
side-band-64k ofs-delta\n
C: 0032want 7d1665144a3a975c05f1f43902ddaf084e784dbe\n
C: 0032want 5a3f6be755bbb7deae50065988cbfa1ffa9ab68a\n
An incremental update (fetch) response might look like this:
----
- C: 0054want 74730d410fcb6603ace96f1dc55ea6196122532d\0multi_ack \
+ C: 0054want 74730d410fcb6603ace96f1dc55ea6196122532d multi_ack \
side-band-64k ofs-delta\n
C: 0032want 7d1665144a3a975c05f1f43902ddaf084e784dbe\n
C: 0032want 5a3f6be755bbb7deae50065988cbfa1ffa9ab68a\n
Pushing Data To a Server
-========================
+------------------------
Pushing data to a server will invoke the 'receive-pack' process on the
server, which will allow the client to tell it which references it should
references.
----
- update-request = command-list [pack-file]
+ update-request = *shallow command-list [pack-file]
+
+ shallow = PKT-LINE("shallow" SP obj-id)
command-list = PKT-LINE(command NUL capability-list LF)
*PKT-LINE(command LF)