diff options
Diffstat (limited to 'Documentation/technical/pack-protocol.txt')
| -rw-r--r-- | Documentation/technical/pack-protocol.txt | 92 |
1 files changed, 75 insertions, 17 deletions
diff --git a/Documentation/technical/pack-protocol.txt b/Documentation/technical/pack-protocol.txt index a7004c63e7..462e20645f 100644 --- a/Documentation/technical/pack-protocol.txt +++ b/Documentation/technical/pack-protocol.txt @@ -60,6 +60,13 @@ process on the server side over the Git protocol is this: "0039git-upload-pack /schacon/gitbook.git\0host=example.com\0" | nc -v example.com 9418 +If the server refuses the request for some reasons, it could abort +gracefully with an error message. + +---- + error-line = PKT-LINE("ERR" SP explanation-text) +---- + SSH Transport ------------- @@ -110,7 +117,7 @@ A few things to remember here: - 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 @@ -127,7 +134,8 @@ with the object name that each reference currently points to. $ 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 @@ -153,6 +161,7 @@ MUST peel the ref if it's an annotated tag. ---- advertised-refs = (no-refs / list-of-refs) + *shallow flush-pkt no-refs = PKT-LINE(zero-id SP "capabilities^{}" @@ -166,6 +175,8 @@ MUST peel the ref if it's an annotated tag. 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 @@ -201,9 +212,9 @@ out of what the server said it could do with the first 'want' line. want-list = first-want *additional-want - shallow-line = PKT_LINE("shallow" SP obj-id) + shallow-line = PKT-LINE("shallow" SP obj-id) - depth-request = PKT_LINE("deepen" SP depth) + depth-request = PKT-LINE("deepen" SP depth) first-want = PKT-LINE("want" SP obj-id SP capability-list LF) additional-want = PKT-LINE("want" SP obj-id LF) @@ -220,17 +231,16 @@ obtained through ref discovery. 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 @@ -252,8 +262,10 @@ a positive depth, this step is skipped. ---- 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 @@ -326,7 +338,8 @@ during a prior round. This helps to ensure that at least one common 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. @@ -344,7 +357,7 @@ Then the server will start sending its packfile data. 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 @@ -360,7 +373,7 @@ A simple clone may look like this (with no 'have' lines): 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 @@ -412,7 +425,7 @@ entire packfile without multiplexing. 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 @@ -452,7 +465,9 @@ contain all the objects that the server will need to complete the new references. ---- - update-request = command-list [pack-file] + update-request = *shallow ( command-list | push-cert ) [pack-file] + + shallow = PKT-LINE("shallow" SP obj-id LF) command-list = PKT-LINE(command NUL capability-list LF) *PKT-LINE(command LF) @@ -466,12 +481,27 @@ references. old-id = obj-id new-id = obj-id + push-cert = PKT-LINE("push-cert" NUL capability-list LF) + PKT-LINE("certificate version 0.1" LF) + PKT-LINE("pusher" SP ident LF) + PKT-LINE("pushee" SP url LF) + PKT-LINE("nonce" SP nonce LF) + PKT-LINE(LF) + *PKT-LINE(command LF) + *PKT-LINE(gpg-signature-lines LF) + PKT-LINE("push-cert-end" LF) + pack-file = "PACK" 28*(OCTET) ---- If the receiving end does not support delete-refs, the sending end MUST NOT ask for delete command. +If the receiving end does not support push-cert, the sending end +MUST NOT send a push-cert command. When a push-cert command is +sent, command-list MUST NOT be sent; the commands recorded in the +push certificate is used instead. + The pack-file MUST NOT be sent if the only command used is 'delete'. A pack-file MUST be sent if either create or update command is used, @@ -486,6 +516,34 @@ was being processed (the obj-id is still the same as the old-id), and it will run any update hooks to make sure that the update is acceptable. If all of that is fine, the server will then update the references. +Push Certificate +---------------- + +A push certificate begins with a set of header lines. After the +header and an empty line, the protocol commands follow, one per +line. + +Currently, the following header fields are defined: + +`pusher` ident:: + Identify the GPG key in "Human Readable Name <email@address>" + format. + +`pushee` url:: + The repository URL (anonymized, if the URL contains + authentication material) the user who ran `git push` + intended to push into. + +`nonce` nonce:: + The 'nonce' string the receiving repository asked the + pushing user to include in the certificate, to prevent + replay attacks. + +The GPG signature lines are a detached signature for the contents +recorded in the push certificate before the signature block begins. +The detached signature is used to certify that the commands were +given by the pusher, who must be the signer. + Report Status ------------- |