Am 11.06.2015 um 20:59 schrieb Augie Fackler:
When developing server software, it's often helpful to save a
potentially-bogus pack for later analysis. This makes that trivial,
instead of painful.
When you develop server software, shouldn't you test drive the server
via the bare metal protocol anyway? That *is* painful, but unavoidable
because you must harden the server against any garbage that a
potentially malicous client could throw at it. Restricting yourself to a
well-behaved client such as fetch-pack is only half the deal.
That said, I do think that fetch-pack could learn a mode that makes it
easier to debug the normal behavior of a server (if such a mode is
missing currently).
What is the problem with the current fetch-pack implementation? Does it
remove a bogus packfile after download? Does it abort during download
when it detects a broken packfile? Does --keep not do what you need?
Instead of your approach (which forks off tee to dump a copy of the
packfile), would it not be simpler to add an option --debug-pack
(probably not the best name) that skips the cleanup step when a broken
packfile is detected and prints the name of the downloaded packfile?
diff --git a/fetch-pack.c b/fetch-pack.c
index a912935..fe6ba58 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -684,7 +684,7 @@ static int get_pack(struct fetch_pack_args *args,
const char *argv[22];
char keep_arg[256];
char hdr_arg[256];
- const char **av, *cmd_name;
+ const char **av, *cmd_name, *savepath;
int do_keep = args->keep_pack;
struct child_process cmd = CHILD_PROCESS_INIT;
int ret;
@@ -708,9 +708,8 @@ static int get_pack(struct fetch_pack_args *args,
cmd.argv = argv;
av = argv;
*hdr_arg = 0;
+ struct pack_header header;
if (!args->keep_pack && unpack_limit) {
- struct pack_header header;
-
if (read_pack_header(demux.out, &header))
die("protocol error: bad pack header");
snprintf(hdr_arg, sizeof(hdr_arg),
@@ -762,7 +761,44 @@ static int get_pack(struct fetch_pack_args *args,
*av++ = "--strict";
*av++ = NULL;
- cmd.in = demux.out;
+ savepath = getenv("GIT_SAVE_FETCHED_PACK_TO");
+ if (savepath) {
+ struct child_process cmd2 = CHILD_PROCESS_INIT;
+ const char *argv2[22];
+ int pipefds[2];
+ int e;
+ const char **av2;
+ cmd2.argv = argv2;
+ av2 = argv2;
+ *av2++ = "tee";
+ if (*hdr_arg) {
+ /* hdr_arg being nonempty means we already read the
+ * pack header from demux, so we need to drop a pack
+ * header in place for tee to append to, otherwise
+ * we'll end up with a broken pack on disk.
+ */
/*
* Write multi-line comments
* like this (/* on its own line)
*/
+ int fp;
+ struct sha1file *s;
+ fp = open(savepath, O_CREAT | O_TRUNC | O_WRONLY, 0666);
+ s = sha1fd_throughput(fp, savepath, NULL);
+ sha1write(s, &header, sizeof(header));
+ sha1flush(s);
Are you abusing sha1write() and sha1flush() to write a byte sequence to
a file? Is write_in_full() not sufficient?
+ close(fp);
+ /* -a is supported by both GNU and BSD tee */
+ *av2++ = "-a";
+ }
+ *av2++ = savepath;
+ *av2++ = NULL;
+ cmd2.in = demux.out;
+ e = pipe(pipefds);
+ if (e != 0)
+ die("couldn't make pipe to save pack");
start_command() can create the pipe for you. Just say cmd2.out = -1.
+ cmd2.out = pipefds[1];
+ cmd.in = pipefds[0];
+ if (start_command(&cmd2))
+ die("couldn't start tee to save a pack");
When you call start_command(), you must also call finish_command().
start_command() prints an error message for you; you don't have to do
that (the start_command() in the context below is a bad example).
+ } else
+ cmd.in = demux.out;
cmd.git_cmd = 1;
if (start_command(&cmd))
die("fetch-pack: unable to fork off %s", cmd_name);
diff --git a/t/t5551-http-fetch-smart.sh b/t/t5551-http-fetch-smart.sh
index 58207d8..bf4640d 100755
--- a/t/t5551-http-fetch-smart.sh
+++ b/t/t5551-http-fetch-smart.sh
@@ -82,11 +82,23 @@ test_expect_success 'fetch changes via http' '
test_cmp file clone/file
'
+test_expect_success 'fetch changes via http and save pack' '
+ echo content >>file &&
+ git commit -a -m two &&
+ git push public &&
+ GIT_SAVE_FETCHED_PACK_TO=saved.pack &&
+ export GIT_SAVE_FETCHED_PACK_TO &&
+ (cd clone && git pull) &&
This can be written as
(
cd clone &&
GIT_SAVE_FETCHED_PACK_TO=../saved.pack git pull
) &&
without 'export'.
+ git index-pack clone/saved.pack
+'
+
cat >exp <<EOF
GET /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1 200
POST /smart/repo.git/git-upload-pack HTTP/1.1 200
GET /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1 200
POST /smart/repo.git/git-upload-pack HTTP/1.1 200
+GET /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1 200
+POST /smart/repo.git/git-upload-pack HTTP/1.1 200
EOF
test_expect_success 'used upload-pack service' '
sed -e "
diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index bfdaf75..73f9e1c 100755
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -40,6 +40,15 @@ test_expect_success C_LOCALE_OUTPUT 'output from clone' '
test $(grep Clon output | wc -l) = 1
'
+test_expect_success 'clone allows saving a pack' '
+ rm -fr dst saved.pack &&
+ GIT_SAVE_FETCHED_PACK_TO=saved.pack &&
+ export GIT_SAVE_FETCHED_PACK_TO &&
+ git clone -n "file://$(pwd)/src" dst >output 2>&1 &&
Same here.
+ test -e saved.pack &&
+ git index-pack saved.pack
+'
+
test_expect_success 'clone does not keep pack' '
rm -fr dst &&
-- Hannes
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