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author | Junio C Hamano <gitster@pobox.com> | 2017-03-24 12:57:52 -0700 |
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committer | Junio C Hamano <gitster@pobox.com> | 2017-03-24 12:57:52 -0700 |
commit | f4d3af185988ad45ebc0a6dead32222cad2c03a6 (patch) | |
tree | cdfbacf6e120e2eddfa417ad203a40e8dcafc3ae | |
parent | mailmap: use Michael J Gruber's new address (diff) | |
parent | send-pack: report signal death of pack-objects (diff) | |
download | tgif-f4d3af185988ad45ebc0a6dead32222cad2c03a6.tar.xz |
Merge branch 'jk/push-deadlock-regression-fix' into maint
"git push" had a handful of codepaths that could lead to a deadlock
when unexpected error happened, which has been fixed.
* jk/push-deadlock-regression-fix:
send-pack: report signal death of pack-objects
send-pack: read "unpack" status even on pack-objects failure
send-pack: improve unpack-status error messages
send-pack: use skip_prefix for parsing unpack status
send-pack: extract parsing of "unpack" response
receive-pack: fix deadlock when we cannot create tmpdir
-rw-r--r-- | builtin/receive-pack.c | 5 | ||||
-rw-r--r-- | send-pack.c | 46 |
2 files changed, 40 insertions, 11 deletions
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c index 1dbb8a0692..8672825e2e 100644 --- a/builtin/receive-pack.c +++ b/builtin/receive-pack.c @@ -1664,8 +1664,11 @@ static const char *unpack(int err_fd, struct shallow_info *si) } tmp_objdir = tmp_objdir_create(); - if (!tmp_objdir) + if (!tmp_objdir) { + if (err_fd > 0) + close(err_fd); return "unable to create temporary object directory"; + } child.env = tmp_objdir_env(tmp_objdir); /* diff --git a/send-pack.c b/send-pack.c index 6195b43e9a..d2d2a49a02 100644 --- a/send-pack.c +++ b/send-pack.c @@ -72,6 +72,7 @@ static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, stru struct child_process po = CHILD_PROCESS_INIT; FILE *po_in; int i; + int rc; i = 4; if (args->use_thin_pack) @@ -125,27 +126,44 @@ static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, stru po.out = -1; } - if (finish_command(&po)) + rc = finish_command(&po); + if (rc) { + /* + * For a normal non-zero exit, we assume pack-objects wrote + * something useful to stderr. For death by signal, though, + * we should mention it to the user. The exception is SIGPIPE + * (141), because that's a normal occurence if the remote end + * hangs up (and we'll report that by trying to read the unpack + * status). + */ + if (rc > 128 && rc != 141) + error("pack-objects died of signal %d", rc - 128); return -1; + } + return 0; +} + +static int receive_unpack_status(int in) +{ + const char *line = packet_read_line(in, NULL); + if (!skip_prefix(line, "unpack ", &line)) + return error(_("unable to parse remote unpack status: %s"), line); + if (strcmp(line, "ok")) + return error(_("remote unpack failed: %s"), line); return 0; } static int receive_status(int in, struct ref *refs) { struct ref *hint; - int ret = 0; - char *line = packet_read_line(in, NULL); - if (!starts_with(line, "unpack ")) - return error("did not receive remote status"); - if (strcmp(line, "unpack ok")) { - error("unpack failed: %s", line + 7); - ret = -1; - } + int ret; + hint = NULL; + ret = receive_unpack_status(in); while (1) { char *refname; char *msg; - line = packet_read_line(in, NULL); + char *line = packet_read_line(in, NULL); if (!line) break; if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) { @@ -557,6 +575,14 @@ int send_pack(struct send_pack_args *args, close(out); if (git_connection_is_socket(conn)) shutdown(fd[0], SHUT_WR); + + /* + * Do not even bother with the return value; we know we + * are failing, and just want the error() side effects. + */ + if (status_report) + receive_unpack_status(in); + if (use_sideband) { close(demux.out); finish_async(&demux); |