Push passes to another commands, as described in
https://public-inbox.org/git/20171129032214.gb32...@sigill.intra.peff.net/
As it gets complicated to correctly track the data length, instead transfer
the data through parent process and cut the pipe as the specified length is
reached. Do it only when CONTENT_LENGTH is set, otherwise pass the input
directly to the forked commands.
Add tests for cases:
* CONTENT_LENGTH is set, script's stdin has more data, with all combinations
of variations: fetch or push, plain or compressed body, correct or truncated
input.
* CONTENT_LENGTH is specified to a value which does not fit into ssize_t.
Helped-by: Junio C Hamano <gits...@pobox.com>
Signed-off-by: Max Kirillov <m...@max630.net>
---
help.c | 1 +
http-backend.c | 32 ++++-
t/t5562-http-backend-content-length.sh | 155 +++++++++++++++++++++++++
t/t5562/invoke-with-content-length.pl | 37 ++++++
4 files changed, 223 insertions(+), 2 deletions(-)
create mode 100755 t/t5562-http-backend-content-length.sh
create mode 100755 t/t5562/invoke-with-content-length.pl
diff --git a/help.c b/help.c
index dd35fcc133..e469f5731c 100644
--- a/help.c
+++ b/help.c
@@ -609,6 +609,7 @@ int cmd_version(int argc, const char **argv, const char
*prefix)
else
printf("no commit associated with this build\n");
printf("sizeof-long: %d\n", (int)sizeof(long));
+ printf("sizeof-size_t: %d\n", (int)sizeof(size_t));
/* NEEDSWORK: also save and output GIT-BUILD_OPTIONS? */
}
return 0;
diff --git a/http-backend.c b/http-backend.c
index d0b6cb1b09..e88d29f62b 100644
--- a/http-backend.c
+++ b/http-backend.c
@@ -373,6 +373,8 @@ static void inflate_request(const char *prog_name, int out,
int buffer_input, ss
unsigned char in_buf[8192];
unsigned char out_buf[8192];
unsigned long cnt = 0;
+ int req_len_defined = req_len >= 0;
+ size_t req_remaining_len = req_len;
memset(&stream, 0, sizeof(stream));
git_inflate_init_gzip_only(&stream);
@@ -387,8 +389,15 @@ static void inflate_request(const char *prog_name, int
out, int buffer_input, ss
n = read_request(0, &full_request, req_len);
stream.next_in = full_request;
} else {
- n = xread(0, in_buf, sizeof(in_buf));
+ ssize_t buffer_len;
+ if (req_len_defined && req_remaining_len <=
sizeof(in_buf))
+ buffer_len = req_remaining_len;
+ else
+ buffer_len = sizeof(in_buf);
+ n = xread(0, in_buf, buffer_len);
stream.next_in = in_buf;
+ if (req_len_defined && n > 0)
+ req_remaining_len -= n;
}
if (n <= 0)
@@ -431,6 +440,23 @@ static void copy_request(const char *prog_name, int out,
ssize_t req_len)
free(buf);
}
+static void pipe_fixed_length(const char *prog_name, int out, size_t req_len)
+{
+ unsigned char buf[8192];
+ size_t remaining_len = req_len;
+
+ while (remaining_len > 0) {
+ size_t chunk_length = remaining_len > sizeof(buf) ? sizeof(buf)
: remaining_len;
+ ssize_t n = xread(0, buf, chunk_length);
+ if (n < 0)
+ die_errno("Reading request failed");
+ write_to_child(out, buf, n, prog_name);
+ remaining_len -= n;
+ }
+
+ close(out);
+}
+
static void run_service(const char **argv, int buffer_input)
{
const char *encoding = getenv("HTTP_CONTENT_ENCODING");
@@ -457,7 +483,7 @@ static void run_service(const char **argv, int buffer_input)
"GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
cld.argv = argv;
- if (buffer_input || gzipped_request)
+ if (buffer_input || gzipped_request || req_len >= 0)
cld.in = -1;
cld.git_cmd = 1;
if (start_command(&cld))
@@ -468,6 +494,8 @@ static void run_service(const char **argv, int buffer_input)
inflate_request(argv[0], cld.in, buffer_input, req_len);
else if (buffer_input)
copy_request(argv[0], cld.in, req_len);
+ else if (req_len >= 0)
+ pipe_fixed_length(argv[0], cld.in, req_len);
else
close(0);
diff --git a/t/t5562-http-backend-content-length.sh
b/t/t5562-http-backend-content-length.sh
new file mode 100755
index 0000000000..057dcb85d6
--- /dev/null
+++ b/t/t5562-http-backend-content-length.sh
@@ -0,0 +1,155 @@
+#!/bin/sh
+
+test_description='test git-http-backend respects CONTENT_LENGTH'
+. ./test-lib.sh
+
+test_lazy_prereq GZIP 'gzip --version'
+
+verify_http_result() {
+ # some fatal errors still produce status 200
+ # so check if there is the error message
+ if grep 'fatal:' act.err
+ then
+ return 1
+ fi
+
+ if ! grep "Status" act.out >act
+ then
+ printf "Status: 200 OK\r\n" >act
+ fi
+ printf "Status: $1\r\n" >exp &&
+ test_cmp exp act
+}
+
+test_http_env() {
+ handler_type="$1"
+ request_body="$2"
+ shift
+ env \
+ CONTENT_TYPE="application/x-git-$handler_type-pack-request" \
+ QUERY_STRING="/repo.git/git-$handler_type-pack" \
+ PATH_TRANSLATED="$PWD/.git/git-$handler_type-pack" \
+ GIT_HTTP_EXPORT_ALL=TRUE \
+ REQUEST_METHOD=POST \
+ "$TEST_DIRECTORY"/t5562/invoke-with-content-length.pl \
+ "$request_body" git http-backend >act.out 2>act.err
+}
+
+ssize_b100dots() {
+ # hardcoded ((size_t) SSIZE_MAX) + 1
+ case "$(build_option sizeof-size_t)" in
+ 8) echo 9223372036854775808;;
+ 4) echo 2147483648;;
+ *) die "Unexpected ssize_t size: $(build_option sizeof-size_t)";;
+ esac
+}
+
+test_expect_success 'setup' '
+ export HTTP_CONTENT_ENCODING="identity" &&
+ git config http.receivepack true &&
+ test_commit c0 &&
+ test_commit c1 &&
+ hash_head=$(git rev-parse HEAD) &&
+ hash_prev=$(git rev-parse HEAD~1) &&
+ printf "want %s" "$hash_head" | packetize >fetch_body &&
+ printf 0000 >>fetch_body &&
+ printf "have %s" "$hash_prev" | packetize >>fetch_body &&
+ printf done | packetize >>fetch_body &&
+ test_copy_bytes 10 <fetch_body >fetch_body.trunc &&
+ hash_next=$(git commit-tree -p HEAD -m next HEAD^{tree}) &&
+ printf "%s %s refs/heads/newbranch\\0report-status\\n" "$_z40"
"$hash_next" | packetize >push_body &&
+ printf 0000 >>push_body &&
+ echo "$hash_next" | git pack-objects --stdout >>push_body &&
+ test_copy_bytes 10 <push_body >push_body.trunc &&
+ : >empty_body
+'
+
+test_expect_success GZIP 'setup, compression related' '
+ gzip -c fetch_body >fetch_body.gz &&
+ test_copy_bytes 10 <fetch_body.gz >fetch_body.gz.trunc &&
+ gzip -c push_body >push_body.gz &&
+ test_copy_bytes 10 <push_body.gz >push_body.gz.trunc
+'
+
+test_expect_success 'fetch plain' '
+ test_http_env upload fetch_body &&
+ verify_http_result "200 OK"
+'
+
+test_expect_success 'fetch plain truncated' '
+ test_http_env upload fetch_body.trunc &&
+ ! verify_http_result "200 OK"
+'
+
+test_expect_success 'fetch plain empty' '
+ test_http_env upload empty_body &&
+ ! verify_http_result "200 OK"
+'
+
+test_expect_success GZIP 'fetch gzipped' '
+ test_env HTTP_CONTENT_ENCODING="gzip" test_http_env upload
fetch_body.gz &&
+ verify_http_result "200 OK"
+'
+
+test_expect_success GZIP 'fetch gzipped truncated' '
+ test_env HTTP_CONTENT_ENCODING="gzip" test_http_env upload
fetch_body.gz.trunc &&
+ ! verify_http_result "200 OK"
+'
+
+test_expect_success GZIP 'fetch gzipped empty' '
+ test_env HTTP_CONTENT_ENCODING="gzip" test_http_env upload empty_body &&
+ ! verify_http_result "200 OK"
+'
+
+test_expect_success GZIP 'push plain' '
+ test_when_finished "git branch -D newbranch" &&
+ test_http_env receive push_body &&
+ verify_http_result "200 OK" &&
+ git rev-parse newbranch >act.head &&
+ echo "$hash_next" >exp.head &&
+ test_cmp act.head exp.head
+'
+
+test_expect_success 'push plain truncated' '
+ test_http_env receive push_body.trunc &&
+ ! verify_http_result "200 OK"
+'
+
+test_expect_success 'push plain empty' '
+ test_http_env receive empty_body &&
+ ! verify_http_result "200 OK"
+'
+
+test_expect_success GZIP 'push gzipped' '
+ test_when_finished "git branch -D newbranch" &&
+ test_env HTTP_CONTENT_ENCODING="gzip" test_http_env receive
push_body.gz &&
+ verify_http_result "200 OK" &&
+ git rev-parse newbranch >act.head &&
+ echo "$hash_next" >exp.head &&
+ test_cmp act.head exp.head
+'
+
+test_expect_success GZIP 'push gzipped truncated' '
+ test_env HTTP_CONTENT_ENCODING="gzip" test_http_env receive
push_body.gz.trunc &&
+ ! verify_http_result "200 OK"
+'
+
+test_expect_success GZIP 'push gzipped empty' '
+ test_env HTTP_CONTENT_ENCODING="gzip" test_http_env receive empty_body
&&
+ ! verify_http_result "200 OK"
+'
+
+test_expect_success 'CONTENT_LENGTH overflow ssite_t' '
+ NOT_FIT_IN_SSIZE=$(ssize_b100dots) &&
+ env \
+ CONTENT_TYPE=application/x-git-upload-pack-request \
+ QUERY_STRING=/repo.git/git-upload-pack \
+ PATH_TRANSLATED="$PWD"/.git/git-upload-pack \
+ GIT_HTTP_EXPORT_ALL=TRUE \
+ REQUEST_METHOD=POST \
+ CONTENT_LENGTH="$NOT_FIT_IN_SSIZE" \
+ git http-backend </dev/zero >/dev/null 2>err &&
+ grep "fatal:.*CONTENT_LENGTH" err
+'
+
+test_done
diff --git a/t/t5562/invoke-with-content-length.pl
b/t/t5562/invoke-with-content-length.pl
new file mode 100755
index 0000000000..6c2aae7692
--- /dev/null
+++ b/t/t5562/invoke-with-content-length.pl
@@ -0,0 +1,37 @@
+#!/usr/bin/perl
+use 5.008;
+use strict;
+use warnings;
+
+my $body_filename = $ARGV[0];
+my @command = @ARGV[1 .. $#ARGV];
+
+# read data
+my $body_size = -s $body_filename;
+$ENV{"CONTENT_LENGTH"} = $body_size;
+open(my $body_fh, "<", $body_filename) or die "Cannot open $body_filename: $!";
+my $body_data;
+defined read($body_fh, $body_data, $body_size) or die "Cannot read
$body_filename: $!";
+close($body_fh);
+
+my $exited = 0;
+$SIG{"CHLD"} = sub {
+ $exited = 1;
+};
+
+# write data
+my $pid = open(my $out, "|-", @command);
+{
+ # disable buffering at $out
+ my $old_selected = select;
+ select $out;
+ $| = 1;
+ select $old_selected;
+}
+print $out $body_data or die "Cannot write data: $!";
+
+sleep 60; # is interrupted by SIGCHLD
+if (!$exited) {
+ close($out);
+ die "Command did not exit after reading whole body";
+}
--
2.17.0.1185.g782057d875
