upload-archive: use start_command instead of fork

The POSIX-function fork is not supported on Windows. Use our
start_command API instead, respawning ourselves in a special
"writer" mode to follow the alternate code path.

Remove the NOT_MINGW-prereq for t5000, as git-archive --remote
now works.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin.h b/builtin.h
index 0e9da9083491eb3c18464b730f481cf74ee82430..f2357a94cf4ac9a7d03060df8e7b6507c968ea31 100644 (file)
--- a/builtin.h
+++ b/builtin.h
@@ -133,6 +133,7 @@ extern int cmd_update_index(int argc, const char **argv, const char *prefix);
 extern int cmd_update_ref(int argc, const char **argv, const char *prefix);
 extern int cmd_update_server_info(int argc, const char **argv, const char *prefix);
 extern int cmd_upload_archive(int argc, const char **argv, const char *prefix);
+extern int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix);
 extern int cmd_upload_tar(int argc, const char **argv, const char *prefix);
 extern int cmd_var(int argc, const char **argv, const char *prefix);
 extern int cmd_verify_tag(int argc, const char **argv, const char *prefix);

diff --git a/builtin/upload-archive.c b/builtin/upload-archive.c
index 2d0b38333eadef0a5c6501e5a3046ebc2afa048e..b928beb8ed51c9af9aa4f640e80443a5e059d505 100644 (file)
--- a/builtin/upload-archive.c
+++ b/builtin/upload-archive.c
@@ -6,6 +6,7 @@
 #include "archive.h"
 #include "pkt-line.h"
 #include "sideband.h"
+#include "run-command.h"
 
 static const char upload_archive_usage[] =
        "git upload-archive <repo>";
@@ -13,12 +14,9 @@ static const char upload_archive_usage[] =
 static const char deadchild[] =
 "git upload-archive: archiver died with error";
 
-static const char lostchild[] =
-"git upload-archive: archiver process was lost";
-
 #define MAX_ARGS (64)
 
-static int run_upload_archive(int argc, const char **argv, const char *prefix)
+int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix)
 {
        const char *sent_argv[MAX_ARGS];
        const char *arg_cmd = "argument ";
@@ -96,8 +94,8 @@ static ssize_t process_input(int child_fd, int band)
 
 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
 {
-       pid_t writer;
-       int fd1[2], fd2[2];
+       struct child_process writer = { argv };
+
        /*
         * Set up sideband subprocess.
         *
@@ -105,39 +103,24 @@ int cmd_upload_archive(int argc, const char **argv, const char *prefix)
         * multiplexed out to our fd#1.  If the child dies, we tell the other
         * end over channel #3.
         */
-       if (pipe(fd1) < 0 || pipe(fd2) < 0) {
-               int err = errno;
-               packet_write(1, "NACK pipe failed on the remote side\n");
-               die("upload-archive: %s", strerror(err));
-       }
-       writer = fork();
-       if (writer < 0) {
+       argv[0] = "upload-archive--writer";
+       writer.out = writer.err = -1;
+       writer.git_cmd = 1;
+       if (start_command(&writer)) {
                int err = errno;
-               packet_write(1, "NACK fork failed on the remote side\n");
+               packet_write(1, "NACK unable to spawn subprocess\n");
                die("upload-archive: %s", strerror(err));
        }
-       if (!writer) {
-               /* child - connect fd#1 and fd#2 to the pipe */
-               dup2(fd1[1], 1);
-               dup2(fd2[1], 2);
-               close(fd1[1]); close(fd2[1]);
-               close(fd1[0]); close(fd2[0]); /* we do not read from pipe */
-
-               exit(run_upload_archive(argc, argv, prefix));
-       }
 
-       /* parent - read from child, multiplex and send out to fd#1 */
-       close(fd1[1]); close(fd2[1]); /* we do not write to pipe */
        packet_write(1, "ACK\n");
        packet_flush(1);
 
        while (1) {
                struct pollfd pfd[2];
-               int status;
 
-               pfd[0].fd = fd1[0];
+               pfd[0].fd = writer.out;
                pfd[0].events = POLLIN;
-               pfd[1].fd = fd2[0];
+               pfd[1].fd = writer.err;
                pfd[1].events = POLLIN;
                if (poll(pfd, 2, -1) < 0) {
                        if (errno != EINTR) {
@@ -156,9 +139,7 @@ int cmd_upload_archive(int argc, const char **argv, const char *prefix)
                        if (process_input(pfd[0].fd, 1))
                                continue;
 
-               if (waitpid(writer, &status, 0) < 0)
-                       error_clnt("%s", lostchild);
-               else if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
+               if (finish_command(&writer))
                        error_clnt("%s", deadchild);
                packet_flush(1);
                break;

diff --git a/git.c b/git.c
index 8e34903a65c8775b19b993d3e9ddf47c23d5254e..250f4483eae3c8184e0f4bfc65c96cbb9e32756e 100644 (file)
--- a/git.c
+++ b/git.c
@@ -434,6 +434,7 @@ static void handle_internal_command(int argc, const char **argv)
                { "update-ref", cmd_update_ref, RUN_SETUP },
                { "update-server-info", cmd_update_server_info, RUN_SETUP },
                { "upload-archive", cmd_upload_archive },
+               { "upload-archive--writer", cmd_upload_archive_writer },
                { "var", cmd_var, RUN_SETUP_GENTLY },
                { "verify-pack", cmd_verify_pack },
                { "verify-tag", cmd_verify_tag, RUN_SETUP },

diff --git a/t/t5000-tar-tree.sh b/t/t5000-tar-tree.sh
index d9068981f8475c37d30e584bc6b795075a2f3063..889842e7fc0cf80f7e8b6016a508bffdb0399d32 100755 (executable)
--- a/t/t5000-tar-tree.sh
+++ b/t/t5000-tar-tree.sh
@@ -96,7 +96,7 @@ test_expect_success 'git archive with --output' \
     'git archive --output=b4.tar HEAD &&
     test_cmp b.tar b4.tar'
 
-test_expect_success NOT_MINGW 'git archive --remote' \
+test_expect_success 'git archive --remote' \
     'git archive --remote=. HEAD >b5.tar &&
     test_cmp b.tar b5.tar'
 
@@ -266,7 +266,7 @@ test_expect_success 'archive --list mentions user filter' '
        grep "^bar\$" output
 '
 
-test_expect_success NOT_MINGW 'archive --list shows only enabled remote filters' '
+test_expect_success 'archive --list shows only enabled remote filters' '
        git archive --list --remote=. >output &&
        ! grep "^tar\.foo\$" output &&
        grep "^bar\$" output
@@ -298,7 +298,7 @@ test_expect_success 'extension matching requires dot' '
        test_cmp b.tar config-implicittar.foo
 '
 
-test_expect_success NOT_MINGW 'only enabled filters are available remotely' '
+test_expect_success 'only enabled filters are available remotely' '
        test_must_fail git archive --remote=. --format=tar.foo HEAD \
                >remote.tar.foo &&
        git archive --remote=. --format=bar >remote.bar HEAD &&
@@ -341,12 +341,12 @@ test_expect_success GZIP,GUNZIP 'extract tgz file' '
        test_cmp b.tar j.tar
 '
 
-test_expect_success GZIP,NOT_MINGW 'remote tar.gz is allowed by default' '
+test_expect_success GZIP 'remote tar.gz is allowed by default' '
        git archive --remote=. --format=tar.gz HEAD >remote.tar.gz &&
        test_cmp j.tgz remote.tar.gz
 '
 
-test_expect_success GZIP,NOT_MINGW 'remote tar.gz can be disabled' '
+test_expect_success GZIP 'remote tar.gz can be disabled' '
        git config tar.tar.gz.remote false &&
        test_must_fail git archive --remote=. --format=tar.gz HEAD \
                >remote.tar.gz