Make send/receive-pack be closer to doing something interesting

diff --git a/Makefile b/Makefile
index 792b014..94f5d9e 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@
 # BREAK YOUR LOCAL DIFFS! show-diff and anything using it will likely randomly
 # break unless your underlying filesystem supports those sub-second times
 # (my ext3 doesn't).
-COPTS=-O2
+COPTS=
 CFLAGS=-g $(COPTS) -Wall
 
 prefix=$(HOME)
@@ -46,9 +46,10 @@ install: $(PROG) $(SCRIPTS)
 
 LIB_OBJS=read-cache.o sha1_file.o usage.o object.o commit.o tree.o blob.o \
         tag.o date.o index.o diff-delta.o patch-delta.o entry.o \
-        epoch.o refs.o csum-file.o verify_pack.o
+        epoch.o refs.o csum-file.o verify_pack.o pkt-line.o
 LIB_FILE=libgit.a
-LIB_H=cache.h object.h blob.h tree.h commit.h tag.h delta.h epoch.h csum-file.h pack.h
+LIB_H=cache.h object.h blob.h tree.h commit.h tag.h delta.h epoch.h csum-file.h \
+       pack.h pkt-line.h
 
 LIB_H += strbuf.h
 LIB_OBJS += strbuf.o

diff --git a/pkt-line.c b/pkt-line.c
new file mode 100644 (file)
index 0000000..6947304
--- /dev/null
+++ b/pkt-line.c
@@ -0,0 +1,117 @@
+#include "cache.h"
+#include "pkt-line.h"
+
+/*
+ * Write a packetized stream, where each line is preceded by
+ * its length (including the header) as a 4-byte hex number.
+ * A length of 'zero' means end of stream (and a length of 1-3
+ * would be an error). 
+ *
+ * This is all pretty stupid, but we use this packetized line
+ * format to make a streaming format possible without ever
+ * over-running the read buffers. That way we'll never read
+ * into what might be the pack data (which should go to another
+ * process entirely).
+ *
+ * The writing side could use stdio, but since the reading
+ * side can't, we stay with pure read/write interfaces.
+ */
+static void safe_write(int fd, const void *buf, unsigned n)
+{
+       while (n) {
+               int ret = write(fd, buf, n);
+               if (ret > 0) {
+                       buf += ret;
+                       n -= ret;
+                       continue;
+               }
+               if (!ret)
+                       die("write error (disk full?)");
+               if (errno == EAGAIN || errno == EINTR)
+                       continue;
+               die("write error (%s)", strerror(errno));
+       }
+}
+
+/*
+ * If we buffered things up above (we don't, but we should),
+ * we'd flush it here
+ */
+void packet_flush(int fd)
+{
+       safe_write(fd, "0000", 4);
+}
+
+#define hex(a) (hexchar[(a) & 15])
+void packet_write(int fd, const char *fmt, ...)
+{
+       static char buffer[1000];
+       static char hexchar[] = "0123456789abcdef";
+       va_list args;
+       unsigned n;
+
+       va_start(args, fmt);
+       n = vsnprintf(buffer + 4, sizeof(buffer) - 4, fmt, args);
+       va_end(args);
+       if (n >= sizeof(buffer)-4)
+               die("protocol error: impossibly long line");
+       n += 4;
+       buffer[0] = hex(n >> 12);
+       buffer[1] = hex(n >> 8);
+       buffer[2] = hex(n >> 4);
+       buffer[3] = hex(n);
+       safe_write(fd, buffer, n);
+}
+
+static void safe_read(int fd, void *buffer, unsigned size)
+{
+       int n = 0;
+
+       while (n < size) {
+               int ret = read(fd, buffer + n, size - n);
+               if (ret < 0) {
+                       if (errno == EINTR || errno == EAGAIN)
+                               continue;
+                       die("read error (%s)", strerror(errno));
+               }
+               if (!ret)
+                       die("unexpected EOF");
+               n += ret;
+       }
+}
+
+int packet_read_line(int fd, char *buffer, unsigned size)
+{
+       int n;
+       unsigned len;
+       char linelen[4];
+
+       safe_read(fd, linelen, 4);
+
+       len = 0;
+       for (n = 0; n < 4; n++) {
+               unsigned char c = linelen[n];
+               len <<= 4;
+               if (c >= '0' && c <= '9') {
+                       len += c - '0';
+                       continue;
+               }
+               if (c >= 'a' && c <= 'f') {
+                       len += c - 'a' + 10;
+                       continue;
+               }
+               if (c >= 'A' && c <= 'F') {
+                       len += c - 'A' + 10;
+                       continue;
+               }
+               die("protocol error: bad line length character");
+       }
+       if (!len)
+               return 0;
+       len -= 4;
+       if (len >= size)
+               die("protocol error: bad line length %d", len);
+       safe_read(fd, buffer, len);
+       buffer[len] = 0;
+       return len;
+}

diff --git a/pkt-line.h b/pkt-line.h
new file mode 100644 (file)
index 0000000..b0b4f6d
--- /dev/null
+++ b/pkt-line.h
@@ -0,0 +1,12 @@
+#ifndef PKTLINE_H
+#define PKTLINE_H
+
+/*
+ * Silly packetized line writing interface
+ */
+void packet_flush(int fd);
+void packet_write(int fd, const char *fmt, ...);
+
+int packet_read_line(int fd, char *buffer, unsigned size);
+
+#endif

diff --git a/receive-pack.c b/receive-pack.c
index 6013883..13d0b66 100644 (file)
--- a/receive-pack.c
+++ b/receive-pack.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "pkt-line.h"
 #include <sys/wait.h>
 
 static const char receive_pack_usage[] = "git-receive-pack [--unpack=executable] <git-dir> [heads]";
@@ -26,61 +27,9 @@ static int path_match(const char *path, int nr, char **match)
        return 0;
 }
 
-static void safe_write(int fd, const void *buf, unsigned n)
-{
-       while (n) {
-               int ret = write(fd, buf, n);
-               if (ret > 0) {
-                       buf += ret;
-                       n -= ret;
-                       continue;
-               }
-               if (!ret)
-                       die("write error (disk full?)");
-               if (errno == EAGAIN || errno == EINTR)
-                       continue;
-               die("write error (%s)", strerror(errno));
-       }
-}
-
-/*
- * If we buffered things up above (we don't, but we should),
- * we'd flush it here
- */
-static void flush_safe(int fd)
-{
-}
-
-/*
- * Write a packetized stream, where each line is preceded by
- * its length (including the header) as a 4-byte hex number.
- * A length of 'zero' means end of stream (and a length of 1-3
- * would be an error). 
- */
-#define hex(a) (hexchar[(a) & 15])
-static void packet_write(const char *fmt, ...)
-{
-       static char buffer[1000];
-       static char hexchar[] = "0123456789abcdef";
-       va_list args;
-       unsigned n;
-
-       va_start(args, fmt);
-       n = vsnprintf(buffer + 4, sizeof(buffer) - 4, fmt, args);
-       va_end(args);
-       if (n >= sizeof(buffer)-4)
-               die("protocol error: impossibly long line");
-       n += 4;
-       buffer[0] = hex(n >> 12);
-       buffer[1] = hex(n >> 8);
-       buffer[2] = hex(n >> 4);
-       buffer[3] = hex(n);
-       safe_write(1, buffer, n);
-}
-
 static void show_ref(const char *path, unsigned char *sha1)
 {
-       packet_write("%s %s\n", sha1_to_hex(sha1), path);
+       packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
 }
 
 static int read_ref(const char *path, unsigned char *sha1)
@@ -137,66 +86,6 @@ static void write_head_info(const char *base, int nr, char **match)
        }
 }
 
-/*
- * This is all pretty stupid, but we use this packetized line
- * format to make a streaming format possible without ever
- * over-running the read buffers. That way we'll never read
- * into what might be the pack data (which should go to another
- * process entirely).
- *
- * The writing side could use stdio, but since the reading
- * side can't, we stay with pure read/write interfaces.
- */
-static void safe_read(int fd, void *buffer, unsigned size)
-{
-       int n = 0;
-
-       while (n < size) {
-               int ret = read(0, buffer + n, size - n);
-               if (ret < 0) {
-                       if (errno == EINTR || errno == EAGAIN)
-                               continue;
-                       die("read error (%s)", strerror(errno));
-               }
-               if (!ret)
-                       die("unexpected EOF");
-               n += ret;
-       }
-}
-
-static int safe_read_line(char *buffer, unsigned size)
-{
-       int n, len;
-
-       safe_read(0, buffer, 4);
-
-       len = 0;
-       for (n = 0; n < 4; n++) {
-               unsigned char c = buffer[n];
-               len <<= 4;
-               if (c >= '0' && c <= '9') {
-                       len += c - '0';
-                       continue;
-               }
-               if (c >= 'a' && c <= 'f') {
-                       len += c - 'a' + 10;
-                       continue;
-               }
-               if (c >= 'A' && c <= 'F') {
-                       len += c - 'A' + 10;
-                       continue;
-               }
-               die("protocol error: bad line length character");
-       }
-       if (!len)
-               return 0;
-       if (len < 4 || len >= size)
-               die("protocol error: bad line length %d", len);
-       safe_read(0, buffer + 4, len - 4);
-       buffer[len] = 0;
-       return len;
-}
-
 struct line {
        struct line *next;
        char data[0];
@@ -213,7 +102,7 @@ static void execute_commands(void)
        struct line *line = commands;
 
        while (line) {
-               printf("%s", line->data);
+               fprintf(stderr, "%s", line->data);
                line = line->next;
        }
 }
@@ -223,7 +112,7 @@ static void read_head_info(void)
        struct line **p = &commands;
        for (;;) {
                static char line[1000];
-               int len = safe_read_line(line, sizeof(line));
+               int len = packet_read_line(0, line, sizeof(line));
                struct line *n;
                if (!len)
                        break;
@@ -242,8 +131,8 @@ static void unpack(void)
        if (pid < 0)
                die("unpack fork failed");
        if (!pid) {
-               char *const envp[] = { "GIT_DIR=.", NULL };
-               execle(unpacker, unpacker, NULL, envp);
+               setenv("GIT_DIR", ".", 1);
+               execlp(unpacker, unpacker, NULL);
                die("unpack execute failed");
        }
 
@@ -311,8 +200,7 @@ int main(int argc, char **argv)
        write_head_info("refs/", nr_heads, heads);
 
        /* EOF */
-       safe_write(1, "0000", 4);
-       flush_safe(1);
+       packet_flush(1);
 
        read_head_info();
        unpack();

diff --git a/send-pack.c b/send-pack.c
index af57d40..99cb84b 100644 (file)
--- a/send-pack.c
+++ b/send-pack.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "pkt-line.h"
 
 static const char send_pack_usage[] = "git-send-pack [--exec=other] destination [heads]*";
 
@@ -8,13 +9,16 @@ static int send_pack(int in, int out)
 {
        for (;;) {
                static char buffer[1000];
-               int ret = read(in, buffer, sizeof(buffer));
-               if (ret > 0) {
-                       write(1, buffer, ret);
+               int len;
+
+               len = packet_read_line(in, buffer, sizeof(buffer));
+               if (len > 0) {
+                       write(2, buffer, len);
                        continue;
                }
                break;
        }
+       packet_flush(out);
        close(out);
        return 0;
 }
@@ -77,7 +81,7 @@ static int setup_connection(int fd[2], char *url, char **heads)
                if (host)
                        execlp("ssh", "ssh", host, command, NULL);
                else
-                       execlp(host, command, NULL);
+                       execlp("sh", "sh", "-c", command, NULL);
                die("exec failed");
        }               
        fd[0] = pipefd[0][0];