Add git-write-blob.

A new command, git-write-blob, is introduced.  This registers
the contents of any file on the filesystem as a blob in the
object database and reports its SHA1 to the standard output.
To implement it, the patch promotes index_fd() from a static
function in update-cache.c to extern and moves it to a library
source, sha1_file.c.

This command is used to update git-merge-one-file-script so that
it does not smudge the work tree.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Makefile b/Makefile
index 86aca61..99b4753 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ PROG=   git-update-cache git-diff-files git-init-db git-write-tree \
        git-check-files git-ls-tree git-merge-base git-merge-cache \
        git-unpack-file git-export git-diff-cache git-convert-cache \
        git-http-pull git-rpush git-rpull git-rev-list git-mktag \
-       git-diff-tree-helper git-tar-tree git-local-pull
+       git-diff-tree-helper git-tar-tree git-local-pull git-write-blob
 
 all: $(PROG)
 
@@ -94,6 +94,7 @@ git-rev-list: rev-list.c
 git-mktag: mktag.c
 git-diff-tree-helper: diff-tree-helper.c
 git-tar-tree: tar-tree.c
+git-write-blob: write-blob.c
 
 git-http-pull: LIBS += -lcurl
 

diff --git a/cache.h b/cache.h
index 940ced0..94f22c2 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -116,6 +116,7 @@ extern int remove_entry_at(int pos);
 extern int remove_file_from_cache(char *path);
 extern int same_name(struct cache_entry *a, struct cache_entry *b);
 extern int cache_match_stat(struct cache_entry *ce, struct stat *st);
+extern int index_fd(unsigned char *sha1, int fd, struct stat *st);
 
 #define MTIME_CHANGED  0x0001
 #define CTIME_CHANGED  0x0002

diff --git a/sha1_file.c b/sha1_file.c
index ced0791..cb556ca 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -460,3 +460,54 @@ int has_sha1_file(const unsigned char *sha1)
                return 1;
        return 0;
 }
+
+int index_fd(unsigned char *sha1, int fd, struct stat *st)
+{
+       z_stream stream;
+       unsigned long size = st->st_size;
+       int max_out_bytes = size + 200;
+       void *out = xmalloc(max_out_bytes);
+       void *metadata = xmalloc(200);
+       int metadata_size;
+       void *in;
+       SHA_CTX c;
+
+       in = "";
+       if (size)
+               in = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
+       close(fd);
+       if (!out || (int)(long)in == -1)
+               return -1;
+
+       metadata_size = 1+sprintf(metadata, "blob %lu", size);
+
+       SHA1_Init(&c);
+       SHA1_Update(&c, metadata, metadata_size);
+       SHA1_Update(&c, in, size);
+       SHA1_Final(sha1, &c);
+
+       memset(&stream, 0, sizeof(stream));
+       deflateInit(&stream, Z_BEST_COMPRESSION);
+
+       /*
+        * ASCII size + nul byte
+        */     
+       stream.next_in = metadata;
+       stream.avail_in = metadata_size;
+       stream.next_out = out;
+       stream.avail_out = max_out_bytes;
+       while (deflate(&stream, 0) == Z_OK)
+               /* nothing */;
+
+       /*
+        * File content
+        */
+       stream.next_in = in;
+       stream.avail_in = size;
+       while (deflate(&stream, Z_FINISH) == Z_OK)
+               /*nothing */;
+
+       deflateEnd(&stream);
+       
+       return write_sha1_buffer(sha1, out, stream.total_out);
+}

diff --git a/update-cache.c b/update-cache.c
index d53c9b5..0401372 100644 (file)
--- a/update-cache.c
+++ b/update-cache.c
@@ -31,57 +31,6 @@ static inline long IS_ERR(const void *ptr)
        return (unsigned long)ptr > (unsigned long)-1000L;
 }
 
-static int index_fd(unsigned char *sha1, int fd, struct stat *st)
-{
-       z_stream stream;
-       unsigned long size = st->st_size;
-       int max_out_bytes = size + 200;
-       void *out = xmalloc(max_out_bytes);
-       void *metadata = xmalloc(200);
-       int metadata_size;
-       void *in;
-       SHA_CTX c;
-
-       in = "";
-       if (size)
-               in = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
-       close(fd);
-       if (!out || (int)(long)in == -1)
-               return -1;
-
-       metadata_size = 1+sprintf(metadata, "blob %lu", size);
-
-       SHA1_Init(&c);
-       SHA1_Update(&c, metadata, metadata_size);
-       SHA1_Update(&c, in, size);
-       SHA1_Final(sha1, &c);
-
-       memset(&stream, 0, sizeof(stream));
-       deflateInit(&stream, Z_BEST_COMPRESSION);
-
-       /*
-        * ASCII size + nul byte
-        */     
-       stream.next_in = metadata;
-       stream.avail_in = metadata_size;
-       stream.next_out = out;
-       stream.avail_out = max_out_bytes;
-       while (deflate(&stream, 0) == Z_OK)
-               /* nothing */;
-
-       /*
-        * File content
-        */
-       stream.next_in = in;
-       stream.avail_in = size;
-       while (deflate(&stream, Z_FINISH) == Z_OK)
-               /*nothing */;
-
-       deflateEnd(&stream);
-       
-       return write_sha1_buffer(sha1, out, stream.total_out);
-}
-
 /*
  * This only updates the "non-critical" parts of the directory
  * cache, ie the parts that aren't tracked by GIT, and only used

diff --git a/write-blob.c b/write-blob.c
new file mode 100644 (file)
index 0000000..8bfd576
--- /dev/null
+++ b/write-blob.c
@@ -0,0 +1,25 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ */
+#include "cache.h"
+
+int main(int argc, char **argv)
+{
+       int i;
+
+       for (i = 1 ; i < argc; i++) {
+               char *path = argv[i];
+               int fd;
+               struct stat st;
+               unsigned char sha1[20];
+               fd = open(path, O_RDONLY);
+               if (fd < 0 ||
+                   fstat(fd, &st) < 0 ||
+                   index_fd(sha1, fd, &st) < 0)
+                       die("Unable to add blob %s to database", path);
+               printf("%s\n", sha1_to_hex(sha1));
+       }
+       return 0;
+}