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-rw-r--r--builtin/unpack-file.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/builtin/unpack-file.c b/builtin/unpack-file.c
new file mode 100644
index 000000000..608590ada
--- /dev/null
+++ b/builtin/unpack-file.c
@@ -0,0 +1,38 @@
+#include "cache.h"
+#include "blob.h"
+#include "exec_cmd.h"
+
+static char *create_temp_file(unsigned char *sha1)
+{
+ static char path[50];
+ void *buf;
+ enum object_type type;
+ unsigned long size;
+ int fd;
+
+ buf = read_sha1_file(sha1, &type, &size);
+ if (!buf || type != OBJ_BLOB)
+ die("unable to read blob object %s", sha1_to_hex(sha1));
+
+ strcpy(path, ".merge_file_XXXXXX");
+ fd = xmkstemp(path);
+ if (write_in_full(fd, buf, size) != size)
+ die_errno("unable to write temp-file");
+ close(fd);
+ return path;
+}
+
+int cmd_unpack_file(int argc, const char **argv, const char *prefix)
+{
+ unsigned char sha1[20];
+
+ if (argc != 2 || !strcmp(argv[1], "-h"))
+ usage("git unpack-file <sha1>");
+ if (get_sha1(argv[1], sha1))
+ die("Not a valid object name %s", argv[1]);
+
+ git_config(git_default_config, NULL);
+
+ puts(create_temp_file(sha1));
+ return 0;
+}