Merge branch 'sp/run-command'

* sp/run-command:
Use run_command within send-pack
Use run_command within receive-pack to invoke index-pack
Use run_command within merge-index
Use run_command for proxy connections
Use RUN_GIT_CMD to run push backends
Correct new compiler warnings in builtin-revert
Replace fork_with_pipe in bundle with run_command
Teach run-command to redirect stdout to /dev/null
Teach run-command about stdout redirection

diff --combined cache.h
index 3818e10f8c1a65cc4e4cf339bb5f7f324e8a7c4c,4f1066744c186695374008c1d3edad6d6dcac939..5396d3366dd5d802a4e3ce43d296957c94ddb028
--- 1/cache.h
--- 2/cache.h
+++ b/cache.h
@@@ -371,11 -371,9 +371,11 @@@ struct pack_window 
  extern struct packed_git {
        struct packed_git *next;
        struct pack_window *windows;
 -      uint32_t *index_base;
 +      const void *index_data;
        off_t index_size;
        off_t pack_size;
 +      time_t mtime;
 +      int index_version;
        int pack_fd;
        int pack_local;
        unsigned char sha1[20];
@@@ -413,7 -411,7 +413,7 @@@ extern int server_supports(const char *
  
  extern struct packed_git *parse_pack_index(unsigned char *sha1);
  extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 -                                              char *idx_path);
 +                                              const char *idx_path);
  
  extern void prepare_packed_git(void);
  extern void reprepare_packed_git(void);
@@@ -425,7 -423,7 +425,7 @@@ extern struct packed_git *find_sha1_pac
  extern void pack_report(void);
  extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
  extern void unuse_pack(struct pack_window **);
 -extern struct packed_git *add_packed_git(char *, int, int);
 +extern struct packed_git *add_packed_git(const char *, int, int);
  extern uint32_t num_packed_objects(const struct packed_git *p);
  extern int nth_packed_object_sha1(const struct packed_git *, uint32_t, unsigned char*);
  extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
@@@ -451,7 -449,7 +451,7 @@@ extern int check_repository_format_vers
  extern char git_default_email[MAX_GITNAME];
  extern char git_default_name[MAX_GITNAME];
  
- extern char *git_commit_encoding;
+ extern const char *git_commit_encoding;
  extern const char *git_log_output_encoding;
  
  extern int copy_fd(int ifd, int ofd);
@@@ -482,7 -480,6 +482,7 @@@ extern struct tag *alloc_tag_node(void)
  extern void alloc_report(void);
  
  /* trace.c */
 +extern int nfasprintf(char **str, const char *fmt, ...);
  extern int nfvasprintf(char **str, const char *fmt, va_list va);
  extern void trace_printf(const char *format, ...);
  extern void trace_argv_printf(const char **argv, int count, const char *format, ...);