tPrint error when trying to extract an unknown snapshot id - dedup - deduplicating backup program
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       ---
 (DIR) commit d3ec97d4abc70c1e5c87f5ff5f7b4800fdf89bcb
 (DIR) parent 6fa8f387de8c032029f8a3e9994d5ac5be5c7670
 (HTM) Author: sin <sin@2f30.org>
       Date:   Mon, 25 Feb 2019 11:46:30 +0000
       
       Print error when trying to extract an unknown snapshot id
       
       Diffstat:
         M dedup.c                             |       5 +++++
       
       1 file changed, 5 insertions(+), 0 deletions(-)
       ---
 (DIR) diff --git a/dedup.c b/dedup.c
       t@@ -28,6 +28,7 @@ enum {
        struct extract_args {
                uint8_t *md;
                int fd;
       +        int ret;
        };
        
        static struct snapshot_hdr snaphdr;
       t@@ -305,6 +306,7 @@ extract(struct snapshot *snap, void *arg)
                }
                free_buf(buf[1]);
                free_buf(buf[0]);
       +        args->ret = 0;
                return WALK_STOP;
        }
        
       t@@ -601,7 +603,10 @@ main(int argc, char *argv[])
                        str2bin(id, md);
                        args.md = md;
                        args.fd = fd;
       +                args.ret = -1;
                        walk_snap(extract, &args);
       +                if (args.ret != 0)
       +                        errx(1, "unknown snapshot: %s", id);
                } else {
                        dedup(fd, msg);
                }