Vincent Batts 7795b1c697 graph: exported images times matching creation ...

the image export, that is used in `docker save` previous has just had
the layers times (atimes, mtimes) be when the save was done.
```bash
vbatts@valse ~ (master) $ docker save busybox | tar tv
drwxr-xr-x 0/0               0 2015-09-03 22:22 6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea/
-rw-r--r-- 0/0               3 2015-09-03 22:22 6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea/VERSION
-rw-r--r-- 0/0            1405 2015-09-03 22:22 6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea/json
-rw-r--r-- 0/0         2643968 2015-09-03 22:22 6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea/layer.tar
drwxr-xr-x 0/0               0 2015-09-03 22:22 8c2e06607696bd4afb3d03b687e361cc43cf8ec1a4a725bc96e39f05ba97dd55/
-rw-r--r-- 0/0               3 2015-09-03 22:22 8c2e06607696bd4afb3d03b687e361cc43cf8ec1a4a725bc96e39f05ba97dd55/VERSION
-rw-r--r-- 0/0            1346 2015-09-03 22:22 8c2e06607696bd4afb3d03b687e361cc43cf8ec1a4a725bc96e39f05ba97dd55/json
-rw-r--r-- 0/0            1024 2015-09-03 22:22 8c2e06607696bd4afb3d03b687e361cc43cf8ec1a4a725bc96e39f05ba97dd55/layer.tar
drwxr-xr-x 0/0               0 2015-09-03 22:22 cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff/
-rw-r--r-- 0/0               3 2015-09-03 22:22 cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff/VERSION
-rw-r--r-- 0/0            1181 2015-09-03 22:22 cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff/json
-rw-r--r-- 0/0            1024 2015-09-03 22:22 cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff/layer.tar
-rw-r--r-- 0/0              90 2015-09-03 22:22 repositories
```

With this change, the layer's directory and artifact will have times
matching the image layer's created time. The "repositories" file is set
to epoch.
```bash
vbatts@valse ~ (master) $ docker save busybox | tar tv
drwxr-xr-x 0/0               0 2015-04-17 18:01 6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea/
-rw-r--r-- 0/0               3 2015-04-17 18:01 6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea/VERSION
-rw-r--r-- 0/0            1405 2015-04-17 18:01 6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea/json
-rw-r--r-- 0/0         2643968 2015-04-17 18:01 6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea/layer.tar
drwxr-xr-x 0/0               0 2015-04-17 18:01 8c2e06607696bd4afb3d03b687e361cc43cf8ec1a4a725bc96e39f05ba97dd55/
-rw-r--r-- 0/0               3 2015-04-17 18:01 8c2e06607696bd4afb3d03b687e361cc43cf8ec1a4a725bc96e39f05ba97dd55/VERSION
-rw-r--r-- 0/0            1346 2015-04-17 18:01 8c2e06607696bd4afb3d03b687e361cc43cf8ec1a4a725bc96e39f05ba97dd55/json
-rw-r--r-- 0/0            1024 2015-04-17 18:01 8c2e06607696bd4afb3d03b687e361cc43cf8ec1a4a725bc96e39f05ba97dd55/layer.tar
drwxr-xr-x 0/0               0 2015-04-17 18:01 cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff/
-rw-r--r-- 0/0               3 2015-04-17 18:01 cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff/VERSION
-rw-r--r-- 0/0            1181 2015-04-17 18:01 cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff/json
-rw-r--r-- 0/0            1024 2015-04-17 18:01 cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff/layer.tar
-rw-r--r-- 0/0              90 1969-12-31 19:00 repositories
```

Side effect of this is that the tar stream from `docker save` is now
more deterministic.
```bash
vbatts@valse ~ (master) $ docker save busybox | sha1sum
baf03e30ef79ca4d9c5e512d3a1b873880f404ca  -
vbatts@valse ~ (master) $ docker save busybox | sha1sum
baf03e30ef79ca4d9c5e512d3a1b873880f404ca  -
vbatts@valse ~ (master) $ docker save busybox | sha1sum
baf03e30ef79ca4d9c5e512d3a1b873880f404ca  -
vbatts@valse ~ (master) $ docker save busybox | sha1sum
baf03e30ef79ca4d9c5e512d3a1b873880f404ca  -
```

Signed-off-by: Vincent Batts <vbatts@redhat.com>

2015-09-03 22:19:10 -04:00

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