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Updating README

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Alex Yatskov 2015-07-06 15:59:37 +09:00
parent a06990b5bd
commit c811f7fb02
1 changed files with 22 additions and 19 deletions
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README.md
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@ -75,7 +75,8 @@ empty directory is a valid empty version database and mount points should by alw
directories (`db` for the database and `mp` for the mount point). directories (`db` for the database and `mp` for the mount point).
``` ```
alex@wintermute ~/vfs> mkdir db mp; ls $ mkdir db mp
$ ls
db/ mp/ db/ mp/
``` ```
@ -83,30 +84,27 @@ Now let's mount the empty database directory `db` onto our mount point `mp` (not
group or `root` in order for this to work): group or `root` in order for this to work):
``` ```
alex@wintermute ~/vfs> vfs db mp $ vfs db mp
``` ```
Using a new terminal window, let's create some files and directories: Using a new terminal window, let's create some files and directories:
``` ```
alex@wintermute ~/vfs> echo hello > mp/greeting.txt; mkdir mp/pizza; touch mp/pizza/pepperoni mp/pizza/cheese; ls -R mp $ echo hello > mp/greeting.txt
mp: $ mkdir mp/pizza
greeting.txt pizza/ $ touch mp/pizza/pepperoni mp/pizza/cheese
mp/pizza:
cheese pepperoni
``` ```
Now that we are finished working with this version, let's unmount it: Now that we are finished working with this version, let's unmount it:
``` ```
alex@wintermute ~/vfs> fusermount -u mp $ fusermount -u mp
``` ```
Let's take a look at the version structure that VFS has created in the database directory: Let's take a look at the version structure that VFS has created in the database directory:
``` ```
alex@wintermute ~/vfs> ls -R db $ ls -R db
db: db:
ver_00000000559a17e4/ ver_00000000559a17e4/
@ -129,20 +127,23 @@ Some points of interest about this structure:
Let's continue our walkthrough by mounting the now non-empty database once more: Let's continue our walkthrough by mounting the now non-empty database once more:
``` ```
alex@wintermute ~/vfs> vfs db mp $ vfs db mp
``` ```
Now let's make a couple of changes to the files and directory structure: Now let's make a couple of changes to the files and directory structure:
``` ```
echo こんにちは > mp/greeting.txt; rm mp/pizza/pepperoni; touch mp/pizza/bacon $ echo こんにちは > mp/greeting.txt
$ rm mp/pizza/pepperoni
$ touch mp/pizza/bacon
``` ```
...and verify that everything is as it should be; looks good so far! ...and verify that everything is as it should be; looks good so far!
``` ```
alex@wintermute ~/vfs> cat mp/greeting.txt; ls -R mp $ cat mp/greeting.txt
こんにちは こんにちは
$ ls -R mp
mp: mp:
greeting.txt pizza/ greeting.txt pizza/
@ -153,7 +154,8 @@ bacon cheese
Now let's unmount and examine at the contents of the database directory: Now let's unmount and examine at the contents of the database directory:
``` ```
alex@wintermute ~/vfs> fusermount -u mp; ls -l db $ fusermount -u mp
$ ls -l db
total 8 total 8
drwxr-xr-x 3 alex alex 4096 Jul 6 14:58 ver_00000000559a17e4/ drwxr-xr-x 3 alex alex 4096 Jul 6 14:58 ver_00000000559a17e4/
drwxr-xr-x 3 alex alex 4096 Jul 6 15:08 ver_00000000559a19b4/ drwxr-xr-x 3 alex alex 4096 Jul 6 15:08 ver_00000000559a19b4/
@ -162,7 +164,7 @@ drwxr-xr-x 3 alex alex 4096 Jul 6 15:08 ver_00000000559a19b4/
Cool, we have a new version! Let's take a closer look at its structure: Cool, we have a new version! Let's take a closer look at its structure:
``` ```
alex@wintermute ~/vfs> ls -R db/ver_00000000559a19b4/ $ ls -R db/ver_00000000559a19b4/
db/ver_00000000559a19b4/: db/ver_00000000559a19b4/:
meta.json root/ meta.json root/
@ -178,14 +180,14 @@ respectively. Notice that `cheese` is not listed; we didn't make any changes to
version is used. If we look at the contents of `meta.json`, we will see that the `pepperoni` file was deleted: version is used. If we look at the contents of `meta.json`, we will see that the `pepperoni` file was deleted:
``` ```
alex@wintermute ~/vfs> cat db/ver_00000000559a19b4/meta.json $ cat db/ver_00000000559a19b4/meta.json
{"deleted":["/pizza/pepperoni"]} {"deleted":["/pizza/pepperoni"]}
``` ```
Now let's examine the database from VFS tool directly: Now let's examine the database from VFS tool directly:
``` ```
alex@wintermute ~/vfs> vfs db $ vfs db
version: 1 time: 2015-07-06 14:53:40 +0900 JST version: 1 time: 2015-07-06 14:53:40 +0900 JST
version: 2 time: 2015-07-06 15:01:24 +0900 JST version: 2 time: 2015-07-06 15:01:24 +0900 JST
``` ```
@ -194,14 +196,15 @@ Finally, let's mount the version that we created in the beginning of this walkth
`version` parameter... `version` parameter...
``` ```
alex@wintermute ~/vfs> vfs -version=1 db mp $ vfs -version=1 db mp
``` ```
...and in a different terminal verify its contents; they are identical to the first version! ...and in a different terminal verify its contents; they are identical to the first version!
``` ```
alex@wintermute ~/vfs> cat mp/greeting.txt; ls -R mp $ cat mp/greeting.txt
Hello Hello
$ ls -R mp
mp: mp:
greeting.txt pizza/ greeting.txt pizza/