[tarantool-patches] Re: [PATCH 4/4] Introduce storage reload evolution

[Alex Khatskevich <avkhatskevich@tarantool.org>]

diff of test/lua_libs/git_util.lua



commit 199e198af97200e9a01b5b2568c8e9b2a2a9f34d
Author: AKhatskevich <avkhatskevich@tarantool.org>
Date:   Fri Jun 29 20:34:26 2018 +0300

     Introduce storage reload evolution

     Changes:
     1. Introduce storage reload evolution.
     2. Setup cross-version reload testing.

     1:
     This mechanism updates Lua objects on reload in case they are
     changed in a new vshard.storage version.

     Since this commit, any change in vshard.storage.M has to be
     reflected in vshard.storage.reload_evolution to guarantee
     correct reload.

     2:
     The testing uses git infrastructure and is performed in the following
     way:
     1. Copy old version of vshard to a temp folder.
     2. Run vshard on this code.
     3. Checkout the latest version of the vshard sources.
     4. Reload vshard storage.
     5. Make sure it works (Perform simple tests).

     Notes:
     * this patch contains some legacy-driven decisions:
       1. SOURCEDIR path retrieved differently in case of
          packpack build.
       2. git directory in the `reload_evolution/storage` test
          is copied with respect to Centos 7 and `ro` mode of
          SOURCEDIR.

     Closes #112 #125

diff --git a/test/lua_libs/git_util.lua b/test/lua_libs/git_util.lua
new file mode 100644
index 0000000..8826c4c
--- /dev/null
+++ b/test/lua_libs/git_util.lua
@@ -0,0 +1,49 @@
+--
+-- Lua bridge for some of the git commands.
+--
+local os = require('os')
+
+--
+-- Exec a git command.
+-- @param params Table of parameters:
+--        * options - git options.
+--        * cmd - git command.
+--        * args - command arguments.
+--        * dir - working directory.
+--        * fout - write output to the file.
+local function exec_cmd(params)
+    local fout = params.fout
+    local shell_cmd = {'git'}
+    for _, param in pairs({'options', 'cmd', 'args'}) do
+        table.insert(shell_cmd, params[param])
+    end
+    if fout then
+        table.insert(shell_cmd, ' >' .. fout)
+    end
+    shell_cmd = table.concat(shell_cmd, ' ')
+    if params.dir then
+        shell_cmd = string.format('cd %s && %s', params.dir, shell_cmd)
+    end
+    local res = os.execute(shell_cmd)
+    assert(res == 0, 'Git cmd error: ' .. res)
+end
+
+local function log_hashes(params)
+    params.args = "--format='%h' " .. params.args
+    -- Store log to the file.
+    local temp_file = os.tmpname()
+    params.fout = temp_file
+    params.cmd = 'log'
+    exec_cmd(params)
+    local lines = {}
+    for line in io.lines(temp_file) do
+        table.insert(lines, line)
+    end
+    os.remove(temp_file)
+    return lines
+end
+
+return {
+    exec_cmd = exec_cmd,
+    log_hashes = log_hashes
+}