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Implement CLI "dd" command - copy data between Vitastor images, files and pipes

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This commit is contained in:
Vitaliy Filippov
2024-08-30 02:31:06 +03:00
parent b804051eaf
commit 986cd11705
11 changed files with 1053 additions and 14 deletions
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src/cmd/cli.cpp
+39
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@@ -62,6 +62,31 @@ static const char* help_text =
" Other options:\n"
" --down-ok Continue deletion/merging even if some data will be left on unavailable OSDs.\n"
"\n"
"vitastor-cli dd [iimg=<image> | if=<file>] [oimg=<image> | of=<file>] [bs=1M]\n"
" [count=N] [seek/oseek=N] [skip/iseek=M] [iodepth=N] [status=progress]\n"
" [conv=nocreat,noerror,nofsync,trunc,nosparse] [iflag=direct] [oflag=direct,append]\n"
" Copy data between Vitastor images, files and pipes.\n"
" Options can be specified in classic dd style (key=value) or like usual (--key value).\n"
" iimg=<image> Copy from Vitastor image <image>\n"
" if=<file> Copy from file <file>\n"
" oimg=<image> Copy to Vitastor image <image>\n"
" of=<file> Copy to file <file>\n"
" bs=1M Set copy block size\n"
" count=N Copy only N input blocks. If N ends in B it counts bytes, not blocks\n"
" seek/oseek=N Skip N output blocks. If N ends in B it counts bytes, not blocks\n"
" skip/iseek=N Skip N input blocks. If N ends in B it counts bytes, not blocks\n"
" iodepth=N Send N reads or writes in parallel (default 4)\n"
" status=LEVEL The LEVEL of information to print to stderr: none/noxfer/progress\n"
" size=N Specify size for the created output file/image (defaults to input size)\n"
" iflag=direct For files only: use direct I/O\n"
" oflag=direct For files only: use direct I/O\n"
" oflag=append For files only: append to output file\n"
" conv=nocreat Do not create output file/image\n"
" conv=trunc For files only: truncate output file\n"
" conv=noerror Continue read after errors\n"
" conv=nofsync Do not call fsync before finishing (default behaviour is fsync)\n"
" conv=nosparse Write all output blocks including all-zero blocks\n"
"\n"
"vitastor-cli flatten <layer>\n"
" Flatten a layer, i.e. merge data and detach it from parents.\n"
"\n"
@@ -382,6 +407,20 @@ static int run(cli_tool_t *p, json11::Json::object cfg)
}
action_cb = p->start_flatten(cfg);
}
else if (cmd[0] == "dd")
{
// Read or write to/from cluster
for (int i = 0; i < cmd.size(); i++)
{
auto arg = cmd[i].string_value();
ssize_t p = arg.find("=");
if (p != std::string::npos)
{
cfg[arg.substr(0, p)] = arg.substr(p+1);
}
}
action_cb = p->start_dd(cfg);
}
else if (cmd[0] == "rm")
{
// Remove multiple snapshots and rebase their children