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zdump: copy: add support for file output

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It is unusual to write the file output from a tool to stdout. Therefore
add a positional argument to the zgetdump convert action where the
output file can be specified. If no positional argument is given the
output is written to stdout as before and therefore there is no change
in the default behavior.

If the file output already exists an error is returned. The reason for
this is to avoid the situation where an existing dump is accidentally
overwritten by the user.

Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Marc Hartmayer
2021-11-11 09:40:24 +01:00
committed by Jan Höppner
parent d60b7770fd
commit e9deec4c62
7 changed files with 63 additions and 17 deletions
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37
zdump/zgetdump.c
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@@ -30,7 +30,7 @@
#include "dt.h"
#include "dfi.h"
#include "dfo.h"
#include "stdout.h"
#include "output.h"
#include "zfuse.h"
/*
@@ -156,18 +156,39 @@ static int do_mount(void)
return rc;
}
/*
* Run "copy to stdout" action
*/
static int do_copy(void)
static int open_file_for_writing(const char *output)
{
int rc;
int fd;
if (output) {
fd = open(output,
O_CREAT | O_EXCL | O_WRONLY | O_CLOEXEC,
0600);
if (fd == -1)
ERR_EXIT_ERRNO("Could not open '%s' exclusively", output);
} else {
fd = dup(STDOUT_FILENO);
if (fd == -1)
ERR_EXIT_ERRNO("Could not dup() stdout");
}
return fd;
}
/*
* Run "copy to output" action
*/
static int do_copy(const char *output)
{
int rc, fd;
if (dfi_init() != 0)
ERR_EXIT("Dump cannot be processed (is not complete)");
dfo_init();
kdump_select_check();
rc = stdout_write_dump();
fd = open_file_for_writing(output);
rc = write_dump(fd);
close(fd);
dfi_exit();
return rc;
}
@@ -185,7 +206,7 @@ int main(int argc, char *argv[])
switch (g.opts.action) {
case ZG_ACTION_COPY:
return do_copy();
return do_copy(g.opts.output_path);
case ZG_ACTION_DUMP_INFO:
return do_dump_info();
case ZG_ACTION_DEVICE_INFO: