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compose: Add --workdir-tmpfs

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This ~halves the write traffic to my SSD when doing local composes.
My laptop has 12GiB of RAM, plenty for this.
This commit is contained in:
Colin Walters 2014-07-01 22:07:56 -04:00
parent fd045ca511
commit 19d093a496
1 changed files with 38 additions and 1 deletions
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37
src/rpmostree-compose-builtin-tree.c
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@ -23,6 +23,7 @@
#include <string.h>
#include <glib-unix.h>
#include <json-glib/json-glib.h>
#include <sys/mount.h>
#include <gio/gunixoutputstream.h>
#include "rpmostree-compose-builtins.h"
@ -32,6 +33,7 @@
#include "libgsystem.h"
static char *opt_workdir;
static gboolean opt_workdir_tmpfs;
static char *opt_cachedir;
static char *opt_proxy;
static char *opt_repo;
@ -39,6 +41,7 @@ static gboolean opt_print_only;
static GOptionEntry option_entries[] = {
{ "workdir", 0, 0, G_OPTION_ARG_STRING, &opt_workdir, "Working directory", "WORKDIR" },
{ "workdir-tmpfs", 0, 0, G_OPTION_ARG_NONE, &opt_workdir_tmpfs, "Use tmpfs for working state", NULL },
{ "cachedir", 0, 0, G_OPTION_ARG_STRING, &opt_cachedir, "Cached state", "CACHEDIR" },
{ "repo", 'r', 0, G_OPTION_ARG_STRING, &opt_repo, "Path to OSTree repository", "REPO" },
{ "proxy", 0, 0, G_OPTION_ARG_STRING, &opt_proxy, "HTTP proxy", "PROXY" },
@ -893,6 +896,35 @@ rpmostree_compose_builtin_tree (int argc,
gs_free char *tmpd = g_mkdtemp (g_strdup ("/var/tmp/rpm-ostree.XXXXXX"));
workdir = g_file_new_for_path (tmpd);
workdir_is_tmp = TRUE;
if (opt_workdir_tmpfs)
{
/* Use a private mount namespace to avoid polluting the global
* namespace, and to ensure the mount gets cleaned up if we exit
* unexpectedly.
*/
if (unshare (CLONE_NEWNS) != 0)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"unshare(CLONE_NEWNS): %s", g_strerror (errno));
goto out;
}
if (mount (NULL, "/", "none", MS_PRIVATE | MS_REC, NULL) == -1)
{
int errsv = errno;
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"mount(/, MS_PRIVATE | MS_REC): %s",
g_strerror (errsv));
goto out;
}
if (mount ("tmpfs", tmpd, "tmpfs", 0, (const void*)"mode=755") != 0)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"mount(tmpfs): %s", g_strerror (errno));
goto out;
}
}
}
if (opt_cachedir)
@ -1122,8 +1154,13 @@ rpmostree_compose_builtin_tree (int argc,
g_print ("Complete\n");
out:
if (workdir_is_tmp)
{
if (opt_workdir_tmpfs)
(void) umount (gs_file_get_path_cached (workdir));
(void) gs_shutil_rm_rf (workdir, NULL, NULL);
}
if (self)
{
g_ptr_array_unref (self->treefile_context_dirs);