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vsh: Add helper for auto-removing temporary file

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The vsh helpers for user-editing of contents use temporary files.
Introduce 'vshTempFile' type which automatically removes the file.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2022-03-01 17:00:56 +01:00
parent a3ef5414ed
commit 8c35dcf9fc
2 changed files with 22 additions and 6 deletions
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25
tools/vsh.c
View File

@ -2378,34 +2378,47 @@ vshAskReedit(vshControl *ctl,
#endif /* WIN32 */
void
vshEditUnlinkTempfile(char *file)
{
if (!file)
return;
ignore_value(unlink(file));
g_free(file);
}
/* Common code for the edit / net-edit / pool-edit functions which follow. */
char *
vshEditWriteToTempFile(vshControl *ctl, const char *doc)
{
g_autofree char *ret = NULL;
g_autofree char *filename = NULL;
g_autoptr(vshTempFile) ret = NULL;
const char *tmpdir;
VIR_AUTOCLOSE fd = -1;
tmpdir = getenv("TMPDIR");
if (!tmpdir) tmpdir = "/tmp";
ret = g_strdup_printf("%s/virshXXXXXX.xml", tmpdir);
fd = g_mkstemp_full(ret, O_RDWR | O_CLOEXEC, S_IRUSR | S_IWUSR);
if (!tmpdir)
tmpdir = "/tmp";
filename = g_strdup_printf("%s/virshXXXXXX.xml", tmpdir);
fd = g_mkstemp_full(filename, O_RDWR | O_CLOEXEC, S_IRUSR | S_IWUSR);
if (fd == -1) {
vshError(ctl, _("g_mkstemp_full: failed to create temporary file: %s"),
g_strerror(errno));
return NULL;
}
ret = g_steal_pointer(&filename);
if (safewrite(fd, doc, strlen(doc)) == -1) {
vshError(ctl, _("write: %s: failed to write to temporary file: %s"),
ret, g_strerror(errno));
unlink(ret);
return NULL;
}
if (VIR_CLOSE(fd) < 0) {
vshError(ctl, _("close: %s: failed to write or close temporary file: %s"),
ret, g_strerror(errno));
unlink(ret);
return NULL;
}

3
tools/vsh.h
View File

@ -341,6 +341,9 @@ void vshSaveLibvirtError(void);
void vshSaveLibvirtHelperError(void);
/* file handling */
void vshEditUnlinkTempfile(char *file);
typedef char vshTempFile;
G_DEFINE_AUTOPTR_CLEANUP_FUNC(vshTempFile, vshEditUnlinkTempfile);
char *vshEditWriteToTempFile(vshControl *ctl, const char *doc);
int vshEditFile(vshControl *ctl, const char *filename);
char *vshEditReadBackFile(vshControl *ctl, const char *filename);