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add a method for migrating config file values

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e.g. commit 523b273a changed the names of config file entries, which
leads to unwanted changes in appearance.
To avoid this in the future, add a migrateConfig() function in neutrino
which fixes this commit and can be extended in the future if necessary.
This commit is contained in:
Stefan Seyfried
2016-01-01 15:43:05 +01:00
parent 57d9b388d4
commit 74293c13b6
2 changed files with 50 additions and 0 deletions
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48
src/neutrino.cpp
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@@ -354,6 +354,8 @@ int CNeutrinoApp::loadSetup(const char * fname)
!configfile.getInt32("screen_EndY_lcd", 0)) {
printf("[neutrino] config file %s is broken, using defaults\n", fname);
configfile.clear();
} else {
migrateConfig(fname);
}
}
parentallocked = !access(NEUTRINO_PARENTALLOCKED_FILE, R_OK);
@@ -4759,3 +4761,49 @@ bool CNeutrinoApp::adjustToChannelID(const t_channel_id channel_id)
return true;
}
/*
* commit 523b273a changed the names of config file entries:
* casystem_display => infobar_casystem_display
* casystem_dotmatrix => infobar_casystem_dotmatrix
* casystem_frame => infobar_casystem_frame
* convert these, so that users do not need to set up their system again
*/
struct __key_rename {
const char *from;
const char *to;
};
static struct __key_rename key_rename[] = {
{ "casystem_display", "infobar_casystem_display" },
{ "casystem_dotmatrix", "infobar_casystem_dotmatrix"},
{ "casystem_frame", "infobar_casystem_frame" },
{ NULL, NULL }
};
/* actually do the migration of the config entries */
void CNeutrinoApp::migrateConfig(const char *fname)
{
/* we need a second configfile to not create new entries and trigger the
* "new entry created" flag */
CConfigFile migconf('\t', false);
migconf.loadConfig(fname);
/* here we do a simple rename of config file keys */
int magic = -424242; /* obviously a value that does not appear in real cases */
int tmp = magic;
int i;
for (i = 0; key_rename[i].from != NULL; i++) {
const char *from = key_rename[i].from;
const char *to = key_rename[i].to;
tmp = migconf.getInt32(from, magic);
if (tmp == magic) /* old key does not exist */
continue;
/* only set new key to old value if the new key does not yet exist */
if (configfile.getInt32(to, magic) == magic)
configfile.setInt32(to, tmp);
/* always remove old key*/
configfile.deleteKey(from);
}
/* more complex migration, including converting values etc. could be done here */
}