Re: [PATCH v2 09/15] qemu_firmware: Introduce qemuFirmwareFetchConfigs

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On Thu, Mar 07, 2019 at 10:29:19AM +0100, Michal Privoznik wrote:
> Implementation for yet another part of firmware description
> specification. This one covers selecting which files to parse.
> 
> There are three locations from which description files can be
> loaded. In order of preference, from most generic to most
> specific these are:
> 
>   /usr/share/qemu/firmware
>   /etc/qemu/firmware
>   $XDG_CONFIG_HOME/qemu/firmware
> 
> If a file is found in two or more locations then the most specific
> one is used. Moreover, if file is empty then it means it is
> overriding some generic description and disabling it.
> 
> Again, this is described in more details and with nice examples
> in firmware.json specification (qemu commit 3a0adfc9bf).
> 
> Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
> ---
>  src/qemu/qemu_firmware.c | 134 +++++++++++++++++++++++++++++++++++++++
>  src/qemu/qemu_firmware.h |   3 +
>  2 files changed, 137 insertions(+)
> 
> diff --git a/src/qemu/qemu_firmware.c b/src/qemu/qemu_firmware.c
> index 8f718ee2a6..a818f60c91 100644
> --- a/src/qemu/qemu_firmware.c
> +++ b/src/qemu/qemu_firmware.c
> @@ -21,9 +21,11 @@
>  #include <config.h>
>  
>  #include "qemu_firmware.h"
> +#include "configmake.h"
>  #include "qemu_capabilities.h"
>  #include "virarch.h"
>  #include "virfile.h"
> +#include "virhash.h"
>  #include "virjson.h"
>  #include "virlog.h"
>  #include "virstring.h"
> @@ -899,3 +901,135 @@ qemuFirmwareFormat(qemuFirmwarePtr fw)
>  
>      return virJSONValueToString(doc, true);
>  }
> +
> +
> +static int
> +qemuFirmwareBuildFileList(virHashTablePtr files, const char *dir)
> +{
> +    DIR *dirp;
> +    struct dirent *ent = NULL;
> +    int rc;
> +    int ret = -1;
> +
> +    if ((rc = virDirOpenIfExists(&dirp, dir)) < 0)
> +        return -1;
> +
> +    if (rc == 0)
> +        return 0;
> +
> +    while ((rc = virDirRead(dirp, &ent, dir)) > 0) {
> +        VIR_AUTOFREE(char *) filename = NULL;
> +        VIR_AUTOFREE(char *) path = NULL;
> +
> +        if (ent->d_type != DT_REG && ent->d_type != DT_LNK)
> +            continue;
> +
> +        if (STRPREFIX(ent->d_name, "."))
> +            continue;
> +
> +        if (VIR_STRDUP(filename, ent->d_name) < 0)
> +            goto cleanup;
> +
> +        if (virAsprintf(&path, "%s/%s", dir, filename) < 0)
> +            goto cleanup;
> +
> +        if (virHashUpdateEntry(files, filename, path) < 0)
> +            goto cleanup;
> +
> +        path = NULL;
> +    }
> +
> +    if (rc < 0)
> +        goto cleanup;
> +
> +    ret = 0;
> + cleanup:
> +    virDirClose(&dirp);
> +    return ret;
> +}
> +
> +static int
> +qemuFirmwareFilesSorter(const virHashKeyValuePair *a,
> +                        const virHashKeyValuePair *b)
> +{
> +    return strcmp(a->key, b->key);
> +}
> +
> +#define QEMU_FIRMWARE_SYSTEM_LOCATION PREFIX "/share/qemu/firmware"
> +#define QEMU_FIRMWARE_ETC_LOCATION SYSCONFDIR "/qemu/firmware"
> +
> +int
> +qemuFirmwareFetchConfigs(char ***firmwares)
> +{
> +    VIR_AUTOPTR(virHashTable) files = NULL;
> +    VIR_AUTOFREE(char *) homeConfig = NULL;
> +    VIR_AUTOFREE(char *) xdgConfig = NULL;
> +    VIR_AUTOFREE(virHashKeyValuePairPtr) pairs = NULL;
> +    virHashKeyValuePairPtr tmp = NULL;
> +
> +    *firmwares = NULL;
> +
> +    if (VIR_STRDUP(xdgConfig, virGetEnvBlockSUID("XDG_CONFIG_HOME")) < 0)
> +        return -1;
> +
> +    if (!xdgConfig) {
> +        VIR_AUTOFREE(char *) home = virGetUserDirectory();
> +
> +        if (!home)
> +            return -1;
> +
> +        if (virAsprintf(&xdgConfig, "%s/.config", home) < 0)
> +            return -1;
> +    }
> +
> +    if (virAsprintf(&homeConfig, "%s/qemu/firmware", xdgConfig) < 0)
> +        return -1;
> +
> +    if (!(files = virHashCreate(10, virHashValueFree)))
> +        return -1;
> +
> +    if (qemuFirmwareBuildFileList(files, QEMU_FIRMWARE_SYSTEM_LOCATION) < 0)
> +        return -1;
> +
> +    if (qemuFirmwareBuildFileList(files, QEMU_FIRMWARE_ETC_LOCATION) < 0)
> +        return -1;
> +
> +    if (qemuFirmwareBuildFileList(files, homeConfig) < 0)
> +        return -1;

I wonder if it really makes sense to read /root/ for this. Normally we would
only look at the home config for unprivileged daemon, eg we don't look in
/root for finding PKI x509 certs IIRC.


Regards,
Daniel
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