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Re: [libvirt] [PATCH v2 2/4] util: add functions to keep capabilities



On Tue, Jan 31, 2012 at 01:50:42PM +0900, Taku Izumi wrote:
> 
> This patch introduces virSetCapabilities() function and implements
> virCommandAllowCap() function.
> 
> Existing virClearCapabilities() is function to clear all capabilities.
> Instead virSetCapabilities() is function to set arbitrary capabilities.
> 
> 
> Signed-off-by: Taku Izumi <izumi taku jp fujitsu com>
> Signed-off-by: Shota Hirae <m11g1401 hibikino ne jp>
> ---
>  src/util/command.c |   43 +++++++++++++++++++++++++++++++++++++------
>  src/util/command.h |    2 --
>  2 files changed, 37 insertions(+), 8 deletions(-)
> 
> Index: libvirt/src/util/command.c
> ===================================================================
> --- libvirt.orig/src/util/command.c
> +++ libvirt/src/util/command.c
> @@ -103,6 +103,8 @@ struct _virCommand {
>      pid_t pid;
>      char *pidfile;
>      bool reap;
> +
> +    unsigned long long capabilities;
>  };
>  
>  /*
> @@ -182,6 +184,33 @@ static int virClearCapabilities(void)
>  
>      return 0;
>  }
> +
> +/**
> + * virSetCapabilities:
> + *  @capabilities - capability flag to set.
> + *                  In case of 0, this function is identical to
> + *                  virClearCapabilities()
> + *
> + */
> +static int virSetCapabilities(unsigned long long capabilities)
> +{
> +    int ret, i;
> +
> +    capng_clear(CAPNG_SELECT_BOTH);
> +
> +    for (i = 0; i <= CAP_LAST_CAP; i++) {
> +        if (capabilities & (1ULL << i))
> +            capng_update(CAPNG_ADD, CAPNG_BOUNDING_SET, i);
> +    }
> +
> +    if ((ret = capng_apply(CAPNG_SELECT_BOTH)) < 0) {
> +        virCommandError(VIR_ERR_INTERNAL_ERROR,
> +                        _("cannot apply process capabilities %d"), ret);
> +        return -1;
> +    }
> +
> +    return 0;
> +}
>  # else
>  static int virClearCapabilities(void)
>  {
> @@ -189,6 +218,11 @@ static int virClearCapabilities(void)
>  //             "capabilities");
>      return 0;
>  }
> +
> +static int virSetCapabilities(unsigned long long capabilities)
> +{
> +    return 0;
> +}
>  # endif
>  
>  /**
> @@ -883,26 +917,23 @@ virCommandClearCaps(virCommandPtr cmd)
>      cmd->flags |= VIR_EXEC_CLEAR_CAPS;
>  }
>  
> -#if 0 /* XXX Enable if we have a need for capability management.  */
> -
>  /**
>   * virCommandAllowCap:
>   * @cmd: the command to modify
>   * @capability: what to allow
>   *
> - * Re-allow a specific capability
> + * Allow specific capabilities
>   */
>  void
>  virCommandAllowCap(virCommandPtr cmd,
> -                   int capability ATTRIBUTE_UNUSED)
> +                   int capability)
>  {
>      if (!cmd || cmd->has_error)
>          return;
>  
> -    /* XXX ? */
> +    cmd->capabilities |= (1ULL << capability);
>  }
>  
> -#endif /* 0 */
>  
>  
>  /**
> Index: libvirt/src/util/command.h
> ===================================================================
> --- libvirt.orig/src/util/command.h
> +++ libvirt/src/util/command.h
> @@ -60,10 +60,8 @@ void virCommandSetPidFile(virCommandPtr 
>  
>  void virCommandClearCaps(virCommandPtr cmd);
>  
> -# if 0
>  void virCommandAllowCap(virCommandPtr cmd,
>                          int capability);
> -# endif
>  
>  void virCommandDaemonize(virCommandPtr cmd);

ACK


Daniel
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