Chen, Hanxiao
2015-Mar-24 05:25 UTC
Re: [Libguestfs] [PATCH] New API: part_get_part_type for showing partition type
> -----Original Message----- > From: Richard W.M. Jones [mailto:rjones@redhat.com] > Sent: Monday, March 23, 2015 9:29 PM > To: Chen, Hanxiao/陈 晗霄 > Cc: libguestfs@redhat.com > Subject: Re: [Libguestfs] [PATCH] New API: part_get_part_type for showing partition > type > > On Tue, Mar 17, 2015 at 02:45:46AM -0400, Chen Hanxiao wrote: > > This patch will add support for getting partition type > > of a partiton numbered device. > > > > Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com> > > --- > > daemon/parted.c | 112 > +++++++++++++++++++++++++++++++++++++++++++++++++++ > > generator/actions.ml | 18 +++++++++ > > src/MAX_PROC_NR | 2 +- > > 3 files changed, 131 insertions(+), 1 deletion(-) > > > > diff --git a/daemon/parted.c b/daemon/parted.c > > index a7bcb99..0ae6e5c 100644 > > --- a/daemon/parted.c > > +++ b/daemon/parted.c > > @@ -33,6 +33,10 @@ GUESTFSD_EXT_CMD(str_parted, parted); > > GUESTFSD_EXT_CMD(str_sfdisk, sfdisk); > > GUESTFSD_EXT_CMD(str_sgdisk, sgdisk); > > > > +#ifndef PARTED_NO_M > > +# define PARTED_NO_M 0 > > +#endif > > What does this bit do?I want to use print_partition_table(xxx, 0) but do not want to pass a raw '0'. Maybe the name is not so clear. I'll rename it to PARTED_NOT_USE_M in the next version.> > > /* Notes: > > * > > * Parted 1.9 sends error messages to stdout, hence use of the > > @@ -1022,3 +1026,111 @@ do_part_get_name (const char *device, int partnum) > > reply_with_error ("cannot get the partition name from '%s' layouts", parttype); > > return NULL; > > } > > + > > +char * > > +do_part_get_part_type (const char *device, int partnum) > > +{ > > + CLEANUP_FREE char *parttype; > > + char *part_type; > > + > > + if (partnum <= 0) { > > + reply_with_error ("partition number must be >= 1"); > > + return NULL; > > + } > > + > > + parttype = do_part_get_parttype (device); > > + if (parttype == NULL) > > + return NULL; > > + > > + if (STREQ (parttype, "gpt")) { > > + part_type = strdup("primary"); > > + if (part_type == NULL) { > > + reply_with_error ("strdup failed"); > > + return NULL; > > + } > > + return part_type; > > + } > > + > > + /* machine parseable output by 'parted -m' did not provide > > + * partition type info. > > + * Use traditional style. > > + */ > > + CLEANUP_FREE char *out = print_partition_table (device, PARTED_NO_M); > > + if (!out) > > + return NULL; > > + > > + CLEANUP_FREE_STRING_LIST char **lines = split_lines (out); > > + > > + if (!lines) > > + return NULL; > > + > > + size_t start = 0, end = 0, row; > > + > > + for (row = 0; lines[row] != NULL; ++row) > > + if (STRPREFIX (lines[row], "Number")) { > > + start = row + 1; > > + break; > > + } > > + > > + if (start == 0) { > > + reply_with_error ("parted output has no \"Number\" line"); > > + return NULL; > > + } > > + > > + for (row = start; lines[row] != NULL; ++row) > > + if (STREQ (lines[row], "")) { > > + end = row; > > + break; > > + } > > + > > + if (end == 0) { > > + reply_with_error ("parted output has no blank after end of table"); > > + return NULL; > > + } > > + > > + /* Now parse the lines. */ > > + size_t i; > > + int64_t temp_int64; > > + int part_num; > > + char temp_type[16]; > > + for (i = 0, row = start; row < end; ++i, ++row) { > > + if (sscanf (lines[row], "%d%" SCNi64 "B%" SCNi64 "B%" SCNi64 "B" "%s", > > + &part_num, > > + &temp_int64, > > + &temp_int64, > > + &temp_int64, > > + temp_type) != 5) { > > We're hoping here that the output of 'parted' never changes and > overflows the 16 byte buffer. > > Instead of hoping, you can guarantee that by replacing %s with %15sWill fix. Regards, - Chen> > > + reply_with_error ("could not parse row from output of parted print > command: %s", lines[row]); > > + return NULL; > > + } > > + > > + if (part_num != partnum) > > + continue; > > + > > + if (STRPREFIX (temp_type, "primary")) { > > + part_type = strdup("primary"); > > + if (part_type == NULL) > > + goto error; > > + } else if (STRPREFIX (temp_type, "logical")) { > > + part_type = strdup("logical"); > > + if (part_type == NULL) > > + goto error; > > + } else if (STRPREFIX (temp_type, "extended")) { > > + part_type = strdup("extended"); > > + if (part_type == NULL) > > + goto error; > > + } else > > + goto error; > > + > > + return part_type; > > + } > > + > > + if (row == end) { > > + reply_with_error ("could not find partnum: %d", partnum); > > + return NULL; > > + } > > + > > + error: > > + reply_with_error ("strdup failed"); > > + return NULL; > > +} > > diff --git a/generator/actions.ml b/generator/actions.ml > > index fb971d3..72418b0 100644 > > --- a/generator/actions.ml > > +++ b/generator/actions.ml > > @@ -12522,6 +12522,24 @@ This will Enable extended inode refs." }; > > longdesc = "\ > > This enable skinny metadata extent refs." }; > > > > + { defaults with > > + name = "part_get_part_type"; > > + style = RString "partitiontype", [Device "device"; Int "partnum"], []; > > + proc_nr = Some 453; > > + tests = [ > > + InitEmpty, Always, TestResultString ( > > + [["part_init"; "/dev/sda"; "mbr"]; > > + ["part_add"; "/dev/sda"; "p"; "64"; "204799"]; > > + ["part_add"; "/dev/sda"; "e"; "204800"; "614400"]; > > + ["part_add"; "/dev/sda"; "l"; "204864"; "205988"]; > > + ["part_get_part_type"; "/dev/sda"; "5"]], "logical"), [] > > + ]; > > + > > + shortdesc = "get the partition type"; > > + longdesc = "\ > > +This could get the partition type, such as primary, logical, > > +on partition numbered C<partnum> on device C<device>." }; > > + > > ] > > > > (* Non-API meta-commands available only in guestfish. > > diff --git a/src/MAX_PROC_NR b/src/MAX_PROC_NR > > index 8670c73..534b992 100644 > > --- a/src/MAX_PROC_NR > > +++ b/src/MAX_PROC_NR > > @@ -1 +1 @@ > > -452 > > +453 > > Rich. > > -- > Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones > Read my programming and virtualization blog: http://rwmj.wordpress.com > virt-top is 'top' for virtual machines. Tiny program with many > powerful monitoring features, net stats, disk stats, logging, etc. > http://people.redhat.com/~rjones/virt-top
Pino Toscano
2015-Mar-24 08:44 UTC
Re: [Libguestfs] [PATCH] New API: part_get_part_type for showing partition type
On Tuesday 24 March 2015 05:25:51 Chen, Hanxiao wrote:> > > -----Original Message----- > > From: Richard W.M. Jones [mailto:rjones@redhat.com] > > Sent: Monday, March 23, 2015 9:29 PM > > To: Chen, Hanxiao/陈 晗霄 > > Cc: libguestfs@redhat.com > > Subject: Re: [Libguestfs] [PATCH] New API: part_get_part_type for showing partition > > type > > > > On Tue, Mar 17, 2015 at 02:45:46AM -0400, Chen Hanxiao wrote: > > > This patch will add support for getting partition type > > > of a partiton numbered device. > > > > > > Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com> > > > --- > > > daemon/parted.c | 112 > > +++++++++++++++++++++++++++++++++++++++++++++++++++ > > > generator/actions.ml | 18 +++++++++ > > > src/MAX_PROC_NR | 2 +- > > > 3 files changed, 131 insertions(+), 1 deletion(-) > > > > > > diff --git a/daemon/parted.c b/daemon/parted.c > > > index a7bcb99..0ae6e5c 100644 > > > --- a/daemon/parted.c > > > +++ b/daemon/parted.c > > > @@ -33,6 +33,10 @@ GUESTFSD_EXT_CMD(str_parted, parted); > > > GUESTFSD_EXT_CMD(str_sfdisk, sfdisk); > > > GUESTFSD_EXT_CMD(str_sgdisk, sgdisk); > > > > > > +#ifndef PARTED_NO_M > > > +# define PARTED_NO_M 0 > > > +#endif > > > > What does this bit do? > > I want to use print_partition_table(xxx, 0) > but do not want to pass a raw '0'. > Maybe the name is not so clear. > I'll rename it to PARTED_NOT_USE_M in the next version.Improving the readability of a raw integer is a good thing; however, I'd suggest switching to an enum instead. -- Pino Toscano
Chen, Hanxiao
2015-Mar-24 09:19 UTC
Re: [Libguestfs] [PATCH] New API: part_get_part_type for showing partition type
> -----Original Message----- > From: libguestfs-bounces@redhat.com [mailto:libguestfs-bounces@redhat.com] On > Behalf Of Pino Toscano > Sent: Tuesday, March 24, 2015 4:44 PM > To: libguestfs@redhat.com > Subject: Re: [Libguestfs] [PATCH] New API: part_get_part_type for showing partition > type > > On Tuesday 24 March 2015 05:25:51 Chen, Hanxiao wrote: > > > > > -----Original Message----- > > > From: Richard W.M. Jones [mailto:rjones@redhat.com] > > > Sent: Monday, March 23, 2015 9:29 PM > > > To: Chen, Hanxiao/陈 晗霄 > > > Cc: libguestfs@redhat.com > > > Subject: Re: [Libguestfs] [PATCH] New API: part_get_part_type for showing > partition > > > type > > > > > > On Tue, Mar 17, 2015 at 02:45:46AM -0400, Chen Hanxiao wrote: > > > > This patch will add support for getting partition type > > > > of a partiton numbered device. > > > > > > > > Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com> > > > > --- > > > > daemon/parted.c | 112 > > > +++++++++++++++++++++++++++++++++++++++++++++++++++ > > > > generator/actions.ml | 18 +++++++++ > > > > src/MAX_PROC_NR | 2 +- > > > > 3 files changed, 131 insertions(+), 1 deletion(-) > > > > > > > > diff --git a/daemon/parted.c b/daemon/parted.c > > > > index a7bcb99..0ae6e5c 100644 > > > > --- a/daemon/parted.c > > > > +++ b/daemon/parted.c > > > > @@ -33,6 +33,10 @@ GUESTFSD_EXT_CMD(str_parted, parted); > > > > GUESTFSD_EXT_CMD(str_sfdisk, sfdisk); > > > > GUESTFSD_EXT_CMD(str_sgdisk, sgdisk); > > > > > > > > +#ifndef PARTED_NO_M > > > > +# define PARTED_NO_M 0 > > > > +#endif > > > > > > What does this bit do? > > > > I want to use print_partition_table(xxx, 0) > > but do not want to pass a raw '0'. > > Maybe the name is not so clear. > > I'll rename it to PARTED_NOT_USE_M in the next version. > > Improving the readability of a raw integer is a good thing; however, > I'd suggest switching to an enum instead. >Hi, How about: enum { PARTED_INVALID = -1, /* parted do not support -m option */ PARTED_OPT_NO_M, PARTED_OPT_M}; print_partition_table(xxx, PARTED_OPT_NO_M) Regards, - Chen
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