Add support for adding empty partition entries. I.e. skip partition
numbers or names. This gives more control over the actual layout and helps to construct BSD disklabels with /usr or /var at dedicated partitions. Obtained from: Juniper Networks, Inc. MFC after: 3 days Relnotes: yes
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=271482
@ -24,7 +24,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 4, 2014
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.Dd September 12, 2014
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.Dt MKIMG 1
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.Os
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.Sh NAME
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@ -171,6 +171,25 @@ utility as follows:
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.Dl % mkimg -s mbr -b /boot/mbr -p freebsd:-'mkimg -s bsd -b /boot/boot \
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-p freebsd-ufs:=root-file-system.ufs -p freebsd-swap::1G' -o mbr-bsd.img
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.Pp
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To accomodate the need to have partitions named or numbered in a certain
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way, the
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.Nm
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utility allows for the specification of empty partitions.
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For example, to create an image that is compatible with partition layouts
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found in
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.Pa /etc/disktab ,
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the 'd' partition often needs to be skipped.
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This is accomplished by inserting an unused partition after the first 2
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partition specifications.
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It is worth noting at this time that the BSD scheme will automatically
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skip the 'c' partition by virtue of it referring to the entire disk.
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To create an image that is compatible with the qp120at disk, use the
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.Nm
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utility as follows:
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.Dl % mkimg -s bsd -b /boot/boot -p freebsd-ufs:=root-file-system.ufs \
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-p freebsd-swap::20M -p- -p- -p- -p- -p freebsd-ufs:=usr-file-system.ufs \
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-o bsd.img
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.Pp
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For partitioning schemes that feature partition labels, the
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.Nm
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utility supports assigning labels to the partitions specified.
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@ -101,6 +101,7 @@ usage(const char *why)
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"are determined\n\t\t\t\t by the named file\n");
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fprintf(stderr, "\t<t>[/<l>]:-<cmd>\t- partition content and size "
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"are taken from\n\t\t\t\t the output of the command to run\n");
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fprintf(stderr, "\t-\t\t\t- unused partition entry\n");
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fprintf(stderr, "\t where:\n");
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fprintf(stderr, "\t\t<t>\t- scheme neutral partition type\n");
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fprintf(stderr, "\t\t<l>\t- optional scheme-dependent partition "
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@ -140,6 +141,9 @@ pwr_of_two(u_int nr)
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* '-' contents holds a command to run; the output of
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* which is the contents of the partition.
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* contents the specification of a partition's contents
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*
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* A specification that is a single dash indicates an unused partition
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* entry.
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*/
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static int
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parse_part(const char *spec)
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@ -149,6 +153,11 @@ parse_part(const char *spec)
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size_t len;
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int error;
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if (strcmp(spec, "-") == 0) {
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nparts++;
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return (0);
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}
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part = calloc(1, sizeof(struct part));
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if (part == NULL)
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return (ENOMEM);
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