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history: add support for gefs dumps

--- a/rc/bin/history

+++ b/rc/bin/history

@@ -31,7 +31,7 @@

 		echo history: warning: $file does not exist >[1=2]

 	old=()

-	ls -Qqr /n/$dump/*/*/$file >[2] /dev/null |

+	list $file |

 	sed  's/\(([^ ]*) *([^ ]*) *([^ ]*)\)/\1\2\3/p' |

 	awk '"/n/'$dump/$since'" <= $2 {next}

 	     $1 != qid {

@@ -46,7 +46,7 @@

 	}

 }

-flagfmt='D,a,b,f,c,e,m,n,w,u,d:dump,s since'

+flagfmt='D,a,b,f,c,e,m,n,w,u,t:tag tag,d:dump,s since'

 args='[ -Dabcemnw ] [ -uf ] [ -d dumpfilesystem ] [ -s yyyymmdd ] files ...'

 if(! ifs=() eval `{aux/getflags $*} || 

    ~ $#* 0 ||

@@ -58,7 +58,8 @@

 if(~ $#dump 0)

 	dump=dump

-

+if(~ $#tag 0)

+	tag=main

 if(~ $#flags 0)

 	flags=`{date -f 'YYYYMMDD'}

@@ -65,7 +66,15 @@

 if(~ $#flagu 1)

 	flagu=-u

-since=`{date -f 'YYYY\/MMDD' `{seconds -f 'YYYYMMDD' $flags}}

+# probably gefs

+if(test -e /n/$dump/adm){

+	fn list { ls -Qqr /n/$dump/$tag@day.*/$1  >[2] /dev/null }

+	since=`{date -f '[main@day.]YYYY.MM.DD[_]hh:mm:ss' `{seconds -f 'YYYYMMDD' $flags}}

+}

+if not {

+	fn list { ls -Qqr /n/$dump/*/*/$1  >[2] /dev/null }

+	since=`{date -f 'YYYY\/MMDD' `{seconds -f 'YYYYMMDD' $flags}}

+}

 9fs $dump

--- a/sys/man/1/history

+++ b/sys/man/1/history

@@ -9,8 +9,11 @@

 .B -fu

 ] [

 .B -d

-.I dumpfilesystem

+.I dumpfs

 ] [

+.B -t

+.I snaptag

+] [

 .B -s

 .I yyyymmdd

 ]

@@ -63,6 +66,13 @@

 .B -d

 option selects some other dump file system such as

 .IR /n/bootesdump .

+.PP

+The

+.B -t

+option selects some other snapshot tag within the file system.

+If not specified, it defaults to the

+.I main

+snapshot tag.

 .PP

 The

 .B -f

-- 

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