mirror of
https://github.com/notwa/rc
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47 lines
2.2 KiB
Bash
Executable file
47 lines
2.2 KiB
Bash
Executable file
#!/usr/bin/env sh
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# compat: -ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
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dedupe() ( ### @- copy a directory, but make hard/softlinks for identical files.
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# Copyright (C) 2022 Connor Olding
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h=0 usage='dedupe [OPTION...] {SOURCE} {TARGET} [FILE...]
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Copy files, recursively, from the source directory to the target directory,
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creating hard (or soft) links to any earlier file containing the same data.
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Optional file arguments allow for finer control of the order of files seen.
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--help display this help and exit
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--soft create soft links (default)
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--hard create hard links
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This software is provided WITHOUT WARRANTY under the terms of the ISC license.'
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read program <<'EOF'
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BEGIN{if(!D){exit 64}E=(Q="'")"\\"'\\""Q;H=(G=".")(F="/");I=" -- "Q;J="[^/]*/";\
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sub(F"?$",F,D)gsub(Q,E,D)}function C(x){if(X=system(x))exit X}{if((p=$2)==B)\
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{print V;exit 65}for(r=z=i=d=B;d!=!i;i++){b=a=p;d=sub("/.*",B,a);sub(J,B,p);\
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if(a==G G)e=!sub(J,B,z);else z=a==G?z:b!=a?z a F:z a;if(e||!i&&!a){print W;exit\
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65}}P=p=!z?H:z;if((o=O[$1])==p)next;gsub(Q,E,P);M=m=D P;gsub("/[^/]+$",B,M);\
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if(!u[M]++)C("mkdir -p"I M Q);if(o){T=split(o,t,F);S=split(p,s,F);for(i=1;t[i]\
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==s[i];i++);for(j=i;j<S;j++)r=r G H;for(j=i;j<T;j++)r=r t[j]F;r=h?o:r t[T];gsub\
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(Q,E,r);C("ln -f"(h?I D:" -s"I)r"' '"m Q);next}O[$1]=p;C("cp -p"I P"' '"m Q)}
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EOF
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die() { printf '\033[1mdedupe:\033[m %s\n' >&2 "$2"; exit "$1" ;}
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while o="${1#-}" && [ "${#o}" != "${#1}" ] && shift
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do case "$o" in
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(-) break ;;
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(-help) printf '\033[1mUsage:\033[m %s\n' "$usage"; exit ;;
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(-soft) h=0 ;; (-hard) h=1 ;;
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(-*) die 64 "unknown long option: -$o" ;;
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(*) die 64 "unknown short option: -${o%"${o#?}"}" ;;
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esac; done &&
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{ [ -d /tmp ] || die 72 "/tmp must be mounted" ;} &&
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{ [ $# -ge 2 ] || die 64 'expected at least 2 arguments' ;} &&
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unset CDPATH && D="$(readlink -f "$2")" && cd -- "$1" && shift 2 &&
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T="$(mktemp -d)" && t="$T/sums" && { [ $# -eq 0 ] || sha256sum >"$t" "$@" ;} &&
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find ! -type d ! -type s -exec sha256sum -- {} + >>"$t~" &&
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sort -k2 <"$t~" >>"$t" && awk -v D="$D" -v h="$h" -F' ' "$program" <"$t"; x=$?
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! [ -d "$t" ] || rm -r "$t" && [ $x = 0 ] || die $x 'exiting after failure'
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)
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[ -n "${preload+-}" ] || dedupe "$@"
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