alexk / rpms / rpm

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From 5f762af17c6e72e86e4710975dcdfd71fc5d1b07 Mon Sep 17 00:00:00 2001
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From: chantra <chantr4@gmail.com>
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Date: Tue, 8 Feb 2022 18:24:12 -0800
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Subject: [PATCH 19/30] [reflink] use `rpmpluginsCallFsmFileArchiveReader` to
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 provide custom rpmfi
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As the plugin can now be responsible to provide an Archive Reader to
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`rpmPackageFilesInstall`, we also don't need to mutate the
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`RPMTAG_PAYLOADFORMAT` header in memory, removing some special-casing.
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---
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 lib/depends.c     |  2 --
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 lib/fsm.c         | 38 +++++++++++++++++++-------------------
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 plugins/reflink.c | 18 +++++++++++++-----
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 3 files changed, 32 insertions(+), 26 deletions(-)
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diff --git a/lib/depends.c b/lib/depends.c
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index 8998afcd3..30234df3d 100644
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--- a/lib/depends.c
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+++ b/lib/depends.c
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@@ -81,8 +81,6 @@ static rpmRC headerCheckPayloadFormat(Header h) {
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      */
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     if (!payloadfmt) return rc;
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-    if (rstreq(payloadfmt, "clon")) return rc;
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-
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     if (!rstreq(payloadfmt, "cpio")) {
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         char *nevra = headerGetAsString(h, RPMTAG_NEVRA);
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         if (payloadfmt && rstreq(payloadfmt, "drpm")) {
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diff --git a/lib/fsm.c b/lib/fsm.c
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index 711f553d3..6972602e0 100644
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--- a/lib/fsm.c
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+++ b/lib/fsm.c
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@@ -19,7 +19,6 @@
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 #include "rpmio/rpmio_internal.h"	/* fdInit/FiniDigest */
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 #include "lib/fsm.h"
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-#include "lib/rpmlib.h"
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 #include "lib/rpmte_internal.h"	/* XXX rpmfs */
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 #include "lib/rpmplugins.h"	/* rpm plugins hooks */
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 #include "lib/rpmug.h"
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@@ -892,14 +891,6 @@ int rpmPackageFilesInstall(rpmts ts, rpmte te, rpmfiles files,
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     struct filedata_s *fdata = xcalloc(fc, sizeof(*fdata));
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     struct filedata_s *firstlink = NULL;
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-    Header h = rpmteHeader(te);
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-    const char *payloadfmt = headerGetString(h, RPMTAG_PAYLOADFORMAT);
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-    int cpio = 1;
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-
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-    if (payloadfmt && rstreq(payloadfmt, "clon")) {
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-	cpio = 0;
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-    }
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-
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     /* transaction id used for temporary path suffix while installing */
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     rasprintf(&tid, ";%08x", (unsigned)rpmtsGetTid(ts));
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@@ -933,14 +924,24 @@ int rpmPackageFilesInstall(rpmts ts, rpmte te, rpmfiles files,
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     if (rc)
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 	goto exit;
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-    if (cpio) {
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-	fi = rpmfiNewArchiveReader(payload, files, RPMFI_ITER_READ_ARCHIVE);
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-	if (fi == NULL) {
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-	    rc = RPMERR_BAD_MAGIC;
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-	    goto exit;
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-	}
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-    } else {
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-	fi = rpmfilesIter(files, RPMFI_ITER_FWD);
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+    rpmRC plugin_rc = rpmpluginsCallFsmFileArchiveReader(plugins, payload, files, &fi);
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+    switch(plugin_rc) {
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+	case RPMRC_PLUGIN_CONTENTS:
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+	    if(fi == NULL) {
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+		rc = RPMERR_BAD_MAGIC;
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+		goto exit;
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+	    }
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+	    rc = RPMRC_OK;
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+	    break;
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+	case RPMRC_OK:
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+	    fi = rpmfiNewArchiveReader(payload, files, RPMFI_ITER_READ_ARCHIVE);
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+	    if (fi == NULL) {
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+		rc = RPMERR_BAD_MAGIC;
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+		goto exit;
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+	    }
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+	    break;
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+	default:
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+	    rc = RPMRC_FAIL;
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     }
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     /* Detect and create directories not explicitly in package. */
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@@ -988,7 +989,7 @@ int rpmPackageFilesInstall(rpmts ts, rpmte te, rpmfiles files,
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 	    } else if (S_ISREG(fp->sb.st_mode)) {
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 		if (rc == RPMERR_ENOENT) {
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 		    rc = fsmMkfile(fi, fp, files, psm, nodigest,
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-			&firstlink, &firstlinkfile);
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+				   &firstlink, &firstlinkfile);
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 		}
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             } else if (S_ISDIR(fp->sb.st_mode)) {
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                 if (rc == RPMERR_ENOENT) {
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@@ -1096,7 +1097,6 @@ int rpmPackageFilesInstall(rpmts ts, rpmte te, rpmfiles files,
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     rpmswAdd(rpmtsOp(ts, RPMTS_OP_DIGEST), fdOp(payload, FDSTAT_DIGEST));
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 exit:
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-    h = headerFree(h);
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     fi = rpmfiFree(fi);
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     Fclose(payload);
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     free(tid);
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diff --git a/plugins/reflink.c b/plugins/reflink.c
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index 7dda06d8e..d5e6db27a 100644
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--- a/plugins/reflink.c
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+++ b/plugins/reflink.c
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@@ -54,6 +54,7 @@ struct reflink_state_s {
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     FD_t fd;
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     rpmfiles files;
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     inodeIndexHash inodeIndexes;
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+    int transcoded;
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 };
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 typedef struct reflink_state_s * reflink_state;
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@@ -116,12 +117,8 @@ static rpmRC reflink_psm_pre(rpmPlugin plugin, rpmte te) {
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 	    break;
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     }
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     rpmlog(RPMLOG_DEBUG, _("reflink: *is* transcoded\n"));
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-    Header h = rpmteHeader(te);
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+    state->transcoded = 1;
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-    /* replace/add header that main fsm.c can read */
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-    headerDel(h, RPMTAG_PAYLOADFORMAT);
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-    headerPutString(h, RPMTAG_PAYLOADFORMAT, "clon");
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-    headerFree(h);
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     state->files = rpmteFiles(te);
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     /* tail of file contains offset_table, offset_checksums then magic */
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     if (Fseek(state->fd, -(sizeof(rpm_loff_t) * 2 + sizeof(extents_magic_t)), SEEK_END) < 0) {
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@@ -350,10 +347,21 @@ static rpmRC reflink_fsm_file_install(rpmPlugin plugin, rpmfi fi, const char* pa
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     return RPMRC_OK;
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 }
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+static rpmRC reflink_fsm_file_archive_reader(rpmPlugin plugin, FD_t payload,
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+					     rpmfiles files, rpmfi *fi) {
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+    reflink_state state = rpmPluginGetData(plugin);
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+    if(state->transcoded) {
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+	*fi = rpmfilesIter(files, RPMFI_ITER_FWD);
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+	return RPMRC_PLUGIN_CONTENTS;
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+    }
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+    return RPMRC_OK;
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+}
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+
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 struct rpmPluginHooks_s reflink_hooks = {
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     .init = reflink_init,
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     .cleanup = reflink_cleanup,
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     .psm_pre = reflink_psm_pre,
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     .psm_post = reflink_psm_post,
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     .fsm_file_install = reflink_fsm_file_install,
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+    .fsm_file_archive_reader = reflink_fsm_file_archive_reader,
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 };
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-- 
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2.35.1
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